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uniform sampler2D ColorTex; //guess what :P
uniform sampler2D NormalTex; //view space normal.xy
uniform sampler2D DepthTex; //view space depth
uniform vec3 Direction;
uniform vec3 Color;
void main()
{
vec4 vNormal= texture2D(NormalTex, gl_TexCoord[0].xy);
//reconstruct normal
vNormal.xy*= 2.0;
vNormal.xy-= 1.0;
vNormal.z= -sqrt( -(vNormal.x*vNormal.x) - (vNormal.y*vNormal.y) + 1.0 );
//calculate the light
vec4 lightDir= vec4(normalize(Direction), 0.0);
float NdotL = max(dot(normalize(vNormal), lightDir), 0.0);
// Temp fix of the bug of the dot product at angle 90degree.
// This is useful for Phong shade and 1/2 vector calculation.
float rim = pow(1.0 - NdotL, 4.0); //Use the power constant 2,3... //Smaller power for softer light shadow.
vec4 Diffuse = vec4(Color,0.0)*texture2D(ColorTex, gl_TexCoord[0].xy);
gl_FragColor= rim*Diffuse;
}
Why don't we merge ambient with directional? Or can we access Ambient light data inside directional light?
Regards
thanh
Attempting to merge ambient end directional would result in some special cases that would be painful to handle 
