mirror of
https://github.com/libretro/glsl-shaders.git
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93 lines
2.1 KiB
GLSL
93 lines
2.1 KiB
GLSL
// flicker
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// show a black screen every other frame
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// license: public domain
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#if defined(VERTEX)
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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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#define COMPAT_TEXTURE texture
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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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#define COMPAT_TEXTURE texture2D
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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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COMPAT_ATTRIBUTE vec4 VertexCoord;
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COMPAT_ATTRIBUTE vec4 COLOR;
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COMPAT_ATTRIBUTE vec4 TexCoord;
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COMPAT_VARYING vec4 COL0;
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COMPAT_VARYING vec4 TEX0;
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vec4 _oPosition1;
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uniform mat4 MVPMatrix;
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uniform COMPAT_PRECISION int FrameDirection;
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uniform COMPAT_PRECISION int FrameCount;
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uniform COMPAT_PRECISION vec2 OutputSize;
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uniform COMPAT_PRECISION vec2 TextureSize;
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uniform COMPAT_PRECISION vec2 InputSize;
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// compatibility #defines
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#define vTexCoord TEX0.xy
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#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
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#define OutSize vec4(OutputSize, 1.0 / OutputSize)
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void main()
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{
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gl_Position = MVPMatrix * VertexCoord;
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TEX0.xy = TexCoord.xy;
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}
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#elif defined(FRAGMENT)
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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 vec4 FragColor;
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#else
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#define COMPAT_VARYING varying
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#define FragColor gl_FragColor
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#define COMPAT_TEXTURE texture2D
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#endif
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#ifdef GL_ES
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#ifdef GL_FRAGMENT_PRECISION_HIGH
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precision highp float;
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#else
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precision mediump float;
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#endif
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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 COMPAT_PRECISION int FrameDirection;
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uniform COMPAT_PRECISION int FrameCount;
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uniform COMPAT_PRECISION vec2 OutputSize;
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uniform COMPAT_PRECISION vec2 TextureSize;
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uniform COMPAT_PRECISION vec2 InputSize;
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uniform sampler2D Texture;
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COMPAT_VARYING vec4 TEX0;
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// compatibility #defines
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#define Source Texture
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#define vTexCoord TEX0.xy
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#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
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#define OutSize vec4(OutputSize, 1.0 / OutputSize)
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void main()
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{
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float check = mod(float(FrameCount), 2.0);
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FragColor = COMPAT_TEXTURE(Source, vTexCoord) * check;
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}
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#endif
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