mirror of
https://github.com/Xaymar/obs-StreamFX
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5a3954ae0e
Fixes several files incorrectly stated a different license from the actual project, as well as the copyright headers included in all files. This change has no effect on the licensing terms, it should clear up a bit of confusion by contributors. Plus the files get a bit smaller, and we have less duplicated information across the entire project. Overall the project is GPLv2 if not built with Qt, and GPLv3 if it is built with Qt. There are no parts licensed under a different license, all have been adapted from other compatible licenses into GPLv2 or GPLv3.
99 lines
3.4 KiB
Text
99 lines
3.4 KiB
Text
// AUTOGENERATED COPYRIGHT HEADER START
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// Copyright (C) 2019-2023 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
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// AUTOGENERATED COPYRIGHT HEADER END
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#include "common.effect"
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// # Linear Optimization
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// While the normal way is to sample every texel in the pSize, linear optimization
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// takes advantage of the fact that most people, especially after compression,
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// will not be able to tell the difference between a linear approximation and
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// the actual thing.
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//
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// Instead of sampling every texel like this:
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//
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// |Tx|Tx|Tx|Tx|Tx|
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// Tx|-2|-1| 0|+1|+2|
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//
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// Linear optimization will sample like this:
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//
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// |Tx|Tx|Tx|Tx|Tx|
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// Tx| -1 | 0| +1 |
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//
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// This effectively removes half the necessary samples and looks identical when
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// when used with box blur. However there is an edge case when the blur width
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// is not a multiple of two, where two additional samples have to be spent on
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// reading the outer edge:
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//
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// |Tx|Tx|Tx|Tx|Tx|Tx|Tx|
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// Tx|-2| -1 | 0| +1 |+2|
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//
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// or this alternative pattern that uses two less samples:
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//
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// |Tx|Tx|Tx|Tx|Tx|Tx|Tx|
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// Tx| 0 | +1 | +2 |+3|
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//
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// or this alternative pattern that also uses two less samples:
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//
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// |Tx|Tx|Tx|Tx|Tx|Tx|Tx|
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// Tx| -2 | -1~~+1 | +2 |
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//
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// With careful planning this can even be used for other types of Blur, such as
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// Gaussian Blur, which suffers a larger hit - however there are better and
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// faster alternatives than linear sampling with Gaussian Blur, such as
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// Dual Filtering ("Dual Kawase").
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//------------------------------------------------------------------------------
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// Defines
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//------------------------------------------------------------------------------
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#define MAX_BLUR_SIZE 128
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//------------------------------------------------------------------------------
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// Technique: Directional / Area
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//------------------------------------------------------------------------------
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float4 PSBlur1D(VertexInformation vtx) : TARGET {
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float4 final = pImage.Sample(LinearClampSampler, vtx.uv) * GetKernelAt(0);
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bool is_odd = ((int(round(pSize)) % 2) == 1);
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// y = yes, s = skip, b = break
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// Size-> | 1| 2| 3| 4| 5| 6| 7|
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// -------+--+--+--+--+--+--+--+
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// n=1 | b| y| y| y| y| y| y|
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// n=2 | |bs| s| s| s| s| s|
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// n=3 | | b| b| y| y| y| y|
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// n=4 | | | |bs| s| s| s|
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// n=5 | | | | b| b| y| y|
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// n=6 | | | | | |bs| s|
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// n=7 | | | | | | b| b|
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// n=8 | | | | | | | |
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// Loop unrolling is only possible with a fixed known maximum.
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// Some compilers may unroll up to x iterations, but most will not.
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for (int n = 1; n <= MAX_BLUR_SIZE; n+=2) {
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// Different from normal box, early exit instead of late exit.
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if (n >= pSize) {
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break;
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}
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// TODO: Determine better position than 0.5 for gaussian approximation.
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float2 nstep = (pImageTexel * pStepScale) * (n + 0.5);
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float kernel = kernelAt(n) + kernelAt(n + 1);
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final += pImage.Sample(LinearClampSampler, vtx.uv + nstep) * kernel;
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final += pImage.Sample(LinearClampSampler, vtx.uv - nstep) * kernel;
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}
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if (is_odd) {
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float kernel = kernelAt(pSize);
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float2 nstep = (pImageTexel * pStepScale) * pSize;
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final += pImage.Sample(LinearClampSampler, vtx.uv + nstep) * kernel;
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final += pImage.Sample(LinearClampSampler, vtx.uv - nstep) * kernel;
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}
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return final;
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}
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technique Draw {
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pass {
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vertex_shader = VSDefault(vtx);
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pixel_shader = PSBlur1D(vtx);
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}
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}
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