40 lines
1.3 KiB
GLSL
40 lines
1.3 KiB
GLSL
#version 450 core
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layout (points) in;
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layout (triangle_strip, max_vertices = 4) out;
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layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
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in vec2 vTexAng[];
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out float gAng;
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out vec2 tPos;
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out vec4 gPos;
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out vec3 gTexCoords;
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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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{ return sign( -startV.x * testV.y + startV.y * testV.x); }
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void main()
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{ gAng = vTexAng[0].y;
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float tcoordz = vTexAng[0].x;
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vec2 p1xy = gl_in[0].gl_Position.xy;
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vec2 p2xy = gl_in[0].gl_Position.zw;
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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,100,1);
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vec4 p4 = vec4 (p2.xy,100,1);
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vec2 d = vec2(p1.xy - p2.xy);
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float dist = distance(p1xy,p2xy);
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float tcoordx = dist / 50;
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vec4 norm = vec4( d.y, -d.x, 0, 0);
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gPos = p1; tPos = vec2 ( 1,-1) ; gl_Position = vec4(theMat * p1);
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gTexCoords = vec3 (0,0,tcoordz);
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EmitVertex();
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gPos = p3; tPos = vec2 ( 1, 1) ; gl_Position = vec4(theMat * p3);
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gTexCoords = vec3 (0,2,tcoordz);
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EmitVertex();
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gPos = p2; tPos = vec2 (-1,-1) ; gl_Position = vec4(theMat * p2);
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gTexCoords = vec3 (tcoordx,0,tcoordz);
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EmitVertex();
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gPos = p4; tPos = vec2 (-1, 1) ; gl_Position = vec4(theMat * p4);
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gTexCoords = vec3 (tcoordx,2,tcoordz);
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EmitVertex();
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EndPrimitive();
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}
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