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// Copyright 2017 The Dawn Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cstdint>
static constexpr uint32_t kMaxBindGroups = 4u;
// TODO( investigate bindgroup limits
static constexpr uint32_t kMaxBindingsPerGroup = 16u;
static constexpr uint32_t kMaxVertexAttributes = 16u;
// Vulkan has a standalone limit named maxVertexInputAttributeOffset (2047u at least) for vertex
// attribute offset. The limit might be meaningless because Vulkan has another limit named
// maxVertexInputBindingStride (2048u at least). We use maxVertexAttributeEnd (2048u) here to
// verify vertex attribute offset, which equals to maxOffset + smallest size of vertex format
// (char). We may use maxVertexInputBindingStride (maxVertexBufferStride below) instead to replace
// maxVertexAttributeEnd in future.
static constexpr uint32_t kMaxVertexAttributeEnd = 2048u;
static constexpr uint32_t kMaxVertexBuffers = 16u;
static constexpr uint32_t kMaxVertexBufferStride = 2048u;
static constexpr uint32_t kNumStages = 3;
static constexpr uint32_t kMaxColorAttachments = 4u;
static constexpr uint32_t kTextureBytesPerRowAlignment = 256u;
// Dynamic buffer offsets require offset to be divisible by 256
static constexpr uint64_t kMinDynamicBufferOffsetAlignment = 256u;
// Max numbers of dynamic uniform buffers
static constexpr uint32_t kMaxDynamicUniformBufferCount = 8u;
// Max numbers of dynamic storage buffers
static constexpr uint32_t kMaxDynamicStorageBufferCount = 4u;
// Max numbers of dynamic buffers
static constexpr uint32_t kMaxDynamicBufferCount =
kMaxDynamicUniformBufferCount + kMaxDynamicStorageBufferCount;
// Max size of uniform buffer binding
static constexpr uint64_t kMaxUniformBufferBindingSize = 16384u;
// Indirect command sizes
static constexpr uint64_t kDispatchIndirectSize = 3 * sizeof(uint32_t);
static constexpr uint64_t kDrawIndirectSize = 4 * sizeof(uint32_t);
static constexpr uint64_t kDrawIndexedIndirectSize = 5 * sizeof(uint32_t);
// Non spec defined constants.
static constexpr float kLodMin = 0.0;
static constexpr float kLodMax = 1000.0;
// Max texture size constants
static constexpr uint32_t kMaxTextureSize = 8192u;
static constexpr uint32_t kMaxTexture2DArrayLayers = 256u;
static constexpr uint32_t kMaxTexture2DMipLevels = 14u;
static_assert(1 << (kMaxTexture2DMipLevels - 1) == kMaxTextureSize,
"kMaxTexture2DMipLevels and kMaxTextureSize size mismatch");