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progs/demos: added RGB invert option

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This commit is contained in:
Brian Paul
2009-09-08 16:45:07 -06:00
parent 126696caf7
commit 079ae4c38c
1 changed files with 22 additions and 0 deletions
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22
progs/demos/copypix.c
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@@ -26,6 +26,7 @@ static int Scissor = 0;
static float Xzoom, Yzoom;
static GLboolean DrawFront = GL_FALSE;
static GLboolean Dither = GL_TRUE;
static GLboolean Invert = GL_FALSE;
static void Reset( void )
@@ -59,6 +60,15 @@ static void Display( void )
if (Scissor)
glEnable(GL_SCISSOR_TEST);
if (Invert) {
glPixelTransferf(GL_RED_SCALE, -1.0);
glPixelTransferf(GL_GREEN_SCALE, -1.0);
glPixelTransferf(GL_BLUE_SCALE, -1.0);
glPixelTransferf(GL_RED_BIAS, 1.0);
glPixelTransferf(GL_GREEN_BIAS, 1.0);
glPixelTransferf(GL_BLUE_BIAS, 1.0);
}
/* draw copy */
glPixelZoom(Xzoom, Yzoom);
glWindowPos2iARB(Xpos, Ypos);
@@ -67,6 +77,15 @@ static void Display( void )
glDisable(GL_SCISSOR_TEST);
if (Invert) {
glPixelTransferf(GL_RED_SCALE, 1.0);
glPixelTransferf(GL_GREEN_SCALE, 1.0);
glPixelTransferf(GL_BLUE_SCALE, 1.0);
glPixelTransferf(GL_RED_BIAS, 0.0);
glPixelTransferf(GL_GREEN_BIAS, 0.0);
glPixelTransferf(GL_BLUE_BIAS, 0.0);
}
if (DrawFront)
glFinish();
else
@@ -105,6 +124,9 @@ static void Key( unsigned char key, int x, int y )
else
glDisable(GL_DITHER);
break;
case 'i':
Invert = !Invert;
break;
case 's':
Scissor = !Scissor;
break;