Experimenting with GL debug context and GL_ARB_debug_output

BBGE/GLLoad.cpp

@@ -23,9 +23,56 @@ bool void unload_all_glsyms() { return false; }
 #define GLAPIENTRY
 #endif
 
-#include <GL/glext.h>
+static const char *glDebugTypeToStr(unsigned e)
+{
+	switch(e)
+	{
+		case GL_DEBUG_TYPE_ERROR_ARB: return " ERR";
+		case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB: return "depr";
+		case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB: return " UB!";
+		case GL_DEBUG_TYPE_PORTABILITY_ARB: return "port";
+		case GL_DEBUG_TYPE_PERFORMANCE_ARB: return "perf";
+		case GL_DEBUG_TYPE_OTHER_ARB: return "othr";
+	}
+	return "unknown";
+}
+static const char *glDebugSeverityToStr(unsigned e)
+{
+	switch(e)
+	{
+		case GL_DEBUG_SEVERITY_HIGH_ARB: return "###";
+		case GL_DEBUG_SEVERITY_MEDIUM_ARB: return "+++";
+		case GL_DEBUG_SEVERITY_LOW_ARB: return "---";
+		//case GL_DEBUG_SEVERITY_NOTIFICATION: return "   ";
+	}
+	return "";
+}
 
 
+static void GLAPIENTRY debugCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *userParam)
+{
+	switch(severity)
+	{
+		case GL_DEBUG_SEVERITY_HIGH_ARB:
+		case GL_DEBUG_SEVERITY_MEDIUM_ARB:
+		case GL_DEBUG_SEVERITY_LOW_ARB:
+		{
+			const char *ty = glDebugTypeToStr(type);
+			const char *sev = glDebugSeverityToStr(severity);
+
+			std::ostringstream os;
+			os << sev << " GL[" << ty << "]: " << message;
+			debugLog(os.str());
+		}
+		break;
+
+		/*case GL_DEBUG_SEVERITY_NOTIFICATION:
+			break;
+		default:
+			assert(false);*/
+	}
+}
+
 PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT = NULL;
 
 // GL_ARB_shader_objects
@@ -183,6 +230,25 @@ bool lookup_all_glsyms()
 	glMapBufferARB            = (PFNGLMAPBUFFERARBPROC)SDL_GL_GetProcAddress("glMapBufferARB");
 	glUnmapBufferARB          = (PFNGLUNMAPBUFFERARBPROC)SDL_GL_GetProcAddress("glUnmapBufferARB");
 
+
+#if _DEBUG
+	//PFNGLDEBUGMESSAGECONTROLARBPROC glDebugMessageControlARB = (PFNGLDEBUGMESSAGECONTROLARBPROC)SDL_GL_GetProcAddress("glDebugMessageControlARB");
+	PFNGLDEBUGMESSAGECALLBACKARBPROC glDebugMessageCallbackARB = (PFNGLDEBUGMESSAGECALLBACKARBPROC)SDL_GL_GetProcAddress("glDebugMessageCallbackARB");
+	//PFNGLDEBUGMESSAGEINSERTARBPROC glDebugMessageInsertARB = (PFNGLDEBUGMESSAGEINSERTARBPROC)SDL_GL_GetProcAddress("glDebugMessageInsertARB");
+	if(glDebugMessageCallbackARB)
+	{
+		/*glDebugMessageCallbackARB(debugCallback, NULL);
+		glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB);*/
+	}
+
+	//if(glDebugMessageControlARB)
+	//	glDebugMessageControlARB(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, NULL, 0, GL_TRUE);
+
+	//if(glDebugMessageInsertARB)
+	//	glDebugMessageInsertARB(GL_DEBUG_SOURCE_APPLICATION_ARB, GL_DEBUG_TYPE_OTHER_ARB, 0, GL_DEBUG_SEVERITY_HIGH_ARB, 0, "GL debug test");
+
+#endif
+
 	return retval;
 }
 

BBGE/RenderBase.h

@@ -12,6 +12,44 @@
 #include <GL/gl.h>
 #include <GL/glext.h>
 
+// Extensions from newer glext.h versions
+#ifndef GL_ARB_debug_output
+#define GL_ARB_debug_output 1
+typedef void (APIENTRY  *GLDEBUGPROCARB)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam);
+#define GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB   0x8242
+#define GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH_ARB 0x8243
+#define GL_DEBUG_CALLBACK_FUNCTION_ARB    0x8244
+#define GL_DEBUG_CALLBACK_USER_PARAM_ARB  0x8245
+#define GL_DEBUG_SOURCE_API_ARB           0x8246
+#define GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB 0x8247
+#define GL_DEBUG_SOURCE_SHADER_COMPILER_ARB 0x8248
+#define GL_DEBUG_SOURCE_THIRD_PARTY_ARB   0x8249
+#define GL_DEBUG_SOURCE_APPLICATION_ARB   0x824A
+#define GL_DEBUG_SOURCE_OTHER_ARB         0x824B
+#define GL_DEBUG_TYPE_ERROR_ARB           0x824C
+#define GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB 0x824D
+#define GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB 0x824E
+#define GL_DEBUG_TYPE_PORTABILITY_ARB     0x824F
+#define GL_DEBUG_TYPE_PERFORMANCE_ARB     0x8250
+#define GL_DEBUG_TYPE_OTHER_ARB           0x8251
+#define GL_MAX_DEBUG_MESSAGE_LENGTH_ARB   0x9143
+#define GL_MAX_DEBUG_LOGGED_MESSAGES_ARB  0x9144
+#define GL_DEBUG_LOGGED_MESSAGES_ARB      0x9145
+#define GL_DEBUG_SEVERITY_HIGH_ARB        0x9146
+#define GL_DEBUG_SEVERITY_MEDIUM_ARB      0x9147
+#define GL_DEBUG_SEVERITY_LOW_ARB         0x9148
+typedef void (APIENTRYP PFNGLDEBUGMESSAGECONTROLARBPROC) (GLenum source, GLenum type, GLenum severity, GLsizei count, const GLuint *ids, GLboolean enabled);
+typedef void (APIENTRYP PFNGLDEBUGMESSAGEINSERTARBPROC) (GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *buf);
+typedef void (APIENTRYP PFNGLDEBUGMESSAGECALLBACKARBPROC) (GLDEBUGPROCARB callback, const void *userParam);
+typedef GLuint (APIENTRYP PFNGLGETDEBUGMESSAGELOGARBPROC) (GLuint count, GLsizei bufSize, GLenum *sources, GLenum *types, GLuint *ids, GLenum *severities, GLsizei *lengths, GLchar *messageLog);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glDebugMessageControlARB (GLenum source, GLenum type, GLenum severity, GLsizei count, const GLuint *ids, GLboolean enabled);
+GLAPI void APIENTRY glDebugMessageInsertARB (GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *buf);
+GLAPI void APIENTRY glDebugMessageCallbackARB (GLDEBUGPROCARB callback, const void *userParam);
+GLAPI GLuint APIENTRY glGetDebugMessageLogARB (GLuint count, GLsizei bufSize, GLenum *sources, GLenum *types, GLuint *ids, GLenum *severities, GLsizei *lengths, GLchar *messageLog);
+#endif
+#endif /* GL_ARB_debug_output */
+
 #ifdef _WINDOWS_
 #error windows.h was included! euuugh!
 #endif

BBGE/Window_SDL2.cpp

@@ -93,6 +93,10 @@ void Window::_open(unsigned w, unsigned h, bool full, unsigned bpp, bool vsync,
 		}
 	}
 
+#ifdef _DEBUG
+	//SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);
+#endif
+
 	int pos = SDL_WINDOWPOS_CENTERED_DISPLAY(display);
 	WIN = SDL_CreateWindow("", pos, pos, usew, useh, flags);
 	if(!WIN)