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GS-hw: Optimize blending when ALPHA.A is equal to ALPHA.B. 

Set ALPHA A B to 0 (Cs), and ALPHA.C to 0 (As).
This commit is contained in:
lightningterror 2022-03-05 19:51:58 +01:00
parent fa78e1295a
commit 22dfe05287
1 changed files with 17 additions and 7 deletions
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24
pcsx2/GS/Renderers/HW/GSRendererNew.cpp
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@ -784,16 +784,30 @@ void GSRendererNew::EmulateBlending(bool& DATE_PRIMID, bool& DATE_BARRIER)
m_conf.ps.blend_c = ALPHA.C;
m_conf.ps.blend_d = ALPHA.D;
if (m_conf.ps.blend_a == m_conf.ps.blend_b)
{
// A == B
// (A - B) * C will be 0 so set A B to Cs, C to As
m_conf.ps.blend_a = 0;
m_conf.ps.blend_b = 0;
m_conf.ps.blend_c = 0;
}
else if (m_conf.ps.blend_c == 2)
{
// Require the fix alpha vlaue
m_conf.cb_ps.TA_MaxDepth_Af.a = static_cast<float>(ALPHA.FIX) / 128.0f;
}
if (accumulation_blend)
{
// Keep HW blending to do the addition/subtraction
m_conf.blend = {blend_index, 0, false, true, false};
if (ALPHA.A == 2)
if (m_conf.ps.blend_a == 2)
{
// The blend unit does a reverse subtraction so it means
// the shader must output a positive value.
// Replace 0 - Cs by Cs - 0
m_conf.ps.blend_a = ALPHA.B;
m_conf.ps.blend_a = m_conf.ps.blend_b;
m_conf.ps.blend_b = 2;
}
// Remove the addition/substraction from the SW blending
@ -804,7 +818,7 @@ void GSRendererNew::EmulateBlending(bool& DATE_PRIMID, bool& DATE_BARRIER)
}
else if (blend_mix)
{
m_conf.blend = {blend_index, ALPHA.FIX, ALPHA.C == 2, false, true};
m_conf.blend = {blend_index, ALPHA.FIX, m_conf.ps.blend_c == 2, false, true};
m_conf.ps.blend_mix = 1;
if (blend_mix1)
@ -847,10 +861,6 @@ void GSRendererNew::EmulateBlending(bool& DATE_PRIMID, bool& DATE_BARRIER)
else
m_conf.require_one_barrier |= !blend_non_recursive;
}
// Require the fix alpha vlaue
if (ALPHA.C == 2)
m_conf.cb_ps.TA_MaxDepth_Af.a = static_cast<float>(ALPHA.FIX) / 128.0f;
}
else
{