GS: Clear current/merge textures on hardware reset

pcsx2/GS/GS.cpp

@@ -496,6 +496,10 @@ int GSfreeze(FreezeAction mode, freezeData* data)
 		}
 		else if (mode == FreezeAction::Load)
 		{
+			// Since Defrost doesn't do a hardware reset (since it would be clearing
+			// local memory just before it's overwritten), we have to manually wipe
+			// out the current textures.
+			g_gs_device->ClearCurrent();
 			return g_gs_renderer->Defrost(data);
 		}
 	}

pcsx2/GS/Renderers/Common/GSDevice.cpp

@@ -315,6 +315,21 @@ void GSDevice::StretchRect(GSTexture* sTex, GSTexture* dTex, const GSVector4& dR
 	StretchRect(sTex, GSVector4(0, 0, 1, 1), dTex, dRect, shader, linear);
 }
 
+void GSDevice::ClearCurrent()
+{
+	m_current = nullptr;
+
+	delete m_merge;
+	delete m_weavebob;
+	delete m_blend;
+	delete m_target_tmp;
+
+	m_merge = nullptr;
+	m_weavebob = nullptr;
+	m_blend = nullptr;
+	m_target_tmp = nullptr;
+}
+
 void GSDevice::Merge(GSTexture* sTex[3], GSVector4* sRect, GSVector4* dRect, const GSVector2i& fs, const GSRegPMODE& PMODE, const GSRegEXTBUF& EXTBUF, const GSVector4& c)
 {
 	// KH:COM crashes at startup when booting *through the bios* due to m_merge being NULL.

pcsx2/GS/Renderers/Common/GSDevice.h

@@ -727,6 +727,7 @@ public:
 	__fi FeatureSupport Features() const { return m_features; }
 	__fi GSTexture* GetCurrent() const { return m_current; }
 
+	void ClearCurrent();
 	void Merge(GSTexture* sTex[3], GSVector4* sRect, GSVector4* dRect, const GSVector2i& fs, const GSRegPMODE& PMODE, const GSRegEXTBUF& EXTBUF, const GSVector4& c);
 	void Interlace(const GSVector2i& ds, int field, int mode, float yoffset);
 	void FXAA();

pcsx2/GS/Renderers/Common/GSRenderer.cpp

@@ -60,6 +60,15 @@ GSRenderer::GSRenderer() = default;
 
 GSRenderer::~GSRenderer() = default;
 
+void GSRenderer::Reset(bool hardware_reset)
+{
+	// clear the current display texture
+	if (hardware_reset)
+		g_gs_device->ClearCurrent();
+
+	GSState::Reset(hardware_reset);
+}
+
 void GSRenderer::Destroy()
 {
 }

pcsx2/GS/Renderers/Common/GSRenderer.h

@@ -51,6 +51,8 @@ public:
 	GSRenderer();
 	virtual ~GSRenderer();
 
+	virtual void Reset(bool hardware_reset) override;
+
 	virtual void Destroy();
 
 	virtual void VSync(u32 field, bool registers_written);