104 lines
3.7 KiB
Python
104 lines
3.7 KiB
Python
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/*
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* Copyright 2018 Attila Kocsis. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include "bgfx_compute.sh"
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#include "uniforms.sh"
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IMAGE2D_WR(s_target, r8, 0);
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SAMPLER2DARRAY(s_finalSSAO, 1);
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// unpacking for edges; 2 bits per edge mean 4 gradient values (0, 0.33, 0.66, 1) for smoother transitions!
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vec4 UnpackEdges( float _packedVal )
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{
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uint packedVal = uint(_packedVal * 255.5);
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vec4 edgesLRTB;
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edgesLRTB.x = float((packedVal >> 6) & 0x03) / 3.0; // there's really no need for mask (as it's an 8 bit input) but I'll leave it in so it doesn't cause any trouble in the future
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edgesLRTB.y = float((packedVal >> 4) & 0x03) / 3.0;
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edgesLRTB.z = float((packedVal >> 2) & 0x03) / 3.0;
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edgesLRTB.w = float((packedVal >> 0) & 0x03) / 3.0;
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return saturate( edgesLRTB + u_invSharpness );
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}
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NUM_THREADS(8, 8, 1)
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void main()
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{
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uvec2 dtID = uvec2(gl_GlobalInvocationID.xy) + uvec2(u_rect.xy);
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if (all(lessThan(dtID.xy, u_rect.zw) ) )
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{
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float ao;
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uvec2 pixPos = uvec2(dtID.xy);
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uvec2 pixPosHalf = pixPos / uvec2(2, 2);
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// calculate index in the four deinterleaved source array texture
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int mx = (int(pixPos.x) % 2);
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#if BGFX_SHADER_LANGUAGE_GLSL
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int dimy = imageSize(s_target).y;
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int my = (int(dimy-1-pixPos.y) % 2);
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#else
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int my = (int(pixPos.y) % 2);
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#endif
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int ic = mx + my * 2; // center index
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int ih = (1-mx) + my * 2; // neighbouring, horizontal
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int iv = mx + (1-my) * 2; // neighbouring, vertical
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int id = (1-mx) + (1-my)*2; // diagonal
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vec2 centerVal = texelFetch(s_finalSSAO, ivec3(pixPosHalf, ic), 0 ).xy;
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ao = centerVal.x;
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#if 1 // change to 0 if you want to disable last pass high-res blur (for debugging purposes, etc.)
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vec4 edgesLRTB = UnpackEdges( centerVal.y );
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// return 1.0 - vec4( edgesLRTB.x, edgesLRTB.y * 0.5 + edgesLRTB.w * 0.5, edgesLRTB.z, 0.0 ); // debug show edges
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// convert index shifts to sampling offsets
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float fmx = float(mx);
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float fmy = float(my);
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// in case of an edge, push sampling offsets away from the edge (towards pixel center)
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float fmxe = (edgesLRTB.y - edgesLRTB.x);
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float fmye = (edgesLRTB.w - edgesLRTB.z);
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// calculate final sampling offsets and sample using bilinear filter
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#if BGFX_SHADER_LANGUAGE_GLSL
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vec2 uvH = (dtID.xy + vec2( fmx + fmxe - 0.5, 1.0 - (0.5 - fmy) ) ) * 0.5 * u_halfViewportPixelSize;
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#else
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vec2 uvH = (dtID.xy + vec2( fmx + fmxe - 0.5, 0.5 - fmy ) ) * 0.5 * u_halfViewportPixelSize;
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#endif
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float aoH = texture2DArrayLod(s_finalSSAO, vec3( uvH, ih ), 0 ).x;
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#if BGFX_SHADER_LANGUAGE_GLSL
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vec2 uvV = (dtID.xy + vec2( 0.5 - fmx, 1.0 - (fmy - 0.5 + fmye) ) ) * 0.5 * u_halfViewportPixelSize;
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#else
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vec2 uvV = (dtID.xy + vec2( 0.5 - fmx, fmy - 0.5 + fmye ) ) * 0.5 * u_halfViewportPixelSize;
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#endif
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float aoV = texture2DArrayLod(s_finalSSAO, vec3( uvV, iv ), 0 ).x;
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#if BGFX_SHADER_LANGUAGE_GLSL
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vec2 uvD = (dtID.xy + vec2( fmx - 0.5 + fmxe, 1.0 - (fmy - 0.5 + fmye) ) ) * 0.5 * u_halfViewportPixelSize;
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#else
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vec2 uvD = (dtID.xy + vec2( fmx - 0.5 + fmxe, fmy - 0.5 + fmye ) ) * 0.5 * u_halfViewportPixelSize;
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#endif
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float aoD = texture2DArrayLod(s_finalSSAO, vec3( uvD, id ), 0 ).x;
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// reduce weight for samples near edge - if the edge is on both sides, weight goes to 0
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vec4 blendWeights;
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blendWeights.x = 1.0;
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blendWeights.y = (edgesLRTB.x + edgesLRTB.y) * 0.5;
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blendWeights.z = (edgesLRTB.z + edgesLRTB.w) * 0.5;
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blendWeights.w = (blendWeights.y + blendWeights.z) * 0.5;
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// calculate weighted average
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float blendWeightsSum = dot( blendWeights, vec4( 1.0, 1.0, 1.0, 1.0 ) );
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ao = dot( vec4( ao, aoH, aoV, aoD ), blendWeights ) / blendWeightsSum;
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#endif
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ao = pow(ao,1.0/2.2);
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imageStore(s_target, ivec2(dtID.xy), ao.xxxx);
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}
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}
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