progs/fpglsl/tex-multi.glsl


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

// Multi-texture fragment shader
// Brian Paul

// Composite second texture over first.
// We're assuming the 2nd texture has a meaningful alpha channel.

uniform sampler2D tex1;
uniform sampler2D tex2;

void main()
{
   vec4 t1 = texture2D(tex1, gl_Color.xy);
   vec4 t2 = texture2D(tex2, gl_Color.yz);
   gl_FragColor = mix(t1, t2, t2.w);
}