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47 lines
1.6 KiB
GLSL
47 lines
1.6 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 mat4 shadowSpaceMatrix@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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vec4 shadowOffset;
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@foreach shadow_texture_unit_index @shadow_texture_unit_list
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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 = shadowSpaceMatrix@shadow_texture_unit_index * viewPos;
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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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vec4 lightSpaceXY = viewPos + shadowOffset;
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lightSpaceXY = shadowSpaceMatrix@shadow_texture_unit_index * lightSpaceXY;
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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 = shadowSpaceMatrix@shadow_texture_unit_index * offsetViewPosition;
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}
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#endif
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@endforeach
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#endif // SHADOWS
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}
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