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GS-hw: Further optimize blending equations. 

Allow to run free sw blend with no texture barriers, more speed for all renderers.

CLAMP 1, negative result will be clamped to 0.
Condition 1:
(0  - Cs)*Alpha +  0, (0  - Cd)*Alpha +  0
Condition 2:
Alpha is either As or F higher than 1.0f
(0  - Cd)*Alpha  + Cd, (0  - Cs)*F  + Cs
This commit is contained in:
lightningterror 2022-05-10 18:14:50 +02:00
parent 1d1ee314ca
commit 50bb362dc9
1 changed files with 15 additions and 0 deletions
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15
pcsx2/GS/Renderers/HW/GSRendererHW.cpp
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@ -2604,6 +2604,21 @@ void GSRendererHW::EmulateBlending(bool& DATE_PRIMID, bool& DATE_BARRIER, bool&
m_conf.ps.blend_a = 0;
m_conf.ps.blend_b = 0;
}
else if (m_env.COLCLAMP.CLAMP && m_conf.ps.blend_a == 2
&& (m_conf.ps.blend_d == 2 || (m_conf.ps.blend_b == m_conf.ps.blend_d && (alpha_c0_high_min_one || alpha_c2_high_one))))
{
// CLAMP 1, negative result will be clamped to 0.
// Condition 1:
// (0 - Cs)*Alpha + 0, (0 - Cd)*Alpha + 0
// Condition 2:
// Alpha is either As or F higher than 1.0f
// (0 - Cd)*Alpha + Cd, (0 - Cs)*F + Cs
// Results will be 0.0f, make sure D is set to 2.
m_conf.ps.blend_a = 0;
m_conf.ps.blend_b = 0;
m_conf.ps.blend_c = 0;
m_conf.ps.blend_d = 2;
}
// Ad cases, alpha write is masked, one barrier is enough, for d3d11 read the fb
// Replace Ad with As, blend flags will be used from As since we are chaging the blend_index value.