8fcb476f64
quality is now comparable to MSAA4, but provides antialiasing to pixels on upscaled textures as well which is not possible with conventional MSAA
295 lines
12 KiB
GLSL
295 lines
12 KiB
GLSL
#line 2
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/*
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* Copyright (c) 2022-2023 LAX1DUDE. All Rights Reserved.
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*
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* WITH THE EXCEPTION OF PATCH FILES, MINIFIED JAVASCRIPT, AND ALL FILES
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* NORMALLY FOUND IN AN UNMODIFIED MINECRAFT RESOURCE PACK, YOU ARE NOT ALLOWED
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* TO SHARE, DISTRIBUTE, OR REPURPOSE ANY FILE USED BY OR PRODUCED BY THE
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* SOFTWARE IN THIS REPOSITORY WITHOUT PRIOR PERMISSION FROM THE PROJECT AUTHOR.
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*
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* NOT FOR COMMERCIAL OR MALICIOUS USE
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*
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* (please read the 'LICENSE' file this repo's root directory for more info)
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*
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*/
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/*
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* This file was modified by lax1dude to remove dead code
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*
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* Original: https://gist.github.com/kosua20/0c506b81b3812ac900048059d2383126
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*
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*/
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/*
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* ============================================================================
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*
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*
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* NVIDIA FXAA 3.11 by TIMOTHY LOTTES
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*
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*
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* ------------------------------------------------------------------------------
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* COPYRIGHT (C) 2010, 2011 NVIDIA CORPORATION. ALL RIGHTS RESERVED.
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* ------------------------------------------------------------------------------
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* TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED
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* *AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS
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* OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL NVIDIA
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* OR ITS SUPPLIERS BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR
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* LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION,
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* OR ANY OTHER PECUNIARY LOSS) ARISING OUT OF THE USE OF OR INABILITY TO USE
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* THIS SOFTWARE, EVEN IF NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGES.
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*
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*/
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precision lowp int;
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precision highp float;
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precision highp sampler2D;
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in vec2 v_position2f;
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out vec4 output4f;
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uniform sampler2D u_screenTexture;
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uniform vec2 u_screenSize2f;
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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 0
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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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FxaaFloat FxaaLuma(FxaaFloat4 rgba) { return dot(rgba.xyz * 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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#define edgeSharpness 3.0
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#define edgeThreshold 0.15
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#define edgeThresholdMin 0.05
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void main(){
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vec2 screenSize05 = 0.5 * u_screenSize2f;
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vec4 posPos;
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posPos.xy = v_position2f;
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posPos.zw = v_position2f + u_screenSize2f;
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vec4 rcpFrameOpt;
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rcpFrameOpt.xy = -screenSize05;
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rcpFrameOpt.zw = screenSize05;
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output4f = vec4(FxaaPixelShader(v_position2f + screenSize05, posPos, u_screenTexture, rcpFrameOpt, rcpFrameOpt * 4.0, edgeSharpness, edgeThreshold, edgeThresholdMin).rgb, 1.0);
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}
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