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188 lines
6.1 KiB
GLSL
188 lines
6.1 KiB
GLSL
#version 330 core
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#include <globals.glsl>
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uniform sampler2D src_color;
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in vec2 f_pos;
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layout (std140)
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uniform u_locals {
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vec4 nul;
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};
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out vec4 tgt_color;
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/**
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Basic FXAA implementation based on the code on geeks3d.com with the
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modification that the texture2DLod stuff was removed since it's
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unsupported by WebGL.
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--
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From:
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https://github.com/mitsuhiko/webgl-meincraft
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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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#ifndef FXAA_REDUCE_MIN
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#define FXAA_REDUCE_MIN (1.0/ 128.0)
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#endif
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#ifndef FXAA_REDUCE_MUL
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#define FXAA_REDUCE_MUL (1.0 / 8.0)
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#endif
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#ifndef FXAA_SPAN_MAX
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#define FXAA_SPAN_MAX 8.0
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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 = texture(tex, v_rgbNW).xyz;
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vec3 rgbNE = texture(tex, v_rgbNE).xyz;
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vec3 rgbSW = texture(tex, v_rgbSW).xyz;
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vec3 rgbSE = texture(tex, v_rgbSE).xyz;
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vec4 texColor = texture(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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texture(tex, fragCoord * inverseVP + dir * (1.0 / 3.0 - 0.5)).xyz +
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texture(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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texture(tex, fragCoord * inverseVP + dir * -0.5).xyz +
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texture(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 texcoords(vec2 fragCoord, vec2 resolution,
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out vec2 v_rgbNW, out vec2 v_rgbNE,
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out vec2 v_rgbSW, out vec2 v_rgbSE,
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out vec2 v_rgbM) {
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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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vec4 fxaa_apply(sampler2D tex, vec2 fragCoord, vec2 resolution) {
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mediump vec2 v_rgbNW;
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mediump vec2 v_rgbNE;
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mediump vec2 v_rgbSW;
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mediump vec2 v_rgbSE;
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mediump vec2 v_rgbM;
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//compute the texture coords
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texcoords(fragCoord, resolution, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM);
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//compute FXAA
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return fxaa(tex, fragCoord, resolution, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM);
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}
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vec3 rgb2hsv(vec3 c) {
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vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
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vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
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vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
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float d = q.x - min(q.w, q.y);
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float e = 1.0e-10;
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return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
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}
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vec3 hsv2rgb(vec3 c) {
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vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
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return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
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}
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const float FXAA_SCALE = 1.5;
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void main() {
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vec2 uv = (f_pos + 1.0) * 0.5;
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if (medium.x == 1u) {
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uv = clamp(uv + vec2(sin(uv.y * 16.0 + tick.x), sin(uv.x * 24.0 + tick.x)) * 0.005, 0, 1);
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}
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vec4 fxaa_color = fxaa_apply(src_color, uv * screen_res.xy * FXAA_SCALE, screen_res.xy * FXAA_SCALE);
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//vec4 fxaa_color = texture(src_color, uv);
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vec4 hsva_color = vec4(rgb2hsv(fxaa_color.rgb), fxaa_color.a);
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hsva_color.y *= 1.45;
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hsva_color.z *= 0.85;
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//hsva_color.z = 1.0 - 1.0 / (1.0 * hsva_color.z + 1.0);
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vec4 final_color = fxaa_color;
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//vec4 final_color = vec4(hsv2rgb(hsva_color.rgb), hsva_color.a);
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if (medium.x == 1u) {
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final_color *= vec4(0.2, 0.2, 0.8, 1.0);
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}
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tgt_color = vec4(final_color.rgb, 1);
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}
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