/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef skgpu_VulkanUtilsPriv_DEFINED
#define skgpu_VulkanUtilsPriv_DEFINED

#include <cstdint>
#include <string>

#include "include/gpu/vk/VulkanTypes.h"
#include "src/gpu/vk/VulkanInterface.h"

#include "include/core/SkColor.h"
#include "src/gpu/PipelineUtils.h"
#include "src/sksl/codegen/SkSLSPIRVCodeGenerator.h"

#ifdef SK_BUILD_FOR_ANDROID
#include <android/hardware_buffer.h>
#endif

namespace SkSL {

enum class ProgramKind : int8_t;
struct ProgramInterface;
struct ProgramSettings;
struct ShaderCaps;

}  // namespace SkSL

namespace skgpu {

class ShaderErrorHandler;

inline bool SkSLToSPIRV(const SkSL::ShaderCaps* caps,
                        const std::string& sksl,
                        SkSL::ProgramKind programKind,
                        const SkSL::ProgramSettings& settings,
                        std::string* spirv,
                        SkSL::ProgramInterface* outInterface,
                        ShaderErrorHandler* errorHandler) {
    return SkSLToBackend(caps, &SkSL::ToSPIRV, /*backendLabel=*/nullptr,
                         sksl, programKind, settings, spirv, outInterface, errorHandler);
}

static constexpr uint32_t VkFormatChannels(VkFormat vkFormat) {
    switch (vkFormat) {
        case VK_FORMAT_R8G8B8A8_UNORM:           return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R8_UNORM:                 return kRed_SkColorChannelFlag;
        case VK_FORMAT_B8G8R8A8_UNORM:           return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R5G6B5_UNORM_PACK16:      return kRGB_SkColorChannelFlags;
        case VK_FORMAT_B5G6R5_UNORM_PACK16:      return kRGB_SkColorChannelFlags;
        case VK_FORMAT_R16G16B16A16_SFLOAT:      return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R16_SFLOAT:               return kRed_SkColorChannelFlag;
        case VK_FORMAT_R8G8B8_UNORM:             return kRGB_SkColorChannelFlags;
        case VK_FORMAT_R8G8_UNORM:               return kRG_SkColorChannelFlags;
        case VK_FORMAT_A2B10G10R10_UNORM_PACK32: return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_A2R10G10B10_UNORM_PACK32: return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_B4G4R4A4_UNORM_PACK16:    return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R4G4B4A4_UNORM_PACK16:    return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R8G8B8A8_SRGB:            return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK:  return kRGB_SkColorChannelFlags;
        case VK_FORMAT_BC1_RGB_UNORM_BLOCK:      return kRGB_SkColorChannelFlags;
        case VK_FORMAT_BC1_RGBA_UNORM_BLOCK:     return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R16_UNORM:                return kRed_SkColorChannelFlag;
        case VK_FORMAT_R16G16_UNORM:             return kRG_SkColorChannelFlags;
        case VK_FORMAT_R16G16B16A16_UNORM:       return kRGBA_SkColorChannelFlags;
        case VK_FORMAT_R16G16_SFLOAT:            return kRG_SkColorChannelFlags;
        case VK_FORMAT_S8_UINT:                  return 0;
        case VK_FORMAT_D24_UNORM_S8_UINT:        return 0;
        case VK_FORMAT_D32_SFLOAT_S8_UINT:       return 0;
        default:                                 return 0;
    }
}

static constexpr size_t VkFormatBytesPerBlock(VkFormat vkFormat) {
    switch (vkFormat) {
        case VK_FORMAT_R8G8B8A8_UNORM:            return 4;
        case VK_FORMAT_R8_UNORM:                  return 1;
        case VK_FORMAT_B8G8R8A8_UNORM:            return 4;
        case VK_FORMAT_R5G6B5_UNORM_PACK16:       return 2;
        case VK_FORMAT_B5G6R5_UNORM_PACK16:       return 2;
        case VK_FORMAT_R16G16B16A16_SFLOAT:       return 8;
        case VK_FORMAT_R16_SFLOAT:                return 2;
        case VK_FORMAT_R8G8B8_UNORM:              return 3;
        case VK_FORMAT_R8G8_UNORM:                return 2;
        case VK_FORMAT_A2B10G10R10_UNORM_PACK32:  return 4;
        case VK_FORMAT_A2R10G10B10_UNORM_PACK32:  return 4;
        case VK_FORMAT_B4G4R4A4_UNORM_PACK16:     return 2;
        case VK_FORMAT_R4G4B4A4_UNORM_PACK16:     return 2;
        case VK_FORMAT_R8G8B8A8_SRGB:             return 4;
        case VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK:   return 8;
        case VK_FORMAT_BC1_RGB_UNORM_BLOCK:       return 8;
        case VK_FORMAT_BC1_RGBA_UNORM_BLOCK:      return 8;
        case VK_FORMAT_R16_UNORM:                 return 2;
        case VK_FORMAT_R16G16_UNORM:              return 4;
        case VK_FORMAT_R16G16B16A16_UNORM:        return 8;
        case VK_FORMAT_R16G16_SFLOAT:             return 4;
        // Currently we are just over estimating this value to be used in gpu size calculations even
        // though the actually size is probably less. We should instead treat planar formats similar
        // to compressed textures that go through their own special query for calculating size.
        case VK_FORMAT_G8_B8_R8_3PLANE_420_UNORM: return 3;
        case VK_FORMAT_G8_B8R8_2PLANE_420_UNORM:  return 3;
        case VK_FORMAT_G10X6_B10X6R10X6_2PLANE_420_UNORM_3PACK16: return 6;
        case VK_FORMAT_S8_UINT:                   return 1;
        case VK_FORMAT_D24_UNORM_S8_UINT:         return 4;
        case VK_FORMAT_D32_SFLOAT_S8_UINT:        return 8;

        default:                                 return 0;
    }
}

static constexpr int VkFormatIsStencil(VkFormat format) {
    switch (format) {
        case VK_FORMAT_S8_UINT:
        case VK_FORMAT_D24_UNORM_S8_UINT:
        case VK_FORMAT_D32_SFLOAT_S8_UINT:
            return true;
        default:
            return false;
    }
}

static constexpr int VkFormatIsDepth(VkFormat format) {
    switch (format) {
        case VK_FORMAT_D24_UNORM_S8_UINT:
        case VK_FORMAT_D32_SFLOAT_S8_UINT:
            return true;
        default:
            return false;
    }
}

static constexpr int VkFormatStencilBits(VkFormat format) {
    switch (format) {
        case VK_FORMAT_S8_UINT:
            return 8;
        case VK_FORMAT_D24_UNORM_S8_UINT:
            return 8;
        case VK_FORMAT_D32_SFLOAT_S8_UINT:
            return 8;
        default:
            return 0;
    }
}

static constexpr bool VkFormatNeedsYcbcrSampler(VkFormat format)  {
    return format == VK_FORMAT_G8_B8R8_2PLANE_420_UNORM ||
           format == VK_FORMAT_G8_B8_R8_3PLANE_420_UNORM ||
           format == VK_FORMAT_G10X6_B10X6R10X6_2PLANE_420_UNORM_3PACK16;
}

static constexpr bool SampleCountToVkSampleCount(uint32_t samples,
                                                 VkSampleCountFlagBits* vkSamples) {
    SkASSERT(samples >= 1);
    switch (samples) {
        case 1:
            *vkSamples = VK_SAMPLE_COUNT_1_BIT;
            return true;
        case 2:
            *vkSamples = VK_SAMPLE_COUNT_2_BIT;
            return true;
        case 4:
            *vkSamples = VK_SAMPLE_COUNT_4_BIT;
            return true;
        case 8:
            *vkSamples = VK_SAMPLE_COUNT_8_BIT;
            return true;
        case 16:
            *vkSamples = VK_SAMPLE_COUNT_16_BIT;
            return true;
        default:
            return false;
    }
}

/**
 * Returns true if the format is compressed.
 */
static constexpr bool VkFormatIsCompressed(VkFormat vkFormat) {
    switch (vkFormat) {
        case VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK:
        case VK_FORMAT_BC1_RGB_UNORM_BLOCK:
        case VK_FORMAT_BC1_RGBA_UNORM_BLOCK:
            return true;
        default:
            return false;
    }
    SkUNREACHABLE;
}

/**
 * Returns a ptr to the requested extension feature struct or nullptr if it is not present.
*/
template<typename T> T* GetExtensionFeatureStruct(const VkPhysicalDeviceFeatures2& features,
                                                  VkStructureType type) {
    // All Vulkan structs that could be part of the features chain will start with the
    // structure type followed by the pNext pointer. We cast to the CommonVulkanHeader
    // so we can get access to the pNext for the next struct.
    struct CommonVulkanHeader {
        VkStructureType sType;
        void*           pNext;
    };

    void* pNext = features.pNext;
    while (pNext) {
        CommonVulkanHeader* header = static_cast<CommonVulkanHeader*>(pNext);
        if (header->sType == type) {
            return static_cast<T*>(pNext);
        }
        pNext = header->pNext;
    }
    return nullptr;
}

/**
 * Returns a populated VkSamplerYcbcrConversionCreateInfo object based on VulkanYcbcrConversionInfo
*/
void SetupSamplerYcbcrConversionInfo(VkSamplerYcbcrConversionCreateInfo* outInfo,
                                     const VulkanYcbcrConversionInfo& conversionInfo);

static constexpr const char* VkFormatToStr(VkFormat vkFormat) {
    switch (vkFormat) {
        case VK_FORMAT_R8G8B8A8_UNORM:           return "R8G8B8A8_UNORM";
        case VK_FORMAT_R8_UNORM:                 return "R8_UNORM";
        case VK_FORMAT_B8G8R8A8_UNORM:           return "B8G8R8A8_UNORM";
        case VK_FORMAT_R5G6B5_UNORM_PACK16:      return "R5G6B5_UNORM_PACK16";
        case VK_FORMAT_B5G6R5_UNORM_PACK16:      return "B5G6R5_UNORM_PACK16";
        case VK_FORMAT_R16G16B16A16_SFLOAT:      return "R16G16B16A16_SFLOAT";
        case VK_FORMAT_R16_SFLOAT:               return "R16_SFLOAT";
        case VK_FORMAT_R8G8B8_UNORM:             return "R8G8B8_UNORM";
        case VK_FORMAT_R8G8_UNORM:               return "R8G8_UNORM";
        case VK_FORMAT_A2B10G10R10_UNORM_PACK32: return "A2B10G10R10_UNORM_PACK32";
        case VK_FORMAT_A2R10G10B10_UNORM_PACK32: return "A2R10G10B10_UNORM_PACK32";
        case VK_FORMAT_B4G4R4A4_UNORM_PACK16:    return "B4G4R4A4_UNORM_PACK16";
        case VK_FORMAT_R4G4B4A4_UNORM_PACK16:    return "R4G4B4A4_UNORM_PACK16";
        case VK_FORMAT_R32G32B32A32_SFLOAT:      return "R32G32B32A32_SFLOAT";
        case VK_FORMAT_R8G8B8A8_SRGB:            return "R8G8B8A8_SRGB";
        case VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK:  return "ETC2_R8G8B8_UNORM_BLOCK";
        case VK_FORMAT_BC1_RGB_UNORM_BLOCK:      return "BC1_RGB_UNORM_BLOCK";
        case VK_FORMAT_BC1_RGBA_UNORM_BLOCK:     return "BC1_RGBA_UNORM_BLOCK";
        case VK_FORMAT_R16_UNORM:                return "R16_UNORM";
        case VK_FORMAT_R16G16_UNORM:             return "R16G16_UNORM";
        case VK_FORMAT_R16G16B16A16_UNORM:       return "R16G16B16A16_UNORM";
        case VK_FORMAT_R16G16_SFLOAT:            return "R16G16_SFLOAT";
        case VK_FORMAT_S8_UINT:                  return "S8_UINT";
        case VK_FORMAT_D24_UNORM_S8_UINT:        return "D24_UNORM_S8_UINT";
        case VK_FORMAT_D32_SFLOAT_S8_UINT:       return "D32_SFLOAT_S8_UINT";

        default:                                 return "Unknown";
    }
}

#ifdef SK_BUILD_FOR_ANDROID
/**
 * Vulkan AHardwareBuffer utility functions shared between graphite and ganesh
*/
void GetYcbcrConversionInfoFromFormatProps(
        VulkanYcbcrConversionInfo* outConversionInfo,
        const VkAndroidHardwareBufferFormatPropertiesANDROID& formatProps);

bool GetAHardwareBufferProperties(
        VkAndroidHardwareBufferFormatPropertiesANDROID* outHwbFormatProps,
        VkAndroidHardwareBufferPropertiesANDROID* outHwbProps,
        const skgpu::VulkanInterface*,
        const AHardwareBuffer*,
        VkDevice);

bool AllocateAndBindImageMemory(skgpu::VulkanAlloc* outVulkanAlloc,
                                VkImage,
                                const VkPhysicalDeviceMemoryProperties2&,
                                const VkAndroidHardwareBufferPropertiesANDROID&,
                                AHardwareBuffer*,
                                const skgpu::VulkanInterface*,
                                VkDevice);

#endif // SK_BUILD_FOR_ANDROID

/**
 * Calls faultProc with faultContext; passes debug info if VK_EXT_device_fault is supported/enabled.
 *
 * Note: must only be called *after* receiving VK_ERROR_DEVICE_LOST.
 */
void InvokeDeviceLostCallback(const skgpu::VulkanInterface* vulkanInterface,
                              VkDevice vkDevice,
                              skgpu::VulkanDeviceLostContext faultContext,
                              skgpu::VulkanDeviceLostProc faultProc,
                              bool supportsDeviceFaultInfoExtension);

}  // namespace skgpu

#endif // skgpu_VulkanUtilsPriv_DEFINED
