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uniform sampler1D palette;
uniform vec3 linear;
uniform vec3 inv_matrix_m0;
uniform vec3 inv_matrix_m1;
uniform vec3 inv_matrix_m2;
vec4 brush()
{
mat3 mat;
mat[0] = inv_matrix_m0;
mat[1] = inv_matrix_m1;
mat[2] = inv_matrix_m2;
vec3 hcoords = mat * vec3(gl_FragCoord.xy, 1);
vec2 A = hcoords.xy / hcoords.z;
float val = dot(linear.xy, A) * linear.z;
return texture1D(palette, val);
}
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