src/common/Constants.h

// 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
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COMMON_CONSTANTS_H_
#define COMMON_CONSTANTS_H_

#include <cstdint>

static constexpr uint32_t kMaxPushConstants = 32u;
static constexpr uint32_t kMaxBindGroups = 4u;
// TODO(cwallez@chromium.org): 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 maxVertexInputStride instead in future.
static constexpr uint32_t kMaxVertexAttributeEnd = 2048u;
static constexpr uint32_t kMaxVertexInputs = 16u;
static constexpr uint32_t kMaxVertexInputStride = 2048u;
static constexpr uint32_t kNumStages = 3;
static constexpr uint32_t kMaxColorAttachments = 4u;
static constexpr uint32_t kTextureRowPitchAlignment = 256u;

// Non spec defined constants.
static constexpr float kLodMin = 0.0;
static constexpr float kLodMax = 1000.0;

#endif  // COMMON_CONSTANTS_H_