blob: 84bec62e65792a5df0d177cd8d34b2a78de7d092 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
uniform sampler1D palette;
uniform vec2 fmp;
uniform float fmp2_m_radius2;
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;
vec2 B = fmp;
float a = fmp2_m_radius2;
float b = 2.0*dot(A, B);
float c = -dot(A, A);
float val = (-b + sqrt(b*b - 4.0*a*c)) / (2.0*a);
return texture1D(palette, val);
}
|
