84 lines
2.9 KiB
GLSL
84 lines
2.9 KiB
GLSL
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#extension GL_ARB_texture_rectangle : enable
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uniform sampler2DRect osgOcean_FullColourMap; // full resolution image
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uniform sampler2DRect osgOcean_FullDepthMap; // full resolution depth map
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uniform sampler2DRect osgOcean_BlurMap; // downsampled and filtered image
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uniform vec2 osgOcean_ScreenRes;
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uniform vec2 osgOcean_ScreenResInv;
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uniform vec2 osgOcean_LowRes;
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#define NUM_TAPS 4
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// maximum CoC radius and diameter in pixels
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const vec2 vMaxCoC = vec2(5.0,10);
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// scale factor for maximum CoC size on low res. image
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const float radiusScale = 0.4;
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// contains poisson-distributed positions on the unit circle
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vec2 poisson[8];
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void main(void)
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{
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poisson[0] = vec2( 0.0, 0.0);
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poisson[1] = vec2( 0.527837, -0.085868);
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poisson[2] = vec2(-0.040088, 0.536087);
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poisson[3] = vec2(-0.670445, -0.179949);
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poisson[4] = vec2(-0.419418, -0.616039);
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poisson[5] = vec2( 0.440453, -0.639399);
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poisson[6] = vec2(-0.757088, 0.349334);
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poisson[7] = vec2( 0.574619, 0.685879);
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// pixel size (1/image resolution) of full resolution image
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vec2 pixelSizeHigh = osgOcean_ScreenResInv;
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// pixel size of low resolution image
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vec2 pixelSizeLow = 4.0 * pixelSizeHigh;
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vec4 color = texture2DRect( osgOcean_FullColourMap, gl_TexCoord[0].st ); // fetch center tap
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// float centerDepth = color.a; // save its depth
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float centerDepth = texture2DRect( osgOcean_FullDepthMap, gl_TexCoord[0].st ).r; // save its depth
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// convert depth into blur radius in pixels
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float discRadius = abs(centerDepth * vMaxCoC.y - vMaxCoC.x);
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// compute disc radius on low-res image
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float discRadiusLow = discRadius * radiusScale;
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vec4 colorAccum = vec4(0.0);
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float depthAccum = 0.0;
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for(int t = 0; t < NUM_TAPS; t++)
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{
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vec2 coordHigh = gl_TexCoord[0].st + ( osgOcean_ScreenRes * (pixelSizeHigh * poisson[t] * discRadius ));
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vec2 coordLow = gl_TexCoord[1].st + ( osgOcean_LowRes * (pixelSizeLow * poisson[t] * discRadiusLow ));
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// fetch low-res tap
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vec4 tapLow = texture2DRect( osgOcean_BlurMap, coordLow );
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// fetch high-res tap
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vec4 tapHigh = texture2DRect( osgOcean_FullColourMap, coordHigh );
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float tapHighDepth = texture2DRect( osgOcean_FullDepthMap, coordHigh ).r;
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// put tap blurriness into [0, 1] range
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float tapBlur = abs(tapHighDepth * 2.0 - 1.0);
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// mix low- and hi-res taps based on tap blurriness
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vec4 tapColor = mix(tapHigh, tapLow, tapBlur);
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// apply leaking reduction: lower weight for taps that are
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// closer than the center tap and in focus
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float tapDepth = (tapHighDepth >= centerDepth) ? 1.0 : abs(tapHighDepth * 2.0 - 1.0);
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// accumulate
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colorAccum += tapColor * tapDepth;
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depthAccum += tapDepth;
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}
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// normalize and return result
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gl_FragColor = colorAccum / depthAccum;
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}
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