From 2ca04fbe7985ee944f3fa6302886a252a51add0c Mon Sep 17 00:00:00 2001
From: Wolfgang Draxinger <Wolfgang.Draxinger@draxit.de>
Date: Sun, 24 Apr 2016 23:52:45 +0200
Subject: initial commit

---
 debuggl/debuggl.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 debuggl/debuggl.h | 29 ++++++++++++++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 debuggl/debuggl.c
 create mode 100644 debuggl/debuggl.h

(limited to 'debuggl')

diff --git a/debuggl/debuggl.c b/debuggl/debuggl.c
new file mode 100644
index 0000000..4775ade
--- /dev/null
+++ b/debuggl/debuggl.c
@@ -0,0 +1,67 @@
+#include "debuggl.h"
+#include <GL/gl.h>
+#include <stdio.h>
+
+int debuggl_check_call(
+	char const * const file,
+	char const * const func,
+	unsigned int const line,
+	char const * const what)
+{
+	int errors = 0;
+        GLenum err;
+	while( (err = glGetError()) != GL_NO_ERROR) {
+		++errors;
+		char const * errstr = NULL;
+		switch( err ) {
+			case GL_INVALID_ENUM:      errstr = "invalid enum"; break;
+			case GL_INVALID_VALUE:     errstr = "invalid value"; break;
+			case GL_INVALID_OPERATION: errstr = "invalid operation"; break;
+			case GL_STACK_OVERFLOW:    errstr = "invalid overflow"; break;
+			case GL_STACK_UNDERFLOW:   errstr = "invalid underflow"; break;
+			case GL_OUT_OF_MEMORY:     errstr = "invalid memory"; break;
+		}
+		fprintf(stderr,
+			"%s(%d)/%s: %s => OpenGL Error: %s\n",
+			file, (int)line, func, what,
+			errstr );
+	}
+	return errors;
+}
+
+int debuggl_trace_call(
+	char const * const file,
+	char const * const func,
+	unsigned int const line,
+	char const * const what)
+{
+	int errors = 0;
+        GLenum err;
+	do {
+		err = glGetError();
+		char const * errstr = NULL;
+		switch( err ) {
+			case GL_INVALID_ENUM:      errstr = "invalid enum"; break;
+			case GL_INVALID_VALUE:     errstr = "invalid value"; break;
+			case GL_INVALID_OPERATION: errstr = "invalid operation"; break;
+			case GL_STACK_OVERFLOW:    errstr = "invalid overflow"; break;
+			case GL_STACK_UNDERFLOW:   errstr = "invalid underflow"; break;
+			case GL_OUT_OF_MEMORY:     errstr = "invalid memory"; break;
+		}
+
+		if( errstr ) {
+			++errors;
+			fprintf(stderr,
+				"%s(%d)/%s: %s => OpenGL Error: %s\n",
+				file, (int)line, func, what,
+				errstr );
+		}
+		else {
+			fprintf(stderr,
+				"%s(%d): %s OK\n",
+				func, (int)line, what);
+		}
+	} while( GL_NO_ERROR != err );
+	return errors;
+}
+
diff --git a/debuggl/debuggl.h b/debuggl/debuggl.h
new file mode 100644
index 0000000..4d8dff9
--- /dev/null
+++ b/debuggl/debuggl.h
@@ -0,0 +1,29 @@
+#pragma once
+#ifndef DEBUGGL_H
+#define DEBUGGL_H
+
+/* execute a OpenGL but check for errors only if compiled for debugging */
+#ifndef NDEBUG
+#define debuggl_trace(glcmd) \
+	({ glcmd; debuggl_trace_call(__FILE__, __func__, __LINE__, #glcmd); })
+#else
+#define debuggl_trace(glcmd) glcmd
+#endif
+
+/* check for OpenGL errors */
+#define debuggl_check(glcmd) \
+	({ glcmd; debuggl_check_call(__FILE__, __func__, __LINE__, #glcmd); })
+
+int debuggl_check_call(
+	char const * const file,
+	char const * const func,
+	unsigned int const line,
+	char const * const what);
+
+int debuggl_trace_call(
+	char const * const file,
+	char const * const func,
+	unsigned int const line,
+	char const * const what);
+
+#endif/*DEBUGGL_H*/
-- 
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