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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 */
flat in vec4 faceColor;
flat in int faceActive;
out vec4 FragColor;
const vec4 stipple_matrix[4] = vec4[4](
vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, 0.0, 0.0, 0.0),
vec4(0.0, 0.0, 1.0, 0.0),
vec4(0.0, 0.0, 0.0, 0.0)
);
void main()
{
FragColor = faceColor;
if (faceActive == 1) {
int x = int(gl_FragCoord.x) & 0x3; /* mod 4 */
int y = int(gl_FragCoord.y) & 0x3; /* mod 4 */
FragColor *= stipple_matrix[x][y];
}
}
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