32 lines
628 B
GLSL
32 lines
628 B
GLSL
#version 330 compatibility
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uniform sampler2D dtex;
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uniform mat4 ipvmat;
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uniform mat4 shadowmat;
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out vec3 wpos;
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out vec2 texc;
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float decdepth(vec4 rgba) {
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return dot(rgba, vec4(1.0, 1.0/255.0, 1.0/65025.0, 1.0/16581375.0));
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}
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void main()
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{
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texc = gl_Vertex.xy / vec2(32767.0);
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float z = decdepth(vec4(texture(dtex, texc).xyz, 0.0));
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vec3 tmp = vec3(texc, z);
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tmp = tmp * 2.0 - 1.0;
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vec4 xpos = vec4(tmp, 1.0);
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xpos = ipvmat * xpos;
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xpos.xyz /= xpos.w;
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wpos = xpos.xyz;
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// Now we have this pixel's world-space position. Convert to shadow space.
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vec4 pos = shadowmat * vec4(xpos.xyz, 1.0);
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gl_Position = pos;
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}
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