mirror of https://github.com/bsnes-emu/bsnes.git
103 lines
2.1 KiB
Forth
103 lines
2.1 KiB
Forth
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// NTSC Shader - written by Hans-Kristian Arntzen
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// License: GPLv3
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// pulled from git://github.com/libretro/common-shaders.git on 01/30/2014
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#version 150
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uniform sampler2D source[];
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uniform vec4 sourceSize[];
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uniform vec4 targetSize;
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uniform int phase;
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// uniforms added for compatibility
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out vec3 col;
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out float mod_phase;
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out float chroma_phase;
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#define THREE_PHASE
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#define COMPOSITE
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// #include "ntsc-param.inc" //
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#define PI 3.14159265
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#if defined(TWO_PHASE)
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#define CHROMA_MOD_FREQ (4.0 * PI / 15.0)
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#elif defined(THREE_PHASE)
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#define CHROMA_MOD_FREQ (PI / 3.0)
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#endif
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#if defined(COMPOSITE)
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#define SATURATION 1.0
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#define BRIGHTNESS 1.0
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#define ARTIFACTING 1.0
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#define FRINGING 1.0
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#elif defined(SVIDEO)
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#define SATURATION 1.0
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#define BRIGHTNESS 1.0
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#define ARTIFACTING 0.0
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#define FRINGING 0.0
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#endif
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#if defined(COMPOSITE) || defined(SVIDEO)
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mat3 mix_mat = mat3(
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BRIGHTNESS, FRINGING, FRINGING,
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ARTIFACTING, 2.0 * SATURATION, 0.0,
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ARTIFACTING, 0.0, 2.0 * SATURATION
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);
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#endif
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// END "ntsc-param.inc" //
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// moved from vertex
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#define pix_no (texCoord.xy * sourceSize[0].xy * (targetSize.xy / sourceSize[0].xy))
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in Vertex {
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vec2 texCoord;
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};
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out vec4 fragColor;
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mat3 yiq2rgb_mat = mat3(
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1.0, 1.0, 1.0,
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0.956, -0.2720, -1.1060,
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0.6210, -0.6474, 1.7046
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);
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vec3 yiq2rgb(vec3 yiq)
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{
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return (yiq * yiq2rgb_mat);
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}
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mat3 yiq_mat = mat3(
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0.2989, 0.5959, 0.2115,
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0.5870, -0.2744, -0.5229,
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0.1140, -0.3216, 0.3114
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);
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vec3 rgb2yiq(vec3 col)
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{
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return (col * yiq_mat);
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}
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void main() {
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// #include "ntsc-pass1-encode-demodulate.inc" //
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vec3 col = texture(source[0], texCoord).rgb;
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vec3 yiq = rgb2yiq(col);
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#if defined(TWO_PHASE)
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float chroma_phase = PI * (mod(pix_no.y, 2.0) + phase);
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#elif defined(THREE_PHASE)
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float chroma_phase = 0.6667 * PI * (mod(pix_no.y, 3.0) + phase);
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#endif
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float mod_phase = chroma_phase + pix_no.x * CHROMA_MOD_FREQ;
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float i_mod = cos(mod_phase);
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float q_mod = sin(mod_phase);
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yiq.yz *= vec2(i_mod, q_mod); // Modulate
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yiq *= mix_mat; // Cross-talk
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yiq.yz *= vec2(i_mod, q_mod); // Demodulate
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fragColor = vec4(yiq, 1.0);
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// END "ntsc-pass1-encode-demodulate.inc" //
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}
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