blob: 33539f77523c9e2ec31abdcdd050bfe61658a310 [file] [log] [blame]
/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/mtl/GrMtlSampler.h"
#include "src/gpu/mtl/GrMtlGpu.h"
#if !__has_feature(objc_arc)
#error This file must be compiled with Arc. Use -fobjc-arc flag
#endif
static inline MTLSamplerAddressMode wrap_mode_to_mtl_sampler_address(
GrSamplerState::WrapMode wrapMode, const GrCaps& caps) {
switch (wrapMode) {
case GrSamplerState::WrapMode::kClamp:
return MTLSamplerAddressModeClampToEdge;
case GrSamplerState::WrapMode::kRepeat:
return MTLSamplerAddressModeRepeat;
case GrSamplerState::WrapMode::kMirrorRepeat:
return MTLSamplerAddressModeMirrorRepeat;
case GrSamplerState::WrapMode::kClampToBorder:
// Must guard the reference to the clamp to border address mode by macro since iOS or
// older MacOS builds will fail if it's referenced, even if other code makes sure it's
// never used.
#ifdef SK_BUILD_FOR_MAC
if (@available(macOS 10.12, *)) {
SkASSERT(caps.clampToBorderSupport());
return MTLSamplerAddressModeClampToBorderColor;
} else
#endif
{
SkASSERT(false);
return MTLSamplerAddressModeClampToEdge;
}
}
SK_ABORT("Unknown wrap mode.");
}
GrMtlSampler* GrMtlSampler::Create(const GrMtlGpu* gpu, GrSamplerState samplerState) {
MTLSamplerMinMagFilter minMagFilter = [&] {
switch (samplerState.filter()) {
case GrSamplerState::Filter::kNearest: return MTLSamplerMinMagFilterNearest;
case GrSamplerState::Filter::kLinear: return MTLSamplerMinMagFilterLinear;
}
SkUNREACHABLE;
}();
MTLSamplerMipFilter mipFilter = [&] {
switch (samplerState.mipmapMode()) {
case GrSamplerState::MipmapMode::kNone: return MTLSamplerMipFilterNotMipmapped;
case GrSamplerState::MipmapMode::kNearest: return MTLSamplerMipFilterNearest;
case GrSamplerState::MipmapMode::kLinear: return MTLSamplerMipFilterLinear;
}
SkUNREACHABLE;
}();
auto samplerDesc = [[MTLSamplerDescriptor alloc] init];
samplerDesc.rAddressMode = MTLSamplerAddressModeClampToEdge;
samplerDesc.sAddressMode = wrap_mode_to_mtl_sampler_address(samplerState.wrapModeX(),
gpu->mtlCaps());
samplerDesc.tAddressMode = wrap_mode_to_mtl_sampler_address(samplerState.wrapModeY(),
gpu->mtlCaps());
samplerDesc.magFilter = minMagFilter;
samplerDesc.minFilter = minMagFilter;
samplerDesc.mipFilter = mipFilter;
samplerDesc.lodMinClamp = 0.0f;
samplerDesc.lodMaxClamp = FLT_MAX; // default value according to docs.
samplerDesc.maxAnisotropy = 1.0f;
samplerDesc.normalizedCoordinates = true;
if (@available(macOS 10.11, iOS 9.0, *)) {
samplerDesc.compareFunction = MTLCompareFunctionNever;
}
return new GrMtlSampler([gpu->device() newSamplerStateWithDescriptor: samplerDesc],
GenerateKey(samplerState));
}
GrMtlSampler::Key GrMtlSampler::GenerateKey(GrSamplerState samplerState) {
return samplerState.asIndex();
}