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Improve shadow rendering with non-default camera FOV (#11385)

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* Adjust minimum filter radius for perspective

* Expand shadow frustum when camera FOV changes, reuse FOV distance adjustment from numeric.cpp

* Read shadow_soft_radius setting as float

* Use adaptive filter radius to accomodate for PSM distortion

* Adjust filter radius for texture resolution
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x2048 2021-07-11 17:15:19 +02:00 • committed by GitHub
parent 1d25d1f7ad
commit f5706d444b
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4 changed files with 37 additions and 23 deletions
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16
client/shaders/nodes_shader/opengl_fragment.glsl
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@ -181,9 +181,14 @@ float getDeltaPerspectiveFactor(float l)
float getPenumbraRadius(sampler2D shadowsampler, vec2 smTexCoord, float realDistance, float multiplier)
{
float baseLength = getBaseLength(smTexCoord);
float perspectiveFactor;
// Return fast if sharp shadows are requested
if (SOFTSHADOWRADIUS <= 1.0)
return SOFTSHADOWRADIUS;
if (SOFTSHADOWRADIUS <= 1.0) {
perspectiveFactor = getDeltaPerspectiveFactor(baseLength);
return max(2 * length(smTexCoord.xy) * 2048 / f_textureresolution / pow(perspectiveFactor, 3), SOFTSHADOWRADIUS);
}
vec2 clampedpos;
float texture_size = 1.0 / (2048 /*f_textureresolution*/ * 0.5);
@ -192,8 +197,6 @@ float getPenumbraRadius(sampler2D shadowsampler, vec2 smTexCoord, float realDist
float pointDepth;
float maxRadius = SOFTSHADOWRADIUS * 5.0 * multiplier;
float baseLength = getBaseLength(smTexCoord);
float perspectiveFactor;
float bound = clamp(PCFBOUND * (1 - baseLength), 0.5, PCFBOUND);
int n = 0;
@ -211,9 +214,10 @@ float getPenumbraRadius(sampler2D shadowsampler, vec2 smTexCoord, float realDist
}
depth = depth / n;
depth = pow(clamp(depth, 0.0, 1000.0), 1.6) / 0.001;
return max(0.5, depth * maxRadius);
perspectiveFactor = getDeltaPerspectiveFactor(baseLength);
return max(length(smTexCoord.xy) * 2 * 2048 / f_textureresolution / pow(perspectiveFactor, 3), depth * maxRadius);
}
#ifdef POISSON_FILTER