Revert "[Impeller] Use a device buffer for SkBitmap allocation, use Linear texture on Metal backend."

impeller/renderer/backend/metal/context_mtl.mm

@@ -55,7 +55,6 @@ static bool DeviceSupportsComputeSubgroups(id<MTLDevice> device) {
       .SetSupportsBufferToTextureBlits(true)
       .SetSupportsTextureToTextureBlits(true)
       .SetSupportsDecalTileMode(true)
-      .SetSupportsSharedDeviceBufferTextureMemory(true)
       .SetSupportsFramebufferFetch(DeviceSupportsFramebufferFetch(device))
       .SetDefaultColorFormat(color_format)
       .SetDefaultStencilFormat(PixelFormat::kS8UInt)

impeller/renderer/backend/vulkan/capabilities_vk.cc

@@ -348,16 +348,10 @@ bool CapabilitiesVK::SupportsReadFromOnscreenTexture() const {
   return false;
 }
 
-// |Capabilities|
 bool CapabilitiesVK::SupportsDecalTileMode() const {
   return true;
 }
 
-// |Capabilities|
-bool CapabilitiesVK::SupportsSharedDeviceBufferTextureMemory() const {
-  return false;
-}
-
 // |Capabilities|
 PixelFormat CapabilitiesVK::GetDefaultColorFormat() const {
   return color_format_;

impeller/renderer/backend/vulkan/capabilities_vk.h

@@ -79,9 +79,6 @@ class CapabilitiesVK final : public Capabilities,
   // |Capabilities|
   bool SupportsDecalTileMode() const override;
 
-  // |Capabilities|
-  bool SupportsSharedDeviceBufferTextureMemory() const override;
-
   // |Capabilities|
   PixelFormat GetDefaultColorFormat() const override;
 

impeller/renderer/capabilities.cc

@@ -66,11 +66,6 @@ class StandardCapabilities final : public Capabilities {
     return supports_decal_tile_mode_;
   }
 
-  // |Capabilities|
-  bool SupportsSharedDeviceBufferTextureMemory() const override {
-    return supports_shared_device_buffer_texture_memory_;
-  }
-
   // |Capabilities|
   PixelFormat GetDefaultColorFormat() const override {
     return default_color_format_;
@@ -93,7 +88,6 @@ class StandardCapabilities final : public Capabilities {
                        bool supports_read_from_onscreen_texture,
                        bool supports_read_from_resolve,
                        bool supports_decal_tile_mode,
-                       bool supports_shared_device_buffer_texture_memory,
                        PixelFormat default_color_format,
                        PixelFormat default_stencil_format)
       : has_threading_restrictions_(has_threading_restrictions),
@@ -108,8 +102,6 @@ class StandardCapabilities final : public Capabilities {
             supports_read_from_onscreen_texture),
         supports_read_from_resolve_(supports_read_from_resolve),
         supports_decal_tile_mode_(supports_decal_tile_mode),
-        supports_shared_device_buffer_texture_memory_(
-            supports_shared_device_buffer_texture_memory),
         default_color_format_(default_color_format),
         default_stencil_format_(default_stencil_format) {}
 
@@ -126,7 +118,6 @@ class StandardCapabilities final : public Capabilities {
   bool supports_read_from_onscreen_texture_ = false;
   bool supports_read_from_resolve_ = false;
   bool supports_decal_tile_mode_ = false;
-  bool supports_shared_device_buffer_texture_memory_ = false;
   PixelFormat default_color_format_ = PixelFormat::kUnknown;
   PixelFormat default_stencil_format_ = PixelFormat::kUnknown;
 
@@ -211,12 +202,6 @@ CapabilitiesBuilder& CapabilitiesBuilder::SetSupportsDecalTileMode(bool value) {
   return *this;
 }
 
-CapabilitiesBuilder&
-CapabilitiesBuilder::SetSupportsSharedDeviceBufferTextureMemory(bool value) {
-  supports_shared_device_buffer_texture_memory_ = value;
-  return *this;
-}
-
 std::unique_ptr<Capabilities> CapabilitiesBuilder::Build() {
   return std::unique_ptr<StandardCapabilities>(new StandardCapabilities(  //
       has_threading_restrictions_,                                        //
@@ -230,7 +215,6 @@ std::unique_ptr<Capabilities> CapabilitiesBuilder::Build() {
       supports_read_from_onscreen_texture_,                               //
       supports_read_from_resolve_,                                        //
       supports_decal_tile_mode_,                                          //
-      supports_shared_device_buffer_texture_memory_,                      //
       *default_color_format_,                                             //
       *default_stencil_format_                                            //
       ));

impeller/renderer/capabilities.h

@@ -37,8 +37,6 @@ class Capabilities {
 
   virtual bool SupportsDecalTileMode() const = 0;
 
-  virtual bool SupportsSharedDeviceBufferTextureMemory() const = 0;
-
   virtual PixelFormat GetDefaultColorFormat() const = 0;
 
   virtual PixelFormat GetDefaultStencilFormat() const = 0;
@@ -81,8 +79,6 @@ class CapabilitiesBuilder {
 
   CapabilitiesBuilder& SetSupportsDecalTileMode(bool value);
 
-  CapabilitiesBuilder& SetSupportsSharedDeviceBufferTextureMemory(bool value);
-
   std::unique_ptr<Capabilities> Build();
 
  private:
@@ -97,7 +93,6 @@ class CapabilitiesBuilder {
   bool supports_read_from_onscreen_texture_ = false;
   bool supports_read_from_resolve_ = false;
   bool supports_decal_tile_mode_ = false;
-  bool supports_shared_device_buffer_texture_memory_ = false;
   std::optional<PixelFormat> default_color_format_ = std::nullopt;
   std::optional<PixelFormat> default_stencil_format_ = std::nullopt;
 

impeller/renderer/capabilities_unittests.cc

@@ -29,7 +29,6 @@ CAPABILITY_TEST(SupportsComputeSubgroups, false);
 CAPABILITY_TEST(SupportsReadFromOnscreenTexture, false);
 CAPABILITY_TEST(SupportsReadFromResolve, false);
 CAPABILITY_TEST(SupportsDecalTileMode, false);
-CAPABILITY_TEST(SupportsSharedDeviceBufferTextureMemory, false);
 
 }  // namespace testing
 }  // namespace impeller