Make ANGLE_texture_usage enableable.

src/libANGLE/Caps.cpp

@@ -657,7 +657,7 @@ const ExtensionInfoMap &GetExtensionInfoMap()
         map["GL_EXT_shader_texture_lod"] = enableableExtension(&Extensions::shaderTextureLOD);
         map["GL_EXT_frag_depth"] = enableableExtension(&Extensions::fragDepth);
         map["GL_ANGLE_multiview"] = enableableExtension(&Extensions::multiview);
-        map["GL_ANGLE_texture_usage"] = esOnlyExtension(&Extensions::textureUsage);
+        map["GL_ANGLE_texture_usage"] = enableableExtension(&Extensions::textureUsage);
         map["GL_ANGLE_translated_shader_source"] = esOnlyExtension(&Extensions::translatedShaderSource);
         map["GL_OES_fbo_render_mipmap"] = enableableExtension(&Extensions::fboRenderMipmap);
         map["GL_EXT_discard_framebuffer"] = esOnlyExtension(&Extensions::discardFramebuffer);

src/libANGLE/renderer/null/ContextNULL.cpp

@@ -73,6 +73,7 @@ ContextNULL::ContextNULL(const gl::ContextState &state, AllocationTrackerNULL *a
     mExtensions.copyTexture           = true;
     mExtensions.copyCompressedTexture = true;
     mExtensions.textureRectangle      = true;
+    mExtensions.textureUsage          = true;
 
     mExtensions.rgb8rgba8 = true;
 

src/libANGLE/validationES.cpp

@@ -5403,6 +5403,12 @@ bool ValidateTexParameterBase(Context *context,
             break;
 
         case GL_TEXTURE_USAGE_ANGLE:
+            if (!context->getExtensions().textureUsage)
+            {
+                ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
+                return false;
+            }
+
             switch (ConvertToGLenum(params[0]))
             {
                 case GL_NONE: