ShaderShadow

EP0-TS2
0xCD7FE87A
0x1C0532FA
0xD2989BDE
0xFF03CFFC
# shadow

#
# Various shaders for rendering shadows
#



# want to draw the shadow proper after standard opaque stuff.
seti simShadowLayer 1

# Enable to see the shadow more clearly.
setb simShadowDebug false


# --- Sim Shadow shader for the main render --------------------------------------------------------

define ShadowShader()
   material
      shader -layer ($simShadowLayer * 4)
         vertexFormatPred position 0 true
         vertexFormatPred texcoord 0 true

         pass -fixedFunction
            create LightingStatesNoStdLights()
            
            ffMatCoef -amb $stdMatDiffCoef -diff $stdMatDiffCoef -emit $stdMatEmissiveCoef -spec $stdMatSpecCoef -specPow $stdMatSpecPower
            addSpecular false

            if ($simShadowDebug)
               alphaBlend srcFactor(one) add dstFactor(zero)
            else
               alphaBlend srcFactor(destColor) add dstFactor(zero)
            endif
            
            depthTest true -enableDepthWrite false
            fillmode $stdMatFillMode

            stage
               texture $stdMatBaseTextureName
               textureAddressing clamp clamp clamp
               textureMIPFilterHint disabled
               ffTextureCoordsSource 0
               textureBlend select(texture) select(texture)
            end 
         end
      end
   end
enddef

# First pass at material for projective shadow texturing
setc shadowColor (0.5, 0.5, 0.7)
setf shadowStrength 0.8
define ProjectiveShadowDef()
   material
      shader -layer 0
         vertexFormatPred position 0 true

         pass -fixedFunction
            create LightingStatesNoStdLights()
            
            addSpecular false

            alphaBlend srcFactor(one) add dstFactor(invSrcAlpha)
            
            fillmode $stdMatFillMode

            colorScalar $shadowColor $shadowStrength
            tsUserLight projectiveTextureLight 0

            stage
               texture reggrid2
               textureAddressing clamp clamp
               textureMIPFilterHint disabled
               textureBlend multiply(colorScalar texture:alphaReplicate) multiply(colorScalar texture)
            end 
            
            # apply mask to prevent repeat off to infinity.
            stage
               texture overlayMask
               textureFilterHint point point
               textureAddressing clamp clamp
               textureBlend select(outRegister) multiply(texture outRegister)
            end
         end
      end
   end
enddef
 

materialDefinition ProjectiveShadow
   setDefinition ProjectiveShadowDef
end

# Called by code to create this material, to avoid referencing
# tsUserLight if not necessary.
define FamilyThumbnailShadowMaterial()
   materialDefinition FamilyThumbnailShadow
      setDefinition ProjectiveShadowDef
      addParam shadowColor (0, 0, 0)
      addParam shadowStrength 0.50
      # read by code:
      addParam lightDirection (0.2, 1, 2)
   end
enddef