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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,139 @@ | ||
| $input v_texcoord0 | ||
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| #include <bgfx_shader.sh> | ||
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| SAMPLER2D(u_DiffuseMap, 0); | ||
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| /** | ||
| Basic FXAA implementation based on the code on geeks3d.com with the | ||
| modification that the texture2DLod stuff was removed since it's | ||
| unsupported by WebGL. | ||
| -- | ||
| From: | ||
| https://github.com/mitsuhiko/webgl-meincraft | ||
| Copyright (c) 2011 by Armin Ronacher. | ||
| Some rights reserved. | ||
| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are | ||
| met: | ||
| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above | ||
| copyright notice, this list of conditions and the following | ||
| disclaimer in the documentation and/or other materials provided | ||
| with the distribution. | ||
| * The names of the contributors may not be used to endorse or | ||
| promote products derived from this software without specific | ||
| prior written permission. | ||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
|
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| #ifndef FXAA_REDUCE_MIN | ||
| #define FXAA_REDUCE_MIN (1.0/ 128.0) | ||
| #endif | ||
| #ifndef FXAA_REDUCE_MUL | ||
| #define FXAA_REDUCE_MUL (1.0 / 8.0) | ||
| #endif | ||
| #ifndef FXAA_SPAN_MAX | ||
| #define FXAA_SPAN_MAX 8.0 | ||
| #endif | ||
|
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| //optimized version for mobile, where dependent | ||
| //texture reads can be a bottleneck | ||
| vec4 fxaa(sampler2D tex, vec2 fragCoord, vec2 resolution, | ||
| vec2 v_rgbNW, vec2 v_rgbNE, | ||
| vec2 v_rgbSW, vec2 v_rgbSE, | ||
| vec2 v_rgbM) { | ||
| vec4 color; | ||
| mediump vec2 inverseVP = vec2(1.0 / resolution.x, 1.0 / resolution.y); | ||
| vec3 rgbNW = texture2D(tex, v_rgbNW).xyz; | ||
| vec3 rgbNE = texture2D(tex, v_rgbNE).xyz; | ||
| vec3 rgbSW = texture2D(tex, v_rgbSW).xyz; | ||
| vec3 rgbSE = texture2D(tex, v_rgbSE).xyz; | ||
| vec4 texColor = texture2D(tex, v_rgbM); | ||
| vec3 rgbM = texColor.xyz; | ||
| vec3 luma = vec3(0.299, 0.587, 0.114); | ||
| float lumaNW = dot(rgbNW, luma); | ||
| float lumaNE = dot(rgbNE, luma); | ||
| float lumaSW = dot(rgbSW, luma); | ||
| float lumaSE = dot(rgbSE, luma); | ||
| float lumaM = dot(rgbM, luma); | ||
| float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE))); | ||
| float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE))); | ||
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| mediump vec2 dir; | ||
| dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE)); | ||
| dir.y = ((lumaNW + lumaSW) - (lumaNE + lumaSE)); | ||
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| float dirReduce = max((lumaNW + lumaNE + lumaSW + lumaSE) * | ||
| (0.25 * FXAA_REDUCE_MUL), FXAA_REDUCE_MIN); | ||
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| float rcpDirMin = 1.0 / (min(abs(dir.x), abs(dir.y)) + dirReduce); | ||
| dir = min(vec2(FXAA_SPAN_MAX, FXAA_SPAN_MAX), | ||
| max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX), | ||
| dir * rcpDirMin)) * inverseVP; | ||
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| vec3 rgbA = 0.5 * ( | ||
| texture2D(tex, fragCoord * inverseVP + dir * (1.0 / 3.0 - 0.5)).xyz + | ||
| texture2D(tex, fragCoord * inverseVP + dir * (2.0 / 3.0 - 0.5)).xyz); | ||
| vec3 rgbB = rgbA * 0.5 + 0.25 * ( | ||
| texture2D(tex, fragCoord * inverseVP + dir * -0.5).xyz + | ||
| texture2D(tex, fragCoord * inverseVP + dir * 0.5).xyz); | ||
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| float lumaB = dot(rgbB, luma); | ||
| if ((lumaB < lumaMin) || (lumaB > lumaMax)) | ||
| color = vec4(rgbA, texColor.a); | ||
| else | ||
| color = vec4(rgbB, texColor.a); | ||
| return color; | ||
| } | ||
|
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| void texcoords(vec2 fragCoord, vec2 resolution, | ||
| out vec2 v_rgbNW, out vec2 v_rgbNE, | ||
| out vec2 v_rgbSW, out vec2 v_rgbSE, | ||
| out vec2 v_rgbM) { | ||
| vec2 inverseVP = 1.0 / resolution.xy; | ||
| v_rgbNW = (fragCoord + vec2(-1.0, -1.0)) * inverseVP; | ||
| v_rgbNE = (fragCoord + vec2(1.0, -1.0)) * inverseVP; | ||
| v_rgbSW = (fragCoord + vec2(-1.0, 1.0)) * inverseVP; | ||
| v_rgbSE = (fragCoord + vec2(1.0, 1.0)) * inverseVP; | ||
| v_rgbM = vec2(fragCoord * inverseVP); | ||
| } | ||
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| vec4 apply(sampler2D tex, vec2 fragCoord, vec2 resolution) { | ||
| mediump vec2 v_rgbNW; | ||
| mediump vec2 v_rgbNE; | ||
| mediump vec2 v_rgbSW; | ||
| mediump vec2 v_rgbSE; | ||
| mediump vec2 v_rgbM; | ||
|
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| //compute the texture coords | ||
| texcoords(fragCoord, resolution, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM); | ||
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| //compute FXAA | ||
| return fxaa(tex, fragCoord, resolution, v_rgbNW, v_rgbNE, v_rgbSW, v_rgbSE, v_rgbM); | ||
| } | ||
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| void main() | ||
| { | ||
| gl_FragColor = apply(u_DiffuseMap, v_texcoord0 * u_viewRect.zw, u_viewRect.zw); | ||
| } |