gsdx-hw: Add an OI hack for Sonic Unleashed.

It will allow to render the shadows properly.

Rendering pattern is:
Save RG channel with a kind of a TS (replaced by a copy in this hack),
compute shadow in RG,
save result in alpha with a TS,
Restore RG channel that we previously copied to render shadows.

plugins/GSdx/Renderers/HW/GSRendererHW.cpp

@@ -1273,6 +1273,7 @@ GSRendererHW::Hacks::Hacks()
 	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::FFX, CRC::RegionCount, &GSRendererHW::OI_FFX));
 	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::MetalSlug6, CRC::RegionCount, &GSRendererHW::OI_MetalSlug6));
 	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::RozenMaidenGebetGarden, CRC::RegionCount, &GSRendererHW::OI_RozenMaidenGebetGarden));
+	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::SonicUnleashed, CRC::RegionCount, &GSRendererHW::OI_SonicUnleashed));
 	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::StarWarsForceUnleashed, CRC::RegionCount, &GSRendererHW::OI_StarWarsForceUnleashed));
 	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::SuperManReturns, CRC::RegionCount, &GSRendererHW::OI_SuperManReturns));
 	m_oi_list.push_back(HackEntry<OI_Ptr>(CRC::ArTonelico2, CRC::RegionCount, &GSRendererHW::OI_ArTonelico2));
@@ -1665,6 +1666,38 @@ bool GSRendererHW::OI_RozenMaidenGebetGarden(GSTexture* rt, GSTexture* ds, GSTex
 	return true;
 }
 
+bool GSRendererHW::OI_SonicUnleashed(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t)
+{
+	// Rendering pattern is:
+	// Save RG channel with a kind of a TS (replaced by a copy in this hack),
+	// compute shadow in RG,
+	// save result in alpha with a TS,
+	// Restore RG channel that we previously copied to render shadows.
+
+	GIFRegTEX0 Texture = m_context->TEX0;
+
+	GIFRegTEX0 Frame;
+	Frame.TBW = m_context->FRAME.FBW;
+	Frame.TBP0 = m_context->FRAME.FBP;
+	Frame.TBP0 = m_context->FRAME.Block();
+	Frame.PSM = m_context->FRAME.PSM;
+
+	if ((!PRIM->TME) || (GSLocalMemory::m_psm[Texture.PSM].bpp != 16) || (GSLocalMemory::m_psm[Frame.PSM].bpp != 16))
+		return true;
+
+	if ((Texture.TBP0 == Frame.TBP0) || (Frame.TBW != 16 && Texture.TBW != 16))
+		return true;
+
+	GSTextureCache::Target* src = m_tc->LookupTarget(Texture, m_width, m_height, GSTextureCache::RenderTarget, true);
+	GSVector4 sRect(0, 0, 1, 1);
+	GSVector4 dRect(0, 0, m_width, m_height);
+
+	m_dev->StretchRect(src->m_texture, sRect, rt, dRect, true, true, true, false);
+	GL_INS("OI_SonicUnleashed replace draw by a copy");
+
+	return false;
+}
+
 bool GSRendererHW::OI_StarWarsForceUnleashed(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t)
 {
 	uint32 FBP = m_context->FRAME.Block();

plugins/GSdx/Renderers/HW/GSRendererHW.h

@@ -56,6 +56,7 @@ class GSRendererHW : public GSRenderer
 	bool OI_FFX(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);
 	bool OI_MetalSlug6(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);
 	bool OI_RozenMaidenGebetGarden(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);
+	bool OI_SonicUnleashed(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);
 	bool OI_StarWarsForceUnleashed(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);
 	bool OI_PointListPalette(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);
 	bool OI_SuperManReturns(GSTexture* rt, GSTexture* ds, GSTextureCache::Source* t);