gsdx tc: implement a read function of Source texture

It will be used in the following commit

plugins/GSdx/GSTextureCache.h

@@ -129,18 +129,14 @@ protected:
 
 	// TODO: virtual void Write(Source* s, const GSVector4i& r) = 0;
 	// TODO: virtual void Write(Target* t, const GSVector4i& r) = 0;
-#ifndef DISABLE_HW_TEXTURE_CACHE
-	virtual void Read(Target* t, const GSVector4i& r) = 0;
-#endif
 
 	virtual bool CanConvertDepth() { return m_can_convert_depth; }
 
 public:
 	GSTextureCache(GSRenderer* r);
 	virtual ~GSTextureCache();
-#ifdef DISABLE_HW_TEXTURE_CACHE
 	virtual void Read(Target* t, const GSVector4i& r) = 0;
-#endif
+	virtual void Read(Source* t, const GSVector4i& r) = 0;
 	void RemoveAll();
 	void RemovePartial();
 

plugins/GSdx/GSTextureCache11.cpp

@@ -97,3 +97,27 @@ void GSTextureCache11::Read(Target* t, const GSVector4i& r)
 	}
 }
 
+void GSTextureCache11::Read(Source* t, const GSVector4i& r)
+{
+	// FIXME: copy was copyied from openGL. It is unlikely to work.
+
+	const GIFRegTEX0& TEX0 = t->m_TEX0;
+
+	if (GSTexture* offscreen  = m_renderer->m_dev->CreateOffscreen(r.width(), r.height())) {
+		m_renderer->m_dev->CopyRect(t->m_texture, offscreen, r);
+
+		GSTexture::GSMap m;
+		GSVector4i r_offscreen(0, 0, r.width(), r.height());
+
+		if (offscreen->Map(m, &r_offscreen)) {
+			GSOffset* off = m_renderer->m_mem.GetOffset(TEX0.TBP0, TEX0.TBW, TEX0.PSM);
+
+			m_renderer->m_mem.WritePixel32(m.bits, m.pitch, off, r);
+
+			offscreen->Unmap();
+		}
+
+		// FIXME invalidate data
+		m_renderer->m_dev->Recycle(offscreen);
+	}
+}

plugins/GSdx/GSTextureCache11.h

@@ -30,6 +30,7 @@ protected:
 	int Get8bitFormat() {return DXGI_FORMAT_A8_UNORM;}
 
 	void Read(Target* t, const GSVector4i& r);
+	void Read(Source* t, const GSVector4i& r);
 
 	virtual bool CanConvertDepth() { return false; }
 

plugins/GSdx/GSTextureCache9.cpp

@@ -95,3 +95,27 @@ void GSTextureCache9::Read(Target* t, const GSVector4i& r)
 	}
 }
 
+void GSTextureCache9::Read(Source* t, const GSVector4i& r)
+{
+	// FIXME: copy was copyied from openGL. It is unlikely to work.
+
+	const GIFRegTEX0& TEX0 = t->m_TEX0;
+
+	if (GSTexture* offscreen  = m_renderer->m_dev->CreateOffscreen(r.width(), r.height())) {
+		m_renderer->m_dev->CopyRect(t->m_texture, offscreen, r);
+
+		GSTexture::GSMap m;
+		GSVector4i r_offscreen(0, 0, r.width(), r.height());
+
+		if (offscreen->Map(m, &r_offscreen)) {
+			GSOffset* off = m_renderer->m_mem.GetOffset(TEX0.TBP0, TEX0.TBW, TEX0.PSM);
+
+			m_renderer->m_mem.WritePixel32(m.bits, m.pitch, off, r);
+
+			offscreen->Unmap();
+		}
+
+		// FIXME invalidate data
+		m_renderer->m_dev->Recycle(offscreen);
+	}
+}

plugins/GSdx/GSTextureCache9.h

@@ -30,6 +30,7 @@ protected:
 	int Get8bitFormat() {return D3DFMT_A8;}
 
 	void Read(Target* t, const GSVector4i& r);
+	void Read(Source* t, const GSVector4i& r);
 
 	virtual bool CanConvertDepth() { return false; }
 

plugins/GSdx/GSTextureCacheOGL.cpp

@@ -129,3 +129,28 @@ void GSTextureCacheOGL::Read(Target* t, const GSVector4i& r)
 	GL_POP();
 }
 
+void GSTextureCacheOGL::Read(Source* t, const GSVector4i& r)
+{
+	const GIFRegTEX0& TEX0 = t->m_TEX0;
+
+	// FIXME Create a get function to avoid the useless copy
+	// Note: With openGL 4.5 you can use glGetTextureSubImage
+
+	if (GSTexture* offscreen  = m_renderer->m_dev->CreateOffscreen(r.width(), r.height())) {
+		m_renderer->m_dev->CopyRect(t->m_texture, offscreen, r);
+
+		GSTexture::GSMap m;
+		GSVector4i r_offscreen(0, 0, r.width(), r.height());
+
+		if (offscreen->Map(m, &r_offscreen)) {
+			GSOffset* off = m_renderer->m_mem.GetOffset(TEX0.TBP0, TEX0.TBW, TEX0.PSM);
+
+			m_renderer->m_mem.WritePixel32(m.bits, m.pitch, off, r);
+
+			offscreen->Unmap();
+		}
+
+		// FIXME invalidate data
+		m_renderer->m_dev->Recycle(offscreen);
+	}
+}

plugins/GSdx/GSTextureCacheOGL.h

@@ -31,6 +31,7 @@ protected:
 	int Get8bitFormat() { return GL_R8;}
 
 	void Read(Target* t, const GSVector4i& r);
+	void Read(Source* t, const GSVector4i& r);
 
 public:
 	GSTextureCacheOGL(GSRenderer* r);