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#version 130
#extension GL_ARB_explicit_attrib_location: require
uniform mat4 mvp;
uniform mat3 mv_normal;
uniform mat4x3 k_uniform[4];
layout(location = 0) in vec2 uv;
out vec4 color;
out vec2 frag_uv;
// Direction of the normal in camera-space.
out vec3 normal_cs;
void main(void)
{
vec4 uhat = vec4((1 - uv.x) * (1 - uv.x) * (1 - uv.x),
3. * uv.x * (1 - uv.x) * (1 - uv.x),
3. * uv.x * uv.x * (1 - uv.x),
uv.x * uv.x * uv.x);
vec4 vhat = vec4((1 - uv.y) * (1 - uv.y) * (1 - uv.y),
3. * uv.y * (1 - uv.y) * (1 - uv.y),
3. * uv.y * uv.y * (1 - uv.y),
uv.y * uv.y * uv.y);
mat4x3 m;
m[0] = k_uniform[0] * uhat;
m[1] = k_uniform[1] * uhat;
m[2] = k_uniform[2] * uhat;
m[3] = k_uniform[3] * uhat;
gl_Position = mvp * vec4(m * vhat, 1.0);
/* Transform the normal by the inverse-transpose of the model-view
* matrix.
*/
normal_cs = mv_normal * vec3(0., 1., 0.);
frag_uv = uv;
}
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