veclavtlica
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <X11/X.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include "display.h"
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bool quited = false;
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#define WIDTH 640
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#define HEIGHT 480
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// TODO: correct error handling.
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extern int plr_display_x11_main(int argc, char *argv[])
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{
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Display *display = XOpenDisplay(NULL);
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if (NULL == display) {
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fprintf(stderr, "Failed to initialize display");
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return EXIT_FAILURE;
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}
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Window root = DefaultRootWindow(display);
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if (None == root) {
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fprintf(stderr, "No root window found");
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XCloseDisplay(display);
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return EXIT_FAILURE;
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}
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int screen = DefaultScreen(display);
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Visual *visual = DefaultVisual(display, screen);
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int depth = DefaultDepth(display, screen);
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Window window = XCreateSimpleWindow(display, root, 0, 0, WIDTH, HEIGHT, 0, 0, 0xffffffff);
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if (None == window) {
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fprintf(stderr, "Failed to create window");
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XCloseDisplay(display);
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return EXIT_FAILURE;
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}
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XSizeHints *hints = XAllocSizeHints();
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if (hints == NULL) return EXIT_FAILURE;
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// Pinning min and max to the same values disables resizing
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hints->flags = PMinSize | PMaxSize;
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hints->min_width = hints->max_width = WIDTH;
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hints->min_height = hints->max_height = HEIGHT;
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XSetWMNormalHints(display, window, hints);
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XFree(hints);
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XSelectInput(display, window, ExposureMask | KeyPressMask);
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XMapWindow(display, window);
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GC gc = XCreateGC(display, window, 0, NULL);
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Atom wm_delete_window = XInternAtom(display, "WM_DELETE_WINDOW", False);
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XSetWMProtocols(display, window, & wm_delete_window, 1);
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// TODO: can't be not true
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int bytes_per_pixel = 4;
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char *pixel_buffer = (char *)malloc(WIDTH * HEIGHT * bytes_per_pixel);
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XImage *ximage = XCreateImage(
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display, visual, depth, ZPixmap, 0,
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pixel_buffer, WIDTH, HEIGHT, 32, 0
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);
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if (!ximage) {
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fprintf(stderr, "Failed to create XImage\n");
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free(pixel_buffer);
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XCloseDisplay(display);
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return EXIT_FAILURE;
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}
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int frame = 0;
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XEvent event;
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while (!quited) {
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XNextEvent(display, &event);
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switch(event.type) {
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case ClientMessage:
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if(event.xclient.data.l[0] == wm_delete_window) {
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XDestroyWindow(display, window);
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quited = true;
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}
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break;
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case Expose:
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frame += 2;
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// Fill buffer with a simple color gradient
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for (int y = 0; y < HEIGHT; y++) {
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for (int x = 0; x < WIDTH; x++) {
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int pixel_index = (y * WIDTH + x) * bytes_per_pixel;
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// Assuming standard Little-Endian 32-bit BGRA format
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pixel_buffer[pixel_index + 0] = (x + frame) % 256; // Blue
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pixel_buffer[pixel_index + 1] = (y + frame) % 256; // Green
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pixel_buffer[pixel_index + 2] = (x + y - frame) % 256; // Red
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pixel_buffer[pixel_index + 3] = 0; // Alpha/Padding
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}
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}
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// Draw the complete image onto the window when exposed
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XPutImage(
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display,
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window, // Target drawable
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gc, // Graphics Context
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ximage, // Source XImage
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0, 0, // Source coordinates (x, y)
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0, 0, // Destination coordinates (x, y)
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WIDTH, HEIGHT// Dimensions to copy
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);
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break;
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}
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}
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XCloseDisplay(display);
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return 0;
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}
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