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progs/trivial: Make quad-tex-sub repeat patterns

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This commit is contained in:
Jakob Bornecrantz 2009-03-18 17:24:40 +01:00
parent 4c460cfd2b
commit 3f17030d9c
1 changed files with 12 additions and 7 deletions
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19
progs/trivial/quad-tex-sub.c
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@ -43,17 +43,17 @@ static void MakeImage()
for (s = 0; s < SIZE; s++) { for (s = 0; s < SIZE; s++) {
for (t = 0; t < SIZE; t++) { for (t = 0; t < SIZE; t++) {
tex2d[s][t][0] = s*255/(SIZE-1); tex2d[t][s][0] = s*255/(SIZE-1);
tex2d[s][t][1] = t*255/(SIZE-1); tex2d[t][s][1] = t*255/(SIZE-1);
tex2d[s][t][2] = 0*255/(SIZE-1); tex2d[t][s][2] = 0*255/(SIZE-1);
} }
} }
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
SIZE, SIZE, SIZE, SIZE,
0, 0,
GL_RGB, GL_UNSIGNED_BYTE, tex2d); GL_RGB, GL_UNSIGNED_BYTE, tex2d);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4); glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glEnable(GL_TEXTURE_2D); glEnable(GL_TEXTURE_2D);
} }
@ -61,14 +61,19 @@ static void MakeImage()
static void UpdateLine() static void UpdateLine()
{ {
GLubyte tex[SIZE][3]; GLubyte tex[SIZE][3];
GLubyte b = 0;
GLint s, t; GLint s, t;
t = line % SIZE; t = line % SIZE;
if (line % (SIZE * 2) < SIZE)
b = 255;
else
b = 0;
for (s = 0; s < SIZE; s++) { for (s = 0; s < SIZE; s++) {
tex[s][0] = s*255/(SIZE-1); tex[s][0] = s*255/(SIZE-1);
tex[s][1] = t*255/(SIZE-1); tex[s][1] = t*255/(SIZE-1);
tex[s][2] = 255; tex[s][2] = b;
} }
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glPixelStorei(GL_UNPACK_ALIGNMENT, 1);