Bug 227586 – ANGLE Metal Buffers created out of IOSurfaces should take the EGL_IOSURFACE_USAGE_HINT_ANGLE into account

• Status: NEW
• Component: ANGLE

[Kimmo Kinnunen]

ANGLE Metal Buffers created out of IOSurfaces should take the EGL_IOSURFACE_USAGE_HINT_ANGLE into account

The attribute EGL_IOSURFACE_USAGE_HINT_ANGLE may optionally be specified as
    a combination of the bits EGL_IOSURFACE_READ_HINT_ANGLE and
    EGL_IOSURFACE_WRITE_HINT_ANGLE. On the iOS Simulator platform, where
    IOSurface support is incomplete, these hints indicate whether the intent is
    to read from the IOSurface, write to it, or both. Explicitly passing 0 for
    this attribute is equivalent to setting both the read and write usage
    bits. This attribute is ignored on other platforms."

angle::Result IOSurfaceSurfaceMtl::ensureColorTextureCreated(const gl::Context *context)
{
    if (mColorTexture)
    {
        return angle::Result::Continue;
    }
    ContextMtl *contextMtl = mtl::GetImpl(context);
    ANGLE_MTL_OBJC_SCOPE
    {
        auto texDesc =
            [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:mColorFormat.metalFormat
                                                               width:mSize.width
                                                              height:mSize.height
                                                           mipmapped:NO];

        texDesc.usage = MTLTextureUsageShaderRead | MTLTextureUsageRenderTarget;

[Radar WebKit Bug Importer]

<rdar://problem/80324846>