leviathan-2.0

src/debug.h

@@ -0,0 +1,48 @@
+// This header contains some useful functions for debugging OpenGL.
+// Remember to disable them when building your final releases.
+
+#include <windows.h>
+#include <GL/gl.h>
+#include "glext.h"
+
+#define STRINGIFY2(x) #x // Thanks sooda!
+#define STRINGIFY(x) STRINGIFY2(x)
+#define CHECK_ERRORS() assertGlError(STRINGIFY(__LINE__))
+
+static GLchar* getErrorString(GLenum errorCode)
+{
+	if (errorCode == GL_NO_ERROR) {
+		return (GLchar*) "No error";
+	}
+	else if (errorCode == GL_INVALID_VALUE) {
+		return (GLchar*) "Invalid value";
+	}
+	else if (errorCode == GL_INVALID_ENUM) {
+		return (GLchar*) "Invalid enum";
+	}
+	else if (errorCode == GL_INVALID_OPERATION) {
+		return (GLchar*) "Invalid operation";
+	}
+	else if (errorCode == GL_STACK_OVERFLOW) {
+		return (GLchar*) "Stack overflow";
+	}
+	else if (errorCode == GL_STACK_UNDERFLOW) {
+		return (GLchar*) "Stack underflow";
+	}
+	else if (errorCode == GL_OUT_OF_MEMORY) {
+		return (GLchar*) "Out of memory";
+	}
+	return (GLchar*) "Unknown";
+}
+
+static void assertGlError(const char* error_message)
+{
+	const GLenum ErrorValue = glGetError();
+	if (ErrorValue == GL_NO_ERROR) return;
+
+	const char* APPEND_DETAIL_STRING = ": %s\n";
+	const size_t APPEND_LENGTH = strlen(APPEND_DETAIL_STRING) + 1;
+	const size_t message_length = strlen(error_message);
+	MessageBox(NULL, error_message, getErrorString(ErrorValue), 0x00000000L);
+	ExitProcess(0);
+}