SH-2244 Add "RenderGLCoreProfile" debug setting that allows the viewer to start with a non-compatibility-profile OpenGL context.

indra/llrender/llgl.cpp

@@ -249,6 +249,10 @@ PFNGLGETUNIFORMFVARBPROC glGetUniformfvARB = NULL;
 PFNGLGETUNIFORMIVARBPROC glGetUniformivARB = NULL;
 PFNGLGETSHADERSOURCEARBPROC glGetShaderSourceARB = NULL;
 
+#if LL_WINDOWS
+PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = NULL;
+#endif
+
 // vertex shader prototypes
 #if LL_LINUX || LL_SOLARIS
 PFNGLVERTEXATTRIB1DARBPROC glVertexAttrib1dARB = NULL;
@@ -409,6 +413,15 @@ void LLGLManager::initWGL()
 		LL_WARNS("RenderInit") << "No ARB pixel format extensions" << LL_ENDL;
 	}
 
+	if (ExtensionExists("WGL_ARB_create_context",gGLHExts.mSysExts))
+	{
+		GLH_EXT_NAME(wglCreateContextAttribsARB) = (PFNWGLCREATECONTEXTATTRIBSARBPROC)GLH_EXT_GET_PROC_ADDRESS("wglCreateContextAttribsARB");
+	}
+	else
+	{
+		LL_WARNS("RenderInit") << "No ARB create context extensions" << LL_ENDL;
+	}
+	
 	if (ExtensionExists("WGL_EXT_swap_control", gGLHExts.mSysExts))
 	{
         GLH_EXT_NAME(wglSwapIntervalEXT) = (PFNWGLSWAPINTERVALEXTPROC)GLH_EXT_GET_PROC_ADDRESS("wglSwapIntervalEXT");

indra/llrender/llglheaders.h

@@ -531,6 +531,8 @@ extern PFNGLSAMPLEMASKIPROC glSampleMaski;
 #include "GL/glext.h"
 #include "GL/glh_extensions.h"
 
+// WGL_ARB_create_context
+extern PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB;
 
 // GL_ARB_vertex_buffer_object
 extern PFNGLBINDBUFFERARBPROC		glBindBufferARB;

indra/llrender/llrender.cpp

@@ -47,6 +47,7 @@ S32	gGLViewport[4];
 U32 LLRender::sUICalls = 0;
 U32 LLRender::sUIVerts = 0;
 U32 LLTexUnit::sWhiteTexture = 0;
+bool LLRender::sGLCoreProfile = false;
 
 static const U32 LL_NUM_TEXTURE_LAYERS = 32; 
 static const U32 LL_NUM_LIGHT_UNITS = 8;

indra/llrender/llrender.h

@@ -428,6 +428,7 @@ public:
 public:
 	static U32 sUICalls;
 	static U32 sUIVerts;
+	static bool sGLCoreProfile;
 	
 private:
 	friend class LLLightState;

indra/llwindow/llwindowwin32.cpp

@@ -1122,6 +1122,34 @@ BOOL LLWindowWin32::switchContext(BOOL fullscreen, const LLCoordScreen &size, BO
 
 	gGLManager.initWGL();
 
+	if (wglCreateContextAttribsARB && LLRender::sGLCoreProfile)
+	{
+		S32 attribs[] = 
+		{
+			WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
+			WGL_CONTEXT_MINOR_VERSION_ARB, 0,
+			WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
+			0
+		};
+
+		HGLRC res = wglCreateContextAttribsARB(mhDC, mhRC, attribs);
+
+		if (!res)
+		{
+			attribs[1] = 3;
+			attribs[3] = 1;
+
+			res = wglCreateContextAttribsARB(mhDC, mhRC, attribs);
+		}
+
+		if (res)
+		{
+			wglMakeCurrent(mhDC, res);
+			wglDeleteContext(mhRC);
+			mhRC = res;
+		}
+	}
+	
 	if (wglChoosePixelFormatARB)
 	{
 		// OK, at this point, use the ARB wglChoosePixelFormatsARB function to see if we

indra/newview/app_settings/settings.xml

@@ -8591,6 +8591,17 @@
       <key>Value</key>
       <real>1.0</real>
     </map>
+    <key>RenderGLCoreProfile</key>
+    <map>
+      <key>Comment</key>
+      <string>Don't use a compatibility profile OpenGL context.  Requires restart.  Basic shaders MUST be enabled.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>0</integer>
+    </map>
     <key>RenderGlow</key>
     <map>
       <key>Comment</key>

indra/newview/llappviewer.cpp

@@ -518,6 +518,8 @@ static void settings_to_globals()
 
 	LLSurface::setTextureSize(gSavedSettings.getU32("RegionTextureSize"));
 	
+	LLRender::sGLCoreProfile = gSavedSettings.getBOOL("RenderGLCoreProfile");
+
 	LLImageGL::sGlobalUseAnisotropic	= gSavedSettings.getBOOL("RenderAnisotropic");
 	LLVOVolume::sLODFactor				= gSavedSettings.getF32("RenderVolumeLODFactor");
 	LLVOVolume::sDistanceFactor			= 1.f-LLVOVolume::sLODFactor * 0.1f;