RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 15:37:47 +00:00
Code Issues Activity Actions

LibSoftGPU: Make blending simpler and more efficient

Browse source 
Previously, we would precalculate "alpha blend factors" on every
configuration update and then calculate the source and destination
blending factors in one go using all these factors. The idea here was
probably that we would get better performance by avoiding branching.

However, by measuring blending performance in Quake III, it seems that
this simpler version that only calculates the required factors reduces
the CPU time spent in `rasterize_triangle` by 3%.

As a bonus, `GL_SRC_ALPHA_SATURATE` is now also implemented.
This commit is contained in:
Jelle Raaijmakers 2023-02-01 21:18:53 +01:00 • committed by Andreas Kling
parent f0f9d8f1e0
commit 69b94e4235
4 changed files with 63 additions and 130 deletions
Download patch file Download diff file Expand all files Collapse all files

6
Userland/Libraries/LibSoftGPU/SIMD.h
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
* Copyright (c) 2023, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -138,4 +139,9 @@ ALWAYS_INLINE static Vector2<AK::SIMD::f32x4> to_vec2_f32x4(Vector2<AK::SIMD::i3
};
}
ALWAYS_INLINE static constexpr Vector4<AK::SIMD::f32x4> to_vec4(AK::SIMD::f32x4 v)
{
return { v, v, v, v };
}
}