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4faa1bf3e8
Don't use FFP-friendly texture image units for shadow maps Closes #7102 See merge request OpenMW/openmw!2682
49 lines
1.9 KiB
GLSL
49 lines
1.9 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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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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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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} |