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GS/HW: Further adjust how we handle RT alpha in blending. 

Check whenever RT alpha min is equal or higher than RT alpha max / 2.
This will allow us to use the min value as a more accurate option than
the actual value since it will be less accurate.
This commit is contained in:
lightningterror 2023-08-15 19:04:08 +02:00
parent d49323c7c4
commit 1a79e23b12
1 changed files with 40 additions and 14 deletions
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54
pcsx2/GS/Renderers/HW/GSRendererHW.cpp
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@ -3505,6 +3505,9 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
GL_INS("Draw AlphaMinMax: %d-%d, RT AlphaMinMax: %d-%d", GetAlphaMinMax().min, GetAlphaMinMax().max, rt_alpha_min, rt_alpha_max);
#endif
bool blend_ad_improved = false;
const bool alpha_mask = (m_cached_ctx.FRAME.FBMSK & 0xFF000000) == 0xFF000000;
// When AA1 is enabled and Alpha Blending is disabled, alpha blending done with coverage instead of alpha.
// We use a COV value of 128 (full coverage) in triangles (except the edge geometry, which we can't do easily).
if (IsCoverageAlpha())
@ -3526,6 +3529,13 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
AFIX = 128;
m_conf.ps.blend_c = 2;
}
// Check whenever we can use rt alpha min as the new alpha value, will be more accurate.
else if (!alpha_mask && (rt_alpha_min >= (rt_alpha_max / 2)))
{
AFIX = rt_alpha_min;
m_conf.ps.blend_c = 2;
blend_ad_improved = true;
}
}
// Get alpha value
@ -3582,7 +3592,7 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
// Replace Ad with As, blend flags will be used from As since we are chaging the blend_index value.
// Must be done before index calculation, after blending equation optimizations
const bool blend_ad = m_conf.ps.blend_c == 1;
bool blend_ad_alpha_masked = blend_ad && (m_cached_ctx.FRAME.FBMSK & 0xFF000000) == 0xFF000000;
bool blend_ad_alpha_masked = blend_ad && alpha_mask;
if (((GSConfig.AccurateBlendingUnit >= AccBlendLevel::Basic) || (COLCLAMP.CLAMP == 0))
&& g_gs_device->Features().texture_barrier && blend_ad_alpha_masked)
m_conf.ps.blend_c = 0;
@ -3629,7 +3639,7 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
// BLEND_HW_CLR1 with Ad, BLEND_HW_CLR3 Cs > 0.5f will require sw blend.
// BLEND_HW_CLR1 with As/F and BLEND_HW_CLR2 can be done in hw.
const bool clr_blend = !!(blend_flag & (BLEND_HW_CLR1 | BLEND_HW_CLR2 | BLEND_HW_CLR3));
bool clr_blend1_2 = (blend_flag & (BLEND_HW_CLR1 | BLEND_HW_CLR2)) && (m_conf.ps.blend_c != 1) // Make sure it isn't an Ad case
bool clr_blend1_2 = (blend_flag & (BLEND_HW_CLR1 | BLEND_HW_CLR2)) && (m_conf.ps.blend_c != 1) && !blend_ad_improved // Make sure it isn't an Ad case
&& !m_draw_env->PABE.PABE // No PABE as it will require sw blending.
&& (COLCLAMP.CLAMP) // Let's add a colclamp check too, hw blend will clamp to 0-1.
&& !(one_barrier || m_conf.require_full_barrier); // Also don't run if there are barriers present.
@ -3642,17 +3652,17 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
// Condition 1: Require full sw blend for full barrier.
// Condition 2: One barrier is already enabled, prims don't overlap so let's use sw blend instead.
const bool prefer_sw_blend = m_conf.require_full_barrier || (one_barrier && m_prim_overlap == PRIM_OVERLAP_NO);
// SW Blend is (nearly) free. Let's use it.
const bool no_prim_overlap = (m_prim_overlap == PRIM_OVERLAP_NO);
const bool impossible_or_free_blend = (blend_flag & BLEND_A_MAX) // Impossible blending
|| blend_non_recursive // Free sw blending, doesn't require barriers or reading fb
|| accumulation_blend // Mix of hw/sw blending
const bool free_blend = blend_non_recursive // Free sw blending, doesn't require barriers or reading fb
|| accumulation_blend; // Mix of hw/sw blending
const bool blend_requires_barrier = (blend_flag & BLEND_A_MAX) // Impossible blending
|| (m_conf.require_full_barrier) // Another effect (for example fbmask) already requires a full barrier
// Blend can be done in a single draw, and we already need a barrier
// On fbfetch, one barrier is like full barrier
|| (one_barrier && (no_prim_overlap || features.framebuffer_fetch))
|| ((alpha_c2_high_one || alpha_c0_high_max_one) && no_prim_overlap);
|| ((alpha_c2_high_one || alpha_c0_high_max_one) && no_prim_overlap)
// Ad blends are completely wrong without sw blend (Ad is 0.5 not 1 for 128). We can spare a barrier for it.
|| ((blend_ad || blend_ad_improved) && no_prim_overlap);
switch (GSConfig.AccurateBlendingUnit)
{
@ -3679,12 +3689,19 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
color_dest_blend &= !prefer_sw_blend;
// If prims don't overlap prefer full sw blend on blend_ad_alpha_masked cases.
accumulation_blend &= !(prefer_sw_blend || (blend_ad_alpha_masked && m_prim_overlap == PRIM_OVERLAP_NO));
sw_blending |= impossible_or_free_blend;
// Ad blends are completely wrong without sw blend (Ad is 0.5 not 1 for 128). We can spare a barrier for it.
sw_blending |= blend_ad && no_prim_overlap;
// Enable sw blending for barriers.
sw_blending |= blend_requires_barrier;
// Try to do hw blend for clr2 case.
sw_blending &= !clr_blend1_2;
// Do not run BLEND MIX if sw blending is already present, it's less accurate
// blend_ad_improved should only run if no other barrier blend is enabled, otherwise restore bit values.
if (blend_ad_improved && (sw_blending || prefer_sw_blend))
{
AFIX = 0;
m_conf.ps.blend_c = 1;
}
// Enable sw blending for free blending, should be done after blend_ad_improved check.
sw_blending |= free_blend;
// Do not run BLEND MIX if sw blending is already present, it's less accurate.
blend_mix &= !sw_blending;
sw_blending |= blend_mix;
// Disable dithering on blend mix.
@ -3726,10 +3743,19 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
// Disable accumulation blend when there is fbmask with no overlap, will be faster.
color_dest_blend &= !fbmask_no_overlap;
accumulation_blend &= !fbmask_no_overlap;
sw_blending |= accumulation_blend || blend_non_recursive || fbmask_no_overlap;
// Blending requires reading the framebuffer when there's no overlap.
sw_blending |= fbmask_no_overlap;
// Try to do hw blend for clr2 case.
sw_blending &= !clr_blend1_2;
// Do not run BLEND MIX if sw blending is already present, it's less accurate
// blend_ad_improved should only run if no other barrier blend is enabled, otherwise restore bit values.
if (blend_ad_improved && (sw_blending || fbmask_no_overlap))
{
AFIX = 0;
m_conf.ps.blend_c = 1;
}
// Enable sw blending for free blending, should be done after blend_ad_improved check.
sw_blending |= accumulation_blend || blend_non_recursive;
// Do not run BLEND MIX if sw blending is already present, it's less accurate.
blend_mix &= !sw_blending;
sw_blending |= blend_mix;
// Disable dithering on blend mix.