GLES1: Correct 'active' attributes mask.

src/libANGLE/Context.cpp

@@ -9055,7 +9055,7 @@ void StateCache::updateActiveAttribsMask(Context *context)
         return;
     }
 
-    AttributesMask activeAttribs = isGLES1 ? glState.gles1().getVertexArraysAttributeMask()
+    AttributesMask activeAttribs = isGLES1 ? glState.gles1().getActiveAttributesMask()
                                            : glState.getProgram()->getActiveAttribLocationsMask();
 
     const VertexArray *vao = glState.getVertexArray();

src/libANGLE/GLES1State.cpp

@@ -512,6 +512,12 @@ AttributesMask GLES1State::getVertexArraysAttributeMask() const
     return attribsMask;
 }
 
+AttributesMask GLES1State::getActiveAttributesMask() const
+{
+    // The program always has 8 attributes enabled.
+    return AttributesMask(0xFF);
+}
+
 void GLES1State::setHint(GLenum target, GLenum mode)
 {
     setDirty(DIRTY_GLES1_HINT_SETTING);

src/libANGLE/GLES1State.h

@@ -215,6 +215,7 @@ class GLES1State final : angle::NonCopyable
     const PointParameters &pointParameters() const;
 
     AttributesMask getVertexArraysAttributeMask() const;
+    AttributesMask getActiveAttributesMask() const;
 
     void setHint(GLenum target, GLenum mode);
     GLenum getHint(GLenum target);