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https://gitlab.com/skysthelimit.dev/selenite.git
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114 lines
2.7 KiB
GLSL
114 lines
2.7 KiB
GLSL
/*
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Fragment shader based on "Improved texture interpolation" by Iñigo Quílez
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Original description: http://www.iquilezles.org/www/articles/texture/texture.htm
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*/
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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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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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// vertex 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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COL0 = COLOR;
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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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// fragment 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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vec2 p = vTexCoord.xy;
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p = p * SourceSize.xy + vec2(0.5, 0.5);
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vec2 i = floor(p);
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vec2 f = p - i;
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// Smoothstep - amazingly, smoothstep() is slower than calculating directly the expression!
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// f = smoothstep(0.0, 1.0, f);
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// f = f * f * ( -2.0 * f + 3.0);
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// Quilez - This is sharper than smoothstep.
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//f = f * f * f * (f * (f * 6.0 - vec2(15.0, 15.0)) + vec2(10.0, 10.0));
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// smootheststep - This is even sharper than Quilez!
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f = f * f * f * f * (f * (f * (-20.0 * f + vec2(70.0, 70.0)) - vec2(84.0, 84.0)) + vec2(35.0, 35.0));
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p = i + f;
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p = (p - vec2(0.5, 0.5)) * SourceSize.zw;
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// final sum and weight normalization
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FragColor = vec4(COMPAT_TEXTURE(Source, p).rgb, 1.0);
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}
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#endif
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