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https://github.com/RetroDECK/ES-DE.git
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110 lines
2.6 KiB
GLSL
110 lines
2.6 KiB
GLSL
// SPDX-License-Identifier: MIT
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//
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// EmulationStation Desktop Edition
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// core.glsl
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//
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// Core shader functionality:
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// opacity, saturation, dimming and BGRA to RGBA conversion.
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//
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#if defined(VERTEX)
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// Vertex section of code:
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#if __VERSION__ >= 130
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#define COMPAT_VARYING out
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#define COMPAT_ATTRIBUTE in
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#else
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#define COMPAT_VARYING varying
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#define COMPAT_ATTRIBUTE attribute
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#endif
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#ifdef GL_ES
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#define COMPAT_PRECISION mediump
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#else
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#define COMPAT_PRECISION
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#endif
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uniform mat4 MVPMatrix;
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COMPAT_ATTRIBUTE vec2 positionAttrib;
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COMPAT_ATTRIBUTE vec2 TexCoord;
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COMPAT_ATTRIBUTE vec4 colorAttrib;
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COMPAT_VARYING vec4 color;
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COMPAT_VARYING vec2 texCoord;
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void main(void)
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{
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color.rgba = colorAttrib.abgr;
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texCoord = TexCoord;
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gl_Position = MVPMatrix * vec4(positionAttrib.xy, 0.0, 1.0);
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}
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#elif defined(FRAGMENT)
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// Fragment section of code:
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#ifdef GL_ES
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#define COMPAT_PRECISION mediump
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#else
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#define COMPAT_PRECISION
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#endif
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#if __VERSION__ >= 130
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#define COMPAT_VARYING in
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#define COMPAT_TEXTURE texture
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out COMPAT_PRECISION vec4 FragColor;
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#else
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#define COMPAT_VARYING varying
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#define COMPAT_TEXTURE texture2D
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#define FragColor gl_FragColor
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#endif
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COMPAT_VARYING COMPAT_PRECISION vec4 color;
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COMPAT_VARYING COMPAT_PRECISION vec4 color2;
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COMPAT_VARYING COMPAT_PRECISION vec2 texCoord;
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uniform COMPAT_PRECISION float opacity;
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uniform COMPAT_PRECISION float saturation;
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uniform COMPAT_PRECISION float dimming;
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uniform int BGRAToRGBA;
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uniform int font;
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uniform int postProcessing;
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uniform sampler2D myTexture;
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void main()
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{
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COMPAT_PRECISION vec4 sampledColor = COMPAT_TEXTURE(myTexture, texCoord);
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// For fonts the alpha information is stored in the red channel.
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if (font == 1)
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sampledColor = vec4(1.0f, 1.0f, 1.0f, sampledColor.r);
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sampledColor *= color;
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// When post-processing we drop the alpha channel to avoid strange issues
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// with some graphics drivers.
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if (postProcessing == 1)
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sampledColor.a = 1.0f;
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// Opacity.
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if (opacity != 1.0f)
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sampledColor.a = sampledColor.a * opacity;
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// Saturation.
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if (saturation != 1.0f) {
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COMPAT_PRECISION vec3 grayscale = vec3(dot(sampledColor.rgb, vec3(0.34f, 0.55f, 0.11f)));
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COMPAT_PRECISION vec3 blendedColor = mix(grayscale, sampledColor.rgb, saturation);
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sampledColor = vec4(blendedColor, sampledColor.a);
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}
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// Dimming
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if (dimming != 1.0f) {
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COMPAT_PRECISION vec4 dimColor = vec4(dimming, dimming, dimming, 1.0f);
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sampledColor *= dimColor;
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}
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// BGRA to RGBA conversion.
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if (BGRAToRGBA == 1)
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sampledColor = vec4(sampledColor.bgr, sampledColor.a);
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FragColor = sampledColor;
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}
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#endif
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