42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
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#version 400
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layout(triangles, equal_spacing, cw) in;
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in vec3 tcPosition[];
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in vec4 tcColor[];
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in vec3 tcNormal[];
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//out vec3 tePosition;
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out vec4 teColor;
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smooth out vec3 teNormal;
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//out vec3 tePatchDistance;
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//constant projection matrix
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uniform mat4 ProjectionMatrix;
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uniform mat4 ViewMatrix;
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uniform mat3 NormalMatrix;
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void main()
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{
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vec3 p0 = gl_TessCoord.x * tcPosition[0];
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vec3 p1 = gl_TessCoord.y * tcPosition[1];
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vec3 p2 = gl_TessCoord.z * tcPosition[2];
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//tePatchDistance = gl_TessCoord;
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vec3 tePosition = p0 + p1 + p2;
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vec3 n0 = gl_TessCoord.x * tcNormal[0];
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vec3 n1 = gl_TessCoord.y * tcNormal[1];
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vec3 n2 = gl_TessCoord.z * tcNormal[2];
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vec3 tessNormal = normalize(n0 + n1 + n2);
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teNormal = NormalMatrix * tessNormal;
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//sin(a,b) = length(cross(a,b))
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float i0 = (1-gl_TessCoord.x)*gl_TessCoord.x * length(cross(tcNormal[0],tessNormal));
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float i1 = (1-gl_TessCoord.y)*gl_TessCoord.y * length(cross(tcNormal[1],tessNormal));
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float i2 = (1-gl_TessCoord.z)*gl_TessCoord.z * length(cross(tcNormal[2],tessNormal));
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float standout = i0+i1+i2;
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vec4 c0 = gl_TessCoord.x * tcColor[0];
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vec4 c1 = gl_TessCoord.y * tcColor[1];
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vec4 c2 = gl_TessCoord.z * tcColor[2];
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teColor = c0 + c1 + c2;
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gl_Position = ProjectionMatrix * ViewMatrix * vec4(tePosition+tessNormal*standout, 1);
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}
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