src/opengl/util/linear_brush.glsl
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 23:40:16 +0200
branchRCL_3
changeset 4 3b1da2848fc7
parent 0 1918ee327afb
permissions -rw-r--r--
Revision: 201003 Kit: 201007

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);
}