progs/glsl/multitex.frag

   1 // Multi-texture fragment shader
   2 // Brian Paul
   3
   4 // Composite second texture over first.
   5 // We're assuming the 2nd texture has a meaningful alpha channel.
   6
   7 uniform sampler2D tex1;
   8 uniform sampler2D tex2;
   9
  10 vec4 sample(sampler2D t, vec2 coord)
  11 {
  12    return texture2D(t, coord);
  13 }
  14
  15 void main0()
  16 {
  17    vec4 t1 = texture2D(tex1, gl_TexCoord[0].xy);
  18    //vec4 t1 = sample(tex1, gl_TexCoord[0].xy);
  19    //vec4 t2 = texture2D(tex2, gl_TexCoord[1].xy);
  20    vec4 t2 = sample(tex2, gl_TexCoord[0].xy);
  21    gl_FragColor = mix(t1, t2, t2.w);
  22 }
  23
  24 void main()
  25 {
  26    vec4 t1 = sample(tex1, gl_TexCoord[0].xy);
  27    vec4 t2 = sample(tex2, gl_TexCoord[0].xy);
  28    gl_FragColor = t1 + t2;
  29 }
  30 /*
  31   0: MOV SAMPLER[0].x, SAMPLER[0];
  32   1: MOV TEMP[1], INPUT[4];
  33   2: TEX OUTPUT[0], TEMP[1], texture[0], 2D;
  34   3: END
  35 */