256 lines
10 KiB
GLSL
256 lines
10 KiB
GLSL
#line 0
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precision lowp int;
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precision lowp sampler2D;
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precision lowp float;
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in vec2 pos;
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out vec4 fragColor;
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#define FXAA_PC 1
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#define FXAA_GLSL_130 1
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#define FXAA_FAST_PIXEL_OFFSET 0
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#define FXAA_GATHER4_ALPHA 0
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#ifndef FXAA_GREEN_AS_LUMA
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// For those using non-linear color,
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// and either not able to get luma in alpha, or not wanting to,
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// this enables FXAA to run using green as a proxy for luma.
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// So with this enabled, no need to pack luma in alpha.
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//
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// This will turn off AA on anything which lacks some amount of green.
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// Pure red and blue or combination of only R and B, will get no AA.
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//
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// Might want to lower the settings for both,
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// fxaaConsoleEdgeThresholdMin
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// fxaaQualityEdgeThresholdMin
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// In order to insure AA does not get turned off on colors
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// which contain a minor amount of green.
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//
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// 1 = On.
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// 0 = Off.
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//
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#define FXAA_GREEN_AS_LUMA 1
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#endif
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#ifndef FXAA_DISCARD
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// 1 = Use discard on pixels which don't need AA.
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// 0 = Return unchanged color on pixels which don't need AA.
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#define FXAA_DISCARD 0
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#endif
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/*============================================================================
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API PORTING
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============================================================================*/
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#define FxaaBool bool
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#define FxaaDiscard discard
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#define FxaaFloat float
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#define FxaaFloat2 vec2
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#define FxaaFloat3 vec3
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#define FxaaFloat4 vec4
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#define FxaaHalf float
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#define FxaaHalf2 vec2
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#define FxaaHalf3 vec3
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#define FxaaHalf4 vec4
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#define FxaaInt2 ivec2
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#define FxaaSat(x) clamp(x, 0.0, 1.0)
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#define FxaaTex sampler2D
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/*--------------------------------------------------------------------------*/
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#define FxaaTexTop(t, p) texture(t, p)
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/*============================================================================
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GREEN AS LUMA OPTION SUPPORT FUNCTION
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============================================================================*/
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#if (FXAA_GREEN_AS_LUMA == 0)
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// TODO Luma
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FxaaFloat FxaaLuma(FxaaFloat4 rgba) { return dot(rgba.xyz, vec3(0.299, 0.587, 0.114)); }
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#else
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FxaaFloat FxaaLuma(FxaaFloat4 rgba) { return rgba.y; }
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#endif
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/*============================================================================
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FXAA3 CONSOLE - PC VERSION
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============================================================================*/
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/*--------------------------------------------------------------------------*/
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FxaaFloat4 FxaaPixelShader(
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// See FXAA Quality FxaaPixelShader() source for docs on Inputs!
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//
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// Use noperspective interpolation here (turn off perspective interpolation).
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// {xy} = center of pixel
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FxaaFloat2 pos,
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//
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// Used only for FXAA Console, and not used on the 360 version.
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// Use noperspective interpolation here (turn off perspective interpolation).
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// {xy__} = upper left of pixel
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// {__zw} = lower right of pixel
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FxaaFloat4 fxaaConsolePosPos,
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//
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// Input color texture.
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// {rgb_} = color in linear or perceptual color space
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// if (FXAA_GREEN_AS_LUMA == 0)
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// {___a} = luma in perceptual color space (not linear)
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FxaaTex tex,
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//
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// Only used on FXAA Console.
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// This must be from a constant/uniform.
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// This effects sub-pixel AA quality and inversely sharpness.
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// Where N ranges between,
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// N = 0.50 (default)
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// N = 0.33 (sharper)
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// {x___} = -N/screenWidthInPixels
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// {_y__} = -N/screenHeightInPixels
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// {__z_} = N/screenWidthInPixels
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// {___w} = N/screenHeightInPixels
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FxaaFloat4 fxaaConsoleRcpFrameOpt,
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//
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// Only used on FXAA Console.
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// Not used on 360, but used on PS3 and PC.
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// This must be from a constant/uniform.
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// {x___} = -2.0/screenWidthInPixels
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// {_y__} = -2.0/screenHeightInPixels
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// {__z_} = 2.0/screenWidthInPixels
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// {___w} = 2.0/screenHeightInPixels
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FxaaFloat4 fxaaConsoleRcpFrameOpt2,
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//
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// Only used on FXAA Console.
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// This used to be the FXAA_CONSOLE__EDGE_SHARPNESS define.
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// It is here now to allow easier tuning.
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// This does not effect PS3, as this needs to be compiled in.
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// Use FXAA_CONSOLE__PS3_EDGE_SHARPNESS for PS3.
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// Due to the PS3 being ALU bound,
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// there are only three safe values here: 2 and 4 and 8.
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// These options use the shaders ability to a free *|/ by 2|4|8.
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// For all other platforms can be a non-power of two.
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// 8.0 is sharper (default!!!)
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// 4.0 is softer
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// 2.0 is really soft (good only for vector graphics inputs)
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FxaaFloat fxaaConsoleEdgeSharpness,
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//
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// Only used on FXAA Console.
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// This used to be the FXAA_CONSOLE__EDGE_THRESHOLD define.
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// It is here now to allow easier tuning.
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// This does not effect PS3, as this needs to be compiled in.
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// Use FXAA_CONSOLE__PS3_EDGE_THRESHOLD for PS3.
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// Due to the PS3 being ALU bound,
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// there are only two safe values here: 1/4 and 1/8.
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// These options use the shaders ability to a free *|/ by 2|4|8.
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// The console setting has a different mapping than the quality setting.
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// Other platforms can use other values.
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// 0.125 leaves less aliasing, but is softer (default!!!)
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// 0.25 leaves more aliasing, and is sharper
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FxaaFloat fxaaConsoleEdgeThreshold,
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//
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// Only used on FXAA Console.
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// This used to be the FXAA_CONSOLE__EDGE_THRESHOLD_MIN define.
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// It is here now to allow easier tuning.
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// Trims the algorithm from processing darks.
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// The console setting has a different mapping than the quality setting.
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// This does not apply to PS3,
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// PS3 was simplified to avoid more shader instructions.
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// 0.06 - faster but more aliasing in darks
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// 0.05 - default
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// 0.04 - slower and less aliasing in darks
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// Special notes when using FXAA_GREEN_AS_LUMA,
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// Likely want to set this to zero.
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// As colors that are mostly not-green
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// will appear very dark in the green channel!
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// Tune by looking at mostly non-green content,
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// then start at zero and increase until aliasing is a problem.
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FxaaFloat fxaaConsoleEdgeThresholdMin
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) {
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/*--------------------------------------------------------------------------*/
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FxaaFloat lumaNw = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.xy));
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FxaaFloat lumaSw = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.xw));
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FxaaFloat lumaNe = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.zy));
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FxaaFloat lumaSe = FxaaLuma(FxaaTexTop(tex, fxaaConsolePosPos.zw));
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/*--------------------------------------------------------------------------*/
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FxaaFloat4 rgbyM = FxaaTexTop(tex, pos.xy);
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#if (FXAA_GREEN_AS_LUMA == 0)
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// TODO Luma
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FxaaFloat lumaM = FxaaLuma(rgbyM);
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#else
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FxaaFloat lumaM = rgbyM.y;
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#endif
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/*--------------------------------------------------------------------------*/
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FxaaFloat lumaMaxNwSw = max(lumaNw, lumaSw);
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lumaNe += 1.0/384.0;
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FxaaFloat lumaMinNwSw = min(lumaNw, lumaSw);
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/*--------------------------------------------------------------------------*/
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FxaaFloat lumaMaxNeSe = max(lumaNe, lumaSe);
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FxaaFloat lumaMinNeSe = min(lumaNe, lumaSe);
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/*--------------------------------------------------------------------------*/
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FxaaFloat lumaMax = max(lumaMaxNeSe, lumaMaxNwSw);
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FxaaFloat lumaMin = min(lumaMinNeSe, lumaMinNwSw);
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/*--------------------------------------------------------------------------*/
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FxaaFloat lumaMaxScaled = lumaMax * fxaaConsoleEdgeThreshold;
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/*--------------------------------------------------------------------------*/
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FxaaFloat lumaMinM = min(lumaMin, lumaM);
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FxaaFloat lumaMaxScaledClamped = max(fxaaConsoleEdgeThresholdMin, lumaMaxScaled);
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FxaaFloat lumaMaxM = max(lumaMax, lumaM);
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FxaaFloat dirSwMinusNe = lumaSw - lumaNe;
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FxaaFloat lumaMaxSubMinM = lumaMaxM - lumaMinM;
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FxaaFloat dirSeMinusNw = lumaSe - lumaNw;
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if(lumaMaxSubMinM < lumaMaxScaledClamped)
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{
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#if (FXAA_DISCARD == 1)
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FxaaDiscard;
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#else
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return rgbyM;
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#endif
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}
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/*--------------------------------------------------------------------------*/
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FxaaFloat2 dir;
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dir.x = dirSwMinusNe + dirSeMinusNw;
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dir.y = dirSwMinusNe - dirSeMinusNw;
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/*--------------------------------------------------------------------------*/
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FxaaFloat2 dir1 = normalize(dir.xy);
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FxaaFloat4 rgbyN1 = FxaaTexTop(tex, pos.xy - dir1 * fxaaConsoleRcpFrameOpt.zw);
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FxaaFloat4 rgbyP1 = FxaaTexTop(tex, pos.xy + dir1 * fxaaConsoleRcpFrameOpt.zw);
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/*--------------------------------------------------------------------------*/
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FxaaFloat dirAbsMinTimesC = min(abs(dir1.x), abs(dir1.y)) * fxaaConsoleEdgeSharpness;
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FxaaFloat2 dir2 = clamp(dir1.xy / dirAbsMinTimesC, -2.0, 2.0);
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/*--------------------------------------------------------------------------*/
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FxaaFloat2 dir2x = dir2 * fxaaConsoleRcpFrameOpt2.zw;
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FxaaFloat4 rgbyN2 = FxaaTexTop(tex, pos.xy - dir2x);
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FxaaFloat4 rgbyP2 = FxaaTexTop(tex, pos.xy + dir2x);
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/*--------------------------------------------------------------------------*/
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FxaaFloat4 rgbyA = rgbyN1 + rgbyP1;
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FxaaFloat4 rgbyB = ((rgbyN2 + rgbyP2) * 0.25) + (rgbyA * 0.25);
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/*--------------------------------------------------------------------------*/
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#if (FXAA_GREEN_AS_LUMA == 0)
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// TODO Luma
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float lumaB = FxaaLuma(rgbyB);
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#else
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float lumaB = rgbyB.y;
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#endif
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if((lumaB < lumaMin) || (lumaB > lumaMax))
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rgbyB.xyz = rgbyA.xyz * 0.5;
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//
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return rgbyB;
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}
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/*==========================================================================*/
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uniform sampler2D f_color;
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uniform vec2 screenSize;
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#define edgeSharpness 7.0
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#define edgeThreshold 0.1
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#define edgeThresholdMin 0.005
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void main(){
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vec4 posPos;
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posPos.xy = pos - (0.6 / screenSize);
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posPos.zw = pos + (0.6 / screenSize);
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vec4 rcpFrameOpt;
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rcpFrameOpt.xy = vec2(-0.50, -0.50) / screenSize;
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rcpFrameOpt.zw = vec2( 0.50, 0.50) / screenSize;
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vec4 rcpFrameOpt2;
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rcpFrameOpt2.xy = vec2(-2.0, -2.0) / screenSize;
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rcpFrameOpt2.zw = vec2( 2.0, 2.0) / screenSize;
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fragColor = vec4(FxaaPixelShader(pos, posPos, f_color, rcpFrameOpt, rcpFrameOpt2, edgeSharpness, edgeThreshold, edgeThresholdMin).rgb, 1.0);
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}
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