bgfx/examples/43-denoise/parameters.sh

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add denoise example (#2344) /* * Implement SVGF style denoising as bgfx example. Goal is to explore various * options and parameters, not produce an optimized, efficient denoiser. * * Starts with deferred rendering scene with very basic lighting. Lighting is * masked out with a noise pattern to provide something to denoise. There are * two options for the noise pattern. One is a fixed 2x2 dither pattern to * stand-in for lighting at quarter resolution. The other is the common * shadertoy random pattern as a stand-in for some fancier lighting without * enough samples per pixel, like ray tracing. * * First a temporal denoising filter is applied. The temporal filter is only * using normals to reject previous samples. The SVGF paper also describes using * depth comparison to reject samples but that is not implemented here. * * Followed by some number of spatial filters. These are implemented like in the * SVGF paper. As an alternative to the 5x5 Edge-Avoiding A-Trous filter, can * select a 3x3 filter instead. The 3x3 filter takes fewer samples and covers a * smaller area, but takes less time to compute. From a loosely eyeballed * comparison, N 5x5 passes looks similar to N+1 3x3 passes. The wider spatial * filters take a fair chunk of time to compute. I wonder if it would be a good * idea to interleave the input texture before computing, after the first pass * which skips zero pixels. * * I have not implemetened the variance guided part. * * There's also an optional TXAA pass to be applied after. I am not happy with * its implementation yet, so it defaults to off here. */ /* * References: * Spatiotemporal Variance-Guided Filtering: Real-Time Reconstruction for * Path-Traced Global Illumination. by Christoph Schied and more. * - SVGF denoising algorithm * * Streaming G-Buffer Compression for Multi-Sample Anti-Aliasing. * by E. Kerzner and M. Salvi. * - details about history comparison for temporal denoising filter * * Edge-Avoiding À-Trous Wavelet Transform for Fast Global Illumination * Filtering. by Holger Dammertz and more. * - details about a-trous algorithm for spatial denoising filter */
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/*
* Copyright 2021 elven cache. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
add denoise example (#2344) /* * Implement SVGF style denoising as bgfx example. Goal is to explore various * options and parameters, not produce an optimized, efficient denoiser. * * Starts with deferred rendering scene with very basic lighting. Lighting is * masked out with a noise pattern to provide something to denoise. There are * two options for the noise pattern. One is a fixed 2x2 dither pattern to * stand-in for lighting at quarter resolution. The other is the common * shadertoy random pattern as a stand-in for some fancier lighting without * enough samples per pixel, like ray tracing. * * First a temporal denoising filter is applied. The temporal filter is only * using normals to reject previous samples. The SVGF paper also describes using * depth comparison to reject samples but that is not implemented here. * * Followed by some number of spatial filters. These are implemented like in the * SVGF paper. As an alternative to the 5x5 Edge-Avoiding A-Trous filter, can * select a 3x3 filter instead. The 3x3 filter takes fewer samples and covers a * smaller area, but takes less time to compute. From a loosely eyeballed * comparison, N 5x5 passes looks similar to N+1 3x3 passes. The wider spatial * filters take a fair chunk of time to compute. I wonder if it would be a good * idea to interleave the input texture before computing, after the first pass * which skips zero pixels. * * I have not implemetened the variance guided part. * * There's also an optional TXAA pass to be applied after. I am not happy with * its implementation yet, so it defaults to off here. */ /* * References: * Spatiotemporal Variance-Guided Filtering: Real-Time Reconstruction for * Path-Traced Global Illumination. by Christoph Schied and more. * - SVGF denoising algorithm * * Streaming G-Buffer Compression for Multi-Sample Anti-Aliasing. * by E. Kerzner and M. Salvi. * - details about history comparison for temporal denoising filter * * Edge-Avoiding À-Trous Wavelet Transform for Fast Global Illumination * Filtering. by Holger Dammertz and more. * - details about a-trous algorithm for spatial denoising filter */
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*/
#ifndef PARAMETERS_SH
#define PARAMETERS_SH
uniform vec4 u_params[13];
#define u_jitterCurr (u_params[0].xy)
#define u_jitterPrev (u_params[0].zw)
#define u_feedbackMin (u_params[1].x)
#define u_feedbackMax (u_params[1].y)
#define u_applyMitchellFilter (u_params[2].y)
#define u_worldToViewPrev0 (u_params[3])
#define u_worldToViewPrev1 (u_params[4])
#define u_worldToViewPrev2 (u_params[5])
#define u_worldToViewPrev3 (u_params[6])
#define u_viewToProjPrev0 (u_params[7])
#define u_viewToProjPrev1 (u_params[8])
#define u_viewToProjPrev2 (u_params[9])
#define u_viewToProjPrev3 (u_params[10])
#define u_frameIdx (u_params[11].x)
#define u_noiseType (u_params[11].y) // 0=none, 1=dither, 2=random
#define u_texCoordStep (u_params[12].x)
#define u_sigmaDepth (u_params[12].y)
#define u_sigmaNormal (u_params[12].z)
#endif // PARAMETERS_SH