Add ability to disable all ANGLE features

extensions/EGL_ANGLE_feature_control.txt

@@ -85,15 +85,22 @@ New Tokens
 
         EGL_FEATURE_OVERRIDES_ENABLED_ANGLE   0x3466
         EGL_FEATURE_OVERRIDES_DISABLED_ANGLE  0x3467
+        EGL_FEATURE_ALL_DISABLED_ANGLE  0x3469
 
 New Behavior
 
+        EGLDisplay eglGetPlatformDisplay(EGLenum platform, void
+            *native_display, const EGLAttrib *attrib_list);
+
     The attribute following EGL_FEATURE_OVERRIDES_ENABLED_ANGLE or
     EGL_FEATURE_OVERRIDES_DISABLED_ANGLE should be of type char**,
     which should contain a null-terminated array of C strings naming
     the features to be enabled or disabled upon display creation.
     Any features unspecified in one of these arrays will be
     initialized with an internal heuristic.
+    The attribute following EGL_FEATURE_ALL_DISABLED_ANGLE should be
+    either EGL_TRUE to disable all features that are not overridden,
+    or EGL_FALSE to let ANGLE determine which features to enable.
 
 Add the following to the end of section 3.3 "EGL Queries":
 

include/EGL/eglext_angle.h

@@ -235,6 +235,7 @@ EGLAPI EGLBoolean EGLAPIENTRY eglGetSyncValuesCHROMIUM(EGLDisplay dpy,
 #define EGL_FEATURE_OVERRIDES_ENABLED_ANGLE 0x3466
 #define EGL_FEATURE_OVERRIDES_DISABLED_ANGLE 0x3467
 #define EGL_FEATURE_CONDITION_ANGLE 0x3468
+#define EGL_FEATURE_ALL_DISABLED_ANGLE 0x3469
 typedef const char *(EGLAPIENTRYP PFNEGLQUERYSTRINGIANGLEPROC) (EGLDisplay dpy, EGLint name, EGLint index);
 typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYDISPLAYATTRIBANGLEPROC) (EGLDisplay dpy, EGLint attribute, EGLAttrib *value);
 #ifdef EGL_EGLEXT_PROTOTYPES

src/libANGLE/Display.cpp

@@ -365,7 +365,7 @@ void ANGLESetDefaultDisplayPlatform(angle::EGLDisplayType display)
 
 }  // anonymous namespace
 
-DisplayState::DisplayState() : label(nullptr) {}
+DisplayState::DisplayState() : label(nullptr), featuresAllDisabled(false) {}
 
 DisplayState::~DisplayState() {}
 
@@ -565,6 +565,8 @@ void Display::setAttributes(rx::DisplayImpl *impl, const AttributeMap &attribMap
         reinterpret_cast<const char **>(mAttributeMap.get(EGL_FEATURE_OVERRIDES_DISABLED_ANGLE, 0));
     mState.featureOverridesEnabled  = EGLStringArrayToStringVector(featuresForceEnabled);
     mState.featureOverridesDisabled = EGLStringArrayToStringVector(featuresForceDisabled);
+    mState.featuresAllDisabled =
+        static_cast<bool>(mAttributeMap.get(EGL_FEATURE_ALL_DISABLED_ANGLE, 0));
 }
 
 Error Display::initialize()
@@ -610,7 +612,10 @@ Error Display::initialize()
         config.second.renderableType |= EGL_OPENGL_ES_BIT;
     }
 
-    initializeFrontendFeatures();
+    if (!mState.featuresAllDisabled)
+    {
+        initializeFrontendFeatures();
+    }
 
     mFeatures.clear();
     mFrontendFeatures.populateFeatureList(&mFeatures);

src/libANGLE/Display.h

@@ -57,6 +57,7 @@ struct DisplayState final : private angle::NonCopyable
     SurfaceSet surfaceSet;
     std::vector<std::string> featureOverridesEnabled;
     std::vector<std::string> featureOverridesDisabled;
+    bool featuresAllDisabled;
 };
 
 // Constant coded here as a sanity limit.

src/libANGLE/renderer/d3d/d3d11/Renderer11.cpp

@@ -3840,7 +3840,10 @@ void Renderer11::generateCaps(gl::Caps *outCaps,
 
 void Renderer11::initializeFeatures(angle::FeaturesD3D *features) const
 {
-    d3d11::InitializeFeatures(mRenderer11DeviceCaps, mAdapterDescription, features);
+    if (!mDisplay->getState().featuresAllDisabled)
+    {
+        d3d11::InitializeFeatures(mRenderer11DeviceCaps, mAdapterDescription, features);
+    }
     OverrideFeaturesWithDisplayState(features, mDisplay->getState());
 }
 

src/libANGLE/renderer/d3d/d3d9/Renderer9.cpp

@@ -3009,7 +3009,10 @@ void Renderer9::generateCaps(gl::Caps *outCaps,
 
 void Renderer9::initializeFeatures(angle::FeaturesD3D *features) const
 {
-    d3d9::InitializeFeatures(features);
+    if (!mDisplay->getState().featuresAllDisabled)
+    {
+        d3d9::InitializeFeatures(features);
+    }
     OverrideFeaturesWithDisplayState(features, mDisplay->getState());
 }
 

src/libANGLE/renderer/gl/RendererGL.cpp

@@ -219,7 +219,10 @@ RendererGL::RendererGL(std::unique_ptr<FunctionsGL> functions,
       mNativeParallelCompileEnabled(false)
 {
     ASSERT(mFunctions);
-    nativegl_gl::InitializeFeatures(mFunctions.get(), &mFeatures);
+    if (!display->getState().featuresAllDisabled)
+    {
+        nativegl_gl::InitializeFeatures(mFunctions.get(), &mFeatures);
+    }
     OverrideFeaturesWithDisplayState(&mFeatures, display->getState());
     mStateManager =
         new StateManagerGL(mFunctions.get(), getNativeCaps(), getNativeExtensions(), mFeatures);

src/libANGLE/renderer/metal/DisplayMtl.mm

@@ -68,7 +68,11 @@ angle::Result DisplayMtl::initializeImpl(egl::Display *display)
         mCapsInitialized = false;
 
         GlslangInitialize();
-        initializeFeatures();
+
+        if (!mState.featuresAllDisabled)
+        {
+            initializeFeatures();
+        }
 
         ANGLE_TRY(mFormatTable.initialize(this));
 

src/libANGLE/renderer/vulkan/RendererVk.cpp

@@ -1006,7 +1006,10 @@ angle::Result RendererVk::initializeDevice(DisplayVk *displayVk, uint32_t queueF
                            &mProvokingVertexFeatures);
     }
 
-    initFeatures(deviceExtensionNames);
+    if (!displayVk->getState().featuresAllDisabled)
+    {
+        initFeatures(deviceExtensionNames);
+    }
     OverrideFeaturesWithDisplayState(&mFeatures, displayVk->getState());
     mFeaturesInitialized = true;