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float4 PixelShaderFunction(VertexShaderOutput input) : COLOR0 |
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{ |
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float4 output = 0; |
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//get normal data from the normalMap |
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float4 normalData = tex2D(normalSampler,input.TexCoord); |
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//tranform normal back into [-1,1] range |
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float3 normal = 2.0f * normalData.xyz - 1.0f; |
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//get specular power, and get it into [0,255] range] |
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float specularPower = normalData.a * 255; |
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//get specular intensity from the colorMap |
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float specularIntensity = tex2D(colorSampler, input.TexCoord).a; |
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//read depth |
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float depthVal = tex2D(depthSampler,input.TexCoord).r; |
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//compute screen-space position |
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float4 position; |
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position.x = input.TexCoord.x * 2.0f - 1.0f; |
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position.y = -(input.TexCoord.y * 2.0f - 1.0f); |
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position.z = depthVal; |
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position.w = 1.0f; |
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|
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//transform to world space |
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position = mul(position, InvertViewProjection); |
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position /= position.w; |
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//////////////////////////// |
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//surface-to-light vector |
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float3 lightVector = -normalize(lightDirection); |
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//compute diffuse light |
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float NdL = max(0,dot(normal,lightVector)); |
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float3 diffuseLight = Color.rgb * NdL; |
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//reflexion vector |
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float3 reflectionVector = normalize(reflect(lightVector, |
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normal)); |
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//camera-to-surface vector |
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float3 directionToCamera = normalize(cameraPosition - |
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position); |
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//compute specular light |
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float specularLight = specularIntensity * pow( saturate(dot(reflectionVector, |
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directionToCamera)), specularPower); |
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//----------------SpotLight----------------- |
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lightVector = lightPosition - position; |
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float attenuation = saturate(1.0f - length(lightVector)/lightRadius); |
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//normalize light vector |
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lightVector = normalize(lightVector); |
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//SpotDotLight = cosine of the angle between spotdirection and lightvector |
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lightDirection = normalize(lightDirection); |
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float SdL = dot(lightDirection,-lightVector); |
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output = (0,0,0,specularLight); |
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if (SdL > spotLightAngleCosine) |
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{ |
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float spotIntensity = pow(SdL,spotDecayExponent); |
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attenuation *= spotIntensity; |
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output.rgb = diffuseLight * attenuation * lightIntensity; |
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//multiply the attenuation by spotIntensity before applying it to the light |
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} |
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//----------------------------------------- |
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return output; |
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} |
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