45 lines
1.4 KiB
GLSL
45 lines
1.4 KiB
GLSL
#version 120
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uniform bool shadows_enabled;
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uniform mat4 fg_LightMatrix_csm0;
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uniform mat4 fg_LightMatrix_csm1;
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uniform mat4 fg_LightMatrix_csm2;
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uniform mat4 fg_LightMatrix_csm3;
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varying vec4 lightSpacePos[4];
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const float NORMAL_OFFSET_SCALES[4] = float[4](0.0, 0.1, 0.3, 1.0);
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void setupShadows(vec4 eyeSpacePos)
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{
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if (!shadows_enabled)
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return;
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vec3 normal = gl_NormalMatrix * gl_Normal;
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vec3 toLight = normalize(gl_LightSource[0].position.xyz);
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float costheta = dot(normal, toLight);
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float slopeScale = clamp(1.0 - costheta, 0.0, 1.0);
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vec4 offsetPos[4];
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for (int i = 0; i < 4; i++) {
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float normalOffset = NORMAL_OFFSET_SCALES[i] * slopeScale;
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offsetPos[i] = eyeSpacePos + vec4(normal * normalOffset, 0.0);
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}
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vec4 offsetPosLightSpace[4];
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offsetPosLightSpace[0] = fg_LightMatrix_csm0 * offsetPos[0];
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offsetPosLightSpace[1] = fg_LightMatrix_csm1 * offsetPos[1];
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offsetPosLightSpace[2] = fg_LightMatrix_csm2 * offsetPos[2];
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offsetPosLightSpace[3] = fg_LightMatrix_csm3 * offsetPos[3];
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lightSpacePos[0] = fg_LightMatrix_csm0 * eyeSpacePos;
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lightSpacePos[1] = fg_LightMatrix_csm1 * eyeSpacePos;
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lightSpacePos[2] = fg_LightMatrix_csm2 * eyeSpacePos;
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lightSpacePos[3] = fg_LightMatrix_csm3 * eyeSpacePos;
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// Offset only in UV space
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for (int i = 0; i < 4; i++)
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lightSpacePos[i].xy = offsetPosLightSpace[i].xy;
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}
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