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annotate src/system_sdl.c @ 17:41ec033ef8c3

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Enable vsync
author Michael Pavone <pavone@retrodev.com>
date Sun, 27 Mar 2016 21:54:13 -0700
parents ae58e7c3c328
children 4c9dbfa30a66
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1 #include <SDL.h>
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2 #include <stdint.h>
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3 #include <stdlib.h>
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6 SDL_Window *window;
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7 SDL_Renderer *renderer;
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8 SDL_Texture *texture;
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9
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10 int system_init(int width, int height)
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11 {
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12 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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13 fprintf(stderr, "Failed to init SDL: %s\n", SDL_GetError());
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14 return 0;
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15 }
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16 atexit(SDL_Quit);
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17 window = SDL_CreateWindow("simple16", 0, 0, width, height, 0);
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18 if (!window) {
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19 fprintf(stderr, "Failed to create window: %s\n", SDL_GetError());
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20 return 0;
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21 }
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23 renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
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24 if (!renderer) {
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25 fprintf(stderr, "Failed to create renderer: %s\n", SDL_GetError());
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26 return 0;
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27 }
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29 texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB444, SDL_TEXTUREACCESS_STREAMING, 320, 240);
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30 if (!texture) {
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31 fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError());
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32 SDL_DestroyRenderer(renderer);
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33 SDL_DestroyWindow(window);
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34 return 0;
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35 }
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36 return 1;
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37 }
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39 //Should be called once per frame to get a pointer to the output buffer at the start of rendering
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40 uint16_t *system_get_framebuffer(int *pitch)
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41 {
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42 void *pixels;
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43 if (SDL_LockTexture(texture, NULL, &pixels, pitch) < 0) {
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44 fprintf(stderr, "Failed to lock texture: %s\n", SDL_GetError());
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45 return NULL;
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46 }
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47 return pixels;
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48 }
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49
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50 //Should be called once per frame at the competion of rendering
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51 //The pointer returned by system_get_framebuffer should be discarded after calling this function
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52 void system_framebuffer_updated()
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53 {
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54 SDL_UnlockTexture(texture);
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55 SDL_RenderCopy(renderer, texture, NULL, NULL);
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56 SDL_RenderPresent(renderer);
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57 }
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58
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59 void system_poll_events()
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60 {
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61 SDL_Event event;
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62 while(SDL_PollEvent(&event))
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63 {
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64 switch (event.type)
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65 {
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66 case SDL_QUIT:
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67 exit(0);
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68 break;
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69 }
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70 }
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71 }
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