// Copyright 2021 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "dawn/native/TintUtils.h"

#include "dawn/native/BindGroupLayoutInternal.h"
#include "dawn/native/Device.h"
#include "dawn/native/Pipeline.h"
#include "dawn/native/PipelineLayout.h"
#include "dawn/native/RenderPipeline.h"
#include "tint/tint.h"

namespace dawn::native {

namespace {

tint::VertexFormat ToTintVertexFormat(wgpu::VertexFormat format) {
    switch (format) {
        case wgpu::VertexFormat::Uint8:
            return tint::VertexFormat::kUint8;
        case wgpu::VertexFormat::Uint8x2:
            return tint::VertexFormat::kUint8x2;
        case wgpu::VertexFormat::Uint8x4:
            return tint::VertexFormat::kUint8x4;
        case wgpu::VertexFormat::Sint8:
            return tint::VertexFormat::kSint8;
        case wgpu::VertexFormat::Sint8x2:
            return tint::VertexFormat::kSint8x2;
        case wgpu::VertexFormat::Sint8x4:
            return tint::VertexFormat::kSint8x4;
        case wgpu::VertexFormat::Unorm8:
            return tint::VertexFormat::kUnorm8;
        case wgpu::VertexFormat::Unorm8x2:
            return tint::VertexFormat::kUnorm8x2;
        case wgpu::VertexFormat::Unorm8x4:
            return tint::VertexFormat::kUnorm8x4;
        case wgpu::VertexFormat::Snorm8:
            return tint::VertexFormat::kSnorm8;
        case wgpu::VertexFormat::Snorm8x2:
            return tint::VertexFormat::kSnorm8x2;
        case wgpu::VertexFormat::Snorm8x4:
            return tint::VertexFormat::kSnorm8x4;
        case wgpu::VertexFormat::Uint16:
            return tint::VertexFormat::kUint16;
        case wgpu::VertexFormat::Uint16x2:
            return tint::VertexFormat::kUint16x2;
        case wgpu::VertexFormat::Uint16x4:
            return tint::VertexFormat::kUint16x4;
        case wgpu::VertexFormat::Sint16:
            return tint::VertexFormat::kSint16;
        case wgpu::VertexFormat::Sint16x2:
            return tint::VertexFormat::kSint16x2;
        case wgpu::VertexFormat::Sint16x4:
            return tint::VertexFormat::kSint16x4;
        case wgpu::VertexFormat::Unorm16:
            return tint::VertexFormat::kUnorm16;
        case wgpu::VertexFormat::Unorm16x2:
            return tint::VertexFormat::kUnorm16x2;
        case wgpu::VertexFormat::Unorm16x4:
            return tint::VertexFormat::kUnorm16x4;
        case wgpu::VertexFormat::Snorm16:
            return tint::VertexFormat::kSnorm16;
        case wgpu::VertexFormat::Snorm16x2:
            return tint::VertexFormat::kSnorm16x2;
        case wgpu::VertexFormat::Snorm16x4:
            return tint::VertexFormat::kSnorm16x4;
        case wgpu::VertexFormat::Float16:
            return tint::VertexFormat::kFloat16;
        case wgpu::VertexFormat::Float16x2:
            return tint::VertexFormat::kFloat16x2;
        case wgpu::VertexFormat::Float16x4:
            return tint::VertexFormat::kFloat16x4;
        case wgpu::VertexFormat::Float32:
            return tint::VertexFormat::kFloat32;
        case wgpu::VertexFormat::Float32x2:
            return tint::VertexFormat::kFloat32x2;
        case wgpu::VertexFormat::Float32x3:
            return tint::VertexFormat::kFloat32x3;
        case wgpu::VertexFormat::Float32x4:
            return tint::VertexFormat::kFloat32x4;
        case wgpu::VertexFormat::Uint32:
            return tint::VertexFormat::kUint32;
        case wgpu::VertexFormat::Uint32x2:
            return tint::VertexFormat::kUint32x2;
        case wgpu::VertexFormat::Uint32x3:
            return tint::VertexFormat::kUint32x3;
        case wgpu::VertexFormat::Uint32x4:
            return tint::VertexFormat::kUint32x4;
        case wgpu::VertexFormat::Sint32:
            return tint::VertexFormat::kSint32;
        case wgpu::VertexFormat::Sint32x2:
            return tint::VertexFormat::kSint32x2;
        case wgpu::VertexFormat::Sint32x3:
            return tint::VertexFormat::kSint32x3;
        case wgpu::VertexFormat::Sint32x4:
            return tint::VertexFormat::kSint32x4;
        case wgpu::VertexFormat::Unorm10_10_10_2:
            return tint::VertexFormat::kUnorm10_10_10_2;
        case wgpu::VertexFormat::Unorm8x4BGRA:
            return tint::VertexFormat::kUnorm8x4BGRA;
    }
    DAWN_UNREACHABLE();
}

tint::VertexStepMode ToTintVertexStepMode(wgpu::VertexStepMode mode) {
    switch (mode) {
        case wgpu::VertexStepMode::Vertex:
            return tint::VertexStepMode::kVertex;
        case wgpu::VertexStepMode::Instance:
            return tint::VertexStepMode::kInstance;
        case wgpu::VertexStepMode::Undefined:
            break;
    }
    DAWN_UNREACHABLE();
}

}  // namespace

tint::VertexPullingConfig BuildVertexPullingTransformConfig(
    const RenderPipelineBase& renderPipeline,
    BindGroupIndex pullingBufferBindingSet) {
    tint::VertexPullingConfig cfg;
    cfg.pulling_group = uint32_t(pullingBufferBindingSet);

    cfg.vertex_state.resize(renderPipeline.GetVertexBufferCount());
    for (VertexBufferSlot slot : renderPipeline.GetVertexBuffersUsed()) {
        const VertexBufferInfo& dawnInfo = renderPipeline.GetVertexBuffer(slot);
        tint::VertexBufferLayoutDescriptor* tintInfo =
            &cfg.vertex_state[static_cast<uint8_t>(slot)];

        tintInfo->array_stride = uint32_t(dawnInfo.arrayStride);
        tintInfo->step_mode = ToTintVertexStepMode(dawnInfo.stepMode);
    }

    for (VertexAttributeLocation location : renderPipeline.GetAttributeLocationsUsed()) {
        const VertexAttributeInfo& dawnInfo = renderPipeline.GetAttribute(location);
        tint::VertexAttributeDescriptor tintInfo;
        tintInfo.format = ToTintVertexFormat(dawnInfo.format);
        tintInfo.offset = uint32_t(dawnInfo.offset);
        tintInfo.shader_location = uint32_t(static_cast<uint8_t>(location));

        uint8_t vertexBufferSlot = static_cast<uint8_t>(dawnInfo.vertexBufferSlot);
        cfg.vertex_state[vertexBufferSlot].attributes.push_back(tintInfo);
    }
    return cfg;
}

std::unordered_map<tint::OverrideId, double> BuildSubstituteOverridesTransformConfig(
    const ProgrammableStage& stage) {
    return BuildSubstituteOverridesTransformConfig(*stage.metadata, stage.constants);
}

std::unordered_map<tint::OverrideId, double> BuildSubstituteOverridesTransformConfig(
    const EntryPointMetadata& metadata,
    const PipelineConstantEntries& constants) {
    std::unordered_map<tint::OverrideId, double> map;
    for (const auto& [key, value] : constants) {
        const auto& o = metadata.overrides.at(key);
        map.insert({{o.id.value}, value});
    }
    return map;
}

}  // namespace dawn::native