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#version 330 core
#extension GL_ARB_enhanced_layouts : enable
#extension GL_ARB_shading_language_420pack : enable
const vec3[] cube = vec3[]( // http://www.cs.umd.edu/gvil/papers/av_ts.pdf
vec3(-1, 1, 1), // Front-top-left
vec3(1, 1, 1), // Front-top-right
vec3(-1, -1, 1), // Front-bottom-left
vec3(1, -1, 1), // Front-bottom-right
vec3(1, -1, -1), // Back-bottom-right
vec3(1, 1, 1), // Front-top-right
vec3(1, 1, -1), // Back-top-right
vec3(-1, 1, 1), // Front-top-left
vec3(-1, 1, -1), // Back-top-left
vec3(-1, -1, 1), // Front-bottom-left
vec3(-1, -1, -1), // Back-bottom-left
vec3(1, -1, -1), // Back-bottom-right
vec3(-1, 1, -1), // Back-top-left
vec3(1, 1, -1) // Back-top-right
);
uniform mat4 viewProjection;
in vec3 centre[];
in float size[];
layout(points) in;
layout(triangle_strip, max_vertices = cube.length()) out;
out vec4 geo_centre;
void
doVertex(int idx)
{
gl_Position = viewProjection * (gl_in[0].gl_Position + vec4(cube[idx] * size[0], 1));
geo_centre = vec4(centre[0], size[0]);
EmitVertex();
}
void
main()
{
for (int i = 0; i < cube.length(); ++i) {
doVertex(i);
}
EndPrimitive();
}
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