mirror of https://github.com/teverse/teverse
Bad FXAA shader
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teverse
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shaders/fxaa
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@ -1,55 +1,102 @@
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/*
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This file was adapted from
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https://github.com/BennyQBD/3DEngineCpp/blob/a9264241bfa553ca1dde0277391c6c7e69854f26/res/shaders/filter-fxaa.glsl
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please find the copyright information in the link above.
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Portions of this file are subject to the following licenes
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Copyright (c) 2011 by Armin Ronacher.
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Some rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* The names of the contributors may not be used to endorse or
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promote products derived from this software without specific
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prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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$input v_texcoord0
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$input v_texcoord0, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM
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#include <teverse.sh>
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SAMPLER2D(sColour, 0);
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#define fxaaSpanMax 6.0
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#define fxaaReduceMin 0.0078125
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#define fxaaReduceMul 0.125
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#ifndef FXAA_REDUCE_MIN
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#define FXAA_REDUCE_MIN (1.0/ 64.0)
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#endif
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#ifndef FXAA_REDUCE_MUL
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#define FXAA_REDUCE_MUL (1.0 / 4.0)
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#endif
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#ifndef FXAA_SPAN_MAX
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#define FXAA_SPAN_MAX 4.0
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#endif
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//optimized version for mobile, where dependent
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//texture reads can be a bottleneck
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vec4 fxaa(sampler2D tex, vec2 fragCoord, vec2 resolution,
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vec2 v_rgbNW, vec2 v_rgbNE,
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vec2 v_rgbSW, vec2 v_rgbSE,
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vec2 v_rgbM) {
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vec4 color;
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mediump vec2 inverseVP = vec2(1.0 / resolution.x, 1.0 / resolution.y);
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vec3 rgbNW = texture2D(tex, v_rgbNW).xyz;
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vec3 rgbNE = texture2D(tex, v_rgbNE).xyz;
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vec3 rgbSW = texture2D(tex, v_rgbSW).xyz;
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vec3 rgbSE = texture2D(tex, v_rgbSE).xyz;
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vec4 texColor = texture2D(tex, v_rgbM);
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vec3 rgbM = texColor.xyz;
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vec3 luma = vec3(0.299, 0.587, 0.114);
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float lumaNW = dot(rgbNW, luma);
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float lumaNE = dot(rgbNE, luma);
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float lumaSW = dot(rgbSW, luma);
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float lumaSE = dot(rgbSE, luma);
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float lumaM = dot(rgbM, luma);
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float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE)));
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float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE)));
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mediump vec2 dir;
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dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE));
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dir.y = ((lumaNW + lumaSW) - (lumaNE + lumaSE));
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float dirReduce = max((lumaNW + lumaNE + lumaSW + lumaSE) *
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(0.25 * FXAA_REDUCE_MUL), FXAA_REDUCE_MIN);
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float rcpDirMin = 1.0 / (min(abs(dir.x), abs(dir.y)) + dirReduce);
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dir = min(vec2(FXAA_SPAN_MAX, FXAA_SPAN_MAX),
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max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX),
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dir * rcpDirMin)) * inverseVP;
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vec3 rgbA = 0.5 * (
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texture2D(tex, fragCoord * inverseVP + dir * (1.0 / 3.0 - 0.5)).xyz +
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texture2D(tex, fragCoord * inverseVP + dir * (2.0 / 3.0 - 0.5)).xyz);
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vec3 rgbB = rgbA * 0.5 + 0.25 * (
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texture2D(tex, fragCoord * inverseVP + dir * -0.5).xyz +
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texture2D(tex, fragCoord * inverseVP + dir * 0.5).xyz);
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float lumaB = dot(rgbB, luma);
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if ((lumaB < lumaMin) || (lumaB > lumaMax))
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color = vec4(rgbA, texColor.a);
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else
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color = vec4(rgbB, texColor.a);
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return color;
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}
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void main()
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{
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vec2 texCoordOffset = u_viewTexel.xy;
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vec3 luma = vec3(0.299, 0.587, 0.114);
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float lumaTL = dot(luma, texture2D(sColour, v_texcoord0.xy + (vec2(-1.0, -1.0) * texCoordOffset)).xyz);
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float lumaTR = dot(luma, texture2D(sColour, v_texcoord0.xy + (vec2(1.0, -1.0) * texCoordOffset)).xyz);
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float lumaBL = dot(luma, texture2D(sColour, v_texcoord0.xy + (vec2(-1.0, 1.0) * texCoordOffset)).xyz);
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float lumaBR = dot(luma, texture2D(sColour, v_texcoord0.xy + (vec2(1.0, 1.0) * texCoordOffset)).xyz);
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float lumaM = dot(luma, texture2D(sColour, v_texcoord0.xy).xyz);
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vec2 dir;
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dir.x = -((lumaTL + lumaTR) - (lumaBL + lumaBR));
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dir.y = ((lumaTL + lumaBL) - (lumaTR + lumaBR));
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float dirReduce = max((lumaTL + lumaTR + lumaBL + lumaBR) * (fxaaReduceMul * 0.25), fxaaReduceMin);
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float inverseDirAdjustment = 1.0/(min(abs(dir.x), abs(dir.y)) + dirReduce);
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dir = min(vec2(fxaaSpanMax, fxaaSpanMax),
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max(vec2(-fxaaSpanMax, -fxaaSpanMax), dir * inverseDirAdjustment));
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dir.x = dir.x * step(1.0, abs(dir.x));
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dir.y = dir.y * step(1.0, abs(dir.y));
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dir = dir * texCoordOffset;
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vec3 result1 = (1.0/2.0) * (
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texture2D(sColour, v_texcoord0.xy + (dir * vec2(1.0/3.0 - 0.5,1.0/3.0 - 0.5))).xyz +
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texture2D(sColour, v_texcoord0.xy + (dir * vec2(2.0/3.0 - 0.5,2.0/3.0 - 0.5))).xyz);
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vec3 result2 = result1 * (1.0/2.0) + (1.0/4.0) * (
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texture2D(sColour, v_texcoord0.xy + (dir * vec2(0.0/3.0 - 0.5,0.0/3.0 - 0.5))).xyz +
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texture2D(sColour, v_texcoord0.xy + (dir * vec2(3.0/3.0 - 0.5,3.0/3.0 - 0.5))).xyz);
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float lumaMin = min(lumaM, min(min(lumaTL, lumaTR), min(lumaBL, lumaBR)));
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float lumaMax = max(lumaM, max(max(lumaTL, lumaTR), max(lumaBL, lumaBR)));
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float lumaResult2 = dot(luma, result2);
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gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
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vec2 resolution = u_viewRect.zw;
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vec2 fragCoord = v_texcoord0 * resolution;
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gl_FragColor = fxaa(sColour, fragCoord, resolution, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM);
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}
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@ -1,4 +1,9 @@
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vec2 v_texcoord0 : TEXCOORD0 = vec2(0.0, 0.0);
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vec2 v_rgbNW : TEXCOORD1 = vec2(0.0, 0.0);
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vec2 v_rgbNE : TEXCOORD2 = vec2(0.0, 0.0);
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vec2 v_rgbSW : TEXCOORD3 = vec2(0.0, 0.0);
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vec2 v_rgbSE : TEXCOORD4 = vec2(0.0, 0.0);
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vec2 v_rgbM : TEXCOORD5 = vec2(0.0, 0.0);
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vec3 a_position : POSITION;
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vec2 a_texcoord0 : TEXCOORD0;
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@ -1,10 +1,51 @@
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/*
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Portions of this file are subject to the following licenes
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Copyright (c) 2011 by Armin Ronacher.
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Some rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* The names of the contributors may not be used to endorse or
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promote products derived from this software without specific
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prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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$input a_position, a_texcoord0
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$output v_texcoord0
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$output v_texcoord0, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM
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#include <teverse.sh>
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void main()
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{
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vec2 resolution = u_viewRect.zw;
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gl_Position = mul(u_modelViewProj, vec4(a_position, 1.0) );
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v_texcoord0 = a_texcoord0;
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vec2 fragCoord = v_texcoord0 * resolution;
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vec2 inverseVP = 1.0 / resolution.xy;
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v_rgbNW = (fragCoord + vec2(-1.0, -1.0)) * inverseVP;
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v_rgbNE = (fragCoord + vec2(1.0, -1.0)) * inverseVP;
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v_rgbSW = (fragCoord + vec2(-1.0, 1.0)) * inverseVP;
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v_rgbSE = (fragCoord + vec2(1.0, 1.0)) * inverseVP;
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v_rgbM = vec2(fragCoord * inverseVP);
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}
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