45 lines
1.1 KiB
GLSL
45 lines
1.1 KiB
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 vec2 vRad1[];
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in vec2 vRad2[];
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in vec2 vCen[];
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in float vFactor[];
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out vec2 vcpos;
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out vec2 texPos;
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out vec2 texDist;
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out float gfactor;
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vec2 g(float x,float y, vec2 v, vec2 r1, vec2 r2)
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{ return vec2
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(dot(normalize(r1-v),vec2(x,y)-v) / length(r1-v)
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,dot(normalize(r2-v),vec2(x,y)-v) / length(r2-v)
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);
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}
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void main() {
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vec2 cpos = vCen[0];
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vcpos = cpos;
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vec2 grad1 = vRad1[0];
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vec2 grad2 = vRad2[0];
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gfactor = vFactor[0];
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texPos = vec2(1,1);
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texDist = g(1,1,cpos,grad1,grad2);
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gl_Position = vec4 (1,1,0,1);
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EmitVertex();
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texPos = vec2(1,0);
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texPos = vec2(1,-1);
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texDist = g(1,-1,cpos,grad1,grad2);
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gl_Position = vec4 (1,-1,0,1);
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EmitVertex();
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texPos = vec2(0,1);
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texPos = vec2(-1,1);
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texDist = g(-1,1,cpos,grad1,grad2);
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gl_Position = vec4 (-1,1,0,1);
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EmitVertex();
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texPos = vec2(0,0);
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texPos = vec2(-1,-1);
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texDist = g(-1,-1,cpos,grad1,grad2);
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gl_Position = vec4 (-1,-1,0,1);
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EmitVertex();
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EndPrimitive();
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}
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