gsdx-ogl: LINUX-ONLY

* add a callback for GLERROR.  Allow to breakpoint on GSDeviceOGL::DebugCallback (gdb is completely lost on amd driver, hope it is better on nvidia)
* Add some empty glsl convert to shutup some useless debugging error
* request an advance opengl context without pre 3.0 feature.


git-svn-id: http://pcsx2.googlecode.com/svn/branches/gsdx-ogl@4983 96395faa-99c1-11dd-bbfe-3dabce05a288

plugins/GSdx/GS.cpp

@@ -289,7 +289,8 @@ static int _GSopen(void** dsp, char* title, int renderer, int threads = -1)
 
 #ifdef __LINUX__
 		// Get the Xwindow from dsp.
-		s_gs->m_wnd.Attach((void*)((uint32*)(dsp)+1), false);
+		if( !s_gs->m_wnd.Attach((void*)((uint32*)(dsp)+1), false) )
+			return -1;
 #else
 		s_gs->m_wnd.Attach(*dsp, false);
 #endif

plugins/GSdx/GSDeviceOGL.cpp

@@ -159,10 +159,11 @@ bool GSDeviceOGL::Create(GSWnd* wnd)
 		}
 	}
 
-	m_window = wnd;
-
 	// FIXME disable it when code is ready
 	glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB);
+	glDebugMessageCallbackARB(&GSDeviceOGL::DebugCallback, NULL);
+
+	m_window = wnd;
 
 	// ****************************************************************
 	// Various object
@@ -1150,6 +1151,12 @@ void GSDeviceOGL::CompileShaderFromSource(const std::string& glsl_file, const st
 	free(log);
 }
 
+void GSDeviceOGL::DebugCallback(unsigned int source, unsigned int type, unsigned int id, unsigned int severity, int length, const char* message, void* userParam)
+{
+	DebugOutputToFile(source, type, id, severity, message);
+}
+
+
 void GSDeviceOGL::CheckDebugLog()
 {
        unsigned int count = 64; // max. num. of messages that will be read from the log

plugins/GSdx/GSDeviceOGL.h

@@ -228,12 +228,6 @@ class GSDeviceOGL : public GSDevice
 	PSConstantBuffer m_ps_cb_cache;
 #endif
 
-	//GLenum frag_back[1] = { GL_BACK };
-	//GLenum frag_target[1] = { GL_COLOR_ATTACHMENT0 }:
-
-	void CheckDebugLog();
-	void DebugOutputToFile(unsigned int source, unsigned int type, unsigned int id, unsigned int severity, const char* message);
-
 	protected:
 		GSTexture* CreateSurface(int type, int w, int h, bool msaa, int format);
 		GSTexture* FetchSurface(int type, int w, int h, bool msaa, int format);
@@ -244,6 +238,11 @@ class GSDeviceOGL : public GSDevice
 		GSDeviceOGL();
 		virtual ~GSDeviceOGL();
 
+		static void DebugCallback(unsigned int source, unsigned int type, unsigned int id, unsigned int severity, int length, const char* message, void* userParam);
+		void CheckDebugLog();
+		static void DebugOutputToFile(unsigned int source, unsigned int type, unsigned int id, unsigned int severity, const char* message);
+
+
 		bool Create(GSWnd* wnd);
 		bool Reset(int w, int h);
 		void Flip();

plugins/GSdx/GSWnd.cpp

@@ -361,8 +361,9 @@ bool GSWnd::Attach(void* handle, bool managed)
 		{
 			GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
 			GLX_CONTEXT_MINOR_VERSION_ARB, 1,
-				// FIXME : Request a debug context to ease opengl development
-				GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
+			// FIXME : Request a debug context to ease opengl development
+			// Note: don't support deprecated feature (pre openg 3.1)
+			GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB | GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
 			0
 		};
 		m_context = glXCreateContextAttribsARB(m_XDisplay, fbc[0], 0, true, context_attribs);

plugins/GSdx/res/convert.glsl

@@ -94,6 +94,20 @@ void ps_main6() // diagonal
     SV_Target0 = c;
 }
 
+// Avoid to log useless error compilation failure
+void ps_main1()
+{
+}
+void ps_main2()
+{
+}
+void ps_main3()
+{
+}
+void ps_main4()
+{
+}
+
 //void ps_main1()
 //{
 //    vec4 c = sample_c(TEXCOORD);