mirror of https://github.com/bkaradzic/bgfx
83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
/*
|
|
* Copyright 2018 Attila Kocsis. All rights reserved.
|
|
* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
|
|
*/
|
|
|
|
#include "bgfx_compute.sh"
|
|
#include "uniforms.sh"
|
|
|
|
IMAGE2D_ARRAY_WO(s_target, rg8, 0);
|
|
SAMPLER2DARRAY(s_blurInput, 1);
|
|
|
|
// unpacking for edges; 2 bits per edge mean 4 gradient values (0, 0.33, 0.66, 1) for smoother transitions!
|
|
vec4 UnpackEdges( float _packedVal )
|
|
{
|
|
uint packedVal = uint(_packedVal * 255.5);
|
|
vec4 edgesLRTB;
|
|
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
|
|
edgesLRTB.y = float((packedVal >> 4) & 0x03) / 3.0;
|
|
edgesLRTB.z = float((packedVal >> 2) & 0x03) / 3.0;
|
|
edgesLRTB.w = float((packedVal >> 0) & 0x03) / 3.0;
|
|
|
|
return saturate( edgesLRTB + u_invSharpness );
|
|
}
|
|
|
|
// ********************************************************************************************************
|
|
// Pixel shader that does smart blurring (to avoid bleeding)
|
|
|
|
void AddSample( float ssaoValue, float edgeValue, inout float sum, inout float sumWeight )
|
|
{
|
|
float weight = edgeValue;
|
|
|
|
sum += (weight * ssaoValue);
|
|
sumWeight += weight;
|
|
}
|
|
|
|
vec2 SampleBlurred( ivec2 inPos, vec2 coord )
|
|
{
|
|
float packedEdges = texelFetch(s_blurInput, ivec3(inPos.xy,0.0), 0 ).y;
|
|
vec4 edgesLRTB = UnpackEdges( packedEdges );
|
|
|
|
#if BGFX_SHADER_LANGUAGE_GLSL
|
|
vec4 valuesUL = textureGather(s_blurInput, vec3(coord - u_halfViewportPixelSize * 0.5 + vec2(0.0,u_halfViewportPixelSize.y), 0.0), 0).wzyx;
|
|
vec4 valuesBR = textureGather(s_blurInput, vec3(coord + u_halfViewportPixelSize * 0.5 + vec2(0.0,-u_halfViewportPixelSize.y), 0.0), 0).wzyx;
|
|
#else
|
|
vec4 valuesUL = textureGather(s_blurInput, vec3(coord - u_halfViewportPixelSize * 0.5, 0.0), 0);
|
|
vec4 valuesBR = textureGather(s_blurInput, vec3(coord + u_halfViewportPixelSize * 0.5, 0.0), 0);
|
|
#endif
|
|
|
|
float ssaoValue = valuesUL.y;
|
|
float ssaoValueL = valuesUL.x;
|
|
float ssaoValueT = valuesUL.z;
|
|
float ssaoValueR = valuesBR.z;
|
|
float ssaoValueB = valuesBR.x;
|
|
|
|
float sumWeight = 0.5f;
|
|
float sum = ssaoValue * sumWeight;
|
|
|
|
AddSample( ssaoValueL, edgesLRTB.x, sum, sumWeight );
|
|
AddSample( ssaoValueR, edgesLRTB.y, sum, sumWeight );
|
|
|
|
AddSample( ssaoValueT, edgesLRTB.z, sum, sumWeight );
|
|
AddSample( ssaoValueB, edgesLRTB.w, sum, sumWeight );
|
|
|
|
float ssaoAvg = sum / sumWeight;
|
|
|
|
ssaoValue = ssaoAvg; //min( ssaoValue, ssaoAvg ) * 0.2 + ssaoAvg * 0.8;
|
|
|
|
return vec2( ssaoValue, packedEdges );
|
|
}
|
|
|
|
// edge-sensitive blur
|
|
NUM_THREADS(8, 8, 1)
|
|
void main()
|
|
{
|
|
uvec2 dtID = uvec2(gl_GlobalInvocationID.xy) + uvec2(u_rect.xy);
|
|
if (all(lessThan(dtID.xy, u_rect.zw) ) )
|
|
{
|
|
vec2 inUV = (dtID.xy+vec2(0.5,0.5)) * u_halfViewportPixelSize;
|
|
imageStore(s_target, ivec3(dtID.xy, u_layer), SampleBlurred( ivec2(dtID.xy), inUV ).xyyy);
|
|
}
|
|
}
|
|
|