83 lines
3.1 KiB
Text
83 lines
3.1 KiB
Text
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// Copyright (c) 2020 Advanced Micro Devices, Inc. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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// ============================================================================
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// Contrast Adaptive Sharpening - deus0ww - 2020-08-04
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//
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// Orginal: https://github.com/GPUOpen-Effects/FidelityFX-CAS
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// Reshade: https://gist.github.com/SLSNe/bbaf2d77db0b2a2a0755df581b3cf00c
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// Reshade: https://gist.github.com/martymcmodding/30304c4bffa6e2bd2eb59ff8bb09d135
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// ============================================================================
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//!HOOK SCALED
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//!BIND HOOKED
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//!DESC Contrast Adaptive Sharpening [0.50]
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#define SHARPNESS 0.50 // Sharpening strength
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#define saturate(x) clamp(x, 0.0, 1.0)
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const float peak = -1.0 / mix(8.0, 5.0, saturate(SHARPNESS));
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vec4 hook() {
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// fetch a 3x3 neighborhood around the pixel 'e',
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// a b c
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// d(e)f
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// g h i
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vec3 a = HOOKED_texOff(ivec2(-1, -1)).rgb;
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vec3 b = HOOKED_texOff(ivec2( 0, -1)).rgb;
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vec3 c = HOOKED_texOff(ivec2( 1, -1)).rgb;
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vec3 d = HOOKED_texOff(ivec2(-1, 0)).rgb;
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vec3 e = HOOKED_texOff(ivec2( 0, 0)).rgb;
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vec3 f = HOOKED_texOff(ivec2( 1, 0)).rgb;
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vec3 g = HOOKED_texOff(ivec2(-1, 1)).rgb;
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vec3 h = HOOKED_texOff(ivec2( 0, 1)).rgb;
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vec3 i = HOOKED_texOff(ivec2( 1, 1)).rgb;
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// Soft min and max.
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// a b c b
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// d e f * 0.5 + d e f * 0.5
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// g h i h
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// These are 2.0x bigger (factored out the extra multiply).
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vec3 mnRGB = min(min(min(d, e), min(f, b)), h);
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vec3 mnRGB2 = min(mnRGB, min(min(a, c), min(g, i)));
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mnRGB += mnRGB2;
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vec3 mxRGB = max(max(max(d, e), max(f, b)), h);
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vec3 mxRGB2 = max(mxRGB, max(max(a, c), max(g, i)));
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mxRGB += mxRGB2;
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// Smooth minimum distance to signal limit divided by smooth max.
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vec3 ampRGB = saturate(min(mnRGB, 2.0 - mxRGB) / mxRGB);
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// Shaping amount of sharpening.
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vec3 wRGB = sqrt(ampRGB) * peak;
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// Filter shape.
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// 0 w 0
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// w 1 w
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// 0 w 0
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vec3 weightRGB = 1.0 + 4.0 * wRGB;
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vec3 window = (b + d) + (f + h);
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return vec4(saturate((window * wRGB + e) / weightRGB).rgb, HOOKED_tex(HOOKED_pos).a);
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}
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