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comparison src/system_sdl.c @ 15:c8a0dbd7752c

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Forgot to commit SDL code
author Michael Pavone <pavone@retrodev.com>
date Sun, 27 Mar 2016 21:31:34 -0700
parents
children ae58e7c3c328
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14:769120da2c1f 15:c8a0dbd7752c
1 #include <SDL.h>
2 #include <stdint.h>
3
4
5 SDL_Window *window;
6 SDL_Renderer *renderer;
7 SDL_Texture *texture;
8
9 int system_init(int width, int height)
10 {
11 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
12 fprintf(stderr, "Failed to init SDL: %s\n", SDL_GetError());
13 return 0;
14 }
15 atexit(SDL_Quit);
16 SDL_CreateWindowAndRenderer(width, height, 0, &window, &renderer);
17
18 if (!window || !renderer) {
19 fprintf(stderr, "Failed to create window or renderer: %s\n", SDL_GetError());
20 return 0;
21 }
22 texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB444, SDL_TEXTUREACCESS_STREAMING, 320, 240);
23 if (!texture) {
24 fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError());
25 SDL_DestroyRenderer(renderer);
26 SDL_DestroyWindow(window);
27 return 0;
28 }
29 return 1;
30 }
31
32 //Should be called once per frame to get a pointer to the output buffer at the start of rendering
33 uint16_t *system_get_framebuffer(int *pitch)
34 {
35 void *pixels;
36 if (SDL_LockTexture(texture, NULL, &pixels, pitch) < 0) {
37 fprintf(stderr, "Failed to lock texture: %s\n", SDL_GetError());
38 return NULL;
39 }
40 return pixels;
41 }
42
43 //Should be called once per frame at the competion of rendering
44 //The pointer returned by system_get_framebuffer should be discarded after calling this function
45 void system_framebuffer_updated()
46 {
47 SDL_UnlockTexture(texture);
48 SDL_RenderCopy(renderer, texture, NULL, NULL);
49 SDL_RenderPresent(renderer);
50 }
51