Only use opengl debug groups if the LOVE_GRAPHICS_DEBUG environment variable is set to 1.

--HG--
branch : minor

src/modules/graphics/Graphics.cpp

@@ -28,6 +28,7 @@
 
 // C++
 #include <algorithm>
+#include <stdlib.h>
 
 namespace love
 {
@@ -35,6 +36,8 @@ namespace graphics
 {
 
 static bool gammaCorrect = false;
+static bool debugMode = false;
+static bool debugModeQueried = false;
 
 void setGammaCorrect(bool gammacorrect)
 {
@@ -80,6 +83,18 @@ Colorf unGammaCorrectColor(const Colorf &c)
 	return r;
 }
 
+bool isDebugEnabled()
+{
+	if (!debugModeQueried)
+	{
+		const char *debugenv = getenv("LOVE_GRAPHICS_DEBUG");
+		debugMode = debugenv != nullptr && debugenv[0] != '0';
+		debugModeQueried = true;
+	}
+
+	return debugMode;
+}
+
 love::Type Graphics::type("graphics", &Module::type);
 
 Shader::ShaderSource Graphics::defaultShaderCode[Shader::LANGUAGE_MAX_ENUM][2];

src/modules/graphics/Graphics.h

@@ -88,6 +88,8 @@ void unGammaCorrectColor(Colorf &c);
 Colorf gammaCorrectColor(const Colorf &c);
 Colorf unGammaCorrectColor(const Colorf &c);
 
+bool isDebugEnabled();
+
 class Graphics : public Module
 {
 public:

src/modules/graphics/opengl/Graphics.cpp

@@ -272,17 +272,7 @@ bool Graphics::setMode(int width, int height, int pixelwidth, int pixelheight, b
 	else
 		setGammaCorrect(false);
 
-	bool enabledebug = false;
-
-	if (GLAD_VERSION_3_0)
-	{
-		// Enable OpenGL's debug output if a debug context has been created.
-		GLint flags = 0;
-		glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
-		enabledebug = (flags & GL_CONTEXT_FLAG_DEBUG_BIT) != 0;
-	}
-
-	setDebug(enabledebug);
+	setDebug(isDebugEnabled());
 
 	if (streamBufferState.vb[0] == nullptr)
 	{

src/modules/graphics/opengl/OpenGL.cpp

@@ -64,6 +64,32 @@ static void *LOVEGetProcAddress(const char *name)
 	return SDL_GL_GetProcAddress(name);
 }
 
+OpenGL::TempDebugGroup::TempDebugGroup(const char *name)
+{
+	if (isDebugEnabled())
+	{
+		if (GLAD_VERSION_4_3 || (GLAD_KHR_debug && !GLAD_ES_VERSION_2_0))
+			glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, 0, (const GLchar *) name);
+		else if (GLAD_ES_VERSION_2_0 && GLAD_KHR_debug)
+			glPushDebugGroupKHR(GL_DEBUG_SOURCE_APPLICATION, 0, 0, (const GLchar *) name);
+		else if (GLAD_EXT_debug_marker)
+			glPushGroupMarkerEXT(0, (const GLchar *) name);
+	}
+}
+
+OpenGL::TempDebugGroup::~TempDebugGroup()
+{
+	if (isDebugEnabled())
+	{
+		if (GLAD_VERSION_4_3 || (GLAD_KHR_debug && !GLAD_ES_VERSION_2_0))
+			glPopDebugGroup();
+		else if (GLAD_ES_VERSION_2_0 && GLAD_KHR_debug)
+			glPopDebugGroupKHR();
+		else if (GLAD_EXT_debug_marker)
+			glPopGroupMarkerEXT();
+	}
+}
+
 OpenGL::OpenGL()
 	: stats()
 	, contextInitialized(false)

src/modules/graphics/opengl/OpenGL.h

@@ -101,25 +101,8 @@ public:
 	{
 	public:
 
-		TempDebugGroup(const char *name)
-		{
-			if (GLAD_VERSION_4_3 || (GLAD_KHR_debug && !GLAD_ES_VERSION_2_0))
-				glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, 0, (const GLchar *) name);
-			else if (GLAD_ES_VERSION_2_0 && GLAD_KHR_debug)
-				glPushDebugGroupKHR(GL_DEBUG_SOURCE_APPLICATION, 0, 0, (const GLchar *) name);
-			else if (GLAD_EXT_debug_marker)
-				glPushGroupMarkerEXT(0, (const GLchar *) name);
-		}
-
-		~TempDebugGroup()
-		{
-			if (GLAD_VERSION_4_3 || (GLAD_KHR_debug && !GLAD_ES_VERSION_2_0))
-				glPopDebugGroup();
-			else if (GLAD_ES_VERSION_2_0 && GLAD_KHR_debug)
-				glPopDebugGroupKHR();
-			else if (GLAD_EXT_debug_marker)
-				glPopGroupMarkerEXT();
-		}
+		TempDebugGroup(const char *name);
+		~TempDebugGroup();
 	};
 
 	struct Stats