Implement more extensions to get graphics card memory for OpenGL on windows and Linux.

(cherry picked from commit da942cdb79a87b76e629b36415c83067e3620a70)

Engine/source/gfx/gl/gfxGLDevice.cpp

@@ -51,6 +51,10 @@
 #include "shaderGen/shaderGen.h"
 #include "gfxGLUtils.h"
 
+#if defined(TORQUE_OS_WIN)
+#include "gfx/gl/tGL/tWGL.h"
+#endif
+
 GFXAdapter::CreateDeviceInstanceDelegate GFXGLDevice::mCreateDeviceInstance(GFXGLDevice::createInstance); 
 
 GFXDevice *GFXGLDevice::createInstance( U32 adapterIndex )
@@ -1073,8 +1077,36 @@ U32 GFXGLDevice::getTotalVideoMemory_GL_EXT()
       return mem / 1024;
    }
 
-   // TODO OPENGL, add supprt for INTEL cards.
-   
+
+#if defined(TORQUE_OS_WIN)
+   else if( (gglHasWExtension(AMD_gpu_association)) )
+   {
+      // Just assume 1 AMD gpu. Who uses crossfire anyways now? And, crossfire doesn't double
+      // vram anyways, so does it really matter?
+      UINT id;
+      if (wglGetGPUIDsAMD(1, &id) != 0)
+      {
+         S32 memorySize;
+         if (wglGetGPUInfoAMD(id, WGL_GPU_RAM_AMD, GL_INT, 1, &memorySize) != -1)
+         {
+            // memory size is returned in MB
+            return memorySize;
+         }
+      }
+   }
+#endif
+
+#if defined(TORQUE_OS_LINUX)
+   else if ( (gglHasXExtension(MESA_query_renderer)) )
+   {
+      // memory size is in mb
+      S32 memorySize;
+      glXQueryCurrentRendererIntegerMESA(GLX_RENDERER_VIDEO_MEMORY_MESA, &memorySize);
+      return memorySize;
+   }
+#endif
+
+   // No other way, sad. Probably windows Intel.
    return 0;
 }
 

Engine/source/gfx/gl/tGL/tGL.cpp

@@ -25,8 +25,10 @@
 #include "core/strings/stringFunctions.h"
 #include "console/console.h"
 
-#ifdef TORQUE_OS_WIN
-   #include "tWGL.h"
+#if defined(TORQUE_OS_WIN)
+#include "tWGL.h"
+#elif defined(TORQUE_OS_LINUX)
+#include "tXGL.h"
 #endif
 
 namespace GL
@@ -41,7 +43,17 @@ namespace GL
 
    void gglPerformExtensionBinds(void *context)
    {
-	
+#if defined(TORQUE_OS_WIN)
+      if (!gladLoadWGL((HDC)context))
+      {
+         AssertFatal(false, "Unable to load WGL in GLAD. Make sure your OpenGL drivers are up to date!");
+      }
+#elif defined(TORQUE_OS_LINUX)
+      if (!gladLoadGLX())
+      {
+         AssertFatal(false, "Unable to load GLX in GLAD. Make sure your OpenGL drivers are up to date!");
+      }
+#endif
    }
 }