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53 lines
2.1 KiB
GLSL
53 lines
2.1 KiB
GLSL
#define SHADOWS @shadows_enabled
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#if SHADOWS
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@foreach shadow_texture_unit_index @shadow_texture_unit_list
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uniform int shadowTextureUnit@shadow_texture_unit_index;
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varying vec4 shadowSpaceCoords@shadow_texture_unit_index;
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#if @perspectiveShadowMaps
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uniform mat4 validRegionMatrix@shadow_texture_unit_index;
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varying vec4 shadowRegionCoords@shadow_texture_unit_index;
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#endif
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@endforeach
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// Enabling this may reduce peter panning. Probably unnecessary.
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const bool onlyNormalOffsetUV = false;
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#endif // SHADOWS
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void setupShadowCoords(vec4 viewPos, vec3 viewNormal)
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{
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#if SHADOWS
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// This matrix has the opposite handedness to the others used here, so multiplication must have the vector to the left. Alternatively it could be transposed after construction, but that's extra work for the GPU just to make the code look a tiny bit cleaner.
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mat4 eyePlaneMat;
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vec4 shadowOffset;
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@foreach shadow_texture_unit_index @shadow_texture_unit_list
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eyePlaneMat = mat4(gl_EyePlaneS[shadowTextureUnit@shadow_texture_unit_index], gl_EyePlaneT[shadowTextureUnit@shadow_texture_unit_index], gl_EyePlaneR[shadowTextureUnit@shadow_texture_unit_index], gl_EyePlaneQ[shadowTextureUnit@shadow_texture_unit_index]);
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#if @perspectiveShadowMaps
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shadowRegionCoords@shadow_texture_unit_index = validRegionMatrix@shadow_texture_unit_index * viewPos;
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#endif
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#if @disableNormalOffsetShadows
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shadowSpaceCoords@shadow_texture_unit_index = viewPos * eyePlaneMat;
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#else
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shadowOffset = vec4(viewNormal * @shadowNormalOffset, 0.0);
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if (onlyNormalOffsetUV)
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{
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shadowSpaceCoords@shadow_texture_unit_index = viewPos * eyePlaneMat;
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vec4 lightSpaceXY = viewPos + shadowOffset;
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lightSpaceXY = lightSpaceXY * eyePlaneMat;
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shadowSpaceCoords@shadow_texture_unit_index.xy = lightSpaceXY.xy;
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}
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else
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{
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vec4 offsetViewPosition = viewPos + shadowOffset;
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shadowSpaceCoords@shadow_texture_unit_index = offsetViewPosition * eyePlaneMat;
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}
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#endif
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@endforeach
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#endif // SHADOWS
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} |