Detecting VMware SVGA3D driver.

The SVGA3D driver is used on Windows as well, which means Mesa is now
detected on Windows too.

src/Magnum/Context.cpp

@@ -904,6 +904,9 @@ Debug& operator<<(Debug& debug, const Context::DetectedDriver value) {
         _c(Mesa)
         _c(NVidia)
         #endif
+        #ifndef MAGNUM_TARGET_WEBGL
+        _c(Svga3D)
+        #endif
         #undef _c
         /* LCOV_EXCL_STOP */
     }
@@ -924,6 +927,9 @@ Debug& operator<<(Debug& debug, const Context::DetectedDrivers value) {
         Context::DetectedDriver::Mesa,
         Context::DetectedDriver::NVidia,
         #endif
+        #ifndef MAGNUM_TARGET_WEBGL
+        Context::DetectedDriver::Svga3D
+        #endif
     });
 }
 #endif

src/Magnum/Context.h

@@ -256,7 +256,8 @@ class MAGNUM_EXPORT Context {
             IntelWindows = 1 << 2,
 
             /**
-             * Mesa drivers on Linux
+             * Mesa drivers on Windows and Linux. See also
+             * @ref DetectedDriver::Svga3D.
              * @requires_gles Not detectable on WebGL, as browsers
              *      intentionally hide most of the driver information.
              */
@@ -267,7 +268,19 @@ class MAGNUM_EXPORT Context {
              * @requires_gles Not detectable on WebGL, as browsers
              *      intentionally hide most of the driver information.
              */
-            NVidia = 1 << 4
+            NVidia = 1 << 4,
+            #endif
+
+            #ifndef MAGNUM_TARGET_WEBGL
+            /**
+             * VMware guest GL driver SVGA3D, implemented using Mesa, both
+             * Windows and Linux guests. See https://www.mesa3d.org/vmware-guest.html
+             * for more information. Detected in combination with
+             * @ref DetectedDriver::Mesa.
+             * @requires_gles Not detectable on WebGL, as browsers
+             *      intentionally hide most of the driver information.
+             */
+            Svga3D = 1 << 5
             #endif
         };
 

src/Magnum/Implementation/driverSpecific.cpp

@@ -130,6 +130,7 @@ auto Context::detectedDriver() -> DetectedDrivers {
 
     _detectedDrivers = DetectedDrivers{};
 
+    const std::string renderer = rendererString();
     const std::string vendor = vendorString();
     const std::string version = versionString();
 
@@ -145,11 +146,15 @@ auto Context::detectedDriver() -> DetectedDrivers {
         return *_detectedDrivers |= DetectedDriver::IntelWindows;
     #endif
 
-    #ifdef CORRADE_TARGET_UNIX
     /* Mesa drivers */
-    if(version.find("Mesa") != std::string::npos)
+    if(version.find("Mesa") != std::string::npos) {
-        return *_detectedDrivers |= DetectedDriver::Mesa;
+        *_detectedDrivers |= DetectedDriver::Mesa;
-    #endif
+
+        if(renderer.find("SVGA3D") != std::string::npos)
+            *_detectedDrivers |= DetectedDriver::Svga3D;
+
+        return *_detectedDrivers;
+    }
 
     if(vendor.find("NVIDIA Corporation") != std::string::npos)
         return *_detectedDrivers |= DetectedDriver::NVidia;