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/* Solid Wirefram implementation
* Mike Erwin, Clément Foucault */
/* This shader follows the principles of
* http://developer.download.nvidia.com/SDK/10/direct3d/Source/SolidWireframe/Doc/SolidWireframe.pdf */
uniform mat4 ModelViewProjectionMatrix;
uniform vec2 viewportSize;
in vec3 pos;
in ivec4 data;
/* these are the same for all vertices
* and does not need interpolation */
flat out vec3 edgesCrease;
flat out vec3 edgesBweight;
flat out vec4 faceColor;
flat out ivec3 flag;
#ifdef VERTEX_SELECTION
out vec3 vertexColor;
#endif
/* See fragment shader */
flat out vec2 ssPos[3];
/* project to screen space */
vec2 proj(vec4 pos)
{
return (0.5 * (pos.xy / pos.w) + 0.5) * viewportSize;
}
void main()
{
edgesCrease = vec3(0.0);
edgesBweight = vec3(0.0);
vec4 pPos = ModelViewProjectionMatrix * vec4(pos, 1.0);
/* there is no face */
faceColor = vec4(0.0);
#ifdef VERTEX_SELECTION
vertexColor = vec3(0.0);
#endif
ssPos[0] = ssPos[1] = ssPos[2] = proj(pPos);
flag[0] = flag[1] = flag[2] = (data.x << 8);
gl_PointSize = sizeEdgeFix;
gl_Position = pPos;
}
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