From 9ff6003dfc4a5193d27a8058d8f02eb5495ce2bf Mon Sep 17 00:00:00 2001
From: kd-11 <karokidii@gmail.com>
Date: Tue, 18 Apr 2023 13:19:57 +0300
Subject: [PATCH] rsx: Add Ultra shader precision setting for costly accuracy
 settings

---
 rpcs3/Emu/RSX/Program/GLSLCommon.cpp | 42 ++++++++++++++++++----------
 rpcs3/Emu/system_config_types.cpp    |  1 +
 rpcs3/Emu/system_config_types.h      |  1 +
 rpcs3/rpcs3qt/emu_settings.cpp       |  1 +
 4 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/rpcs3/Emu/RSX/Program/GLSLCommon.cpp b/rpcs3/Emu/RSX/Program/GLSLCommon.cpp
index edc74dd4ea..25a89883d8 100644
--- a/rpcs3/Emu/RSX/Program/GLSLCommon.cpp
+++ b/rpcs3/Emu/RSX/Program/GLSLCommon.cpp
@@ -1,10 +1,11 @@
 #include "stdafx.h"
-#include "Utilities/StrFmt.h"
 
 #include "GLSLCommon.h"
 #include "RSXFragmentProgram.h"
 
-#include "../gcm_enums.h"
+#include "Emu/system_config.h"
+#include "Emu/RSX/gcm_enums.h"
+#include "Utilities/StrFmt.h"
 
 namespace program_common
 {
@@ -1245,18 +1246,31 @@ namespace glsl
 
 		// Interpolate the input attributes manually.
 		// Matches AMD behavior where gl_BaryCoordSmoothAMD only provides x and y with z being autogenerated.
-		OS << fmt::replace_all(
-			"\n"
-			"vec4 _interpolate_varying3(const in vec4[3] v)\n"
-			"{\n"
-			"	const double _gl_BaryCoord_x = double($gl_BaryCoord.x);\n"
-			"	const double _gl_BaryCoord_y = double($gl_BaryCoord.y);\n"
-			"	const double _gl_BaryCoord_z = double(1.0) - (_gl_BaryCoord_x + _gl_BaryCoord_y);\n"
-			"	return vec4(_gl_BaryCoord_x * v[0] + _gl_BaryCoord_y * v[1] + _gl_BaryCoord_z * v[2]);\n"
-			"}\n\n",
-			{
-				{ "$gl_BaryCoord", "gl_BaryCoord"s + std::string(ext_flavour) }
-			});
+		std::string interpolate_function_block;
+		if (g_cfg.video.shader_precision == gpu_preset_level::ultra)
+		{
+			interpolate_function_block =
+				"\n"
+				"vec4 _interpolate_varying3(const in vec4[3] v)\n"
+				"{\n"
+				"	const double _gl_BaryCoord_x = double($gl_BaryCoord.x);\n"
+				"	const double _gl_BaryCoord_y = double($gl_BaryCoord.y);\n"
+				"	const double _gl_BaryCoord_z = double(1.0) - (_gl_BaryCoord_x + _gl_BaryCoord_y);\n"
+				"	return vec4(_gl_BaryCoord_x * v[0] + _gl_BaryCoord_y * v[1] + _gl_BaryCoord_z * v[2]);\n"
+				"}\n\n";
+		}
+		else
+		{
+			interpolate_function_block =
+				"\n"
+				"vec4 _interpolate_varying3(const in vec4[3] v)\n"
+				"{\n"
+				"	vec3 _gl_BaryCoord = vec3($gl_BaryCoord.xy, 1.f);\n"
+				"	_gl_BaryCoord.z = dot(_gl_BaryCoord, vec3(-1.f, -1.f, 1.f));\n"
+				"	return vec4(_gl_BaryCoord.x * v[0] + _gl_BaryCoord.y * v[1] + _gl_BaryCoord.z * v[2]);\n"
+				"}\n\n";
+		}
+		OS << fmt::replace_all(interpolate_function_block, {{ "$gl_BaryCoord", "gl_BaryCoord"s + std::string(ext_flavour) }});
 
 		for (const auto& reg : varying_list)
 		{
diff --git a/rpcs3/Emu/system_config_types.cpp b/rpcs3/Emu/system_config_types.cpp
index 9dd821486d..79bd61f11c 100644
--- a/rpcs3/Emu/system_config_types.cpp
+++ b/rpcs3/Emu/system_config_types.cpp
@@ -608,6 +608,7 @@ void fmt_class_string<gpu_preset_level>::format(std::string& out, u64 arg)
 		switch (value)
 		{
 		case gpu_preset_level::_auto: return "Auto";
+		case gpu_preset_level::ultra: return "Ultra";
 		case gpu_preset_level::high: return "High";
 		case gpu_preset_level::low: return "Low";
 		}
diff --git a/rpcs3/Emu/system_config_types.h b/rpcs3/Emu/system_config_types.h
index a257416d65..4e7446d2f5 100644
--- a/rpcs3/Emu/system_config_types.h
+++ b/rpcs3/Emu/system_config_types.h
@@ -301,6 +301,7 @@ enum class zcull_precision_level
 
 enum class gpu_preset_level
 {
+	ultra,
 	high,
 	low,
 	_auto
diff --git a/rpcs3/rpcs3qt/emu_settings.cpp b/rpcs3/rpcs3qt/emu_settings.cpp
index 282f5279f5..0c30a0dbdd 100644
--- a/rpcs3/rpcs3qt/emu_settings.cpp
+++ b/rpcs3/rpcs3qt/emu_settings.cpp
@@ -947,6 +947,7 @@ QString emu_settings::GetLocalizedSetting(const QString& original, emu_settings_
 		switch (static_cast<gpu_preset_level>(index))
 		{
 		case gpu_preset_level::_auto: return tr("Auto", "Shader Precision");
+		case gpu_preset_level::ultra: return tr("Ultra", "Shader Precision");
 		case gpu_preset_level::high: return tr("High", "Shader Precision");
 		case gpu_preset_level::low: return tr("Low", "Shader Precision");
 		}