mirror of https://github.com/ZDoom/gzdoom.git
36 lines
962 B
GLSL
36 lines
962 B
GLSL
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in vec2 TexCoord;
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out vec4 FragColor;
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uniform sampler2D LeftEyeTexture;
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uniform sampler2D RightEyeTexture;
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uniform float InvGamma;
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uniform float Contrast;
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uniform float Brightness;
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uniform int WindowPositionParity; // top-of-window might not be top-of-screen
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vec4 ApplyGamma(vec4 c)
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{
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vec3 val = c.rgb * Contrast - (Contrast - 1.0) * 0.5;
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val += Brightness * 0.5;
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val = pow(max(val, vec3(0.0)), vec3(InvGamma));
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return vec4(val, c.a);
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}
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void main()
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{
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int thisHorizontalPixel = int(gl_FragCoord.x); // zero-based column index from left
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bool isLeftEye = (thisHorizontalPixel // because we want to alternate eye view on each column
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+ WindowPositionParity // because the window might not be aligned to the screen
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) % 2 == 0;
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vec4 inputColor;
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if (isLeftEye) {
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inputColor = texture(LeftEyeTexture, TexCoord);
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}
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else {
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// inputColor = vec4(0, 1, 0, 1);
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inputColor = texture(RightEyeTexture, TexCoord);
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}
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FragColor = ApplyGamma(inputColor);
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}
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