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55 lines
1.1 KiB
GLSL
55 lines
1.1 KiB
GLSL
#include "core.h"
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#define ALPHA @shPropertyBool(shadow_transparency)
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#ifdef SH_VERTEX_SHADER
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SH_BEGIN_PROGRAM
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#if ALPHA
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shVertexInput(float2, uv0)
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shOutput(float2, UV)
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#endif
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shUniform(float4x4, wvp) @shAutoConstant(wvp, worldviewproj_matrix)
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shOutput(float2, depth)
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SH_START_PROGRAM
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{
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// this is the view space position
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shOutputPosition = shMatrixMult(wvp, shInputPosition);
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// depth info for the fragment.
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depth.x = shOutputPosition.z;
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depth.y = shOutputPosition.w;
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// clamp z to zero. seem to do the trick. :-/
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shOutputPosition.z = max(shOutputPosition.z, 0);
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#if ALPHA
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UV = uv0;
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#endif
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}
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#else
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SH_BEGIN_PROGRAM
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#if ALPHA
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shInput(float2, UV)
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shSampler2D(texture1)
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#endif
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shInput(float2, depth)
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SH_START_PROGRAM
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{
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float finalDepth = depth.x / depth.y;
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#if ALPHA
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// use alpha channel of the first texture
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float alpha = shSample(texture1, UV).a;
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if (alpha < 0.5)
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discard;
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#endif
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shOutputColour(0) = float4(finalDepth, finalDepth, finalDepth, 1);
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}
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#endif
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