/**************************************************************************/
/* metal_device_properties.mm */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
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/**************************************************************************/
/* */
/* Portions of this code were derived from MoltenVK. */
/* */
/* Copyright (c) 2015-2023 The Brenwill Workshop Ltd. */
/* (http://www.brenwill.com) */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
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/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/**************************************************************************/
#import "metal_device_properties.h"
#import <Metal/Metal.h>
#import <spirv_cross.hpp>
#import <spirv_msl.hpp>
// Common scaling multipliers.
#define KIBI (1024)
#define MEBI (KIBI * KIBI)
#if (TARGET_OS_OSX && __MAC_OS_X_VERSION_MAX_ALLOWED < 140000) || (TARGET_OS_IOS && __IPHONE_OS_VERSION_MAX_ALLOWED < 170000)
#define MTLGPUFamilyApple9 (MTLGPUFamily)1009
#endif
API_AVAILABLE(macos(11.0), ios(14.0))
MTLGPUFamily &operator--(MTLGPUFamily &p_family) {
p_family = static_cast<MTLGPUFamily>(static_cast<int>(p_family) - 1);
if (p_family < MTLGPUFamilyApple1) {
p_family = MTLGPUFamilyApple9;
}
return p_family;
}
void MetalDeviceProperties::init_features(id<MTLDevice> p_device) {
features = {};
features.highestFamily = MTLGPUFamilyApple1;
for (MTLGPUFamily family = MTLGPUFamilyApple9; family >= MTLGPUFamilyApple1; --family) {
if ([p_device supportsFamily:family]) {
features.highestFamily = family;
break;
}
}
features.hostMemoryPageSize = sysconf(_SC_PAGESIZE);
for (SampleCount sc = SampleCount1; sc <= SampleCount64; sc <<= 1) {
if ([p_device supportsTextureSampleCount:sc]) {
features.supportedSampleCounts |= sc;
}
}
features.layeredRendering = [p_device supportsFamily:MTLGPUFamilyApple5];
features.multisampleLayeredRendering = [p_device supportsFamily:MTLGPUFamilyApple7];
features.tessellationShader = [p_device supportsFamily:MTLGPUFamilyApple3];
features.imageCubeArray = [p_device supportsFamily:MTLGPUFamilyApple3];
features.quadPermute = [p_device supportsFamily:MTLGPUFamilyApple4];
features.simdPermute = [p_device supportsFamily:MTLGPUFamilyApple6];
features.simdReduction = [p_device supportsFamily:MTLGPUFamilyApple7];
MTLCompileOptions *opts = [MTLCompileOptions new];
features.mslVersionEnum = opts.languageVersion; // By default, Metal uses the most recent language version.
#define setMSLVersion(m_maj, m_min) \
features.mslVersion = SPIRV_CROSS_NAMESPACE::CompilerMSL::Options::make_msl_version(m_maj, m_min)
switch (features.mslVersionEnum) {
#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 150000 || __IPHONE_OS_VERSION_MAX_ALLOWED >= 180000
case MTLLanguageVersion3_2:
setMSLVersion(3, 2);
break;
#endif
#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 140000 || __IPHONE_OS_VERSION_MAX_ALLOWED >= 170000
case MTLLanguageVersion3_1:
setMSLVersion(3, 1);
break;
#endif
case MTLLanguageVersion3_0:
setMSLVersion(3, 0);
break;
case MTLLanguageVersion2_4:
setMSLVersion(2, 4);
break;
case MTLLanguageVersion2_3:
setMSLVersion(2, 3);
break;
case MTLLanguageVersion2_2:
setMSLVersion(2, 2);
break;
case MTLLanguageVersion2_1:
setMSLVersion(2, 1);
break;
case MTLLanguageVersion2_0:
setMSLVersion(2, 0);
break;
case MTLLanguageVersion1_2:
setMSLVersion(1, 2);
break;
case MTLLanguageVersion1_1:
setMSLVersion(1, 1);
break;
#if TARGET_OS_IPHONE && !TARGET_OS_MACCATALYST
case MTLLanguageVersion1_0:
setMSLVersion(1, 0);
break;
#endif
}
}
void MetalDeviceProperties::init_limits(id<MTLDevice> p_device) {
using std::max;
using std::min;
// FST: https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
// FST: Maximum number of layers per 1D texture array, 2D texture array, or 3D texture.
limits.maxImageArrayLayers = 2048;
if ([p_device supportsFamily:MTLGPUFamilyApple3]) {
// FST: Maximum 2D texture width and height.
limits.maxFramebufferWidth = 16384;
limits.maxFramebufferHeight = 16384;
limits.maxViewportDimensionX = 16384;
limits.maxViewportDimensionY = 16384;
// FST: Maximum 1D texture width.
limits.maxImageDimension1D = 16384;
// FST: Maximum 2D texture width and height.
limits.maxImageDimension2D = 16384;
// FST: Maximum cube map texture width and height.
limits.maxImageDimensionCube = 16384;
} else {
// FST: Maximum 2D texture width and height.
limits.maxFramebufferWidth = 8192;
limits.maxFramebufferHeight = 8192;
limits.maxViewportDimensionX = 8192;
limits.maxViewportDimensionY = 8192;
// FST: Maximum 1D texture width.
limits.maxImageDimension1D = 8192;
// FST: Maximum 2D texture width and height.
limits.maxImageDimension2D = 8192;
// FST: Maximum cube map texture width and height.
limits.maxImageDimensionCube = 8192;
}
// FST: Maximum 3D texture width, height, and depth.
limits.maxImageDimension3D = 2048;
limits.maxThreadsPerThreadGroup = p_device.maxThreadsPerThreadgroup;
// No effective limits.
limits.maxComputeWorkGroupCount = { std::numeric_limits<uint32_t>::max(), std::numeric_limits<uint32_t>::max(), std::numeric_limits<uint32_t>::max() };
// https://github.com/KhronosGroup/MoltenVK/blob/568cc3acc0e2299931fdaecaaa1fc3ec5b4af281/MoltenVK/MoltenVK/GPUObjects/MVKDevice.h#L85
limits.maxBoundDescriptorSets = SPIRV_CROSS_NAMESPACE::kMaxArgumentBuffers;
// FST: Maximum number of color render targets per render pass descriptor.
limits.maxColorAttachments = 8;
// Maximum number of textures the device can access, per stage, from an argument buffer.
if ([p_device supportsFamily:MTLGPUFamilyApple6]) {
limits.maxTexturesPerArgumentBuffer = 1'000'000;
} else if ([p_device supportsFamily:MTLGPUFamilyApple4]) {
limits.maxTexturesPerArgumentBuffer = 96;
} else {
limits.maxTexturesPerArgumentBuffer = 31;
}
// Maximum number of samplers the device can access, per stage, from an argument buffer.
if ([p_device supportsFamily:MTLGPUFamilyApple6]) {
limits.maxSamplersPerArgumentBuffer = 1024;
} else {
limits.maxSamplersPerArgumentBuffer = 16;
}
// Maximum number of buffers the device can access, per stage, from an argument buffer.
if ([p_device supportsFamily:MTLGPUFamilyApple6]) {
limits.maxBuffersPerArgumentBuffer = std::numeric_limits<uint64_t>::max();
} else if ([p_device supportsFamily:MTLGPUFamilyApple4]) {
limits.maxBuffersPerArgumentBuffer = 96;
} else {
limits.maxBuffersPerArgumentBuffer = 31;
}
limits.minSubgroupSize = limits.maxSubgroupSize = 1;
// These values were taken from MoltenVK.
if (features.simdPermute) {
limits.minSubgroupSize = 4;
limits.maxSubgroupSize = 32;
} else if (features.quadPermute) {
limits.minSubgroupSize = limits.maxSubgroupSize = 4;
}
limits.subgroupSupportedShaderStages.set_flag(RDD::ShaderStage::SHADER_STAGE_COMPUTE_BIT);
if (features.tessellationShader) {
limits.subgroupSupportedShaderStages.set_flag(RDD::ShaderStage::SHADER_STAGE_TESSELATION_CONTROL_BIT);
}
limits.subgroupSupportedShaderStages.set_flag(RDD::ShaderStage::SHADER_STAGE_FRAGMENT_BIT);
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_BASIC_BIT);
if (features.simdPermute || features.quadPermute) {
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_VOTE_BIT);
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_BALLOT_BIT);
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_SHUFFLE_BIT);
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_SHUFFLE_RELATIVE_BIT);
}
if (features.simdReduction) {
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_ARITHMETIC_BIT);
}
if (features.quadPermute) {
limits.subgroupSupportedOperations.set_flag(RD::SubgroupOperations::SUBGROUP_QUAD_BIT);
}
limits.maxBufferLength = p_device.maxBufferLength;
// FST: Maximum size of vertex descriptor layout stride.
limits.maxVertexDescriptorLayoutStride = std::numeric_limits<uint64_t>::max();
// Maximum number of viewports.
if ([p_device supportsFamily:MTLGPUFamilyApple5]) {
limits.maxViewports = 16;
} else {
limits.maxViewports = 1;
}
limits.maxPerStageBufferCount = 31;
limits.maxPerStageSamplerCount = 16;
if ([p_device supportsFamily:MTLGPUFamilyApple6]) {
limits.maxPerStageTextureCount = 128;
} else if ([p_device supportsFamily:MTLGPUFamilyApple4]) {
limits.maxPerStageTextureCount = 96;
} else {
limits.maxPerStageTextureCount = 31;
}
limits.maxVertexInputAttributes = 31;
limits.maxVertexInputBindings = 31;
limits.maxVertexInputBindingStride = (2 * KIBI);
#if TARGET_OS_IOS && !TARGET_OS_MACCATALYST
limits.minUniformBufferOffsetAlignment = 64;
#endif
#if TARGET_OS_OSX
// This is Apple Silicon specific.
limits.minUniformBufferOffsetAlignment = 16;
#endif
limits.maxDrawIndexedIndexValue = std::numeric_limits<uint32_t>::max() - 1;
}
MetalDeviceProperties::MetalDeviceProperties(id<MTLDevice> p_device) {
init_features(p_device);
init_limits(p_device);
}
MetalDeviceProperties::~MetalDeviceProperties() {
}
SampleCount MetalDeviceProperties::find_nearest_supported_sample_count(RenderingDevice::TextureSamples p_samples) const {
SampleCount supported = features.supportedSampleCounts;
if (supported & sample_count[p_samples]) {
return sample_count[p_samples];
}
SampleCount requested_sample_count = sample_count[p_samples];
// Find the nearest supported sample count.
while (requested_sample_count > SampleCount1) {
if (supported & requested_sample_count) {
return requested_sample_count;
}
requested_sample_count = (SampleCount)(requested_sample_count >> 1);
}
return SampleCount1;
}
// region static members
const SampleCount MetalDeviceProperties::sample_count[RenderingDevice::TextureSamples::TEXTURE_SAMPLES_MAX] = {
SampleCount1,
SampleCount2,
SampleCount4,
SampleCount8,
SampleCount16,
SampleCount32,
SampleCount64,
};
// endregion
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