33 lines
832 B
GLSL
33 lines
832 B
GLSL
#version 150
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uniform sampler2D t0, ts, tg1;
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uniform float z_near, z_far;
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uniform mat4 mat_proj;
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in vec3 view_dir;
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void main(void) {
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ivec2 tc = ivec2(gl_FragCoord.xy);
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vec4 v0 = texelFetch(t0, tc, 0), vs = texelFetch(ts, tc, 0), vg1 = texelFetch(tg1, tc, 0);
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vec3 n = vec3(-vg1.xy, vg1.z);
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vec3 bn = cross(n, vec3(0, 0, 1));
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vec3 bn2 = cross(n, bn);
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vec4 pos;
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pos.w = 1;
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pos.xyz = view_dir * vs.w;
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vec4 spos = pos, tpos, tv0;
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vec2 tsp;
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float l = 20 * 0.5;
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pos.xyz += bn2 * l;
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for (int i = 0; i < 16; ++i) {
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tpos = mat_proj * pos;
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tsp = -(tpos.xy / tpos.w) / 2. + 0.5;
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tv0 = texture(ts, tsp);
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l *= 0.5;
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pos.xyz += bn2 * (step(pos.z, tv0.w) * 2. - 1.) * l;
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}
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qgl_FragData[0].rgb = vec3(1.-(vs.w - v0.w));
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qgl_FragData[0].rgb = vec3(length(pos.z - spos.z)/15);
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//qgl_FragData[0].rgb = vec3(abs(v0.w/1));
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}
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