/*******************************************************************************
 *
 * Description:
 *		Sample GLSL FX file.
 *		Takes 2 color sets in from the input data and does a blend based
 *		on the "blend" uniform.
 *
 *******************************************************************************/

// We are using GLSL vs HLSL
#pragma language GLSL

uniform int blend;
varying vec3 colorVector;
varying vec3 colorVector1;

void cpvShaderVertex()
{
	// Position in screen space.
	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
	
	// pass texture coordinates as color vector
	colorVector = gl_MultiTexCoord1.xyz;
	colorVector1 = gl_MultiTexCoord2.xyz;
}

void cpvShaderPixel()
{
	if (blend == 0)
		gl_FragColor = vec4( colorVector*colorVector1, 1.0);
	else if (blend == 1)
		gl_FragColor = vec4( (colorVector+colorVector1) / 2.0, 1.0);
	else if (blend == 2)
		gl_FragColor = vec4( (colorVector+colorVector1), 1.0);
	else if (blend == 3)
		gl_FragColor = vec4( (colorVector-colorVector1), 1.0);
	else if (blend == 4)
		gl_FragColor = vec4( colorVector, 1.0);
	else
		gl_FragColor = vec4( colorVector1, 1.0);
}


//////// techniques ////////////////////////////

// Technique to display tangents
technique cpvBlend
{
	pass p0
	{
		VertexShader = compile vs_2_0 cpvShaderVertex();		
		ZEnable = true;
		ZWriteEnable = true;
        ZFunc = LEqual;
		CullMode = None;
		PixelShader = compile ps_2_0 cpvShaderPixel();
	}
}