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Tune shadow perspective distortion (#12146)

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* Pass perspective distortion parameters as uniforms
* Set all perspective bias parameters via ShadowRenderer
* Recalibrate perspective distortion and shadow range to render less shadow geometry with the same quality and observed shadow distance
This commit is contained in:
x2048
2022-03-31 22:40:06 +02:00
committed by GitHub
parent 06d197cdd0
commit 31578303a4
12 changed files with 117 additions and 59 deletions
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8
client/shaders/object_shader/opengl_vertex.glsl
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@@ -37,8 +37,8 @@ const vec3 artificialLight = vec3(1.04, 1.04, 1.04);
varying float vIDiff;
const float e = 2.718281828459;
const float BS = 10.0;
const float bias0 = 0.9;
const float bias1 = 1.0 - bias0;
uniform float xyPerspectiveBias0;
uniform float xyPerspectiveBias1;
#ifdef ENABLE_DYNAMIC_SHADOWS
// custom smoothstep implementation because it's not defined in glsl1.2
@@ -116,9 +116,9 @@ void main(void)
// Distance from the vertex to the player
float distanceToPlayer = length(eyeToVertex - v_LightDirection * dot(eyeToVertex, v_LightDirection)) / f_shadowfar;
// perspective factor estimation according to the
float perspectiveFactor = distanceToPlayer * bias0 + bias1;
float perspectiveFactor = distanceToPlayer * xyPerspectiveBias0 + xyPerspectiveBias1;
float texelSize = f_shadowfar * perspectiveFactor * perspectiveFactor /
(f_textureresolution * bias1 - perspectiveFactor * bias0);
(f_textureresolution * xyPerspectiveBias1 - perspectiveFactor * xyPerspectiveBias0);
float slopeScale = clamp(pow(1.0 - cosLight*cosLight, 0.5), 0.0, 1.0);
normalOffsetScale = texelSize * slopeScale;