fix patchy fog at uncapped fps

nukeulater · Dec 26, 2023 · 1ffc19d · 1ffc19d
1 parent d8d42cc
commit 1ffc19d
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Showing 4 changed files with 70 additions and 0 deletions.
diff --git a/xlive/Blam/Engine/rasterizer/dx9/rasterizer_dx9_fog.cpp b/xlive/Blam/Engine/rasterizer/dx9/rasterizer_dx9_fog.cpp
@@ -0,0 +1,63 @@
+#include "stdafx.h"
+
+#include "rasterizer_dx9_fog.h"
+
+#include "Util/Hooks/Hook.h"
+
+real32 g_rasterizer_fog_dt = 0.0f;
+
+void __declspec(naked) rasterizer_fog_constant_velocity_update()
+{
+	static real32 fog_wind_x_axis_velocity_factor1 = 30.0f;
+#define k_delta_time_stack_location (-10h)
+	__asm
+	{
+		pop eax
+
+		// esi - atmospheric fog ptr, [esp+1Ch + k_delta_time_stack_location] - dt
+		// edi - tag definition data
+		// xmm0 to this point dt as well
+		movss xmm1, dword ptr[edi+44h]
+		mulss xmm1, fog_wind_x_axis_velocity_factor1
+		movss xmm2, dword ptr[esi]
+		mulss xmm2, dword ptr[esi + 10h]
+		addss xmm1, xmm2
+		mulss xmm1, xmm0 // multiply by dt
+		movss dword ptr[ebp], xmm1
+
+		// repeat the code block above 1 more time
+		movss xmm1, dword ptr[edi + 44h + 4h]
+		mulss xmm1, fog_wind_x_axis_velocity_factor1
+		movss xmm2, dword ptr[esi + 4]
+		mulss xmm2, dword ptr[esi + 10h]
+		addss xmm1, xmm2
+		mulss xmm1, xmm0 // multiply by dt
+		movss dword ptr[ebp + 4], xmm1
+
+		// this block without addss
+		movss xmm1, dword ptr[edi + 44h + 8h]
+		mulss xmm1, fog_wind_x_axis_velocity_factor1
+		mulss xmm1, xmm0 // multiply by dt
+		movss dword ptr[ebp + 8], xmm1
+
+		pop edi
+		pop esi
+
+		// push return back
+		push eax
+		retn
+	}
+#undef k_delta_time_stack_location
+}
+
+void rasterizer_fog_apply_patches()
+{
+	Codecave(Memory::GetAddress(0x2773B5), rasterizer_fog_constant_velocity_update, 42);
+	// xorps xmm0, xmm0, 2 nops
+	BYTE xmm0_clear[] = { 0x0F, 0x57, 0xC0, 0x90, 0x90 };
+	WriteBytes(Memory::GetAddress(0x2776D4), xmm0_clear, sizeof(xmm0_clear));
+	WriteBytes(Memory::GetAddress(0x2776E8), xmm0_clear, sizeof(xmm0_clear));
+	WriteBytes(Memory::GetAddress(0x277700), xmm0_clear, sizeof(xmm0_clear));
+
+	return;
+}
diff --git a/xlive/Blam/Engine/rasterizer/dx9/rasterizer_dx9_fog.h b/xlive/Blam/Engine/rasterizer/dx9/rasterizer_dx9_fog.h
@@ -0,0 +1,3 @@
+#pragma once
+
+void rasterizer_fog_apply_patches();
diff --git a/xlive/H2MOD.cpp b/xlive/H2MOD.cpp
@@ -38,6 +38,7 @@
 #include "Blam/Engine/units/units.h"
 #include "Blam/Engine/widgets/cloth.h"
 #include "Blam/Engine/widgets/liquid.h"
+#include "Blam/Engine/rasterizer/dx9/rasterizer_dx9_fog.h"
 
 #include "H2MOD/EngineHooks/EngineHooks.h"
 #include "H2MOD/GUI/ImGui_Integration/ImGui_Handler.h"
@@ -938,6 +939,7 @@ void H2MOD::ApplyHooks() {
 		cloth_apply_patches();
 		camera_apply_patches();
 		player_control_apply_patches();
+		rasterizer_fog_apply_patches();
 	}
 	else {
 		LOG_INFO_GAME("{} - applying dedicated server hooks", __FUNCTION__);

diff --git a/xlive/Project_Cartographer.vcxproj b/xlive/Project_Cartographer.vcxproj
@@ -517,6 +517,7 @@
     <ClCompile Include="Blam\Engine\game\players.cpp" />
     <ClCompile Include="Blam\Engine\physics\havok_memory.cpp" />
     <ClCompile Include="Blam\Engine\rasterizer\dx9\rasterizer_dx9_main.cpp" />
+    <ClCompile Include="Blam\Engine\rasterizer\dx9\rasterizer_dx9_fog.cpp" />
     <ClCompile Include="Blam\Engine\rasterizer\rasterizer_lens_flares.cpp" />
     <ClCompile Include="Blam\Engine\rasterizer\rasterizer_settings.cpp" />
     <ClCompile Include="Blam\Engine\render\render_cameras.cpp" />
@@ -830,6 +831,7 @@
     <ClInclude Include="Blam\Engine\physics\havok.h" />
     <ClInclude Include="Blam\Engine\physics\havok_memory.h" />
     <ClInclude Include="Blam\Engine\physics\physics_models.h" />
+    <ClInclude Include="Blam\Engine\rasterizer\dx9\rasterizer_dx9_fog.h" />
     <ClInclude Include="Blam\Engine\rasterizer\dx9\rasterizer_dx9_main.h" />
     <ClInclude Include="Blam\Engine\rasterizer\rasterizer_lens_flares.h" />
     <ClInclude Include="Blam\Engine\rasterizer\rasterizer_settings.h" />
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		#pragma once

		void rasterizer_fog_apply_patches();