37 lines
865 B
GLSL
37 lines
865 B
GLSL
#version 430 core
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layout (points) in;
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layout (triangle_strip, max_vertices = 4) out;
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in vec4 vColor [];
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out vec4 gColor;
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out vec2 tPos;
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uniform mat4 perpMat;
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// consider using isLHS to check if the wall is facing the center
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float isLHS (vec2 startV, vec2 testV)
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{
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return sign( -startV.x * testV.y + startV.y * testV.x);
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}
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void main()
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{
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gColor = vColor[0];
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vec4 p1 = vec4 (gl_in[0].gl_Position.xy,0,1);
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vec4 p2 = vec4 (gl_in[0].gl_Position.zw,0,1);
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vec4 p3 = vec4 (p1.xy,-0.5,1);
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vec4 p4 = vec4 (p2.xy,-0.5,1);
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vec4 a1 = perpMat * p1;
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vec4 a2 = perpMat * p2;
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vec4 a3 = perpMat * p3;
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vec4 a4 = perpMat * p4;
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tPos = vec2 ( 1,-1) ; gl_Position = a1; EmitVertex();
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tPos = vec2 ( 1, 1) ; gl_Position = a3; EmitVertex();
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tPos = vec2 (-1,-1) ; gl_Position = a2; EmitVertex();
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tPos = vec2 (-1, 1) ; gl_Position = a4; EmitVertex();
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EndPrimitive();
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}
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