opengl

Sample code from LearnOpenGL.com
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fragment.sl (246B)

      1 #version 330 core
      2 in vec2 texCoord;
      3 out vec4 FragColor;
      4 uniform sampler2D texture0;
      5 uniform sampler2D texture1;
      6 uniform float alpha;
      7 
      8 void
      9 main()
     10 {
     11 	FragColor = mix(texture(texture0, texCoord),
     12 		texture(texture1, vec2(1, 1)-texCoord), alpha);
     13 }