GL: add detection for Qualcomm Adreno drivers.

They are on Android but also apparently Windows, so making them
available on all GLES platforms.

doc/changelog.dox

@@ -519,6 +519,7 @@ See also:
 -   The @ref GL::Context class got significantly optimized in terms of compile
     time, header size and runtime as well, significantly reducing the amount of
     allocations done at startup.
+-   Added @ref GL::Context::DetectedDriver::QualcommAdreno
 -   To make working with cube map images easier,
     @ref GL::CubeMapTexture::setSubImage() and
     @ref GL::CubeMapTexture::subImage() taking 3D images are now exposed on all

src/Magnum/GL/Context.cpp

@@ -1348,6 +1348,9 @@ Debug& operator<<(Debug& debug, const Context::DetectedDriver value) {
         #ifdef CORRADE_TARGET_ANDROID
         _c(ArmMali)
         #endif
+        #if defined(MAGNUM_TARGET_GLES) && !defined(CORRADE_TARGET_APPLE)
+        _c(QualcommAdreno)
+        #endif
         #undef _c
         /* LCOV_EXCL_STOP */
     }
@@ -1371,6 +1374,9 @@ Debug& operator<<(Debug& debug, const Context::DetectedDrivers value) {
         #ifdef CORRADE_TARGET_ANDROID
         Context::DetectedDriver::ArmMali,
         #endif
+        #if defined(MAGNUM_TARGET_GLES) && !defined(CORRADE_TARGET_APPLE)
+        Context::DetectedDriver::QualcommAdreno
+        #endif
     });
 }
 #endif

src/Magnum/GL/Context.h

@@ -489,7 +489,18 @@ class MAGNUM_GL_EXPORT Context {
              *      @ref CORRADE_TARGET_ANDROID "Android".
              * @m_since{2019,10}
              */
-            ArmMali = 1 << 7
+            ArmMali = 1 << 7,
+            #endif
+
+            #if (defined(MAGNUM_TARGET_GLES) && !defined(CORRADE_TARGET_APPLE)) || defined(DOXYGEN_GENERATING_OUTPUT)
+            /**
+             * Qualcomm Adreno drivers for OpenGL ES.
+             * @partialsupport Not available on
+             *      @ref CORRADE_TARGET_APPLE"Apple" platforms.
+             * @m_since_latest
+             */
+            /* Assuming these exist also on non-Android platforms (Windows?) */
+            QualcommAdreno = 1 << 8
             #endif
         };
 

src/Magnum/GL/Implementation/driverSpecific.cpp

@@ -581,6 +581,11 @@ auto Context::detectedDriver() -> DetectedDrivers {
         *_detectedDrivers |= DetectedDriver::ArmMali;
     #endif
 
+    #if defined(MAGNUM_TARGET_GLES) && !defined(CORRADE_TARGET_APPLE)
+    if(vendor.contains("Qualcomm"_s) && renderer.contains("Adreno"_s))
+        *_detectedDrivers |= DetectedDriver::QualcommAdreno;
+    #endif
+
     return *_detectedDrivers;
 }