wined3d: Store the number of aux buffers in the gl limits structure.

dlls/wined3d/device.c

@@ -1730,10 +1730,7 @@ static HRESULT WINAPI IWineD3DDeviceImpl_Init3D(IWineD3DDevice *iface, WINED3DPR
 
         case ORM_BACKBUFFER:
         {
-            GLint auxBuffers;
-            glGetIntegerv(GL_AUX_BUFFERS, &auxBuffers);
-            TRACE("Got %d aux buffers\n", auxBuffers);
-            if(auxBuffers > 0) {
+            if(GL_LIMITS(aux_buffers) > 0) {
                 TRACE("Using auxilliary buffer for offscreen rendering\n");
                 This->offscreenBuffer = GL_AUX0;
             } else {

dlls/wined3d/directx.c

@@ -546,6 +546,10 @@ BOOL IWineD3DImpl_FillGLCaps(IWineD3D *iface, Display* display) {
     gl_info->max_pointsize = gl_floatv[1];
     TRACE_(d3d_caps)("Maximum point size support - max point size=%f\n", gl_floatv[1]);
 
+    glGetIntegerv(GL_AUX_BUFFERS, &gl_max);
+    gl_info->max_aux_buffers = gl_max;
+    TRACE_(d3d_caps)("Offscreen rendering support - number of aux buffers=%d\n", gl_max);
+
     /* Parse the gl supported features, in theory enabling parts of our code appropriately */
     GL_Extensions = (const char *) glGetString(GL_EXTENSIONS);
     TRACE_(d3d_caps)("GL_Extensions reported:\n");

include/wine/wined3d_gl.h

@@ -1875,6 +1875,7 @@ typedef struct _WineD3D_GL_Info {
   float  max_pointsize;
   UINT   max_blends;
   UINT   max_anisotropy;
+  UINT   max_aux_buffers;
 
   unsigned max_vshader_constantsF;
   unsigned max_pshader_constantsF;