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Decrease the default soft shadow quality to improve performance 

Soft shadows are relatively expensive to filter. However, with the
default blur factors, it's not needed to use too many samples
(unless PCSS-like shadows are used with a large size). Textures
and screen-space antialiasing can also be used to mask the noise
pattern effectively.

On a GeForce GTX 1080, going from Medium to Low for both shadow types
saves 0.2-0.4 ms of GPU time per frame in 2560×1440 resolution.
This can translate to significantly higher savings on lower-end GPUs.

Given how the shader works, this improves rendering performance
even if lights with shadows are never used.
This commit is contained in:
Hugo Locurcio 2021-10-23 16:32:38 +02:00
parent 0aa6f27061
commit 970bed62ab
No known key found for this signature in database
GPG Key ID: 39E8F8BE30B0A49C
2 changed files with 4 additions and 4 deletions
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4
doc/classes/ProjectSettings.xml
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@ -1699,7 +1699,7 @@
<member name="rendering/shadows/directional_shadow/size.mobile" type="int" setter="" getter="" default="2048">
Lower-end override for [member rendering/shadows/directional_shadow/size] on mobile devices, due to performance concerns or driver support.
</member>
<member name="rendering/shadows/directional_shadow/soft_shadow_quality" type="int" setter="" getter="" default="3">
<member name="rendering/shadows/directional_shadow/soft_shadow_quality" type="int" setter="" getter="" default="2">
Quality setting for shadows cast by [DirectionalLight3D]s. Higher quality settings use more samples when reading from shadow maps and are thus slower. Low quality settings may result in shadows looking grainy.
[b]Note:[/b] The Soft Very Low setting will automatically multiply [i]constant[/i] shadow blur by 0.75x to reduce the amount of noise visible. This automatic blur change only affects the constant blur factor defined in [member Light3D.shadow_blur], not the variable blur performed by [DirectionalLight3D]s' [member Light3D.light_angular_distance].
[b]Note:[/b] The Soft High and Soft Ultra settings will automatically multiply [i]constant[/i] shadow blur by 1.5× and 2× respectively to make better use of the increased sample count. This increased blur also improves stability of dynamic object shadows.
@ -1727,7 +1727,7 @@
<member name="rendering/shadows/shadow_atlas/size.mobile" type="int" setter="" getter="" default="2048">
Lower-end override for [member rendering/shadows/shadow_atlas/size] on mobile devices, due to performance concerns or driver support.
</member>
<member name="rendering/shadows/shadows/soft_shadow_quality" type="int" setter="" getter="" default="3">
<member name="rendering/shadows/shadows/soft_shadow_quality" type="int" setter="" getter="" default="2">
Quality setting for shadows cast by [OmniLight3D]s and [SpotLight3D]s. Higher quality settings use more samples when reading from shadow maps and are thus slower. Low quality settings may result in shadows looking grainy.
[b]Note:[/b] The Soft Very Low setting will automatically multiply [i]constant[/i] shadow blur by 0.75x to reduce the amount of noise visible. This automatic blur change only affects the constant blur factor defined in [member Light3D.shadow_blur], not the variable blur performed by [DirectionalLight3D]s' [member Light3D.light_angular_distance].
[b]Note:[/b] The Soft High and Soft Ultra settings will automatically multiply shadow blur by 1.5× and 2× respectively to make better use of the increased sample count. This increased blur also improves stability of dynamic object shadows.

4
servers/rendering_server.cpp
View File

@ -2794,12 +2794,12 @@ RenderingServer::RenderingServer() {
GLOBAL_DEF("rendering/shadows/directional_shadow/size", 4096);
GLOBAL_DEF("rendering/shadows/directional_shadow/size.mobile", 2048);
ProjectSettings::get_singleton()->set_custom_property_info("rendering/shadows/directional_shadow/size", PropertyInfo(Variant::INT, "rendering/shadows/directional_shadow/size", PROPERTY_HINT_RANGE, "256,16384"));
GLOBAL_DEF("rendering/shadows/directional_shadow/soft_shadow_quality", 3);
GLOBAL_DEF("rendering/shadows/directional_shadow/soft_shadow_quality", 2);
GLOBAL_DEF("rendering/shadows/directional_shadow/soft_shadow_quality.mobile", 0);
ProjectSettings::get_singleton()->set_custom_property_info("rendering/shadows/directional_shadow/soft_shadow_quality", PropertyInfo(Variant::INT, "rendering/shadows/directional_shadow/soft_shadow_quality", PROPERTY_HINT_ENUM, "Hard (Fastest),Soft Very Low (Faster),Soft Low (Fast),Soft Medium (Average),Soft High (Slow),Soft Ultra (Slowest)"));
GLOBAL_DEF("rendering/shadows/directional_shadow/16_bits", true);
GLOBAL_DEF("rendering/shadows/shadows/soft_shadow_quality", 3);
GLOBAL_DEF("rendering/shadows/shadows/soft_shadow_quality", 2);
GLOBAL_DEF("rendering/shadows/shadows/soft_shadow_quality.mobile", 0);
ProjectSettings::get_singleton()->set_custom_property_info("rendering/shadows/shadows/soft_shadow_quality", PropertyInfo(Variant::INT, "rendering/shadows/shadows/soft_shadow_quality", PROPERTY_HINT_ENUM, "Hard (Fastest),Soft Very Low (Faster),Soft Low (Fast),Soft Medium (Average),Soft High (Slow),Soft Ultra (Slowest)"));