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[impeller] add CompressionType enum to texture descriptor (flutter/engine#40499)

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[impeller] add CompressionType enum to texture descriptor
This commit is contained in:
Jonah Williams 2023-03-21 13:02:05 -07:00 committed by GitHub
parent fe8250240c
commit d45e6bfccb
2 changed files with 28 additions and 0 deletions
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18
engine/src/flutter/impeller/renderer/backend/metal/allocator_mtl.mm
View File

@ -78,6 +78,17 @@ static ISize DeviceMaxTextureSizeSupported(id<MTLDevice> device) {
}
}
static bool SupportsLossyTextureCompression(id<MTLDevice> device) {
#ifdef FML_OS_IOS_SIMULATOR
return false;
#else
if (@available(macOS 10.15, iOS 13, tvOS 13, *)) {
return [device supportsFamily:MTLGPUFamilyApple8];
}
return false;
#endif
}
AllocatorMTL::AllocatorMTL(id<MTLDevice> device, std::string label)
: device_(device), allocator_label_(std::move(label)) {
if (!device_) {
@ -194,6 +205,13 @@ std::shared_ptr<Texture> AllocatorMTL::OnCreateTexture(
mtl_texture_desc.storageMode = ToMTLStorageMode(
desc.storage_mode, supports_memoryless_targets_, supports_uma_);
if (@available(macOS 12.5, ios 15.0, *)) {
if (desc.compression_type == CompressionType::kLossy &&
SupportsLossyTextureCompression(device_)) {
mtl_texture_desc.compressionType = MTLTextureCompressionTypeLossy;
}
}
auto texture = [device_ newTextureWithDescriptor:mtl_texture_desc];
if (!texture) {
return nullptr;

10
engine/src/flutter/impeller/renderer/texture_descriptor.h
View File

@ -12,6 +12,15 @@
namespace impeller {
//------------------------------------------------------------------------------
/// @brief Additional compression to apply to a texture. This value is
/// ignored on platforms which do not support it.
///
/// Lossy compression is only supported on iOS 15+ on A15 chips.
enum class CompressionType {
kLossless,
kLossy,
};
//------------------------------------------------------------------------------
/// @brief A lightweight object that describes the attributes of a texture
/// that can then used an allocator to create that texture.
@ -25,6 +34,7 @@ struct TextureDescriptor {
TextureUsageMask usage =
static_cast<TextureUsageMask>(TextureUsage::kShaderRead);
SampleCount sample_count = SampleCount::kCount1;
CompressionType compression_type = CompressionType::kLossless;
constexpr size_t GetByteSizeOfBaseMipLevel() const {
if (!IsValid()) {