43 строки
1.4 KiB
C++
43 строки
1.4 KiB
C++
#include <stdio.h>
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#include <SDL/SDL.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten.h>
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#endif
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extern "C" int main(int argc, char** argv) {
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printf("hello, world!\n");
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SDL_Init(SDL_INIT_VIDEO);
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SDL_Surface *screen = SDL_SetVideoMode(256, 256, 32, SDL_SWSURFACE);
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#ifdef TEST_SDL_LOCK_OPTS
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EM_ASM("SDL.defaults.copyOnLock = false; SDL.defaults.discardOnLock = true; SDL.defaults.opaqueFrontBuffer = false;");
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#endif
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if (SDL_MUSTLOCK(screen)) SDL_LockSurface(screen);
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for (int i = 0; i < 256; i++) {
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for (int j = 0; j < 256; j++) {
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#ifdef TEST_SDL_LOCK_OPTS
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// Alpha behaves like in the browser, so write proper opaque pixels.
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int alpha = 255;
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#else
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// To emulate native behavior with blitting to screen, alpha component is ignored. Test that it is so by outputting
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// data (and testing that it does get discarded)
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int alpha = (i+j) % 255;
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#endif
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*((Uint32*)screen->pixels + i * 256 + j) = SDL_MapRGBA(screen->format, i, j, 255-i, alpha);
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}
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}
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if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
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SDL_Flip(screen);
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printf("you should see a smoothly-colored square - no sharp lines but the square borders!\n");
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printf("and here is some text that should be HTML-friendly: amp: |&| double-quote: |\"| quote: |'| less-than, greater-than, html-like tags: |<cheez></cheez>|\nanother line.\n");
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SDL_Quit();
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return 0;
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}
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