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https://github.com/RetroDECK/ES-DE.git
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37 lines
686 B
Plaintext
37 lines
686 B
Plaintext
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//
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// opacity.glsl
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//
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// Changes the opacity of textures.
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// The uniform variable 'opacity' sets the opacity.
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// Setting this to the value 0 results in an invisible texture.
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//
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#if defined(VERTEX)
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// Vertex section of code:
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uniform mat4 MVPMatrix;
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varying vec2 vTexCoord;
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void main(void)
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{
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vTexCoord = gl_MultiTexCoord0.xy;
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gl_Position = MVPMatrix * gl_Vertex;
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}
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#elif defined(FRAGMENT)
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// Fragment section of code:
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uniform float opacity = 1.0;
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uniform sampler2D myTexture;
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varying vec2 vTexCoord;
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void main()
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{
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vec4 color = texture2D(myTexture, vTexCoord);
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float alpha = clamp(color.a-(1-opacity), 0.0, 1.0);
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gl_FragColor = vec4(color.rgb, alpha);
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}
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#endif
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