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annotate src/system_sdl.c @ 16:ae58e7c3c328

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Poll events regularly to avoid unresponsive app warnings. Handle quit event
author Michael Pavone <pavone@retrodev.com>
date Sun, 27 Mar 2016 21:42:10 -0700
parents c8a0dbd7752c
children 41ec033ef8c3
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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 SDL_CreateWindowAndRenderer(width, height, 0, &window, &renderer);
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19 if (!window || !renderer) {
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20 fprintf(stderr, "Failed to create window or renderer: %s\n", SDL_GetError());
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21 return 0;
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22 }
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23 texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB444, SDL_TEXTUREACCESS_STREAMING, 320, 240);
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24 if (!texture) {
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25 fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError());
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26 SDL_DestroyRenderer(renderer);
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27 SDL_DestroyWindow(window);
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28 return 0;
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29 }
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30 return 1;
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31 }
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33 //Should be called once per frame to get a pointer to the output buffer at the start of rendering
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34 uint16_t *system_get_framebuffer(int *pitch)
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35 {
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36 void *pixels;
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37 if (SDL_LockTexture(texture, NULL, &pixels, pitch) < 0) {
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38 fprintf(stderr, "Failed to lock texture: %s\n", SDL_GetError());
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39 return NULL;
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40 }
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41 return pixels;
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42 }
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43
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44 //Should be called once per frame at the competion of rendering
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45 //The pointer returned by system_get_framebuffer should be discarded after calling this function
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46 void system_framebuffer_updated()
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47 {
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48 SDL_UnlockTexture(texture);
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49 SDL_RenderCopy(renderer, texture, NULL, NULL);
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50 SDL_RenderPresent(renderer);
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51 }
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52
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53 void system_poll_events()
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54 {
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55 SDL_Event event;
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56 while(SDL_PollEvent(&event))
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57 {
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58 switch (event.type)
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59 {
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60 case SDL_QUIT:
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61 exit(0);
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62 break;
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63 }
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64 }
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65 }
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