gsdx-ogl-wnd: Make the HW renderer "work" on the opensource driver

* replace most OGL_FREE_DRIVER with a dynamic detection. Remains the context creation. Closed drivers need 3.3
* Add the CopySubImage fallback


git-svn-id: http://pcsx2.googlecode.com/svn/branches/gsdx-ogl-wnd@5647 96395faa-99c1-11dd-bbfe-3dabce05a288

plugins/GSdx/GLLoader.cpp

@@ -103,6 +103,7 @@ namespace GLLoader {
 	bool found_geometry_shader = true;
 	bool found_GL_NV_copy_image = false;
 	bool found_GL_ARB_copy_image = false;
+	bool found_only_gl30	= false;
 
     bool check_gl_version(uint32 major, uint32 minor) {
 
@@ -129,6 +130,10 @@ namespace GLLoader {
 			found_geometry_shader = !!theApp.GetConfig("override_geometry_shader", -1);
 			fprintf(stderr, "Override geometry shaders detection\n");
 		}
+		if ( (major_gl == 3) && minor_gl < 3) {
+			// Opensource driver spotted
+			found_only_gl30 = true;
+		}
 
 		if ( (major_gl < major) || ( major_gl == major && minor_gl < minor ) ) {
 			fprintf(stderr, "OPENGL %d.%d is not supported\n", major, minor);
@@ -263,6 +268,13 @@ namespace GLLoader {
 			found_GL_ARB_separate_shader_objects = !!theApp.GetConfig("override_GL_ARB_separate_shader_objects", -1);
 			fprintf(stderr, "Override GL_ARB_separate_shader_objects detection\n");
 		}
+		if (theApp.GetConfig("ovveride_GL_ARB_copy_image", -1) != -1) {
+			// Same extension so override both
+			found_GL_ARB_copy_image = !!theApp.GetConfig("override_GL_ARB_copy_image", -1);
+			found_GL_NV_copy_image = !!theApp.GetConfig("override_GL_ARB_copy_image", -1);
+			fprintf(stderr, "Override GL_ARB_copy_image detection\n");
+			fprintf(stderr, "Override GL_NV_copy_image detection\n");
+		}
 
 		return true;
 	}

plugins/GSdx/GLLoader.h

@@ -133,4 +133,5 @@ namespace GLLoader {
 	extern bool found_GL_NV_copy_image;
 	extern bool found_geometry_shader;
 	extern bool fglrx_buggy_driver;
+	extern bool found_only_gl30;
 }

plugins/GSdx/GSDeviceOGL.cpp

@@ -181,11 +181,7 @@ bool GSDeviceOGL::Create(GSWnd* wnd)
 	if (m_window == NULL) {
 		GLLoader::init_gl_function();
 
-#ifdef OGL_FREE_DRIVER
 		if (!GLLoader::check_gl_version(3, 0)) return false;
-#else
-		if (!GLLoader::check_gl_version(3, 3)) return false;
-#endif
 
 		if (!GLLoader::check_gl_supported_extension()) return false;
 	}
@@ -884,7 +880,17 @@ void GSDeviceOGL::CopyRect(GSTexture* st, GSTexture* dt, const GSVector4i& r)
 				r.width(), r.height(), 1);
 #endif
 	} else {
-		// FIXME fallback for open source driver
+
+		GSTextureOGL* st_ogl = (GSTextureOGL*) st;
+		GSTextureOGL* dt_ogl = (GSTextureOGL*) dt;
+
+		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, m_fbo_read);
+
+		st_ogl->AttachRead(GL_COLOR_ATTACHMENT0);
+		dt_ogl->EnableUnit(0);
+		glCopyTexSubImage2D(dt_ogl->GetTarget(), 0, r.x, r.y, r.x, r.y, r.width(), r.height());
+
+		gl_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 	}
 
 #if 0
@@ -1346,11 +1352,12 @@ void GSDeviceOGL::CompileShaderFromSource(const std::string& glsl_file, const st
 	// Build a header string
 	// *****************************************************
 	// First select the version (must be the first line so we need to generate it
-#ifdef OGL_FREE_DRIVER
-	std::string version = "#version 130\n";
-#else
-	std::string version = "#version 330\n";
-#endif
+	std::string version;
+	if (GLLoader::found_only_gl30) {
+		version = "#version 130\n";
+	} else {
+		version = "#version 330\n";
+	}
 	if (GLLoader::found_GL_ARB_shading_language_420pack) {
 		version += "#extension GL_ARB_shading_language_420pack: require\n";
 	} else {
@@ -1363,14 +1370,13 @@ void GSDeviceOGL::CompileShaderFromSource(const std::string& glsl_file, const st
 		//	version += "#define NO_STRUCT 1\n";
 		//}
 	} else {
-#ifdef OGL_FREE_DRIVER
+		if (GLLoader::found_only_gl30)
 			version += "#define DISABLE_SSO\n";
-#endif
 	}
-#ifdef OGL_FREE_DRIVER
+	if (GLLoader::found_only_gl30) {
 		version += "#extension GL_ARB_explicit_attrib_location : require\n";
 		version += "#extension GL_ARB_uniform_buffer_object : require\n";
-#endif
+	}
 
 	// Allow to puts several shader in 1 files
 	std::string shader_type;

plugins/GSdx/GSTextureOGL.cpp

@@ -149,6 +149,12 @@ void GSTextureOGL::Attach(GLenum attachment)
 	//fprintf(stderr, "FB status %x\n", gl_CheckFramebufferStatus(GL_FRAMEBUFFER));
 }
 
+void GSTextureOGL::AttachRead(GLenum attachment)
+{
+	gl_FramebufferTexture2D(GL_READ_FRAMEBUFFER, attachment, m_texture_target, m_texture_id, 0);
+	glReadBuffer(attachment);
+}
+
 bool GSTextureOGL::Update(const GSVector4i& r, const void* data, int pitch)
 {
 	if (m_type == GSTexture::DepthStencil || m_type == GSTexture::Offscreen) ASSERT(0);

plugins/GSdx/GSTextureOGL.h

@@ -44,6 +44,7 @@ class GSTextureOGL : public GSTexture
 
 		void EnableUnit(uint32 unit);
 		void Attach(GLenum attachment);
+		void AttachRead(GLenum attachment);
 
 		bool IsBackbuffer() { return (m_type == GSTexture::Backbuffer); }
 		bool IsDss() { return (m_type == GSTexture::DepthStencil); }

plugins/GSdx/config.h

@@ -41,6 +41,5 @@
 #define ENABLE_OGL_DEBUG   // Create a debug context and check opengl command status. Allow also to dump various textures/states.
 #endif
 
-#ifdef EGL_API
-#define OGL_FREE_DRIVER
-#endif
+// Allow to create only a 3.0 context for opensource driver
+//#define OGL_FREE_DRIVER