35 lines
1.0 KiB
GLSL
35 lines
1.0 KiB
GLSL
#version 450 core
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struct PosTex { vec4 pospos; vec4 texang; };
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layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
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layout (std140, binding = 1) uniform TheLight { vec4 lightPos; vec4 colrad; };
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layout (std430, binding = 2) readonly buffer Pos { PosTex data[]; };
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float rad = colrad.w;
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int indices[18] =
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{5,7,1 // 6----7
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,7,3,1 // /| /|
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,7,6,3 // 2-+--3 |
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,6,2,3 // | 4 | 5
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,6,4,2 // 0 1
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,4,0,2
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};
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vec2 shift(vec2 p) {
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return vec2(lightPos.xy + (rad * normalize(p - lightPos.xy)));
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}
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float detV(vec2 p, vec2 q) {
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return p.x*q.y - p.y*q.x;
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}
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float isLHS(vec2 p, vec2 q) {
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return sign(-detV(p,q));
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}
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void main() {
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vec4 pp = data[gl_VertexID / 18].pospos;
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int j = indices[gl_VertexID % 18];
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vec2 xy = (j % 2 > 0 ? pp.xy : pp.zw);
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float z = ((j / 2) % 2 > 0.5 ? 100 : -500);
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vec2 xyo = ( j > 3.5 ? shift(xy) : xy);
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vec4 p = theMat * vec4(xyo,z,1);
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gl_Position = (isLHS(pp.xy-lightPos.xy,pp.zw-lightPos.xy) < 0
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? p
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: vec4(1,1,1,0));
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}
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