Hi Guys, I have been having troubles with masks. This is the history: I setup two quads, one had a texture applied to it, and the second one had a black/white mask applied to it. That worked fine. Now i have modified the code so that the first quad does not have a texture applied, and i have given the quad a color with glcolor3f(1.0f,0.0f,0.0f). Now for some reason I get a blank screen instead of say red showing through the white part of the mask. The weird thing is if I leave IN the line :

	glBindTexture(GL_TEXTURE_2D, texture[0]); 

but dont apply the texture with glTexCoord2f, it works, ie:

	glBindTexture(GL_TEXTURE_2D, texture[0]);							
	glBegin(GL_QUADS);// Draw A Quad
	glColor3f(1.0f,0.0f,0.0f);
	glVertex3f(-1.0f, 1.0f, 0.0f);		// Top Left
	glVertex3f( 1.0f, 1.0f, 0.0f);		// Top Right
	glVertex3f( 1.0f,-1.0f, 0.0f);		// Bottom Right
	glVertex3f(-1.0f,-1.0f, 0.0f);		// Bottom Left
	glEnd();	

I dont see why I just cant have: glBegin(GL_QUADS);// Draw A Quad glColor3f(1.0f,0.0f,0.0f); glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left glEnd(); The full code is :

int DrawGLScene(GLvoid)									// Here's Where We Do All The Drawing
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	// Clear Screen And Depth Buffer
	glLoadIdentity();									// Reset The Current Modelview Matrix
	glTranslatef(0.0f,0.0f,-5.0f);	
	
	glBindTexture(GL_TEXTURE_2D, texture[0]);							
	glBegin(GL_QUADS);// Draw A Quad
	glColor3f(0.0f,1.0f,0.0f);
	glVertex3f(-1.0f, 1.0f, 0.0f);		// Top Left
	glVertex3f( 1.0f, 1.0f, 0.0f);		// Top Right
	glVertex3f( 1.0f,-1.0f, 0.0f);		// Bottom Right
	glVertex3f(-1.0f,-1.0f, 0.0f);		// Bottom Left
	glEnd();		

	glEnable(GL_BLEND);								// Enable Blending
	glDisable(GL_DEPTH_TEST);						// Disable Depth Testing
	glBlendFunc(GL_DST_COLOR,GL_ZERO);				// Blend Screen Color With Zero (Black)

	glBindTexture(GL_TEXTURE_2D, texture[1]);							// Move Right 3 Units
	glBegin(GL_QUADS);													// Draw A Quad
		glTexCoord2f(0.0f, 1.0f); glVertex3f(-2.0f, 2.0f, 0.0f);		// Top Left
		glTexCoord2f(1.0f, 1.0f); glVertex3f( 2.0f, 2.0f, 0.0f);		// Top Right
		glTexCoord2f(1.0f, 0.0f); glVertex3f( 2.0f,-2.0f, 0.0f);		// Bottom Right
		glTexCoord2f(0.0f, 0.0f); glVertex3f(-2.0f,-2.0f, 0.0f);		// Bottom Left
	glEnd();	

	glDisable(GL_BLEND);

	return TRUE;										// Keep Going
}

Cheers -Al

have you tried to disable the GL_TEXTURE_2D while rendering the red quad?
(you also need to disable the lighting or you use glColorMaterial...i dont know if you use lighting...