130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
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* Copyright 2021 Richard Schubert. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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*
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* AMD FidelityFX Super Resolution 1.0 (FSR)
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* Port from https://github.com/GPUOpen-Effects/FidelityFX-FSR/blob/master/sample/src/VK/FSR_Pass.glsl
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*/
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#include "bgfx_compute.sh"
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uniform vec4 u_params[3];
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#define ViewportSizeRcasAttenuation u_params[0]
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#define SrcSize u_params[1]
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#define DstSize u_params[2]
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#define A_GPU 1
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#if BGFX_SHADER_LANGUAGE_GLSL
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#define A_GLSL 1
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#define A_SKIP_EXT 1
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#else
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#define A_HLSL 1
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#endif // BGFX_SHADER_LANGUAGE_GLSL
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#if SAMPLE_SLOW_FALLBACK
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# include "ffx_a.h"
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SAMPLER2D(InputTexture, 0);
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IMAGE2D_WO(OutputTexture, rgba32f, 1);
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# if SAMPLE_EASU
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#define FSR_EASU_F 1
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AF4 FsrEasuRF(AF2 p) { AF4 res = textureGather(InputTexture, p, 0); return res; }
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AF4 FsrEasuGF(AF2 p) { AF4 res = textureGather(InputTexture, p, 1); return res; }
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AF4 FsrEasuBF(AF2 p) { AF4 res = textureGather(InputTexture, p, 2); return res; }
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# endif
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# if SAMPLE_RCAS
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#define FSR_RCAS_F
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AF4 FsrRcasLoadF(ASU2 p) { return texelFetch(InputTexture, ASU2(p), 0); }
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void FsrRcasInputF(inout AF1 r, inout AF1 g, inout AF1 b) {}
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# endif
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#else
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# define A_HALF
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# include "ffx_a.h"
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SAMPLER2D(InputTexture, 0);
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IMAGE2D_WO(OutputTexture, rgba16f, 1);
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# if SAMPLE_EASU
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#define FSR_EASU_H 1
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AH4 FsrEasuRH(AF2 p) { AH4 res = AH4(textureGather(InputTexture, p, 0)); return res; }
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AH4 FsrEasuGH(AF2 p) { AH4 res = AH4(textureGather(InputTexture, p, 1)); return res; }
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AH4 FsrEasuBH(AF2 p) { AH4 res = AH4(textureGather(InputTexture, p, 2)); return res; }
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# endif
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# if SAMPLE_RCAS
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#define FSR_RCAS_H
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AH4 FsrRcasLoadH(ASW2 p) { return AH4(texelFetch(InputTexture, ASU2(p), 0)); }
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void FsrRcasInputH(inout AH1 r,inout AH1 g,inout AH1 b){}
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# endif
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#endif
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#include "ffx_fsr1.h"
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void CurrFilter(AU2 pos, AU4 Const0, AU4 Const1, AU4 Const2, AU4 Const3, AU4 Sample)
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{
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#if SAMPLE_BILINEAR
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AF2 pp = (AF2(pos) * AF2_AU2(Const0.xy) + AF2_AU2(Const0.zw)) * AF2_AU2(Const1.xy) + AF2(0.5, -0.5) * AF2_AU2(Const1.zw);
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imageStore(OutputTexture, ASU2(pos), texture2DLod(InputTexture, pp, 0.0));
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#endif
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#if SAMPLE_EASU
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# if SAMPLE_SLOW_FALLBACK
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AF3 c;
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FsrEasuF(c, pos, Const0, Const1, Const2, Const3);
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if( Sample.x == 1 )
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c *= c;
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imageStore(OutputTexture, ASU2(pos), AF4(c, 1));
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# else
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AH3 c;
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FsrEasuH(c, pos, Const0, Const1, Const2, Const3);
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if( Sample.x == 1 )
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c *= c;
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imageStore(OutputTexture, ASU2(pos), AH4(c, 1));
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# endif
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#endif
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#if SAMPLE_RCAS
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# if SAMPLE_SLOW_FALLBACK
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AF3 c;
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FsrRcasF(c.r, c.g, c.b, pos, Const0);
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if( Sample.x == 1 )
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c *= c;
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imageStore(OutputTexture, ASU2(pos), AF4(c, 1));
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# else
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AH3 c;
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FsrRcasH(c.r, c.g, c.b, pos, Const0);
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if( Sample.x == 1 )
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c *= c;
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imageStore(OutputTexture, ASU2(pos), AH4(c, 1));
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# endif
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#endif
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}
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NUM_THREADS(64, 1, 1)
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void main()
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{
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AU4 Const0, Const1, Const2, Const3, Sample;
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// We compute these constants on GPU because bgfx does not support uniform type uint.
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#if SAMPLE_EASU || SAMPLE_BILINEAR
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FsrEasuCon(Const0, Const1, Const2, Const3,
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ViewportSizeRcasAttenuation.x, ViewportSizeRcasAttenuation.y, // Viewport size (top left aligned) in the input image which is to be scaled.
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SrcSize.x, SrcSize.y, // The size of the input image.
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DstSize.x, DstSize.y); // The output resolution.
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Sample.x = 0; // no HDR output
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#endif // SAMPLE_EASU || SAMPLE_BILINEAR
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#if SAMPLE_RCAS
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FsrRcasCon(Const0, ViewportSizeRcasAttenuation.z);
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Sample.x = 0; // no HDR output
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#endif // SAMPLE_RCAS
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// Do remapping of local xy in workgroup for a more PS-like swizzle pattern.
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AU2 gxy = ARmp8x8(gl_LocalInvocationID.x) + AU2(gl_WorkGroupID.x << 4u, gl_WorkGroupID.y << 4u);
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CurrFilter(gxy, Const0, Const1, Const2, Const3, Sample);
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gxy.x += 8u;
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CurrFilter(gxy, Const0, Const1, Const2, Const3, Sample);
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gxy.y += 8u;
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CurrFilter(gxy, Const0, Const1, Const2, Const3, Sample);
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gxy.x -= 8u;
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CurrFilter(gxy, Const0, Const1, Const2, Const3, Sample);
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}
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