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https://github.com/godotengine/godot.git
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057367bf4f
Introduces support for FSR2 as a new upscaler option available from the project settings. Also introduces an specific render list for surfaces that require motion and the ability to derive motion vectors from depth buffer and camera motion.
251 lines
10 KiB
C++
251 lines
10 KiB
C++
// This file is part of the FidelityFX SDK.
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//
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// Copyright (c) 2022-2023 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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// 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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#define USE_YCOCG 1
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#define fAutogenEpsilon 0.01f
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// EXPERIMENTAL
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FFX_MIN16_F ComputeAutoTC_01(FFX_MIN16_I2 uDispatchThreadId, FFX_MIN16_I2 iPrevIdx)
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{
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FfxFloat32x3 colorPreAlpha = LoadOpaqueOnly(uDispatchThreadId);
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FfxFloat32x3 colorPostAlpha = LoadInputColor(uDispatchThreadId);
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FfxFloat32x3 colorPrevPreAlpha = LoadPrevPreAlpha(iPrevIdx);
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FfxFloat32x3 colorPrevPostAlpha = LoadPrevPostAlpha(iPrevIdx);
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#if USE_YCOCG
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colorPreAlpha = RGBToYCoCg(colorPreAlpha);
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colorPostAlpha = RGBToYCoCg(colorPostAlpha);
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colorPrevPreAlpha = RGBToYCoCg(colorPrevPreAlpha);
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colorPrevPostAlpha = RGBToYCoCg(colorPrevPostAlpha);
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#endif
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FfxFloat32x3 colorDeltaCurr = colorPostAlpha - colorPreAlpha;
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FfxFloat32x3 colorDeltaPrev = colorPrevPostAlpha - colorPrevPreAlpha;
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bool hasAlpha = any(FFX_GREATER_THAN(abs(colorDeltaCurr), FfxFloat32x3(fAutogenEpsilon, fAutogenEpsilon, fAutogenEpsilon)));
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bool hadAlpha = any(FFX_GREATER_THAN(abs(colorDeltaPrev), FfxFloat32x3(fAutogenEpsilon, fAutogenEpsilon, fAutogenEpsilon)));
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FfxFloat32x3 X = colorPreAlpha;
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FfxFloat32x3 Y = colorPostAlpha;
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FfxFloat32x3 Z = colorPrevPreAlpha;
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FfxFloat32x3 W = colorPrevPostAlpha;
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FFX_MIN16_F retVal = FFX_MIN16_F(ffxSaturate(dot(abs(abs(Y - X) - abs(W - Z)), FfxFloat32x3(1, 1, 1))));
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// cleanup very small values
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retVal = (retVal < getTcThreshold()) ? FFX_MIN16_F(0.0f) : FFX_MIN16_F(1.f);
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return retVal;
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}
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// works ok: thin edges
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FFX_MIN16_F ComputeAutoTC_02(FFX_MIN16_I2 uDispatchThreadId, FFX_MIN16_I2 iPrevIdx)
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{
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FfxFloat32x3 colorPreAlpha = LoadOpaqueOnly(uDispatchThreadId);
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FfxFloat32x3 colorPostAlpha = LoadInputColor(uDispatchThreadId);
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FfxFloat32x3 colorPrevPreAlpha = LoadPrevPreAlpha(iPrevIdx);
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FfxFloat32x3 colorPrevPostAlpha = LoadPrevPostAlpha(iPrevIdx);
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#if USE_YCOCG
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colorPreAlpha = RGBToYCoCg(colorPreAlpha);
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colorPostAlpha = RGBToYCoCg(colorPostAlpha);
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colorPrevPreAlpha = RGBToYCoCg(colorPrevPreAlpha);
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colorPrevPostAlpha = RGBToYCoCg(colorPrevPostAlpha);
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#endif
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FfxFloat32x3 colorDelta = colorPostAlpha - colorPreAlpha;
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FfxFloat32x3 colorPrevDelta = colorPrevPostAlpha - colorPrevPreAlpha;
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bool hasAlpha = any(FFX_GREATER_THAN(abs(colorDelta), FfxFloat32x3(fAutogenEpsilon, fAutogenEpsilon, fAutogenEpsilon)));
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bool hadAlpha = any(FFX_GREATER_THAN(abs(colorPrevDelta), FfxFloat32x3(fAutogenEpsilon, fAutogenEpsilon, fAutogenEpsilon)));
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FfxFloat32x3 delta = colorPostAlpha - colorPreAlpha; //prev+1*d = post => d = color, alpha =
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FfxFloat32x3 deltaPrev = colorPrevPostAlpha - colorPrevPreAlpha;
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FfxFloat32x3 X = colorPrevPreAlpha;
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FfxFloat32x3 N = colorPreAlpha - colorPrevPreAlpha;
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FfxFloat32x3 YAminusXA = colorPrevPostAlpha - colorPrevPreAlpha;
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FfxFloat32x3 NminusNA = colorPostAlpha - colorPrevPostAlpha;
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FfxFloat32x3 A = (hasAlpha || hadAlpha) ? NminusNA / max(FfxFloat32x3(fAutogenEpsilon, fAutogenEpsilon, fAutogenEpsilon), N) : FfxFloat32x3(0, 0, 0);
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FFX_MIN16_F retVal = FFX_MIN16_F( max(max(A.x, A.y), A.z) );
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// only pixels that have significantly changed in color shuold be considered
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retVal = ffxSaturate(retVal * FFX_MIN16_F(length(colorPostAlpha - colorPrevPostAlpha)) );
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return retVal;
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}
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// This function computes the TransparencyAndComposition mask:
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// This mask indicates pixels that should discard locks and apply color clamping.
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//
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// Typically this is the case for translucent pixels (that don't write depth values) or pixels where the correctness of
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// the MVs can not be guaranteed (e.g. procedutal movement or vegetation that does not have MVs to reduce the cost during rasterization)
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// Also, large changes in color due to changed lighting should be marked to remove locks on pixels with "old" lighting.
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//
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// This function takes a opaque only and a final texture and uses internal copies of those textures from the last frame.
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// The function tries to determine where the color changes between opaque only and final image to determine the pixels that use transparency.
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// Also it uses the previous frames and detects where the use of transparency changed to mark those pixels.
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// Additionally it marks pixels where the color changed significantly in the opaque only image, e.g. due to lighting or texture animation.
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//
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// In the final step it stores the current textures in internal textures for the next frame
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FFX_MIN16_F ComputeTransparencyAndComposition(FFX_MIN16_I2 uDispatchThreadId, FFX_MIN16_I2 iPrevIdx)
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{
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FFX_MIN16_F retVal = ComputeAutoTC_02(uDispatchThreadId, iPrevIdx);
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// [branch]
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if (retVal > FFX_MIN16_F(0.01f))
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{
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retVal = ComputeAutoTC_01(uDispatchThreadId, iPrevIdx);
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}
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return retVal;
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}
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float computeSolidEdge(FFX_MIN16_I2 curPos, FFX_MIN16_I2 prevPos)
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{
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float lum[9];
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int i = 0;
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for (int y = -1; y < 2; ++y)
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{
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for (int x = -1; x < 2; ++x)
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{
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FfxFloat32x3 curCol = LoadOpaqueOnly(curPos + FFX_MIN16_I2(x, y)).rgb;
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FfxFloat32x3 prevCol = LoadPrevPreAlpha(prevPos + FFX_MIN16_I2(x, y)).rgb;
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lum[i++] = length(curCol - prevCol);
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}
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}
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//float gradX = abs(lum[3] - lum[4]) + abs(lum[5] - lum[4]);
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//float gradY = abs(lum[1] - lum[4]) + abs(lum[7] - lum[4]);
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//return sqrt(gradX * gradX + gradY * gradY);
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float gradX = abs(lum[3] - lum[4]) * abs(lum[5] - lum[4]);
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float gradY = abs(lum[1] - lum[4]) * abs(lum[7] - lum[4]);
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return sqrt(sqrt(gradX * gradY));
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}
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float computeAlphaEdge(FFX_MIN16_I2 curPos, FFX_MIN16_I2 prevPos)
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{
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float lum[9];
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int i = 0;
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for (int y = -1; y < 2; ++y)
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{
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for (int x = -1; x < 2; ++x)
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{
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FfxFloat32x3 curCol = abs(LoadInputColor(curPos + FFX_MIN16_I2(x, y)).rgb - LoadOpaqueOnly(curPos + FFX_MIN16_I2(x, y)).rgb);
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FfxFloat32x3 prevCol = abs(LoadPrevPostAlpha(prevPos + FFX_MIN16_I2(x, y)).rgb - LoadPrevPreAlpha(prevPos + FFX_MIN16_I2(x, y)).rgb);
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lum[i++] = length(curCol - prevCol);
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}
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}
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//float gradX = abs(lum[3] - lum[4]) + abs(lum[5] - lum[4]);
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//float gradY = abs(lum[1] - lum[4]) + abs(lum[7] - lum[4]);
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//return sqrt(gradX * gradX + gradY * gradY);
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float gradX = abs(lum[3] - lum[4]) * abs(lum[5] - lum[4]);
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float gradY = abs(lum[1] - lum[4]) * abs(lum[7] - lum[4]);
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return sqrt(sqrt(gradX * gradY));
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}
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FFX_MIN16_F ComputeAabbOverlap(FFX_MIN16_I2 uDispatchThreadId, FFX_MIN16_I2 iPrevIdx)
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{
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FFX_MIN16_F retVal = FFX_MIN16_F(0.f);
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FfxFloat32x2 fMotionVector = LoadInputMotionVector(uDispatchThreadId);
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FfxFloat32x3 colorPreAlpha = LoadOpaqueOnly(uDispatchThreadId);
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FfxFloat32x3 colorPostAlpha = LoadInputColor(uDispatchThreadId);
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FfxFloat32x3 colorPrevPreAlpha = LoadPrevPreAlpha(iPrevIdx);
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FfxFloat32x3 colorPrevPostAlpha = LoadPrevPostAlpha(iPrevIdx);
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#if USE_YCOCG
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colorPreAlpha = RGBToYCoCg(colorPreAlpha);
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colorPostAlpha = RGBToYCoCg(colorPostAlpha);
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colorPrevPreAlpha = RGBToYCoCg(colorPrevPreAlpha);
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colorPrevPostAlpha = RGBToYCoCg(colorPrevPostAlpha);
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#endif
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FfxFloat32x3 minPrev = FFX_MIN16_F3(+1000.f, +1000.f, +1000.f);
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FfxFloat32x3 maxPrev = FFX_MIN16_F3(-1000.f, -1000.f, -1000.f);
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for (int y = -1; y < 2; ++y)
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{
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for (int x = -1; x < 2; ++x)
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{
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FfxFloat32x3 W = LoadPrevPostAlpha(iPrevIdx + FFX_MIN16_I2(x, y));
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#if USE_YCOCG
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W = RGBToYCoCg(W);
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#endif
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minPrev = min(minPrev, W);
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maxPrev = max(maxPrev, W);
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}
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}
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// instead of computing the overlap: simply count how many samples are outside
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// set reactive based on that
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FFX_MIN16_F count = FFX_MIN16_F(0.f);
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for (int y = -1; y < 2; ++y)
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{
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for (int x = -1; x < 2; ++x)
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{
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FfxFloat32x3 Y = LoadInputColor(uDispatchThreadId + FFX_MIN16_I2(x, y));
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#if USE_YCOCG
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Y = RGBToYCoCg(Y);
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#endif
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count += ((Y.x < minPrev.x) || (Y.x > maxPrev.x)) ? FFX_MIN16_F(1.f) : FFX_MIN16_F(0.f);
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count += ((Y.y < minPrev.y) || (Y.y > maxPrev.y)) ? FFX_MIN16_F(1.f) : FFX_MIN16_F(0.f);
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count += ((Y.z < minPrev.z) || (Y.z > maxPrev.z)) ? FFX_MIN16_F(1.f) : FFX_MIN16_F(0.f);
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}
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}
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retVal = count / FFX_MIN16_F(27.f);
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return retVal;
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}
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// This function computes the Reactive mask:
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// We want pixels marked where the alpha portion of the frame changes a lot between neighbours
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// Those pixels are expected to change quickly between frames, too. (e.g. small particles, reflections on curved surfaces...)
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// As a result history would not be trustworthy.
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// On the other hand we don't want pixels marked where pre-alpha has a large differnce, since those would profit from accumulation
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// For mirrors we may assume the pre-alpha is pretty uniform color.
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//
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// This works well generally, but also marks edge pixels
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FFX_MIN16_F ComputeReactive(FFX_MIN16_I2 uDispatchThreadId, FFX_MIN16_I2 iPrevIdx)
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{
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// we only get here if alpha has a significant contribution and has changed since last frame.
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FFX_MIN16_F retVal = FFX_MIN16_F(0.f);
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// mark pixels with huge variance in alpha as reactive
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FFX_MIN16_F alphaEdge = FFX_MIN16_F(computeAlphaEdge(uDispatchThreadId, iPrevIdx));
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FFX_MIN16_F opaqueEdge = FFX_MIN16_F(computeSolidEdge(uDispatchThreadId, iPrevIdx));
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retVal = ffxSaturate(alphaEdge - opaqueEdge);
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// the above also marks edge pixels due to jitter, so we need to cancel those out
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return retVal;
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}
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