townengine/src/util.c

#include "util.h"
#include "context.h"

#include <SDL2/SDL.h>
#include <physfsrwops.h>
#define STB_DS_IMPLEMENTATION
#define STBDS_ASSERT SDL_assert
#define STBDS_REALLOC(c,p,s) crealloc(p, s)
#define STBDS_FREE(c,p) free(p)
#include <stb_ds.h>
#define STB_RECT_PACK_IMPLEMENTATION
#define STBRP_ASSERT SDL_assert
#include <stb_rect_pack.h>

#include <stdlib.h>
#include <stdarg.h>
#include <stdnoreturn.h>
#include <string.h>


void cry_impl(const char *file, const int line, const char *title, const char *text) {
    SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION,
                    "TEARS AT %s:%d: %s ... %s", file, line, title, text);
    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title, text, NULL);
}


static void log_impl(const char *restrict format, va_list args, SDL_LogPriority priority) {
    SDL_LogMessageV(SDL_LOG_CATEGORY_APPLICATION,
                    priority,
                    format,
                    args);
}


void log_info(const char *restrict format, ...) {
    va_list args;
    va_start(args, format);
    log_impl(format, args, SDL_LOG_PRIORITY_INFO);
    va_end(args);
}


void log_critical(const char *restrict format, ...) {
    va_list args;
    va_start(args, format);
    log_impl(format, args, SDL_LOG_PRIORITY_CRITICAL);
    va_end(args);
}


void log_warn(const char *restrict format, ...) {
    va_list args;
    va_start(args, format);
    log_impl(format, args, SDL_LOG_PRIORITY_WARN);
    va_end(args);
}


noreturn static void alloc_failure_death(void) {
    log_critical("Allocation failure. Aborting NOW.");
    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
                             "MEMORY ALLOCATION FAILURE.",
                             "FAILED TO ALLOCATE MEMORY. "
                             "YOU MIGHT BE UNLUCKY. "
                             "THE GAME WILL EXIT NOW.",
                             NULL);

    die_abruptly();
}


noreturn void die_abruptly(void) {
    /* a zombie window will linger if we don't at least try to quit SDL */
    SDL_Quit();
    abort();
}


void *cmalloc(size_t size) {
    void *ptr = malloc(size);
    if (ptr == NULL)
        alloc_failure_death();
    return ptr;
}


void *crealloc(void *ptr, size_t size) {
    void *out = realloc(ptr, size);
    if (out == NULL)
        alloc_failure_death();
    return out;
}


void *ccalloc(size_t num, size_t size) {
    void *ptr = calloc(num, size);
    if (ptr == NULL)
        alloc_failure_death();
    return ptr;
}


int64_t file_to_bytes(const char *path, unsigned char **buf_out) {
    SDL_RWops *handle = PHYSFSRWOPS_openRead(path);

    if (handle == NULL) {
        return -1;
    }

    int64_t data_size = SDL_RWseek(handle, 0, RW_SEEK_END);
    SDL_RWseek(handle, 0, RW_SEEK_SET); /* reset offset into data */

    *buf_out = cmalloc(data_size);
    SDL_RWread(handle, *buf_out, sizeof **buf_out, data_size / sizeof **buf_out);
    SDL_RWclose(handle);    /* we got all we needed from the stream */

    return data_size;
}


char *file_to_str(const char *path) {
    SDL_RWops *handle = PHYSFSRWOPS_openRead(path);

    if (handle == NULL) {
        return NULL;
    }

    int64_t data_size = SDL_RWseek(handle, 0, RW_SEEK_END);
    SDL_RWseek(handle, 0, RW_SEEK_SET); /* reset offset into data */

    char *str_out = cmalloc(data_size + 1); /* data plus final null */
    size_t len = data_size / sizeof *str_out;

    SDL_RWread(handle, str_out, sizeof *str_out, len);
    SDL_RWclose(handle);    /* we got all we needed from the stream */

    str_out[len] = '\0'; 

    return str_out;
}


bool strends(const char *str, const char *suffix) {
    size_t str_length = strlen(str);
    size_t suffix_length = strlen(suffix);

    if (suffix_length >  str_length)
        return false;
    
    return memcmp((str + str_length) - suffix_length, suffix, suffix_length) == 0;
}


bool intersect_rect(const t_rect *a, const t_rect *b, t_rect *result) {
    SDL_Rect a_sdl = { a->x, a->y, a->w, a->h };
    SDL_Rect b_sdl = { b->x, b->y, b->w, b->h };
    SDL_Rect result_sdl = { 0 };

    bool intersection = SDL_IntersectRect(&a_sdl, &b_sdl, &result_sdl);

    *result = (t_rect){ result_sdl.x, result_sdl.y, result_sdl.w, result_sdl.h };
    return intersection;
}


bool intersect_frect(const t_frect *a, const t_frect *b, t_frect *result) {
    SDL_FRect a_sdl = { a->x, a->y, a->w, a->h };
    SDL_FRect b_sdl = { b->x, b->y, b->w, b->h };
    SDL_FRect result_sdl = { 0 };

    bool intersection = SDL_IntersectFRect(&a_sdl, &b_sdl, &result_sdl);

    *result = (t_frect){ result_sdl.x, result_sdl.y, result_sdl.w, result_sdl.h };
    return intersection;
}


t_frect to_frect(t_rect rect) {
    return (t_frect) {
        .h = (float)rect.h,
        .w = (float)rect.w,
        .x = (float)rect.x,
        .y = (float)rect.y,
    };
}


t_fvec2 frect_center(t_frect rect) {
    return (t_fvec2){
        .x = rect.x + rect.w / 2,
        .y = rect.y + rect.h / 2,
    };
}


t_fvec2 fvec2_from_vec2(t_vec2 vec) {
    return (t_fvec2) {
        .x = (float)vec.x,
        .y = (float)vec.y,
    };
}

t_fvec2 fvec2_from_shvec2(t_shvec2 vec) {
    return (t_fvec2) {
        .x = (float)vec.x,
        .y = (float)vec.y,
    };
}


void tick_timer(int *value) {
    *value = MAX(*value - 1, 0);
}

void tick_ftimer(float *value) {
    *value = MAX(*value - ((float)ctx.delta_time / (float)ctx.clocks_per_second), 0.0f);
}

bool repeat_ftimer(float *value, float at) {
    *value -= (float)ctx.delta_time / (float)ctx.clocks_per_second;
    if (*value < 0.0f) {
        *value += at;
        return true;
    }
    return false;
}