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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 ModelViewMatrix;
uniform mat4 ModelViewProjectionMatrix;
in vec3 pos;
in ivec4 data;
out vec4 vPos;
out vec4 pPos;
out ivec4 vData;
#ifdef VERTEX_FACING
uniform mat4 ProjectionMatrix;
uniform mat3 NormalMatrix;
in vec3 vnor;
out float vFacing;
#endif
void main()
{
vPos = ModelViewMatrix * vec4(pos, 1.0);
pPos = ModelViewProjectionMatrix * vec4(pos, 1.0);
vData = data;
#ifdef VERTEX_FACING
vec3 view_normal = normalize(NormalMatrix * vnor);
vec3 view_vec = (ProjectionMatrix[3][3] == 0.0)
? normalize(vPos.xyz)
: vec3(0.0, 0.0, 1.0);
vFacing = dot(view_vec, view_normal);
#endif
}
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