diff options
Diffstat (limited to 'progs/fp/fp-tri.c')
| -rw-r--r-- | progs/fp/fp-tri.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/progs/fp/fp-tri.c b/progs/fp/fp-tri.c index 1598739c576..bc490c05201 100644 --- a/progs/fp/fp-tri.c +++ b/progs/fp/fp-tri.c @@ -125,6 +125,57 @@ static void Init( void ) exit(1); } + + glGenTextures(1, &Texture); + glActiveTextureARB(GL_TEXTURE0_ARB + 1); + glBindTexture(GL_TEXTURE_2D, Texture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + + { + GLubyte data[32][32]; + int width = 32; + int height = 32; + int i; + int j; + + for (i = 0; i < 32; i++) + for (j = 0; j < 32; j++) + { + /** + ** +-----------+ + ** | W | + ** | +-----+ | + ** | | | | + ** | | B | | + ** | | | | + ** | +-----+ | + ** | | + ** +-----------+ + **/ + int i2 = i - height / 2; + int j2 = j - width / 2; + int h8 = height / 8; + int w8 = width / 8; + if ( -h8 <= i2 && i2 <= h8 && -w8 <= j2 && j2 <= w8 ) { + data[i][j] = 0x00; + } else if ( -2 * h8 <= i2 && i2 <= 2 * h8 && -2 * w8 <= j2 && j2 <= 2 * w8 ) { + data[i][j] = 0x55; + } else if ( -3 * h8 <= i2 && i2 <= 3 * h8 && -3 * w8 <= j2 && j2 <= 3 * w8 ) { + data[i][j] = 0xaa; + } else { + data[i][j] = 0xff; + } + } + + glTexImage2D( GL_TEXTURE_2D, 0, + GL_ALPHA8, + 32, 32, 0, + GL_ALPHA, GL_UNSIGNED_BYTE, data ); + } + + glClearColor(.1, .3, .5, 0); } |