some work on x11 ext

.gitignore

@@ -3,10 +3,16 @@
 **/*.EXE
 **/*.exe
 **/*.out
+**/*.elf
+**/*.bin
 **/*.BAK
 **/*.wdl
+**/*.DX
 *.sublime-*
 
 Player/player
 Player/player.wasm
+Player/Cosmo
 Master/master
+
+Player/Out/Cosmo/player*

Common/Std/any.c

@@ -0,0 +1,138 @@
+/*
+  Generic std parts, building on top of platform specifics.
+*/
+
+#include "../fix.h"
+#include "../std.h"
+#include "../str.h"
+#include <stdarg.h>
+#include <stdint.h>
+
+static uint8_t com_std_any_format_u32(uint32_t v, char buf[10]) {
+  uint8_t c = 0;
+  if (v == 0) {
+    buf[10 - (++c)] = '0';
+  } else {
+    while (v > 0) {
+      buf[10 - (++c)] = '0' + (v % 10);
+      v /= 10;
+    }
+  }
+  return c;
+}
+
+static uint8_t com_std_any_format_i32(int32_t v, char buf[11]) {
+  bool neg = v < 0;
+  uint8_t c = 0;
+  if (v == 0) {
+    buf[11 - (++c)] = '0';
+  } else {
+    while (v > 0) {
+      buf[11 - (++c)] = '0' + (v % 10);
+      v /= 10;
+    }
+  }
+  if (neg)
+    buf[11 - (++c)] = '-';
+  return c;
+}
+
+/* Just assume 5 points of precision. */
+static uint8_t com_std_any_format_f64(double v, char buf[11 + 1 + 5]) {
+  bool neg = v < 0;
+  uint8_t c = 0;
+  double frac_part = v - (double)(int32_t)v;
+  for (int i = 0; i < 5; i++) {
+    frac_part *= 10.0;
+    uint8_t digit = (unsigned int)frac_part;
+    buf[17 - (++c)] = digit + '0';
+    frac_part -= digit;
+  }
+  buf[17 - (++c)] = '.';
+  c += com_std_any_format_i32((int32_t)v, &buf[c]);
+  return c;
+}
+
+/* We can make it buffered, but who cares, it's only for testing. */
+void com_std_print_(int32_t start, ...) {
+  va_list args;
+  va_start(args, start);
+
+  bool afterstring = false;
+  char type = start;
+  do {
+
+    /* Put space if not proceeding string. */
+    if (!afterstring && type != 'c')
+      com_std_write(COM_STD_OUTFD, " ", 1);
+
+    afterstring = false;
+
+    switch (type) {
+
+    /* uint32_t case. */
+    case 'u': {
+      uint32_t const v = va_arg(args, uint32_t);
+      char buf[10];
+      uint8_t c = com_std_any_format_u32(v, buf);
+      com_std_write(COM_STD_OUTFD, &buf[sizeof buf - c], c);
+      break;
+    }
+
+    /* null terminated string case. */
+    case 'c': {
+      char const *const v = va_arg(args, char *);
+      com_std_write(COM_STD_OUTFD, v, com_str_ext_len(v));
+      afterstring = true;
+      break;
+    }
+
+    /* TODO: FIX THIS */
+    /* com_fix case. */
+    case 'f': {
+      com_fix_t const v = va_arg(args, com_fix_t);
+      char buf[11];
+
+      int32_t const int_part = com_fix_int(v);
+      uint8_t c = com_std_any_format_i32(int_part, buf);
+      com_std_write(COM_STD_OUTFD, &buf[sizeof buf - c], c);
+
+      uint32_t const decimal_val = (com_fix_frac(v) * 10000) >> 16;
+      uint8_t cd = com_std_any_format_u32(decimal_val, buf);
+      buf[sizeof buf - (++cd)] = '.';
+      com_std_write(COM_STD_OUTFD, &buf[sizeof buf - cd], cd);
+
+      break;
+    }
+
+    /* double floating point case. */
+    case 'd': {
+      double const v = va_arg(args, double);
+      char buf[17];
+
+      uint8_t c = com_std_any_format_f64(v, buf);
+      com_std_write(COM_STD_OUTFD, &buf[sizeof buf - c], c);
+    }
+
+    /* End of things. */
+    case '.':
+      break;
+
+    default:
+      com_std_assert(false && "Unhandled format type");
+    }
+
+    type = va_arg(args, int32_t);
+
+  } while (type != '.');
+
+  com_std_write(COM_STD_OUTFD, "\n", 1);
+
+  va_end(args);
+}
+
+void com_std_print_str(char const *str, uint32_t len, bool newline) {
+  com_std_write(COM_STD_OUTFD, str, len);
+  if (newline)
+    com_std_write(COM_STD_OUTFD, "\n", 1);
+}

Common/Std/libc.c

@@ -1,7 +1,9 @@
 #include "../std.h"
-#include "../str.h"
+#include "any.c"
 #include <assert.h>
+#include <poll.h>
 #include <stdarg.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/socket.h>
@@ -11,19 +13,13 @@
 void *com_std_alloc(void *ptr, size_t size) {
   return size != 0 ? realloc(ptr, size) : (free(ptr), NULL);
 }
-void com_std_assert(bool holds) { assert(holds); }
-void com_std_printf(char const *fmt, ...) {
-  va_list args;
-  va_start(args, fmt);
-  vprintf(fmt, args);
-  va_end(args);
-}
+
 double com_std_sqrt(double v) { return sqrt(v); }
 double com_std_fabs(double v) { return fabs(v); }
 double com_std_sin(double v) { return sin(v); }
 double com_std_cos(double v) { return cos(v); }
 
-com_std_fd com_std_open(char *path, uint32_t flags) {
+com_std_fd com_std_open(char const *path, uint32_t flags) {
   com_std_assert(flags != 0);
   char *mode = flags & COM_STD_OPEN_READ && flags & COM_STD_OPEN_WRITE ? "r+"
                : flags & COM_STD_OPEN_READ                             ? "r"
@@ -31,18 +27,27 @@ com_std_fd com_std_open(char *path, uint32_t flags) {
   return fopen(path, mode);
 }
 
-bool com_std_write(com_std_fd fd, char *data, uint32_t bytes) {
-  com_std_assert(fd != NULL && data != NULL && bytes != 0);
+bool com_std_write(com_std_fd fd, void const *data, uint32_t bytes) {
+  com_std_assert(data != NULL && bytes != 0);
   bool s = fwrite(data, 1, bytes, fd) == bytes;
   fflush(fd);
   return s;
 }
 
-int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto) {
-  com_std_assert(fd != NULL && data != NULL && upto != 0);
+int32_t com_std_read(com_std_fd fd, void *data, uint32_t upto) {
+  com_std_assert(data != NULL && upto != 0);
   return fread(data, 1, upto, fd);
 }
 
+bool com_std_has_data(com_std_fd fd) {
+  struct pollfd pfd = {.fd = (intptr_t)fd, .events = POLLIN};
+  int ret = poll(&pfd, 1, 0);
+  if (ret > 0) {
+    return pfd.revents & POLLIN;
+  } else
+    return false;
+}
+
 bool com_std_sfwd(com_std_fd fd, uint32_t bytes) {
   com_std_assert(fd != NULL && bytes != 0);
   return fseek(fd, bytes, SEEK_CUR) == 0;
@@ -56,7 +61,7 @@ com_std_fd com_std_socket(bool isnetwork) {
     return NULL;
 }
 
-bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
+bool com_std_connect(com_std_fd fd, bool isnetwork, char const *address) {
   com_std_assert(address != NULL);
   if (!isnetwork) {
     struct sockaddr_un addr = {.sun_family = AF_UNIX};
@@ -66,6 +71,6 @@ bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
     return NULL;
 }
 
-void com_std_exit(uint32_t status) { exit(status); }
+void com_std_exit(int32_t status) { exit(status); }
 
 void com_std_close(com_std_fd fd) { fclose(fd); }

Common/Std/linux-amd64.c

@@ -6,11 +6,12 @@
 
 #include "../std.h"
 #include <fcntl.h>
+#include <poll.h>
 #include <stdint.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 
-inline com_std_fd com_std_open(char *path, uint32_t flags) {
+inline com_std_fd com_std_open(char const *path, uint32_t flags) {
   com_std_assert(flags != 0);
   uint32_t mode = flags & COM_STD_OPEN_READ && flags & COM_STD_OPEN_WRITE
                       ? O_RDWR
@@ -26,7 +27,7 @@ inline com_std_fd com_std_open(char *path, uint32_t flags) {
   return (void *)ret;
 }
 
-inline bool com_std_write(com_std_fd fd, char const *data, uint32_t bytes) {
+inline bool com_std_write(com_std_fd fd, void const *data, uint32_t bytes) {
   long ret;
   __asm__ volatile("syscall"
                    : "=a"(ret)
@@ -35,7 +36,7 @@ inline bool com_std_write(com_std_fd fd, char const *data, uint32_t bytes) {
   return ret == bytes;
 }
 
-inline int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto) {
+inline int32_t com_std_read(com_std_fd fd, void *data, uint32_t upto) {
   long ret;
   __asm__ volatile("syscall"
                    : "=a"(ret)
@@ -44,6 +45,23 @@ inline int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto) {
   return ret;
 }
 
+inline bool com_std_has_data(com_std_fd fd) {
+  struct pollfd pfd = {
+      .fd = (intptr_t)fd,
+      .events = POLLIN,
+  };
+
+  long ret;
+  __asm__ volatile("syscall"
+                   : "=a"(ret)
+                   : "a"(7), "D"(&pfd), "S"(1), "d"(0)
+                   : "rcx", "r11", "memory");
+  if (ret > 0) {
+    return pfd.revents & POLLIN;
+  } else
+    return false;
+}
+
 inline bool com_std_sfwd(com_std_fd fd, uint32_t bytes) {
   long ret;
   __asm__ volatile("syscall"
@@ -67,7 +85,8 @@ inline com_std_fd com_std_socket(bool isnetwork) {
     return NULL;
 }
 
-inline bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
+inline bool com_std_connect(com_std_fd fd, bool isnetwork,
+                            char const *address) {
   com_std_assert(address != NULL);
   if (!isnetwork) {
     struct sockaddr_un addr = {.sun_family = AF_UNIX};
@@ -82,7 +101,7 @@ inline bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
     return NULL;
 }
 
-inline void com_std_exit(uint32_t status) {
+inline void com_std_exit(int32_t status) {
   __asm__ volatile("syscall" : : "a"(60), "D"(status) : "rcx", "r11", "memory");
   __builtin_unreachable();
 }

Common/Std/linux-x86.c

@@ -6,11 +6,12 @@
 
 #include "../std.h"
 #include <fcntl.h>
+#include <poll.h>
 #include <stdint.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 
-inline com_std_fd com_std_open(char *path, uint32_t flags) {
+inline com_std_fd com_std_open(char const *path, uint32_t flags) {
   com_std_assert(flags != 0);
   uint32_t mode = flags & COM_STD_OPEN_READ && flags & COM_STD_OPEN_WRITE
                       ? O_RDWR
@@ -26,7 +27,7 @@ inline com_std_fd com_std_open(char *path, uint32_t flags) {
   return (void *)ret;
 }
 
-inline bool com_std_write(com_std_fd fd, char const *data, uint32_t bytes) {
+inline bool com_std_write(com_std_fd fd, void const *data, uint32_t bytes) {
   long ret;
   __asm__ volatile("int $0x80"
                    : "=a"(ret)
@@ -35,7 +36,7 @@ inline bool com_std_write(com_std_fd fd, char const *data, uint32_t bytes) {
   return ret == bytes;
 }
 
-inline int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto) {
+inline int32_t com_std_read(com_std_fd fd, void *data, uint32_t upto) {
   long ret;
   __asm__ volatile("int $0x80"
                    : "=a"(ret)
@@ -44,6 +45,23 @@ inline int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto) {
   return ret;
 }
 
+inline bool com_std_has_data(com_std_fd fd) {
+  struct pollfd pfd = {
+      .fd = (intptr_t)fd,
+      .events = POLLIN,
+  };
+
+  long ret;
+  __asm__ volatile("int $0x80"
+                   : "=a"(ret)
+                   : "a"(168), "b"(&pfd), "c"(1), "d"(0)
+                   : "memory", "cc");
+  if (ret > 0) {
+    return pfd.revents & POLLIN;
+  } else
+    return false;
+}
+
 inline bool com_std_sfwd(com_std_fd fd, uint32_t bytes) {
   long ret;
   __asm__ volatile("int $0x80"
@@ -67,7 +85,8 @@ inline com_std_fd com_std_socket(bool isnetwork) {
     return NULL;
 }
 
-inline bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
+inline bool com_std_connect(com_std_fd fd, bool isnetwork,
+                            char const *address) {
   com_std_assert(address != NULL);
   if (!isnetwork) {
     struct sockaddr_un addr = {.sun_family = AF_UNIX};
@@ -82,7 +101,7 @@ inline bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
     return NULL;
 }
 
-inline void com_std_exit(uint32_t status) {
+inline void com_std_exit(int32_t status) {
   __asm__ volatile("int $0x80" : : "a"(1), "b"(status) : "memory", "cc");
   __builtin_unreachable();
 }

Common/Std/linux.c

@@ -2,41 +2,15 @@
   Generic linux std parts.
 */
 
-#include "../def.h"
+#include "any.c"
+#include "nolibc.c"
+
 #include "../std.h"
-#include "../str.h"
-#include <stdarg.h>
 #include <stdint.h>
 
 void *com_std_alloc(void *ptr, size_t size) { return NULL; }
-void com_std_assert(bool holds) {
-  /* TODO: Write line info to stderr as well. */
-  if (!holds)
-    com_std_exit(-1);
-}
-
-/* TODO: Figure out a way to make it easy to deal with. */
-void com_std_printf(char const *fmt, ...) {
-  com_std_write((void *)1, fmt, com_str_ext_len(fmt));
-}
-
-void com_std_print_str(char const *str, uint32_t len, bool newline) {
-  com_std_write((void *)1, str, len);
-  if (newline)
-    com_std_write((void *)1, "\n", 1);
-}
 
 double com_std_sqrt(double v) { return __builtin_sqrt(v); }
 double com_std_fabs(double v) { return __builtin_fabs(v); }
-#if COM_DEF_COMPILER == COM_DEF_COMPILER_CLANG
 double com_std_sin(double v) { return __builtin_sin(v); }
 double com_std_cos(double v) { return __builtin_cos(v); }
-#else
-/* TODO: Use fsin/fcos, no matter how slow. */
-double com_std_sin(double v) { return 0; }
-double com_std_cos(double v) { return 0; }
-#endif
-
-// void memcpy(void *__restrict dest, const void *__restrict src, size_t n) {
-//   __builtin_memcpy(dest, src, n);
-// };

Common/Std/nolibc.c

@@ -0,0 +1,51 @@
+/*
+  Generic no libc std parts.
+*/
+
+#include <stddef.h>
+
+/* Compiler depends on them with low optimization level. */
+void *memcpy(void *__restrict dest, const void *__restrict src, size_t n) {
+  for (size_t i = 0; i < n; ++i)
+    ((char *)dest)[i] = ((char *)src)[i];
+  return dest;
+};
+
+void *memset(void *__restrict dest, int s, size_t n) {
+  for (size_t i = 0; i < n; ++i)
+    ((char *)dest)[i] = s;
+  return dest;
+};
+
+size_t strlen(char const *s) {
+  char const *p = s;
+  for (; *p != 0; ++p) {
+  }
+  return p - s;
+}
+
+double sin(double v) {
+  double r;
+  __asm__ __volatile__("fsin" : "=t"(r) : "0"(v));
+
+  return r;
+}
+
+double cos(double v) {
+  double r;
+  __asm__ __volatile__("fcos" : "=t"(r) : "0"(v));
+  return r;
+}
+
+void sincos(double v, double *s, double *c) {
+  double sv, cv;
+  __asm__ __volatile__("fsincos" : "=t"(cv), "=u"(sv) : "0"(v));
+  *s = sv;
+  *c = cv;
+}
+
+double sqrt(double v) {
+  double r;
+  __asm__ volatile("sqrtss %1, %0" : "=x"(r) : "x"(v));
+  return r;
+}

Common/Std/stub.c

@@ -1,11 +1,11 @@
 #include "../std.h"
 
+#include "any.c"
+
 #include <stdbool.h>
 #include <stddef.h>
 
 void *com_std_alloc(void *ptr, size_t size) { return NULL; }
-void com_std_assert(bool holds) {}
-void com_std_printf(char const *fmt, ...) {}
 
 double com_std_sqrt(double v) { return __builtin_sqrt(v); }
 double com_std_fabs(double v) { return __builtin_fabs(v); }
@@ -18,14 +18,14 @@ double com_std_sin(double v) { return 0; }
 double com_std_cos(double v) { return 0; }
 #endif
 
-com_std_fd com_std_open(char *path, uint32_t flags) { return NULL; }
-bool com_std_write(com_std_fd fd, char const *data, uint32_t bytes) {
+com_std_fd com_std_open(char const *path, uint32_t flags) { return NULL; }
+bool com_std_write(com_std_fd fd, void const *data, uint32_t bytes) {
   return false;
 }
-int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto) { return -1; }
+int32_t com_std_read(com_std_fd fd, void *data, uint32_t upto) { return -1; }
 bool com_std_sfwd(com_std_fd fd, uint32_t bytes) { return false; }
 com_std_fd com_std_socket(bool isnetwork) { return NULL; }
-bool com_std_connect(com_std_fd fd, bool isnetwork, char *address) {
+bool com_std_connect(com_std_fd fd, bool isnetwork, char const *address) {
   return false;
 }
 void com_std_exit(uint32_t status) {
@@ -35,7 +35,3 @@ void com_std_exit(uint32_t status) {
   __builtin_unreachable();
 }
 void com_std_close(com_std_fd fd) { return; }
-
-// void memcpy(void *__restrict dest, const void *__restrict src, size_t n) {
-//   __builtin_memcpy(dest, src, n);
-// };

Common/Timer/posix.c

@@ -13,5 +13,6 @@ uint64_t com_timer_count_ns(void) {
 void com_timer_profile(uint64_t starttime, const char *what) {
   uint64_t const endtime = com_timer_count_ns();
   uint64_t const diff = endtime - starttime;
-  com_std_printf("profile \"%s\" took %fms\n", what, (double)diff / 1000000);
+  com_std_print('c', "Profile ", 'c', what, 'c', " took ", 'd',
+                (double)diff / 1000000, 'c', "ms");
 }

Common/buf.h

@@ -37,7 +37,7 @@ typedef struct com_buf {
   struct com_buf *p_v = (struct com_buf *)&p_v##_buf;                          \
   p_v->cap = (p_c);                                                            \
   p_v->flags = p_f | COM_BUF_STACK;                                            \
-  p_v->typesz = sizeof(p_t);
+  p_v->typesz = sizeof(p_t)
 
 #define com_buf_index_as(p_t, p_v, p_i)                                        \
   (p_t *)(&(p_v)->data[sizeof(p_t) * (p_i)])

Common/cfg.h

@@ -2,6 +2,8 @@
     Configuration file.
 */
 
+/* TODO: Move to root or Shared/ folder? */
+
 #ifndef COM_CFG_H
 #define COM_CFG_H
 
@@ -9,4 +11,12 @@
 #define COM_CFG_WIDTH 640
 #define COM_CFG_HEIGHT 480
 
+#if COM_DEF_TARGET == COM_DEF_TARGET_WASM
+#define COM_CFG_COLORS 4
+#else
+#define COM_CFG_COLORS 3
+#endif
+
+#define COM_CFG_FBSIZE (COM_CFG_WIDTH * COM_CFG_HEIGHT * COM_CFG_COLORS)
+
 #endif

Common/def.h

@@ -6,6 +6,9 @@
 #ifndef COM_DEF_H
 #define COM_DEF_H
 
+#define COM_DEF_STRLIT_(x) #x
+#define COM_DEF_STRLIT(x) COM_DEF_STRLIT_(x)
+
 #define COM_DEF_COMPILER_CLANG 1
 #define COM_DEF_COMPILER_GCC 2
 
@@ -17,6 +20,7 @@
 
 #define COM_DEF_TARGET_LINUX 1
 #define COM_DEF_TARGET_WASM 2
+#define COM_DEF_TARGET_COSMO 3
 
 #if defined(__wasm__)
 #define COM_DEF_TARGET COM_DEF_TARGET_WASM
@@ -24,6 +28,9 @@
 #elif defined(__linux__)
 #define COM_DEF_TARGET COM_DEF_TARGET_LINUX
 #define com_def_export_sym(m_s) __attribute__((visibility("default")))
+#elif defined(__COSMOPOLITAN__)
+#define COM_DEF_TARGET COM_DEF_TARGET_COSMO
+#define com_def_export_sym(m_s) __attribute__((visibility("default")))
 #else
 #error Unknown target.
 #endif
@@ -31,6 +38,7 @@
 #define COM_DEF_CPU_AMD64 1
 #define COM_DEF_CPU_X86 2
 #define COM_DEF_CPU_WASM32 3
+#define COM_DEF_CPU_AARCH64 4
 
 #if defined(__wasm__)
 #define COM_DEF_CPU COM_DEF_CPU_WASM32
@@ -44,6 +52,10 @@
 #define COM_DEF_CPU COM_DEF_CPU_X86
 #define COM_DEF_ALIGNMENT 16
 #define COM_DEF_CPU_LITEND 1
+#elif defined(__aarch64__)
+#define COM_DEF_CPU COM_DEF_CPU_AARCH64
+#define COM_DEF_ALIGNMENT 16
+#define COM_DEF_CPU_LITEND 1
 #else
 #error Unknown cpu.
 #endif

Common/fix.c

@@ -71,20 +71,6 @@ com_fix_t com_fix_sqrt(com_fix_t a) {
                          : (int32_t)(x >> (-final_shift));
 }
 
-void com_fix_print(com_fix_t a) {
-  if (a < 0) {
-    com_std_printf("-");
-    a = -a;
-  }
-  int32_t int_part = a >> 16;
-  int32_t frac_part = a & 0xFFFF;
-
-  // Convert fractional 16-bit part to a decimal value (up to 4 decimal places)
-  uint32_t decimal_val = (frac_part * 10000) >> 16;
-
-  com_std_printf("%d.%04u\n", int_part, decimal_val);
-}
-
 void com_fix_run_bench(void) {
   uint64_t start = com_timer_count_ns();
   for (int i = 5000000; i--;) {
@@ -118,77 +104,3 @@ void com_fix_run_bench(void) {
   }
   com_timer_profile(start, "fixed: sincos");
 }
-
-void com_fix_run_tests(void) {
-  {
-    double max_sqrt_deviation = 0.0f;
-    com_fix_t sqrt_accumulator = 0;
-    com_fix_t sqrt_test_step = COM_FIX_FRACUNIT >> 2; /* Quarter step */
-    for (int i = 0; i < COM_FIX_FRACUNIT << 1; ++i) {
-      com_fix_t sqrt = com_fix_sqrt(sqrt_accumulator);
-      double const deviation =
-          com_std_sqrt(com_fix_as_float(sqrt_accumulator)) -
-          com_fix_as_float(sqrt);
-      if (deviation > max_sqrt_deviation)
-        max_sqrt_deviation = deviation;
-      sqrt_accumulator += sqrt_test_step;
-    }
-    com_std_printf("max sqrt deviation: %f\n", max_sqrt_deviation);
-  }
-
-  {
-    double max_sin_deviation = 0.0f;
-    com_fix_t sin_accumulator = -COM_FIX_PI * 4;
-    com_fix_t sin_test_step = (COM_FIX_PI << 1) >> 10;
-    for (int i = 0; i < 1024 * 32; ++i) {
-      com_fix_t sin = com_fix_sin(sin_accumulator);
-      double const deviation =
-          com_std_fabs(com_std_sin(com_fix_as_float(sin_accumulator)) -
-                       com_fix_as_float(sin));
-      if (deviation > max_sin_deviation)
-        max_sin_deviation = deviation;
-      sin_accumulator += sin_test_step;
-    }
-    com_std_printf("max sin deviation: %f\n", max_sin_deviation);
-  }
-
-  {
-    double max_cos_deviation = 0.0f;
-    com_fix_t cos_accumulator = -COM_FIX_PI * 4;
-    com_fix_t cos_test_step = (COM_FIX_PI << 1) >> 10;
-    for (int i = 0; i < 1024 * 32; ++i) {
-      com_fix_t cos = com_fix_cos(cos_accumulator);
-      double const deviation =
-          com_std_fabs(com_std_cos(com_fix_as_float(cos_accumulator)) -
-                       com_fix_as_float(cos));
-      if (deviation > max_cos_deviation)
-        max_cos_deviation = deviation;
-      cos_accumulator += cos_test_step;
-    }
-    com_std_printf("max cos deviation: %f\n", max_cos_deviation);
-  }
-
-  {
-    double max_sin_deviation = 0.0f;
-    double max_cos_deviation = 0.0f;
-    com_fix_t sincos_accumulator = -COM_FIX_PI * 4;
-    com_fix_t sincos_test_step = (COM_FIX_PI << 1) >> 10;
-    for (int i = 0; i < 1024 * 32; ++i) {
-      com_fix_t sin, cos;
-      com_fix_sincos(sincos_accumulator, &sin, &cos);
-      double const sin_deviation =
-          com_std_fabs(com_std_sin(com_fix_as_float(sincos_accumulator)) -
-                       com_fix_as_float(sin));
-      double const cos_deviation =
-          com_std_fabs(com_std_cos(com_fix_as_float(sincos_accumulator)) -
-                       com_fix_as_float(cos));
-      if (sin_deviation > max_sin_deviation)
-        max_sin_deviation = sin_deviation;
-      if (cos_deviation > max_cos_deviation)
-        max_cos_deviation = cos_deviation;
-      sincos_accumulator += sincos_test_step;
-    }
-    com_std_printf("max sincos deviations: %f %f\n", max_sin_deviation,
-                   max_cos_deviation);
-  }
-}

Common/fix.h

@@ -23,8 +23,6 @@ typedef int32_t com_fix_t;
 
 extern const uint16_t com_fix_sin_lut[128];
 
-void com_fix_print(com_fix_t a);
-
 void com_fix_run_tests(void);
 void com_fix_run_bench(void);
 
@@ -32,9 +30,9 @@ static inline com_fix_t com_fix_add(com_fix_t a, com_fix_t b) { return a + b; }
 
 static inline com_fix_t com_fix_sub(com_fix_t a, com_fix_t b) { return a - b; }
 
-static inline com_fix_t com_fix_int(com_fix_t a) {
-  return a >> COM_FIX_FRACBITS;
-}
+static inline int16_t com_fix_int(com_fix_t a) { return a >> COM_FIX_FRACBITS; }
+
+static inline uint16_t com_fix_frac(com_fix_t a) { return a & 0xFFFF; }
 
 static inline com_fix_t com_fix_mul(com_fix_t a, com_fix_t b) {
   return (com_fix_t)(((int64_t)a * (int64_t)b) >> COM_FIX_FRACBITS);

Common/gem.h

@@ -57,12 +57,7 @@ static inline uint8_t com_gem_clip_vis_project(com_vec_t a, com_pnt_t *out) {
     mask ^= COM_GEM_VERTEX_CLIPPED_X;
   if (a.a[1] < -a.a[2] || a.a[1] > a.a[2])
     mask ^= COM_GEM_VERTEX_CLIPPED_Y;
-  // out->a[0] = com_fix_mul((com_fix_div(a.a[0], a.a[2]) + COM_FIX_FRACUNIT) >>
-  // 1,
-  //                         COM_CFG_WIDTH * COM_FIX_FRACUNIT);
-  // out->a[1] = com_fix_mul((com_fix_div(a.a[1], a.a[2]) + COM_FIX_FRACUNIT) >>
-  // 1,
-  //                         COM_CFG_HEIGHT * COM_FIX_FRACUNIT);
+
   out->a[0] = (com_fix_mul(com_fix_div(a.a[0], a.a[2]),
                            COM_CFG_WIDTH * COM_FIX_FRACUNIT) >>
                COM_FIX_FRACBITS) +
@@ -71,6 +66,7 @@ static inline uint8_t com_gem_clip_vis_project(com_vec_t a, com_pnt_t *out) {
                            COM_CFG_HEIGHT * COM_FIX_FRACUNIT) >>
                COM_FIX_FRACBITS) +
               (COM_CFG_HEIGHT / 2);
+
   return mask;
 }
 
@@ -91,9 +87,9 @@ static inline void com_gem_draw_triangle(com_pnt_t v0, com_pnt_t v1,
       // If the point is inside or on all edges, draw the pixel
       // (Assumes Counter Clockwise vertex ordering)
       if (ws.a[0] >= 0 && ws.a[1] >= 0 && ws.a[2] >= 0) {
-        out[(y * COM_CFG_WIDTH + x) * 4 + 0] = 125;
-        out[(y * COM_CFG_WIDTH + x) * 4 + 1] = 125;
-        out[(y * COM_CFG_WIDTH + x) * 4 + 2] = 125;
+        out[(y * COM_CFG_WIDTH + x) * COM_CFG_COLORS + 0] = 125;
+        out[(y * COM_CFG_WIDTH + x) * COM_CFG_COLORS + 1] = 125;
+        out[(y * COM_CFG_WIDTH + x) * COM_CFG_COLORS + 2] = 125;
       }
     }
   }
@@ -147,9 +143,9 @@ com_gem_draw_triangle_textured_edge(com_pnt_t v0, com_pnt_t v1, com_pnt_t v2,
         // uint32_t bidx = com_zord_order(x, y);
         uint32_t bidx = y * COM_CFG_WIDTH + x;
 
-        out[bidx * 4 + 0] = tex[idx * 3 + 0];
-        out[bidx * 4 + 1] = tex[idx * 3 + 1];
-        out[bidx * 4 + 2] = tex[idx * 3 + 2];
+        out[bidx * COM_CFG_COLORS + 0] = tex[idx * 3 + 0];
+        out[bidx * COM_CFG_COLORS + 1] = tex[idx * 3 + 1];
+        out[bidx * COM_CFG_COLORS + 2] = tex[idx * 3 + 2];
       }
     }
   }
@@ -170,9 +166,9 @@ static inline void draw_span(int32_t x_start_fp, int32_t x_end_fp, int y,
   for (int x = x1; x < x2; x++) {
     uint32_t idx = 0 * 32 + 0;
     uint32_t bidx = y * COM_CFG_WIDTH + x;
-    out[bidx * 4 + 0] = tex[idx * 3 + 0];
-    out[bidx * 4 + 1] = tex[idx * 3 + 1];
-    out[bidx * 4 + 2] = tex[idx * 3 + 2];
+    out[bidx * COM_CFG_COLORS + 0] = tex[idx * 3 + 0];
+    out[bidx * COM_CFG_COLORS + 1] = tex[idx * 3 + 1];
+    out[bidx * COM_CFG_COLORS + 2] = tex[idx * 3 + 2];
   }
 }
 

Common/pnt.h

@@ -111,9 +111,4 @@ com_pnt_edge_weight_calc_precomp(com_pnt_t v0, com_pnt_t v1, com_pnt_t v2,
                                precomp[2].a[1] * (p.a[0] - v0.a[0])}};
 }
 
-static inline void com_pnt_print(com_pnt_t a) {
-  com_fix_print(a.a[0]);
-  com_fix_print(a.a[1]);
-}
-
 #endif

Common/std.h

@@ -10,17 +10,29 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#if COM_DEF_TARGET != COM_DEF_TARGET_COSMO
+#define COM_STD_INFD (void *)0
+#define COM_STD_OUTFD (void *)1
+#else
+/* TODO: Make it more graceful, probably with static func. */
+#include <unistd.h>
+#define COM_STD_INFD (fdopen(STDIN_FILENO, "r"))
+#define COM_STD_OUTFD (fdopen(STDOUT_FILENO, "w"))
+#endif
+
 /* Generic system interface, linux/bsd derived. */
 typedef void *com_std_fd;
 #define COM_STD_OPEN_READ (1 << 0)
 #define COM_STD_OPEN_WRITE (1 << 1)
-com_std_fd com_std_open(char *path, uint32_t flags);
-bool com_std_write(com_std_fd fd, char const *data, uint32_t bytes);
-int32_t com_std_read(com_std_fd fd, char *data, uint32_t upto);
+com_std_fd com_std_open(char const *path, uint32_t flags);
+bool com_std_write(com_std_fd fd, void const *data, uint32_t bytes);
+/* TODO: Return unit32_t, error on ZERO? Separate EOF check? */
+int32_t com_std_read(com_std_fd fd, void *data, uint32_t upto);
+bool com_std_has_data(com_std_fd);
 bool com_std_sfwd(com_std_fd fd, uint32_t bytes);
 com_std_fd com_std_socket(bool isnetwork);
-bool com_std_connect(com_std_fd sock, bool isnetwork, char *address);
-void com_std_exit(uint32_t status) __attribute__((noreturn));
+bool com_std_connect(com_std_fd sock, bool isnetwork, char const *address);
+void com_std_exit(int32_t status) __attribute__((noreturn));
 void com_std_close(com_std_fd fd);
 
 /* TODO: Remove, use buffer semantics instead. */
@@ -31,9 +43,44 @@ void *com_std_alloc(void *ptr, size_t size);
 /* Note: Functions listed below are only available for dev builds. */
 /* Trigonometry functions are for reference testing of our own fixed point
  * implementations. Do not use otherwise. */
-void com_std_assert(bool holds);
-void com_std_printf(char const *fmt, ...);
+#define com_std_assert(p_h)                                                    \
+  do {                                                                         \
+    if (!(p_h)) {                                                              \
+      const char msg[] =                                                       \
+          "Assertion failed at "__FILE__                                       \
+          ":" COM_DEF_STRLIT(__LINE__) ": " COM_DEF_STRLIT(p_h);               \
+      com_std_print_str(msg, sizeof msg, true);                                \
+      com_std_exit(-1);                                                        \
+    }                                                                          \
+  } while (0)
+
+/*
+    Basic printing utility that doesn't utilize format string.
+    Instead a vector of arguments is passed and concatenated, based on type.
+    Newline is implied at the end.
+
+    Example: com_std_print("My unit32_t: ", 'u', value, 's', " is here");
+
+    Format specifiers:
+    'u' = uint32_t
+    'i' = int32_t
+    'd' = float (upcast to double with vargs)
+    'c' = null terminated C string
+
+    Our own types:
+    'f' = com_fix value
+    'p' = com_pnt pointer
+    'v' = com_vec pointer
+    's' = pointer to com_str structure
+    'b' = pointer to com_buf structure
+
+    '.' is placed at the end implicitly with macro,
+        it is needed to know when to end.
+*/
+void com_std_print_(int32_t start, ...);
+#define com_std_print(...) com_std_print_(__VA_ARGS__, '.')
 void com_std_print_str(char const *str, uint32_t len, bool newline);
+
 double com_std_sqrt(double v);
 double com_std_fabs(double v);
 double com_std_sin(double v);

Common/str.h

@@ -47,9 +47,9 @@ static inline int32_t com_str_ext_find_char(char const *s, char ch) {
 
 /* Returns true if string 'a' is prefixed by 'b'. */
 static inline bool com_str_ext_prefixed(char const *__restrict a,
-                                        struct com_str prefix) {
-  uint32_t n = prefix.len;
-  char *b = prefix.data;
+                                        struct com_str const *prefix) {
+  uint32_t n = prefix->len;
+  char *b = prefix->data;
   while (n && *a && (*a == *b)) {
     ++a;
     ++b;

Common/test.h

@@ -0,0 +1,146 @@
+/*
+    Centralized test suite.
+*/
+
+#include "bits.h"
+#include "fix.h"
+#include "mat.h"
+#include "std.h"
+#include <stdbool.h>
+
+#define TEST(p_e)                                                              \
+  do {                                                                         \
+    if (!(p_e)) {                                                              \
+      com_std_print('c', COM_DEF_STRLIT(p_e) " failed!");                      \
+      anyfail = true;                                                          \
+    }                                                                          \
+  } while (0)
+
+static bool com_test_fix(void) {
+  bool anyfail = false;
+  {
+    double max_sqrt_deviation = 0.0;
+    com_fix_t sqrt_accumulator = 0;
+    com_fix_t sqrt_test_step = COM_FIX_FRACUNIT >> 2; /* Quarter step */
+    for (int i = 0; i < COM_FIX_FRACUNIT << 1; ++i) {
+      com_fix_t sqrt = com_fix_sqrt(sqrt_accumulator);
+      double const deviation =
+          com_std_sqrt(com_fix_as_float(sqrt_accumulator)) -
+          com_fix_as_float(sqrt);
+      if (deviation > max_sqrt_deviation)
+        max_sqrt_deviation = deviation;
+      sqrt_accumulator += sqrt_test_step;
+    }
+    com_std_print('c', "Max sqrt deviation: ", 'd', max_sqrt_deviation);
+  }
+
+  {
+    double max_sin_deviation = 0.0;
+    com_fix_t sin_accumulator = -COM_FIX_PI * 4;
+    com_fix_t sin_test_step = (COM_FIX_PI << 1) >> 10;
+    for (int i = 0; i < 1024 * 32; ++i) {
+      com_fix_t sin = com_fix_sin(sin_accumulator);
+      double const deviation =
+          com_std_fabs(com_std_sin(com_fix_as_float(sin_accumulator)) -
+                       com_fix_as_float(sin));
+      if (deviation > max_sin_deviation)
+        max_sin_deviation = deviation;
+      sin_accumulator += sin_test_step;
+    }
+    com_std_print('c', "Max sin deviation: ", 'd', max_sin_deviation);
+  }
+
+  {
+    double max_cos_deviation = 0.0;
+    com_fix_t cos_accumulator = -COM_FIX_PI * 4;
+    com_fix_t cos_test_step = (COM_FIX_PI << 1) >> 10;
+    for (int i = 0; i < 1024 * 32; ++i) {
+      com_fix_t cos = com_fix_cos(cos_accumulator);
+      double const deviation =
+          com_std_fabs(com_std_cos(com_fix_as_float(cos_accumulator)) -
+                       com_fix_as_float(cos));
+      if (deviation > max_cos_deviation)
+        max_cos_deviation = deviation;
+      cos_accumulator += cos_test_step;
+    }
+    com_std_print('c', "Max cos deviation: ", 'd', max_cos_deviation);
+  }
+
+  {
+    double max_sin_deviation = 0.0;
+    double max_cos_deviation = 0.0;
+    com_fix_t sincos_accumulator = -COM_FIX_PI * 4;
+    com_fix_t sincos_test_step = (COM_FIX_PI << 1) >> 10;
+    for (int i = 0; i < 1024 * 32; ++i) {
+      com_fix_t sin, cos;
+      com_fix_sincos(sincos_accumulator, &sin, &cos);
+      double const sin_deviation =
+          com_std_fabs(com_std_sin(com_fix_as_float(sincos_accumulator)) -
+                       com_fix_as_float(sin));
+      double const cos_deviation =
+          com_std_fabs(com_std_cos(com_fix_as_float(sincos_accumulator)) -
+                       com_fix_as_float(cos));
+      if (sin_deviation > max_sin_deviation)
+        max_sin_deviation = sin_deviation;
+      if (cos_deviation > max_cos_deviation)
+        max_cos_deviation = cos_deviation;
+      sincos_accumulator += sincos_test_step;
+    }
+    com_std_print('c', "Max sincos deviations: ", 'd', max_sin_deviation, 'd',
+                  max_cos_deviation);
+  }
+
+  return anyfail;
+}
+
+static bool com_test_bits(void) {
+  bool anyfail = false;
+
+  TEST(com_bits_nalign(0, 4) == 0);
+  TEST(com_bits_nalign(1, 4) == 4);
+  TEST(com_bits_nalign(2, 4) == 4);
+  TEST(com_bits_nalign(3, 4) == 4);
+  TEST(com_bits_nalign(4, 4) == 4);
+  TEST(com_bits_nalign(5, 4) == 8);
+
+  return anyfail;
+}
+
+static bool com_test_mat(void) {
+  bool anyfail = false;
+
+  com_mat_t const m0 = com_mat_identity();
+  com_mat_t m1 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
+  for (int i = 0; i < 16; ++i)
+    m1.a[i] *= COM_FIX_FRACUNIT;
+
+  com_mat_t const mul = com_mat_mul(m1, m0);
+  com_mat_t const mul_reordered = com_mat_mul_reodered(com_mat_reoder(m1), m0);
+
+  for (int i = 0; i < 16; ++i) {
+    TEST(mul.a[i] == mul_reordered.a[i]);
+    if (mul.a[i] != mul_reordered.a[i])
+      break;
+  }
+
+  return anyfail;
+}
+
+static bool com_test_run(void) {
+  bool anyfail = false;
+  if (com_test_fix()) {
+    com_std_print('c', "com_fix tests failed!");
+    anyfail = true;
+  }
+  if (com_test_bits()) {
+    com_std_print('c', "com_bits tests failed!");
+    anyfail = true;
+  }
+  if (com_test_mat()) {
+    com_std_print('c', "com_mat tests failed!");
+    anyfail = true;
+  }
+  return !anyfail;
+}
+
+#undef TEST

Common/vec.h

@@ -93,10 +93,4 @@ static inline com_fix_t com_vec_max(com_vec_t a) {
   return com_fix_max(com_fix_max(a.a[0], a.a[1]), a.a[2]);
 }
 
-static inline void com_vec_print(com_vec_t a) {
-  com_fix_print(a.a[0]);
-  com_fix_print(a.a[1]);
-  com_fix_print(a.a[2]);
-}
-
 #endif

Player/Display/display.h

@@ -1,7 +1,8 @@
 #ifndef PLR_DISPLAY_H
 #define PLR_DISPLAY_H
 
-__attribute__((used)) extern int plr_display_x11_main(int argc, char *argv[]);
+__attribute__((used)) extern int plr_display_x11_main(int argc,
+                                                      char const *const *argv);
 __attribute__((used)) extern int plr_display_dos_main(void);
 
 #endif

Player/Display/dos.c

@@ -1,17 +1,16 @@
 #include "display.h"
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stddef.h>
 #include <stdint.h>
-#include <string.h>
 
-#define WIDTH 640
-#define HEIGHT 480
+#define WIDTH 320
+#define HEIGHT 200
 #define MODE_VGA_320_200_8 0x13
 #define MODE_VESA_640_480_8 0x101
 
-/*
-  TODO: https://github.com/depp/elf2dos/blob/master/elf/elf.go
-        https://www.edm2.com/index.php/LX_-_Linear_eXecutable_Module_Format_Description
-  Do not use anything but Clang in the end.
-  */
+/* https://www.phatcode.net/res/262/files/dpmi09.html */
+/* http://www.techhelpmanual.com/27-dos__bios___extensions_service_index.html */
 
 // 8-color VGA palette gradient, lighter shades of lavender to pink
 #define COLOR_OFFSET 0x50
@@ -132,13 +131,183 @@
 //   return NULL;
 // }
 
+/* Not really needed i guess? */
+// static inline bool real_mode_interrupt(uint8_t interrupt) {
+//   bool carry_clear;
+//   __asm__ volatile("int $0x31"
+//                    : "=@ccnc"(carry_clear)
+//                    : "a"(0x0300), "b"(interrupt), "c"(0), "D"(&dpmi_regs)
+//                    : "memory", "cc");
+//   return !carry_clear;
+// }
+
+typedef struct {
+  uint16_t rm_segment;
+  uint16_t pm_selector;
+} LowMemBlock;
+
+// Allocates low memory under 1MB
+static inline LowMemBlock allocate_low_mem(uint32_t size_in_bytes) {
+  LowMemBlock block = {0, 0};
+  uint32_t paragraphs =
+      (size_in_bytes + 15) >> 4; // Convert bytes to paragraphs
+
+  uint16_t seg, sel;
+  uint8_t failed = 0;
+
+  __asm__ __volatile__(
+      "movw $0x0100, %%ax \n\t" // DPMI allocate DOS memory block
+      "int $0x31          \n\t"
+      "setc %2            \n\t" // Check Carry Flag for error
+      : "=a"(seg), "=d"(sel), "=r"(failed)
+      : "b"(paragraphs)
+      : "cc");
+
+  if (!failed) {
+    block.rm_segment = seg;
+    block.pm_selector = sel;
+  }
+  return block;
+}
+
+static inline void copy_to_low_mem(LowMemBlock block, char *data,
+                                   uint32_t size) {
+  __asm__ volatile("movw %0, %%es\n"
+                   "movw %1, %%di\n"
+                   "movw %2, %%si\n"
+                   "movw .data, %%ax\n"
+                   "movw %3, %%cx\n"
+                   "cld\n"
+                   "rep movsb" ::"r"(block.rm_segment),
+                   "r"(block.pm_selector), "r"(data), "r"(size)
+                   : "memory", "cc", "ax", "bx", "cx", "esi", "di");
+}
+
+// Frees the allocated low memory (DPMI Ax=0101h)
+static inline void free_low_mem(uint16_t selector) {
+  __asm__ __volatile__("movw $0x0101, %%ax \n\t" // DPMI free DOS memory block
+                       "int $0x31"
+                       :
+                       : "d"(selector)
+                       : "ax", "cc");
+}
+
+static inline void set_video_mode(uint16_t mode) {
+  __asm__ volatile("int $0x10" : : "a"(mode) : "memory", "cc");
+}
+
+/* http://www.techhelpmanual.com/439-dos_fn_40h__write_to_file_via_handle.html
+ */
+static inline void writetest(void) {
+  __asm__ volatile("int $0x21" : : "a"(0x0200), "d"('Y') : "memory", "cc");
+}
+
+/* http://www.techhelpmanual.com/630-int_31h_0800h__physical_address_mapping.html
+ */
+static inline void *map_physical_address(uint32_t physical_addr,
+                                         uint32_t size) {
+  uint16_t high, low;
+  bool carry_clear;
+  __asm__ volatile("int $0x31"
+                   : "=b"(high), "=c"(low), "=@ccnc"(carry_clear)
+                   : "a"(0x0800), "b"(physical_addr >> 16),
+                     "c"(physical_addr & 0xFFFF), "S"(size >> 16),
+                     "D"(size & 0xFFFF)
+                   : "memory", "cc");
+  return !carry_clear ? NULL : (void *)(intptr_t)((high << 16) | low);
+}
+
+static inline uint16_t alloc_ldt_descriptor(void) {
+  bool carry_clear;
+  uint16_t selector;
+  __asm__ volatile("int $0x31"
+                   : "=a"(selector), "=@ccnc"(carry_clear)
+                   : "a"(0x0000), "c"(1)
+                   : "memory", "cc");
+  return !carry_clear ? selector : 0;
+}
+
+static inline bool set_segment_base_address(uint16_t selector,
+                                            uint32_t baseaddr) {
+  bool carry_clear;
+  __asm__ volatile("int $0x31"
+                   : "=a"(selector), "=@ccnc"(carry_clear)
+                   : "a"(0x0007), "c"(baseaddr >> 16), "d"(baseaddr & 0xFFFF)
+                   : "memory", "cc");
+  return !carry_clear;
+}
+
+static inline bool set_segment_limit(uint16_t selector, uint32_t size) {
+  bool carry_clear;
+  __asm__ volatile("int $0x31"
+                   : "=@ccnc"(carry_clear)
+                   : "a"(0x0008), "b"(selector), "c"(size >> 16),
+                     "d"(size & 0xFFFF)
+                   : "memory", "cc");
+  return !carry_clear;
+}
+
+static inline bool set_segment_rights(uint16_t selector, bool read,
+                                      bool write) {
+  bool carry_clear;
+  uint16_t flags =
+      1 | (write << 1) | (1 << 4) | (1 << 7) | (1 << 14) | (1 << 15);
+  __asm__ volatile("int $0x31"
+                   : "=@ccnc"(carry_clear)
+                   : "a"(0x0009), "b"(selector), "c"(flags)
+                   : "memory", "cc");
+  return !carry_clear;
+}
+
+static inline void use_segment(uint16_t selector) {
+  __asm__ volatile("" : "=S"(selector)::);
+}
+
+/* https://tippach.hier-im-netz.de/wdosx/int21api.html#f09 */
+static inline void print_to_console(char *const str) {
+  __asm__ volatile("int $0x21" ::"a"(0x0900), "d"(str)
+                   : "memory", "cc", "esi", "edi", "esp");
+}
+
+static uint32_t test = 0x1420124;
+
 // extern int plr_display_dos_main(int argc, char *argv[]) {
 extern int plr_display_dos_main(void) {
-  char *buf = (char *)0xA0000; // VGA memory address
+  print_to_console("Fuck you stupid shit");
+  return -1;
+
+  uint16_t base = alloc_ldt_descriptor();
+  if (!base) {
+    print_to_console("Cannot allocate LDT descriptor");
+    return -1;
+  }
+
+  if (!set_segment_base_address(base, 0xA0000)) {
+    print_to_console("Cannot set LDT base address");
+    return -1;
+  }
+
+  if (!set_segment_limit(base, 0x10000)) {
+    print_to_console("Cannot set LDT limit");
+    return -1;
+  }
+
+  use_segment(base);
+
+  // char *volatile buf = (void *)(intptr_t)0xA0000; // VGA memory address
+  // char *buf = map_physical_address(0xA0000, 0x10000); // VGA memory
+  char *buf = map_physical_address(0xA0000, 0x10000); // VGA memory
+  // address
+  if (!buf)
+    return -1;
   int x, y;
 
+  // if (!buf)
+  //   return -1;
+
   // unsigned char saved_mode = get_video_mode(); // Save original mode
   // set_vesa_video_mode(MODE_VESA_640_480_8); // Set our VGA mode
+  set_video_mode(MODE_VGA_320_200_8); // Set our VGA mode
 
   // buf = find_display_memory();
 
@@ -162,9 +331,25 @@ extern int plr_display_dos_main(void) {
     for (y = 0; y < HEIGHT; y++) {
       for (x = 0; x < WIDTH; x++) {
         buf[y * WIDTH + x] = COLOR_OFFSET + y / COLOR_STEP;
+        // __asm__ volatile("int $0x10"
+        //                  :
+        //                  : "a"(0x0C << 8 | COLOR_OFFSET + y / COLOR_STEP),
+        //                    "b"(0), "c"(x), "d"(y)
+        //                  : "memory", "cc");
       }
     }
+    // writetest();
+    __asm__ volatile("int $0x16" : : "a"(0x00) : "memory", "cc");
   }
 
+  // dpmi_regs = (struct dpmi_regs){.eax = 0x00004C00};
+  // __asm__ volatile("movw $0x0300, %%ax\n"
+  //                  "movb $0x21, %%bl\n"
+  //                  "xorb %%bh, %%bh\n"
+  //                  "xorw %%cx, %%cx\n"
+  //                  "movl $dpmi_regs, %%edi\n"
+  //                  "int $0x31" ::
+  //                      : "memory", "cc", "ax", "bx", "cx", "edi");
+
   return 0;
 }

Player/Display/x11.c

@@ -1,6 +1,3 @@
-#include <X11/X.h>
-#include <X11/Xlib.h>
-#include <X11/Xutil.h>
 #include <fcntl.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -8,26 +5,60 @@
 #include <sys/un.h>
 
 #include "../../Common/bin.h"
+#include "../../Common/bits.h"
 #include "../../Common/buf.h"
 #include "../../Common/cfg.h"
+#include "../../Common/def.h"
 #include "../../Common/lzw.h"
-#include "../../Common/mat.h"
 #include "../../Common/std.h"
 #include "../../Common/str.h"
+#include "../../Common/test.h"
 #include "../draw.h"
 #include "display.h"
 
-/* https://hereket.com/posts/from-scratch-x11-windowing/ */
-/* https://gaultier.github.io/blog/write_a_video_game_from_scratch_like_1987.html
+#if COM_DEF_TARGET == COM_DEF_TARGET_COSMO
+#include <X.h>
+#else
+#include <X11/X.h>
+#endif
+
+/*
+  https://hereket.com/posts/from-scratch-x11-windowing/
+  https://gaultier.github.io/blog/write_a_video_game_from_scratch_like_1987.html
+  https://xorg.freedesktop.org/archive/X11R7.7-RC1/doc/xproto/x11protocol.html
 */
 
-bool quited = false;
+static struct {
+  uint32_t id;
+  uint32_t colormap;
+  uint32_t white;
+  uint32_t black;
+  uint32_t input_mask;
+  uint16_t width;
+  uint16_t height;
+  uint16_t width_mm;
+  uint16_t height_mm;
+  uint16_t maps_min;
+  uint16_t maps_max;
+  uint32_t root_visual_id;
+  uint8_t backing_store;
+  uint8_t save_unders;
+  uint8_t root_depth;
+  uint8_t depths_count;
+} plr_x11_root_screen;
 
-bool fileread(void *ctx, char *into, uint32_t bytes) {
+static struct {
+  uint32_t resource_id_base;
+  uint32_t resource_id_mask;
+} plr_x11_connection;
+
+static bool fileread(void *ctx, char *into, uint32_t bytes) {
   return com_std_read(ctx, into, bytes) == bytes;
 }
 
-bool fileskip(void *ctx, uint32_t bytes) { return com_std_sfwd(ctx, bytes); }
+static bool fileskip(void *ctx, uint32_t bytes) {
+  return com_std_sfwd(ctx, bytes);
+}
 
 #define AUTH_ENTRY_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1"
 
@@ -69,11 +100,12 @@ static struct plr_x11_auth_entry {
   result.success = true;
   return result;
 BREAK:
-  com_std_printf("Failure to initialize X11\n");
+  com_std_print('c', "Failure to initialize X11");
   return result;
 }
 
-static bool plr_x11_handshake(struct plr_x11_auth_entry auth_entry) {
+static bool plr_x11_handshake(com_std_fd xfd,
+                              struct plr_x11_auth_entry auth_entry) {
   struct {
     uint8_t endianness;
     uint8_t pad0;
@@ -83,75 +115,411 @@ static bool plr_x11_handshake(struct plr_x11_auth_entry auth_entry) {
     uint16_t auth_data_len;
     uint16_t pad1;
   } __attribute__((packed)) request = {
-      .endianness = 'l',
+      .endianness = COM_DEF_CPU_LITEND ? 'l' : 'B',
       .major_version = 11,
       .auth_len = sizeof(AUTH_ENTRY_MAGIC_COOKIE) - 1, // IS -1 NEEDED?
       .auth_data_len = auth_entry.auth_data->len,
   };
+
+  if (!com_std_write(xfd, &request, sizeof request))
+    return false;
+  if (!com_std_write(xfd, AUTH_ENTRY_MAGIC_COOKIE,
+                     sizeof AUTH_ENTRY_MAGIC_COOKIE - 1))
+    return false;
+  /* Use 2 bytes back for padding. */
+  if (!com_std_write(xfd, &auth_entry.auth_data->data[-2],
+                     auth_entry.auth_data->len + 2))
+    return false;
+
+  struct {
+    uint8_t success;
+    uint8_t pad1;
+    uint16_t major_version;
+    uint16_t minor_version;
+    uint16_t length;
+  } __attribute__((packed)) response;
+
+  if (!com_std_read(xfd, &response, sizeof response))
+    return false;
+  if (response.success != 1)
+    return false;
+
+  /* https://xorg.freedesktop.org/archive/X11R7.7-RC1/doc/xproto/x11protocol.html#server_response
+   */
+  struct {
+    uint32_t release_number;
+    uint32_t resource_id_base;
+    uint32_t resource_id_mask;
+    uint32_t motion_buffer_size;
+    uint16_t vendor_length;
+    uint16_t maximum_request_length;
+    uint8_t screens_in_root_count;
+    uint8_t formats_count;
+    uint8_t image_byte_order;
+    uint8_t bitmap_format_bit_order;
+    uint8_t bitmap_format_scanline_unit;
+    uint8_t bitmap_format_scanline_pad;
+    uint8_t min_keycode;
+    uint8_t max_keycode;
+    uint32_t pad2;
+  } __attribute__((packed)) dyn_response;
+
+  if (!com_std_read(xfd, &dyn_response, sizeof dyn_response))
+    return false;
+
+  /* Skip vendor and format info. */
+  char scratch[1024];
+  uint32_t skip = com_bits_nalign(dyn_response.vendor_length, 4);
+  com_std_assert(skip <= sizeof scratch);
+  com_std_assert(8 * dyn_response.formats_count <= sizeof scratch);
+  if (!com_std_read(xfd, scratch, skip))
+    return false;
+  if (!com_std_read(xfd, scratch, 8 * dyn_response.formats_count))
+    return false;
+  /* Read first and hope it is what we need. */
+  if (!com_std_read(xfd, &plr_x11_root_screen, sizeof plr_x11_root_screen))
+    return false;
+  /* Then drop all the things that proceed, such as other screens and their
+   * visual profiles. */
+  while (com_std_has_data(xfd))
+    com_std_read(xfd, scratch, sizeof scratch);
+
+  plr_x11_connection.resource_id_base = dyn_response.resource_id_base;
+  plr_x11_connection.resource_id_mask = dyn_response.resource_id_mask;
+
   return true;
 }
 
-// TODO: correct error handling.
-extern int plr_display_x11_main(int argc, char *argv[]) {
-  char test_string[] = "what is this?";
-  char *compressed_string = NULL;
-  uint32_t compressed_string_sz = 0;
-  struct com_lzw_table table =
-      com_lzw_infer_table(test_string, sizeof(test_string));
-  bool test = com_lzw_compress(&table, test_string, sizeof(test_string),
-                               &compressed_string, &compressed_string_sz);
-  com_lzw_free_table(&table);
-  com_std_assert(test);
+union plr_x11_response {
+  struct {
+    uint8_t type;
+    uint8_t errcode;
+    uint16_t sequenceid;
+    uint32_t badval;
+    uint16_t minorop;
+    uint32_t majorop;
+    char pad[18];
+  } __attribute__((packed)) error;
+  struct {
+    uint8_t type;
+    uint8_t data;
+    uint16_t sequenceid;
+    uint32_t length;
+    char pad[24];
+  } __attribute__((packed)) reply;
+};
 
-  com_mat_t m0 = com_mat_identity();
-  com_mat_t m1 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
-  for (int i = 0; i < 16; ++i)
-    m1.a[i] *= COM_FIX_FRACUNIT;
+static bool plr_x11_poll(com_std_fd xfd, bool wait,
+                         union plr_x11_response *response) {
+  if (!wait && !com_std_has_data(xfd))
+    return false;
 
-  com_mat_t t0 = com_mat_mul(m1, m0);
-  com_mat_t t1 = com_mat_mul_reodered(com_mat_reoder(m1), m0);
-  com_fix_print(t0.a[4]);
-  com_fix_print(t1.a[4]);
-
-  // com_vec_t v0 = com_mat_vec_project(com_mat_reoder(m0), com_vec_identity());
-  // com_fix_print(v0.a[0]);
-
-  // com_fix_run_tests();
-  // com_fix_run_bench();
-  // com_mat_run_bench();
-
-  /* TODO: Move init to separate func. */
-  /* Open X11 socket for communication. */
-  com_std_fd const xfd = com_std_socket(false);
-  if (!xfd) {
-    com_std_printf("Failure to initialize X11\n");
-    return -1;
+  com_std_read(xfd, response, sizeof(union plr_x11_response));
+  return true;
 }
 
-  if (!com_std_connect(xfd, false, "/tmp/.X11-unix/X0")) {
-    com_std_printf("Failure to initialize X11\n");
-    return -1;
+static bool plr_x11_poll_reply(com_std_fd xfd, uint16_t seqid,
+                               union plr_x11_response *response) {
+  while (plr_x11_poll(xfd, true, response)) {
+    /* Wait for match. */
+    if (response->reply.type == 1 && response->reply.sequenceid == seqid)
+      break;
+
+    /* Errors could be encountered here, report along the way. */
+    if (response->reply.type == 0) {
+      com_std_print('c', "X11 error code=", 'u', response->error.errcode, 'c',
+                    " for seqid=", 'u', response->error.sequenceid);
+    }
   }
 
-  /* First we need to authenticate X11 connection, which requires some funk. */
+  return true;
+}
+
+/* TODO: Instead we should poll for events, errors are only byproduct. */
+static bool plr_x11_poll_errors(com_std_fd xfd) {
+  union plr_x11_response response;
+
+  while (plr_x11_poll(xfd, false, &response)) {
+    /* There should be no replies unhandled. */
+    /* TODO: Write down encountered events. */
+    if (response.reply.type == 1)
+      return false;
+
+    if (response.reply.type == 0)
+      com_std_print('c', "X11 error code=", 'u', response.error.errcode, 'c',
+                    " for seqid=", 'u', response.error.sequenceid);
+  }
+
+  return true;
+}
+
+static inline uint32_t plr_x11_next_id(void) {
+  static uint32_t cur_id = 0;
+  cur_id = 1 + ((plr_x11_connection.resource_id_mask & (cur_id)) |
+                plr_x11_connection.resource_id_base);
+  return cur_id;
+}
+
+/* Used to number requests. */
+static inline uint32_t plr_x11_next_seqid(void) {
+  static uint32_t cur_id = 1;
+  return cur_id++;
+}
+
+static uint32_t plr_x11_create_graphical_context(com_std_fd xfd) {
+  uint32_t const gc_id = plr_x11_next_id();
+  uint32_t const seq = plr_x11_next_seqid();
+  struct {
+    uint8_t opcode;
+    uint8_t pad1;
+    uint16_t request_length;
+    uint32_t id;
+    uint32_t drawable;
+    uint32_t bitmask;
+    uint32_t value1;
+  } __attribute__((packed)) request = {
+      .opcode = 55,
+      .request_length = sizeof request / 4,
+      .id = gc_id,
+      .drawable = plr_x11_root_screen.id,
+      .bitmask = 8, /* TODO: Figure out. */
+      .value1 = 0x00000000,
+  };
+
+  if (!com_std_write(xfd, &request, sizeof request))
+    return 0;
+  return gc_id;
+}
+
+static uint32_t plr_x11_create_window(com_std_fd xfd) {
+/* TODO: Use the ones provided in headers ? */
+#define FLAG_WIN_BG_PIXEL 2
+#define FLAG_WIN_EVENT 0x800
+#define EVENT_FLAG_EXPOSURE 0x8000
+#define EVENT_FLAG_KEY_PRESS 0x1
+#define EVENT_FLAG_KEY_RELEASE 0x2
+#define EVENT_FLAG_BUTTON_PRESS 0x4
+#define EVENT_FLAG_BUTTON_RELEASE 0x8
+
+  uint32_t const window_id = plr_x11_next_id();
+  uint32_t const seq = plr_x11_next_seqid();
+  struct {
+    uint8_t opcode;
+    uint8_t depth;
+    uint16_t request_length;
+    uint32_t window_id;
+    uint32_t parent_id;
+    uint16_t x;
+    uint16_t y;
+    uint16_t width;
+    uint16_t height;
+    uint16_t border_width;
+    uint16_t class;
+    uint32_t root_visual_id;
+    uint32_t bitmask;
+    uint32_t value1;
+    uint32_t value2;
+  } __attribute__((packed)) request = {
+      .opcode = 1,
+      .depth = COM_CFG_COLORS * 8,
+      .request_length = sizeof request / 4,
+      .window_id = window_id,
+      .parent_id = plr_x11_root_screen.id,
+      .width = COM_CFG_WIDTH,
+      .height = COM_CFG_HEIGHT,
+      .border_width = 0,
+      .class = 1,
+      .root_visual_id = plr_x11_root_screen.root_visual_id,
+      .bitmask = FLAG_WIN_BG_PIXEL | FLAG_WIN_EVENT,
+      .value1 = 0x00000000,
+      .value2 = EVENT_FLAG_EXPOSURE | EVENT_FLAG_BUTTON_RELEASE |
+                EVENT_FLAG_BUTTON_PRESS | EVENT_FLAG_KEY_PRESS |
+                EVENT_FLAG_KEY_RELEASE,
+  };
+
+  if (!com_std_write(xfd, &request, sizeof request))
+    return 0;
+  return window_id;
+}
+
+static bool plr_x11_show_window(com_std_fd xfd, uint32_t window_id) {
+  uint32_t const seq = plr_x11_next_seqid();
+  struct {
+    uint8_t opcode;
+    uint8_t pad1;
+    uint16_t request_length;
+    uint32_t window_id;
+  } __attribute__((packed)) request = {
+      .opcode = 8,
+      .request_length = sizeof request / 4,
+      .window_id = window_id,
+  };
+  return com_std_write(xfd, &request, sizeof request);
+}
+
+static uint32_t plr_x11_create_pixmap(com_std_fd xfd, uint32_t window_id) {
+  uint32_t const pixmap_id = plr_x11_next_id();
+  uint32_t const seq = plr_x11_next_seqid();
+  struct {
+    uint8_t opcode;
+    uint8_t depth;
+    uint16_t request_length;
+    uint32_t pixmap_id;
+    uint32_t drawable;
+    uint16_t width;
+    uint16_t height;
+  } __attribute__((packed)) request = {
+      .opcode = 53,
+      .depth = COM_CFG_COLORS * 8,
+      .request_length = sizeof request / 4,
+      .pixmap_id = pixmap_id,
+      .drawable = window_id,
+      .width = COM_CFG_WIDTH,
+      .height = COM_CFG_HEIGHT,
+  };
+
+  if (!com_std_write(xfd, &request, sizeof request))
+    return 0;
+  return pixmap_id;
+}
+
+/* Returns opcode for given extension. */
+static uint8_t plr_x11_query_extension(com_std_fd xfd, com_str const *ext) {
+  uint32_t const seq = plr_x11_next_seqid();
+  uint16_t const pad = com_bits_nalign(ext->len, 4);
+  struct {
+    uint8_t opcode;
+    uint8_t pad1;
+    uint16_t request_length;
+    uint16_t name_length;
+    uint16_t pad2;
+  } __attribute__((packed)) request = {
+      .opcode = 98,
+      .request_length = sizeof request / 4 + pad / 4,
+      .name_length = ext->len,
+  };
+
+  if (!com_std_write(xfd, &request, sizeof request))
+    return 0;
+  if (!com_std_write(xfd, ext->data, ext->len))
+    return 0;
+  if ((pad - ext->len) && !com_std_write(xfd, ext->data, pad - ext->len))
+    return 0;
+
+  union plr_x11_response response;
+  plr_x11_poll_reply(xfd, seq, &response);
+
+  return response.reply.pad[1];
+}
+
+/*
+  This is needed as base X11 doesn't allow passing more than 16bit x 4bytes.
+  https://xorg.freedesktop.org/archive/current/doc/bigreqsproto/bigreq.html
+*/
+static bool plr_x11_enable_big_requests(com_std_fd xfd) {
+  static com_str bigreqext = com_str_lit("BIG-REQUESTS");
+  uint8_t const opcode = plr_x11_query_extension(xfd, &bigreqext);
+
+  /* Request the thing. */
+  struct {
+    uint8_t opcode;
+    uint8_t micode;
+    uint16_t request_length;
+  } __attribute__((packed)) request = {
+      .opcode = opcode,
+      .request_length = sizeof request / 4,
+  };
+
+  uint32_t const seq = plr_x11_next_seqid();
+  if (!com_std_write(xfd, &request, sizeof request))
+    return 0;
+
+  /* Read the response. */
+  union plr_x11_response response;
+  plr_x11_poll_reply(xfd, seq, &response);
+
+  uint32_t const limit = *(uint32_t *)response.reply.pad;
+  com_std_print('c', "Request limit: ", 'u', limit);
+  if (limit < COM_CFG_FBSIZE) {
+    com_std_print('c', "Big request can't accommodate for framebuffer.");
+    return false;
+  }
+
+  return true;
+}
+
+static bool plr_x11_put_framebuffer(com_std_fd xfd, uint32_t gc_id,
+                                    uint32_t pixmap_id,
+                                    uint8_t pixels[COM_CFG_FBSIZE]) {
+  uint32_t const padded = com_bits_nalign(COM_CFG_FBSIZE, 4);
+  uint32_t const seq = plr_x11_next_seqid();
+
+  struct {
+    uint8_t opcode;
+    uint8_t format;
+    uint16_t bigreq; /* Marked zero so that 32bit could be used. */
+    uint32_t request_length;
+    uint32_t drawable_id;
+    uint32_t gc_id;
+    uint16_t width;
+    uint16_t height;
+    uint16_t dst_x;
+    uint16_t dst_y;
+    uint8_t left_pad;
+    uint8_t depth;
+    uint16_t pad1;
+  } __attribute__((packed)) request = {
+      .opcode = 72,
+      .format = 2, // ZPixmap
+      .request_length = sizeof request / 4 + padded / 4,
+      .drawable_id = pixmap_id,
+      .gc_id = gc_id,
+      .width = COM_CFG_WIDTH,
+      .height = COM_CFG_HEIGHT,
+      .dst_x = 0,
+      .dst_y = 0,
+      .depth = COM_CFG_COLORS * 8,
+  };
+
+  if (!com_std_write(xfd, &request, sizeof request))
+    return false;
+  if (!com_std_write(xfd, pixels, COM_CFG_FBSIZE))
+    return false;
+  /* Use request memory for pad, it doesn't matter what we write. */
+  if ((padded - COM_CFG_FBSIZE) &&
+      !com_std_write(xfd, &pixels, padded - COM_CFG_FBSIZE))
+    return false;
+  return true;
+}
+
+static bool plr_x11_establish_connection(com_std_fd xfd, int argc,
+                                         char const *const *argv) {
+  com_buf_make_on_stack(char, xauthbuf, 1024, 0);
+
+/* TODO: Genralize inside std? */
+#if COM_DEF_TARGET == COM_DEF_TARGET_COSMO
+  char const *xauthpath = getenv("XAUTHORITY");
+#else
+  /* First we need to authenticate X11 connection, which requires some funk.
+   */
   /* We assume that $XAUTHORITY is set and I hope it is true. */
-  char *xauthpath = NULL;
-  for (char **envp = &argv[argc + 1]; *envp != NULL; ++envp) {
+  char const *xauthpath = NULL;
+  for (char const *const *envp = &argv[argc + 1]; *envp != NULL; ++envp) {
     static const struct com_str xauthlit = com_str_lit("XAUTHORITY=");
-    if (com_str_ext_prefixed(*envp, xauthlit)) {
+    if (com_str_ext_prefixed(*envp, &xauthlit)) {
       xauthpath = &((*envp)[xauthlit.len]);
       break;
     }
   }
+#endif
 
   /* Open it and parse. */
   com_std_fd const xauthfd = com_std_open(xauthpath, COM_STD_OPEN_READ);
-  if (xauthfd < 0) {
-    com_std_printf("Failure to initialize X11\n");
-    return -1;
+  if (!xauthfd) {
+    com_std_print('c', "Failure to initialize X11");
+    return false;
   }
 
-  com_buf_make_on_stack(char, xauthbuf, 1024, 0);
   struct com_bin xauthbin = {
       .ctx = (void *)(int64_t)xauthfd,
       .flags = COM_BIN_BIG_ENDIAN,
@@ -164,29 +532,89 @@ extern int plr_display_x11_main(int argc, char *argv[]) {
     auth_entry = plr_x11_read_auth_entry(&xauthbin, xauthbuf);
   } while (auth_entry.success && auth_entry.family != 256);
   if (!auth_entry.success) {
-    com_std_printf("Failure to initialize X11\n");
-    return -1;
+    com_std_print('c', "Failure to initialize X11");
+    return false;
   }
 
   com_std_close(xauthfd);
 
   /* TODO: Check for auth_entry.name == MAGIC ? */
-  plr_x11_handshake(auth_entry);
+  if (!plr_x11_handshake(xfd, auth_entry)) {
+    com_std_print('c', "Failure to initialize X11");
+    return false;
+  }
 
   com_buf_free(xauthbuf);
 
-  char sendbuf[16 * 1024] = {};
-  char readbuf[16 * 1024] = {};
+  return true;
+}
+
+// TODO: correct error handling.
+extern int plr_display_x11_main(int argc, char const *const *argv) {
+  char test_string[] = "what is this?";
+  char *compressed_string = NULL;
+  uint32_t compressed_string_sz = 0;
+  struct com_lzw_table table =
+      com_lzw_infer_table(test_string, sizeof(test_string));
+  bool test = com_lzw_compress(&table, test_string, sizeof(test_string),
+                               &compressed_string, &compressed_string_sz);
+  com_lzw_free_table(&table);
+  com_std_assert(test);
+
+/* TODO: Move to separate executable maybe? */
+#ifndef NDEBUG
+  com_test_run();
+#endif
+
+  /* Open X11 socket for communication. */
+  com_std_fd const xfd = com_std_socket(false);
+  if (!xfd) {
+    com_std_print('c', "Failure to initialize X11");
+    return -1;
+  }
+
+  if (!com_std_connect(xfd, false, "/tmp/.X11-unix/X0")) {
+    com_std_print('c', "Failure to initialize X11");
+    return -1;
+  }
+
+  if (!plr_x11_establish_connection(xfd, argc, argv)) {
+    com_std_print('c', "Failure to initialize X11");
+    return -1;
+  }
+
+  if (!plr_x11_enable_big_requests(xfd)) {
+    com_std_print('c', "Big requests unsupported for your X11");
+    return -1;
+  }
+
+  uint32_t const gc = plr_x11_create_graphical_context(xfd);
+  if (!gc) {
+    com_std_print('c', "Failure to initialize X11");
+    return -1;
+  }
+
+  uint32_t const win = plr_x11_create_window(xfd);
+  if (!win) {
+    com_std_print('c', "Failure to initialize X11");
+    return -1;
+  }
+
+  uint32_t const fb = plr_x11_create_pixmap(xfd, win);
+  if (!fb) {
+    com_std_print('c', "Failure to initialize X11");
+    return -1;
+  }
 
   // Display *display = XOpenDisplay(NULL);
   // if (NULL == display) {
-  //   com_std_printf("Failed to initialize display");
+  //   com_std_print('c', "Failed to initialize display");
   //   return -1;
   // }
 
   // Window root = DefaultRootWindow(display);
   // if (None == root) {
-  //   com_std_printf("No root window found");
+  //   com_std_print('c', "No root window found");
   //   XCloseDisplay(display);
   //   return -1;
   // }
@@ -199,7 +627,7 @@ extern int plr_display_x11_main(int argc, char *argv[]) {
   //     XCreateSimpleWindow(display, root, 0, 0, WIDTH, HEIGHT, 0, 0,
   //     0xffffffff);
   // if (None == window) {
-  //   com_std_printf("Failed to create window");
+  //   com_std_print('c', "Failed to create window");
   //   XCloseDisplay(display);
   //   return -1;
   // }
@@ -233,7 +661,7 @@ extern int plr_display_x11_main(int argc, char *argv[]) {
   //                               pixel_buffer, WIDTH, HEIGHT, 32, 0);
 
   // if (!ximage) {
-  //   com_std_printf("Failed to create XImage\n");
+  //   com_std_print('c', "Failed to create XImage");
   //   // com_std_alloc(pixel_buffer, 0);
   //   XCloseDisplay(display);
   //   return -1;
@@ -273,7 +701,24 @@ extern int plr_display_x11_main(int argc, char *argv[]) {
 
   // XCloseDisplay(display);
 
+  uint8_t *fbm = plr_draw_get_pixel_buffer();
+  plr_draw_screen(fbm);
+
+  if (!plr_x11_put_framebuffer(xfd, gc, fb, fbm)) {
+    com_std_print('c', "Failure to drive X11");
+    return -1;
+  }
+
+  if (!plr_x11_show_window(xfd, win)) {
+    com_std_print('c', "Failure to drive X11");
+    return -1;
+  }
+
   while (1) {
+    if (!plr_x11_poll_errors(xfd)) {
+      com_std_print('c', "X11 closed connection");
+      return -1;
+    }
   }
 
   return 0;

Player/Main/cosmo.c

@@ -0,0 +1,5 @@
+#include "../Display/display.h"
+
+extern int main(int argc, char const *const *argv) {
+  return plr_display_x11_main(argc, argv);
+}

Player/Main/dos.s

@@ -1,47 +1,18 @@
 .section .data
     .align 4
+# TODO: Make sure it's placed under 1 MiB.
 # The DPMI Register Structure (50 bytes total)
 # This holds the register states injected into Real Mode.
-dpmi_regs:
-    .long 0         # edi  (offset 0)
-    .long 0         # esi  (offset 4)
-    .long 0         # ebp  (offset 8)
-    .long 0         # esp / reserved (offset 12)
-    .long 0         # ebx  (offset 16)
-    .long 0         # edx  (offset 20)
-    .long 0         # ecx  (offset 24)
-dpmi_eax:
-    .long 0         # eax  (offset 28)
-    .short 0        # flags(offset 32)
-    .short 0        # es   (offset 34)
-    .short 0        # ds   (offset 36)
-    .short 0        # fs   (offset 38)
-    .short 0        # gs   (offset 40)
-    .short 0        # ip   (offset 42)
-    .short 0        # cs   (offset 44)
-    .short 0        # sp   (offset 46)
-    .short 0        # ss   (offset 48)
 
 .section .text
 .global _start
 
 _start:
+    push %ebp
+    mov %esp, %ebp
+    cld
+
     call plr_display_dos_main
 
-    # 1. Set up the Real-Mode registers inside the DPMI structure
-    # AH = 4Ch (DOS Exit Function), AL = 00h (Return Code 0)
-    movl $0x00004C00, dpmi_eax
-
-    # 2. Call DPMI Simulate Real Mode Interrupt
-    movw $0x0300, %ax    # DPMI Function: Simulate Real Mode Interrupt
-    movb $0x21, %bl      # Interrupt number to trigger (INT 21h)
-    movb $0x00, %bh      # Flags (Must be 0)
-    movw $0x0000, %cx    # Number of words to copy to RM stack (0)
-    
-    # ES:EDI points to our DPMI register block. 
-    # In WDOSX flat model, %es already targets the flat data descriptor.
-    movl $dpmi_regs, %edi
-    
-    int $0x31            # Trigger DPMI host to execute the RM interrupt
-
-    # --- Execution halts here as DOS terminates the program ---
+    movb $0x4C, %ah
+    int $0x21

Player/Main/libc.c

@@ -1,3 +0,0 @@
-#include "../Display/display.h"
-
-extern int main(int argc, char **argv) { plr_display_x11_main(argc, argv); }

Player/Makefile

@@ -1,17 +1,44 @@
-CC = clang
+CC 		?= clang
 RELEASE ?= 0 # Optimize.
 DEBUG 	?= 1 # Emit debug info.
 SQUEEZE ?= 0 # Nuclear option to save space.
 BITS 	?= 64
-CFLAGS = -Wall -std=gnu99 -flto=thin -ffast-math -fno-ident -fvisibility=hidden -fuse-ld=lld
+RUN 	?= 0
+
+CFLAGS 	= -Wall -std=gnu99 -ffast-math -fno-ident -fvisibility=hidden
+
+# Set cosmopolitan toolchain.
+ifeq ($(MAKECMDGOALS),cosmo)
+	CC = ./Cosmo/bin/cosmocc -mclang
+	ifeq ($(DEBUG), 1)
+	    CFLAGS += -mdbg
+	else
+	    CFLAGS += -mtiny
+	endif
+endif
+
+# Provide LTO where it's applicable.
+ifeq ($(CC),clang)
+	ISCLANG = 1
+	CFLAGS += -flto=thin -fuse-ld=lld
+else
+	ifneq ($(MAKECMDGOALS),cosmo)
+		CFLAGS += -flto
+	endif
+endif
+
+# Linux specific options.
 ifeq ($(MAKECMDGOALS),linux)
 	CFLAGS += -fno-pic -fno-pie
 	ifeq ($(RELEASE), 1)
-	    CFLAGS += -Wl,--ignore-data-address-equality -Wl,--ignore-function-address-equality \
+# 	    CFLAGS += -Wl,--ignore-data-address-equality -Wl,--ignore-function-address-equality \
 	    		  -Wl,--optimize-bb-jumps
 	endif
 	ifeq ($(SQUEEZE), 1)
-	    CFLAGS += -Wl,-T,tiny.ld -Wl,--icf=all -Wl,--bp-compression-sort=both \
+		ifeq ($(DEBUG), 0)
+			CFLAGS += -Wl,-T,tiny.ld 
+		endif
+	    CFLAGS += -Wl,--icf=all -Wl,--bp-compression-sort=both \
 	    		  -Wl,--nmagic
 	endif
 	ifeq ($(BITS), 64)
@@ -20,57 +47,65 @@ ifeq ($(MAKECMDGOALS),linux)
 		CFLAGS += -m32 -msse2
 	endif
 endif
+
+# WASM specific options.
 ifeq ($(MAKECMDGOALS),wasm)
 	ifeq ($(RELEASE), 1)
 	    CFLAGS += -Wl,--compress-relocations
 	endif
 endif
+
+# Separate debug and release switches.
 ifeq ($(DEBUG), 1)
     CFLAGS += -g3
 else
-    CFLAGS += -DNDEBUG -Wl,--strip-all
+    CFLAGS += -DNDEBUG -s
 endif
 ifeq ($(RELEASE), 1)
     CFLAGS += -O3 -fmerge-all-constants -Wl,-O3 \
-    		  -ffunction-sections -fdata-sections -Wl,--gc-sections \
-    		  -Wl,-mllvm,--vectorize-slp=true \
+    		  -ffunction-sections -fdata-sections -Wl,--gc-sections
+	ifeq ($(CC),clang)
+		CFLAGS += -Wl,-mllvm,--vectorize-slp=true \
     		  	  -Wl,-mllvm,--enable-gvn-hoist=true
 	endif
-# TODO: Just use amalgam build for all?
-DEPS = ../Common/lzw.h ../Common/mat.h ../Common/vec.h ../Common/fix.h ../Common/def.h ../Common/bits.h \
-	   ../Common/gem.h \
-	   ../Common/Timer/time.h \
-	    ./Display/display.h \
-	    ./draw.h
-SRC = ../Common/lzw.c ../Common/fix.c ../Common/mat.c ./draw.c
-LINUX = ./amalgam.c
-WASM = ./amalgam.c
-DOS = maindos.c Display/dos.c
+endif
 
-%.o: %.c $(DEPS)
-	$(CC) -c -o $@ $< $(CFLAGS)
-
-%.o: %.s $(DEPS)
-	$(CC) -c -o $@ $< $(CFLAGS)
-
-# TODO: Make it work with no stdlib.
 linux: CFLAGS += -static -mbmi2 -nostdlib
-linux: $(LINUX) | $(SRC)
+linux: ./amalgam.c
 	$(CC) -o player $^ $(CFLAGS)
 
 # Note: lld package might need to be downloaded.
 wasm: CFLAGS += --target=wasm32 -nostdlib -Wl,--no-entry -msimd128 -mbulk-memory
 wasm:
-	$(CC) -o player.wasm $(WASM) $(CFLAGS)
+	$(CC) -o player.wasm ./amalgam.c $(CFLAGS)
+
+# todo: Add -mtiny for release without debug
+cosmo: CFLAGS += -I /usr/include/X11
+cosmo: ./amalgam.c
+	$(CC) $(CFLAGS) -o ./Out/Cosmo/player $^
+ifeq ($(RUN), 1)
+ifeq ($(DEBUG), 1)
+	gdb ./Out/Cosmo/player.com.dbg
+else 
+	./Out/Cosmo/player
+endif
+endif
 
 # https://tippach.hier-im-netz.de/wdosx
-dos: CFLAGS += -ffreestanding -m32 -fno-PIC -fno-PIE -no-pie -nostdlib -nodefaultlibs
+dos: CFLAGS += -ffreestanding -m32 -fno-PIC -fno-PIE -nostdlib -nodefaultlibs
 dos: 
-	$(CC) -c ./Main/dos.s -o ./Main/dos.o $(CFLAGS)
+	$(CC) -c ./Main/dos.s -o ./Main/dos.o -m32
 	$(CC) -c ./Display/dos.c -o ./Display/dos.o $(CFLAGS)
-	ld.lld -m elf_i386 --oformat binary -Ttext 0x0 --image-base=0x0 ./Main/dos.o ./Display/dos.o -o dos.bin
-	dosbox -noconsole -c "mount c $(PWD)" -c "c:" -c "WDOSX\STUBIT.EXE DOS.BIN" -exit
-	mv ./DOS.BIN ./DOS.EXE
+	ld.lld -m elf_i386 -T dos.ld ./Main/dos.o ./Display/dos.o -o dos.elf
+	objcopy -O binary --strip-all dos.elf dos.bin
+	cat WDosX/WDOSX.DX dos.bin > DOS.EXE
+ifeq ($(RUN), 1)
+ifeq ($(DEBUG), 1)
+	dosbox -c "mount c $(PWD)" -c "c:" -c "WDOSX\WUDEBUG.EXE DOS.EXE"
+else 
+	dosbox -c "mount c $(PWD)" -c "c:" -c "DOS.EXE"
+endif
+endif
 
 clean:
 	rm -r *.o ../*.o

Player/Out/Cosmo/run.cmd

@@ -0,0 +1,8 @@
+:;# amalgam of batch and shell scripts as a entry single point
+
+:; SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+:; $SCRIPT_DIR/ape $SCRIPT_DIR/player
+:; exit
+
+@echo off
+player

Player/amalgam.c

@@ -21,8 +21,12 @@
 #endif
 #include "../Common/Timer/stub.c"
 #include "./Display/x11.c"
-// #include "./Main/libc.c"
 #elif COM_DEF_TARGET == COM_DEF_TARGET_WASM
 #include "../Common/Std/stub.c"
 #include "../Common/Timer/stub.c"
+#elif COM_DEF_TARGET == COM_DEF_TARGET_COSMO
+#include "../Common/Std/libc.c"
+#include "../Common/Timer/posix.c"
+#include "./Display/x11.c"
+#include "./Main/cosmo.c"
 #endif

Player/dos.ld

@@ -0,0 +1,41 @@
+SECTIONS
+{
+  . = 0x00000;
+
+  /* TODO: Make sure WDOSX.DX is placed first, before .text */
+  textstart = .;
+  .text ALIGN(16) : {
+    *(.text*)
+  }
+  textend = .;
+
+  /* We will need to manually map this. */
+  /* At runtime we can figure this out from mapped code segment. */
+  datastart = .;
+  .rodata : {
+    *(.rodata*)
+  }
+
+  .data : {
+    *(.data*)
+  }
+  dataend = .;
+
+  /* TODO: We need to manually map this, as loader is incapable of doing so with flat binary. */
+  bssstart = .;
+  .bss : {
+    *(.bss*)
+    *(COMMON)
+  }
+  bssend = .;
+
+  /* Will be discarded with objcopy. */
+  .shstrtab : {
+    *(.shstrtab*)
+  }
+
+  /* Discard bloat and unnecessary ELF sections */
+  /DISCARD/ : {
+    *(*)
+  }
+}

Player/draw.c

@@ -2,70 +2,71 @@
 #include "../Common/cfg.h"
 #include "../Common/def.h"
 #include "../Common/gem.h"
-#include "../Common/std.h"
 #include "../Common/time.h"
 #include <stdint.h>
 
-#if COM_DEF_TARGET == COM_DEF_TARGET_WASM
-uint8_t plr_draw_buffer[COM_CFG_WIDTH * COM_CFG_HEIGHT * 4];
+static _Alignas(16) uint8_t plr_draw_buffer[COM_CFG_FBSIZE];
 
 com_def_export_sym(
     "plr_draw_get_pixel_buffer") uint8_t *plr_draw_get_pixel_buffer(void) {
   return plr_draw_buffer;
 }
-#endif
 
 com_def_export_sym("plr_draw_screen") void plr_draw_screen(
     uint8_t *pixel_buffer) {
+  uint8_t *pixel_buffer_aligned = __builtin_assume_aligned(pixel_buffer, 16);
   for (int y = 0; y < COM_CFG_HEIGHT; y++) {
     for (int x = 0; x < COM_CFG_WIDTH; x++) {
-      int pixel_index = (y * COM_CFG_WIDTH + x) * 4;
+      int pixel_index = (y * COM_CFG_WIDTH + x) * COM_CFG_COLORS;
 
       // Assuming standard Little-Endian 32-bit BGRA format
-      pixel_buffer[pixel_index + 0] = (x) % 256;     // Blue
-      pixel_buffer[pixel_index + 1] = (y) % 256;     // Green
-      pixel_buffer[pixel_index + 2] = (x + y) % 256; // Red
-      pixel_buffer[pixel_index + 3] = 255;           // Alpha/Padding
+      pixel_buffer_aligned[pixel_index + 0] = (x) % 256;     // Blue
+      pixel_buffer_aligned[pixel_index + 1] = (y) % 256;     // Green
+      pixel_buffer_aligned[pixel_index + 2] = (x + y) % 256; // Red
+#if COM_CFG_COLORS == 4
+      pixel_buffer_aligned[pixel_index + 3] = 255; // Alpha/Padding
+#endif
     }
   }
 
-  com_mat_t proj = com_mat_perspective(COM_CFG_WIDTH, COM_CFG_HEIGHT, 1,
-                                       100 * COM_FIX_FRACUNIT, COM_FIX_PIHALF);
-  com_mat_t view = com_mat_look_at(com_vec_from(0, 0, 0),
-                                   com_vec_from(0, COM_FIX_FRACUNIT, 0),
-                                   com_vec_from(-COM_FIX_FRACUNIT, 0, 0));
-  com_mat_t mvp = com_mat_reoder(com_mat_mul(proj, view));
+  // com_mat_t proj = com_mat_perspective(COM_CFG_WIDTH, COM_CFG_HEIGHT, 1,
+  //                                      100 * COM_FIX_FRACUNIT,
+  //                                      COM_FIX_PIHALF);
+  // com_mat_t view = com_mat_look_at(com_vec_from(0, 0, 0),
+  //                                  com_vec_from(0, COM_FIX_FRACUNIT, 0),
+  //                                  com_vec_from(-COM_FIX_FRACUNIT, 0, 0));
+  // com_mat_t mvp = com_mat_reoder(com_mat_mul(proj, view));
 
-  com_vec_t v0 = com_vec_from(0 * COM_FIX_FRACUNIT, 0, 1 * COM_FIX_FRACUNIT);
-  com_vec_t v1 = com_vec_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT,
-                              1 * COM_FIX_FRACUNIT);
-  com_vec_t v2 = com_vec_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT,
-                              1 * COM_FIX_FRACUNIT);
-  com_vec_t v3 = com_vec_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT,
-                              -1 * COM_FIX_FRACUNIT);
+  // com_vec_t v0 = com_vec_from(0 * COM_FIX_FRACUNIT, 0, 1 * COM_FIX_FRACUNIT);
+  // com_vec_t v1 = com_vec_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT,
+  //                             1 * COM_FIX_FRACUNIT);
+  // com_vec_t v2 = com_vec_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT,
+  //                             1 * COM_FIX_FRACUNIT);
+  // com_vec_t v3 = com_vec_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT,
+  //                             -1 * COM_FIX_FRACUNIT);
 
-  com_pnt_t uv0 = com_pnt_from(0 * COM_FIX_FRACUNIT, 0 * COM_FIX_FRACUNIT);
-  com_pnt_t uv1 = com_pnt_from(1 * COM_FIX_FRACUNIT, 0 * COM_FIX_FRACUNIT);
-  com_pnt_t uv2 = com_pnt_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT);
-  com_pnt_t uv3 = com_pnt_from(0 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT);
+  // com_pnt_t uv0 = com_pnt_from(0 * COM_FIX_FRACUNIT, 0 * COM_FIX_FRACUNIT);
+  // com_pnt_t uv1 = com_pnt_from(1 * COM_FIX_FRACUNIT, 0 * COM_FIX_FRACUNIT);
+  // com_pnt_t uv2 = com_pnt_from(1 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT);
+  // com_pnt_t uv3 = com_pnt_from(0 * COM_FIX_FRACUNIT, 1 * COM_FIX_FRACUNIT);
 
-  com_vec_t c0 = com_gem_vec_project_clip(mvp, v0);
-  com_vec_t c1 = com_gem_vec_project_clip(mvp, v1);
-  com_vec_t c2 = com_gem_vec_project_clip(mvp, v2);
-  com_vec_t c3 = com_gem_vec_project_clip(mvp, v3);
+  // com_vec_t c0 = com_gem_vec_project_clip(mvp, v0);
+  // com_vec_t c1 = com_gem_vec_project_clip(mvp, v1);
+  // com_vec_t c2 = com_gem_vec_project_clip(mvp, v2);
+  // com_vec_t c3 = com_gem_vec_project_clip(mvp, v3);
 
-  com_pnt_t p0, p1, p2, p3;
-  uint8_t cc0 = com_gem_clip_vis_project(c0, &p0);
-  uint8_t cc1 = com_gem_clip_vis_project(c1, &p1);
-  uint8_t cc2 = com_gem_clip_vis_project(c2, &p2);
-  uint8_t cc3 = com_gem_clip_vis_project(c3, &p3);
+  // com_pnt_t p0, p1, p2, p3;
+  // uint8_t cc0 = com_gem_clip_vis_project(c0, &p0);
+  // uint8_t cc1 = com_gem_clip_vis_project(c1, &p1);
+  // uint8_t cc2 = com_gem_clip_vis_project(c2, &p2);
+  // uint8_t cc3 = com_gem_clip_vis_project(c3, &p3);
 
-  com_std_printf("%i, %i\n", p0.a[0], p0.a[1]);
-  com_std_printf("%i, %i\n", p1.a[0], p1.a[1]);
-  com_std_printf("%i, %i\n", p2.a[0], p2.a[1]);
-  com_std_printf("%i, %i\n", p3.a[0], p3.a[1]);
+  // com_std_printf("%i, %i\n", p0.a[0], p0.a[1]);
+  // com_std_printf("%i, %i\n", p1.a[0], p1.a[1]);
+  // com_std_printf("%i, %i\n", p2.a[0], p2.a[1]);
+  // com_std_printf("%i, %i\n", p3.a[0], p3.a[1]);
 
-  uint8_t tex[32 * 32 * 3] = {0};
+  uint8_t _Alignas(16) tex[32 * 32 * 3] = {0};
   for (int y = 0; y < 32; ++y) {
     for (int x = 0; x < 32; ++x) {
       // uint32_t idx = com_zord_order(x, y);

Player/draw.h

@@ -4,5 +4,6 @@
 #include <stdint.h>
 
 extern void plr_draw_screen(uint8_t *pixel_buffer);
+extern uint8_t *plr_draw_get_pixel_buffer(void);
 
 #endif

Player/tiny.ld

@@ -14,19 +14,19 @@ SECTIONS
     *(.text*)
   }
 
-  .rodata : {
+  .rodata ALIGN(16) : {
     *(.rodata*)
   }
 
-  .data : {
+  .data ALIGN(16) : {
     *(.data*)
   }
 
-  .shstrtab : {
+  .shstrtab ALIGN(16) : {
     *(.shstrtab*)
   }
 
-  .bss : {
+  .bss ALIGN(16) : {
     *(.bss*)
     *(COMMON)
   }