// Copyright (c) 2008 the OpenTK Team. See license.txt for legal bla // Material uniforms uniform sampler2D Material_DiffuseAndHeight; uniform sampler2D Material_NormalAndGloss; uniform vec3 Material_ScaleBiasShininess; // x=Scale, y=Bias, z=Shininess // Light uniforms uniform vec3 Light_DiffuseColor; uniform vec3 Light_SpecularColor; // from VS varying vec3 VaryingLightVector; varying vec3 VaryingEyeVector; vec3 normal; void main() { vec3 lightVector = normalize( VaryingLightVector ); vec3 eyeVector = normalize( VaryingEyeVector ); // first, find the parallax displacement by reading only the height map float parallaxOffset = texture2D( Material_DiffuseAndHeight, gl_TexCoord[0].st ).a * Material_ScaleBiasShininess.x - Material_ScaleBiasShininess.y; vec2 newTexCoords = gl_TexCoord[0].st + ( parallaxOffset * eyeVector.xy ); // displace texcoords according to viewer // knowing the displacement, read RGB, Normal and Gloss vec3 diffuseColor = texture2D( Material_DiffuseAndHeight, newTexCoords.st ).rgb; vec4 temp = texture2D( Material_NormalAndGloss, newTexCoords.st ); // build a usable normal vector normal.xy = temp.ag * 2.0 - 1.0; // swizzle alpha and green to x/y and scale to [-1..+1] normal.z = sqrt( 1.0 - normal.x*normal.x - normal.y*normal.y ); // z = sqrt(1-x^2-y^2) // move other properties to be better readable float gloss = temp.r; // float alpha = temp.b; // if ( alpha < 0.2 ) // optimization: should move this test before reading RGB texture // discard; // tweaked phong lighting float lambert = max( dot( lightVector, normal ), 0.0 ); gl_FragColor = vec4( Light_DiffuseColor * diffuseColor, 1.0 ) * lambert; if ( lambert > 0.0 ) { float specular = pow( clamp( dot( reflect( -lightVector, normal ), eyeVector ), 0.0, 1.0 ), Material_ScaleBiasShininess.z ); gl_FragColor += vec4( Light_SpecularColor * diffuseColor, 1.0 ) * ( specular * gloss ); } }