source: data/branches/Shader_HS18/programs/Cg/Instancing_ps.cg @ 12115

//---------------------------------------------------------------------------
//These materials/shaders are part of the NEW InstanceManager implementation
//Written by Matias N. Goldberg ("dark_sylinc")
//---------------------------------------------------------------------------

#include "InstancingVertexInterpolators.cg"

#include "shadows.cg"

//---------------------------------------------
//Main Pixel Shader
//---------------------------------------------
half4 main_ps( PS_INPUT input ,
                                uniform float4  lightPosition,
                                uniform float3  cameraPosition,
                                uniform half3   lightAmbient,
                                uniform half3   lightDiffuse,
                                uniform half3   lightSpecular,
                                uniform half4   lightAttenuation,
                                uniform half    lightGloss,

                                //Textures
                                uniform sampler2D diffuseMap : register(s0)

#ifdef DEPTH_SHADOWRECEIVER
                        ,       uniform float invShadowMapSize,
                                uniform sampler2D shadowMap : register(s1)
#endif
                        ) : COLOR0
{
        float fShadow = 1.0f;
#ifdef DEPTH_SHADOWRECEIVER
        fShadow = calcDepthShadow( shadowMap, input.lightSpacePos, invShadowMapSize );
#endif

        const half4 baseColour = tex2D( diffuseMap, input.uv0 );
        
        //Blinn-Phong lighting
        const half3 normal              = normalize( input.Normal );
        half3 lightDir                  = lightPosition.xyz - input.vPos * lightPosition.w;
        half3 eyeDir                    = normalize( cameraPosition - input.vPos  );

        const half fLength              = length( lightDir );
        lightDir                                = normalize( lightDir );

        const half NdotL = max( 0.0f, dot( normal, lightDir ) );
        half3 halfVector = normalize(lightDir + eyeDir);
        const half HdotN = max( 0.0f, dot( halfVector, normal ) );
        
        const half3 ambient  = lightAmbient * baseColour.xyz;
        const half3 diffuse  = lightDiffuse * NdotL * baseColour.xyz;
        const half3 specular = lightSpecular * pow( HdotN, lightGloss );
        
        const half3 directLighting = (diffuse + specular) * fShadow;
        
        return half4( directLighting + ambient, baseColour.a );
}