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// 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);
}
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