Recognize some more driver-specific workarounds.

src/Magnum/Implementation/driverSpecific.cpp

@@ -34,10 +34,35 @@ namespace Magnum {
 
 namespace {
     std::vector<std::string> KnownWorkarounds{
+        #ifndef MAGNUM_TARGET_GLES
         /* Creating core context with specific version on AMD and NV
            proprietary drivers causes the context to be forced to given
            version instead of selecting latest available version */
-        "amd-nv-no-forward-compatible-core-context"
+        "amd-nv-no-forward-compatible-core-context",
+
+        /* Using ARB_explicit_uniform_location on AMD linux drivers 13.251
+           caused the GLSL compiler to crash */
+        "amd-explicit-uniform-location-crash",
+
+        #ifdef CORRADE_TARGET_WINDOWS
+        /* On Windows Intel drivers ARB_shading_language_420pack is exposed in
+           GLSL even though the extension (e.g. binding keyword) is not
+           supported */
+        "intel-windows-glsl-exposes-unsupported-shading-language-420pack",
+        #endif
+
+        /* Layout qualifier causes compiler error with GLSL 1.20 on Mesa, GLSL
+           1.30 on NVidia and 1.40 on Mac OS X. Everything is fine when using
+           newer GLSL version. */
+        "no-layout-qualifiers-on-old-glsl",
+        #endif
+
+        #ifdef CORRADE_TARGET_NACL
+        /* NaCl advertises some additional extensions but the GLESv2 library
+           does not have any entrypoints for them and there is no GetProcAddress
+           equivalent, thus marking them as unsupported. */
+        "nacl-missing-extension-entrypoints"
+        #endif
     };
 }
 
@@ -132,27 +157,23 @@ void Context::setupDriverWorkarounds() {
             _extensionRequiredVersion[Extensions::extension::Index] = Version::version
 
     #ifndef MAGNUM_TARGET_GLES
-    /* This extension causes crash in GLSL compiler on AMD linux drivers 13.251 */
+    if((detectedDriver() & DetectedDriver::AMD) && !isDriverWorkaroundDisabled("amd-explicit-uniform-location-crash"))
-    if(detectedDriver() & DetectedDriver::AMD)
         _setRequiredVersion(GL::ARB::explicit_uniform_location, None);
 
     #ifdef CORRADE_TARGET_WINDOWS
-    /* On Windows Intel drivers ARB_shading_language_420pack is exposed in GLSL
+    if((detectedDriver() & DetectedDriver::IntelWindows) && !isExtensionSupported<Extensions::GL::ARB::shading_language_420pack>() && !isDriverWorkaroundDisabled("intel-windows-glsl-exposes-unsupported-shading-language-420pack"))
-       even that the extension (e.g. binding keyword) is not supported */
-    if((detectedDriver() & DetectedDriver::IntelWindows) && !isExtensionSupported<Extensions::GL::ARB::shading_language_420pack>())
         _setRequiredVersion(GL::ARB::shading_language_420pack, None);
     #endif
 
-    /* Layout qualifier causes compiler error with GLSL 1.20 on Mesa, GLSL 1.30
+    if(!isDriverWorkaroundDisabled("no-layout-qualifiers-on-old-glsl")) {
-       on NVidia and 1.40 on Mac OS X */
-    /** @todo Different version on different vendors? */
         _setRequiredVersion(GL::ARB::explicit_attrib_location, GL320);
         _setRequiredVersion(GL::ARB::explicit_uniform_location, GL320);
         _setRequiredVersion(GL::ARB::shading_language_420pack, GL320);
+    }
     #endif
 
-    /* Disable extensions not available on NaCl */
     #ifdef CORRADE_TARGET_NACL
+    if(!isDriverWorkaroundDisabled("nacl-missing-extension-entrypoints")) {
         _setRequiredVersion(GL::EXT::multi_draw_arrays, None);
         _setRequiredVersion(GL::EXT::debug_label, None);
         _setRequiredVersion(GL::EXT::debug_marker, None);
@@ -182,6 +203,7 @@ void Context::setupDriverWorkarounds() {
         _setRequiredVersion(GL::NV::instanced_arrays, None);
         _setRequiredVersion(GL::OES::texture_3D, None);
         _setRequiredVersion(GL::OES::vertex_array_object, None);
+    }
     #endif
 
     #undef _setRequiredVersion