-
Notifications
You must be signed in to change notification settings - Fork 0
/
canvas.cpp
38 lines (31 loc) · 1.05 KB
/
canvas.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
// Copyright 2011 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <stdio.h>
#include <SDL/SDL.h>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
extern "C" int main(int argc, char** argv) {
SDL_Init(SDL_INIT_VIDEO);
SDL_Surface *screen = SDL_SetVideoMode(256, 256, 32, SDL_SWSURFACE);
#ifdef TEST_SDL_LOCK_OPTS
EM_ASM("SDL.defaults.copyOnLock = false; SDL.defaults.discardOnLock = true; SDL.defaults.opaqueFrontBuffer = false;");
#endif
if (SDL_MUSTLOCK(screen)) SDL_LockSurface(screen);
for (int i = 0; i < 256; i++) {
for (int j = 0; j < 256; j++) {
#ifdef TEST_SDL_LOCK_OPTS
int alpha = 255;
#else
int alpha = (i+j) % 255;
#endif
*((Uint32*)screen->pixels + i * 256 + j) = SDL_MapRGBA(screen->format, i, j, 255-i, alpha);
}
}
if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
SDL_Flip(screen);
SDL_Quit();
return 0;
}