GS/HW: Fix pabe optimization condition.

We should check only if As max is 128, also make sure we are checking the original Alpha C value as it could have been modified for an optimization.

pcsx2/GS/Renderers/HW/GSRendererHW.cpp

@@ -4431,13 +4431,12 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, const boo
 	if (m_draw_env->PABE.PABE && GetAlphaMinMax().min < 128)
 	{
 		// Breath of Fire Dragon Quarter, Strawberry Shortcake, Super Robot Wars, Cartoon Network Racing, Simple 2000 Series Vol.81, SOTC.
-		if (GetAlphaMinMax().max == 128 && m_conf.ps.blend_a == 0 && ((blend.dst == GSDevice::INV_SRC1_COLOR)
-			|| (blend.dst == GSDevice::INV_DST_ALPHA)
-			|| (blend.dst == GSDevice::INV_CONST_COLOR)))
+		// Alpha C could have been modified as an optimization so check the original value.
+		if (GetAlphaMinMax().max == 128 && m_conf.ps.blend_a == 0 && ALPHA.C == 0 && ((blend.dst == GSDevice::INV_SRC1_COLOR) || (blend.dst == GSDevice::INV_CONST_COLOR)))
 		{
 			// PABE disable blending:
 			// We can disable blending here as an optimization since alpha max is 128
-			// which if alpha is 1 in the formula Cs*Alpha + Cd*(1 - Alpha) will give us a result of Cs.
+			// which if alpha is 1 in the formula Cs*As + Cd*(1 - As) will give us a result of Cs.
 			m_conf.blend = {};
 			m_conf.ps.no_color1 = true;
 			m_conf.ps.blend_a = m_conf.ps.blend_b = m_conf.ps.blend_c = m_conf.ps.blend_d = 0;
@@ -4476,9 +4475,13 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, const boo
 				// PABE sw blend:
 				m_conf.ps.pabe = !(accumulation_blend || blend_mix);
 			}
-
-			GL_INS("PABE mode %s", m_conf.ps.pabe ? "ENABLED" : "DISABLED");
 		}
+
+		GL_INS("PABE mode %s", m_conf.ps.pabe ? "ENABLED" : "DISABLED");
+
+		// TODO: We can expand pabe hw to Cd*(1 - Alpha) where alpha is As or Af and replace the formula with Cs + 0 when As < 128,
+		// but need to find test cases where it makes a difference,
+		// C 12 Final Resistance triggers it but there's no difference and it's a psx game.
 	}
 
 	if (color_dest_blend)
@@ -4811,9 +4814,9 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, const boo
 
 		if (m_conf.ps.blend_c == 2 && (m_conf.ps.blend_hw == static_cast<u8>(HWBlendType::SRC_ALPHA_DST_FACTOR)
 			|| m_conf.ps.blend_hw == static_cast<u8>(HWBlendType::SRC_HALF_ONE_DST_FACTOR)
-			|| m_conf.blend_multi_pass.blend_hw == static_cast<u8>(HWBlendType::SRC_ALPHA_DST_FACTOR)
 			|| m_conf.ps.blend_hw == static_cast<u8>(HWBlendType::SRC_INV_DST_BLEND_HALF)
-			|| m_conf.ps.blend_hw == static_cast<u8>(HWBlendType::INV_SRC_DST_BLEND_HALF)))
+			|| m_conf.ps.blend_hw == static_cast<u8>(HWBlendType::INV_SRC_DST_BLEND_HALF)
+			|| m_conf.blend_multi_pass.blend_hw == static_cast<u8>(HWBlendType::SRC_ALPHA_DST_FACTOR)))
 		{
 			m_conf.cb_ps.TA_MaxDepth_Af.a = static_cast<float>(AFIX) / 128.0f;
 		}