From afa53e242e33a4593d59bfe12e89262a80e883eb Mon Sep 17 00:00:00 2001
From: kervala <devnull@localhost>
Date: Sat, 26 Dec 2015 17:51:36 +0100
Subject: [PATCH] Changed: Support for GLX_MESA_query_renderer to detect video
 memory

---
 .../src/3d/driver/opengl/driver_opengl.cpp    | 11 +++++++++++
 .../driver/opengl/driver_opengl_extension.cpp | 19 +++++++++++++++++++
 .../driver/opengl/driver_opengl_extension.h   |  7 +++++++
 3 files changed, 37 insertions(+)

diff --git a/code/nel/src/3d/driver/opengl/driver_opengl.cpp b/code/nel/src/3d/driver/opengl/driver_opengl.cpp
index b01f58ba3..fa2894229 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl.cpp
@@ -1293,6 +1293,17 @@ sint CDriverGL::getTotalVideoMemory() const
 	{
 		nlerror("3D: Unable to get current renderer ID (%s)", CGLErrorString(error));
 	}
+#else
+	if (_Extensions.GLXMESAQueryRenderer)
+	{
+		uint32 memoryInMiB = 0;
+
+		if (nglXQueryCurrentRendererIntegerMESA(GLX_RENDERER_VIDEO_MEMORY_MESA, &memoryInMiB))
+		{
+			nlinfo("3D: GLX_RENDERER_VIDEO_MEMORY_MESA returned %u MiB", memoryInMiB);
+			return memoryInMiB * 1024;
+		}
+	}
 #endif
 
 	return -1;
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp b/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp
index 37099eab6..59ca38a57 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp
@@ -541,6 +541,9 @@ PFNGLXSWAPINTERVALSGIPROC					nglXSwapIntervalSGI;
 PFNGLXSWAPINTERVALMESAPROC					nglXSwapIntervalMESA;
 PFNGLXGETSWAPINTERVALMESAPROC				nglXGetSwapIntervalMESA;
 
+// GLX_MESA_query_renderer
+// =======================
+PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC	nglXQueryCurrentRendererIntegerMESA;
 #endif
 
 #endif // USE_OPENGLES
@@ -1888,6 +1891,19 @@ static bool	setupGLXMESASwapControl(const char	*glext)
 	return true;
 }
 
+// *********************************
+static bool	setupGLXMESAQueryRenderer(const char	*glext)
+{
+	H_AUTO_OGL(setupGLXMESAQueryRenderer);
+	CHECK_EXT("GLX_MESA_query_renderer");
+
+#if defined(NL_OS_UNIX) && !defined(NL_OS_MAC)
+	CHECK_ADDRESS(PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC, glXQueryCurrentRendererIntegerMESA);
+#endif
+
+	return true;
+}
+
 #ifdef USE_OPENGLES
 // ***************************************************************************
 bool registerEGlExtensions(CGlExtensions &ext, EGLDisplay dpy)
@@ -2030,6 +2046,9 @@ bool registerGlXExtensions(CGlExtensions &ext, Display *dpy, sint screen)
 	ext.GLXSGISwapControl= setupGLXSGISwapControl(glext);
 	ext.GLXMESASwapControl= setupGLXMESASwapControl(glext);
 
+	// check for renderer information
+	ext.GLXMESAQueryRenderer= setupGLXMESAQueryRenderer(glext);
+
 	return true;
 }
 #endif // USE_OPENGLES
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_extension.h b/code/nel/src/3d/driver/opengl/driver_opengl_extension.h
index d5556ef64..5338ff999 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_extension.h
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_extension.h
@@ -87,6 +87,7 @@ struct	CGlExtensions
 	bool	GLXEXTSwapControl;
 	bool	GLXSGISwapControl;
 	bool	GLXMESASwapControl;
+	bool	GLXMESAQueryRenderer;
 
 	// ATI Extensions.
 	bool	ATIVertexArrayObject;
@@ -164,6 +165,7 @@ public:
 		GLXEXTSwapControl= false;
 		GLXSGISwapControl= false;
 		GLXMESASwapControl= false;
+		GLXMESAQueryRenderer= false;
 		EXTBlendColor= false;
 		ATIVertexArrayObject= false;
 		ATIEnvMapBumpMap = false;
@@ -264,6 +266,7 @@ public:
 		result += GLXEXTSwapControl ? "GLXEXTSwapControl " : "";
 		result += GLXSGISwapControl ? "GLXSGISwapControl " : "";
 		result += GLXMESASwapControl ? "GLXMESASwapControl " : "";
+		result += GLXMESAQueryRenderer ? "GLXMESAQueryRenderer " : "";
 #endif
 
 		result += "\n  Array/VBO: ";
@@ -816,6 +819,10 @@ extern PFNGLXSWAPINTERVALSGIPROC			nglXSwapIntervalSGI;
 extern PFNGLXSWAPINTERVALMESAPROC			nglXSwapIntervalMESA;
 extern PFNGLXGETSWAPINTERVALMESAPROC		nglXGetSwapIntervalMESA;
 
+// GLX_MESA_query_renderer
+// =======================
+extern PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC	nglXQueryCurrentRendererIntegerMESA;
+
 #endif
 
 // GL_EXT_framebuffer_object