/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2021  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include "common/Vulkan/Util.h"
#include "common/Vulkan/Context.h"
#include "common/Vulkan/ShaderCompiler.h"
#include "common/Assertions.h"
#include "common/Console.h"
#include "common/StringUtil.h"

#include <cmath>

namespace Vulkan
{
	namespace Util
	{
		bool IsDepthFormat(VkFormat format)
		{
			switch (format)
			{
				case VK_FORMAT_D16_UNORM:
				case VK_FORMAT_D16_UNORM_S8_UINT:
				case VK_FORMAT_D24_UNORM_S8_UINT:
				case VK_FORMAT_D32_SFLOAT:
				case VK_FORMAT_D32_SFLOAT_S8_UINT:
					return true;
				default:
					return false;
			}
		}

		bool IsDepthStencilFormat(VkFormat format)
		{
			switch (format)
			{
				case VK_FORMAT_D16_UNORM_S8_UINT:
				case VK_FORMAT_D24_UNORM_S8_UINT:
				case VK_FORMAT_D32_SFLOAT_S8_UINT:
					return true;
				default:
					return false;
			}
		}

		VkFormat GetLinearFormat(VkFormat format)
		{
			switch (format)
			{
				case VK_FORMAT_R8_SRGB:
					return VK_FORMAT_R8_UNORM;
				case VK_FORMAT_R8G8_SRGB:
					return VK_FORMAT_R8G8_UNORM;
				case VK_FORMAT_R8G8B8_SRGB:
					return VK_FORMAT_R8G8B8_UNORM;
				case VK_FORMAT_R8G8B8A8_SRGB:
					return VK_FORMAT_R8G8B8A8_UNORM;
				case VK_FORMAT_B8G8R8_SRGB:
					return VK_FORMAT_B8G8R8_UNORM;
				case VK_FORMAT_B8G8R8A8_SRGB:
					return VK_FORMAT_B8G8R8A8_UNORM;
				default:
					return format;
			}
		}

		u32 GetTexelSize(VkFormat format)
		{
			// Only contains pixel formats we use.
			switch (format)
			{
				case VK_FORMAT_R8_UNORM:
					return 1;

				case VK_FORMAT_R5G5B5A1_UNORM_PACK16:
				case VK_FORMAT_A1R5G5B5_UNORM_PACK16:
				case VK_FORMAT_R5G6B5_UNORM_PACK16:
				case VK_FORMAT_B5G6R5_UNORM_PACK16:
				case VK_FORMAT_R16_UINT:
					return 2;

				case VK_FORMAT_R8G8B8A8_UNORM:
				case VK_FORMAT_B8G8R8A8_UNORM:
				case VK_FORMAT_R32_UINT:
				case VK_FORMAT_R32_SFLOAT:
				case VK_FORMAT_D32_SFLOAT:
					return 4;

				case VK_FORMAT_BC1_RGBA_UNORM_BLOCK:
					return 8;

				case VK_FORMAT_BC2_UNORM_BLOCK:
				case VK_FORMAT_BC3_UNORM_BLOCK:
				case VK_FORMAT_BC7_UNORM_BLOCK:
					return 16;

				default:
					pxFailRel("Unhandled pixel format");
					return 1;
			}
		}

		VkBlendFactor GetAlphaBlendFactor(VkBlendFactor factor)
		{
			switch (factor)
			{
				case VK_BLEND_FACTOR_SRC_COLOR:
					return VK_BLEND_FACTOR_SRC_ALPHA;
				case VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR:
					return VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
				case VK_BLEND_FACTOR_DST_COLOR:
					return VK_BLEND_FACTOR_DST_ALPHA;
				case VK_BLEND_FACTOR_ONE_MINUS_DST_COLOR:
					return VK_BLEND_FACTOR_ONE_MINUS_DST_ALPHA;
				default:
					return factor;
			}
		}

		void SetViewport(VkCommandBuffer command_buffer, int x, int y, int width, int height,
			float min_depth /*= 0.0f*/, float max_depth /*= 1.0f*/)
		{
			const VkViewport vp{static_cast<float>(x), static_cast<float>(y), static_cast<float>(width),
				static_cast<float>(height), min_depth, max_depth};
			vkCmdSetViewport(command_buffer, 0, 1, &vp);
		}

		void SetScissor(VkCommandBuffer command_buffer, int x, int y, int width, int height)
		{
			const VkRect2D scissor{{x, y}, {static_cast<u32>(width), static_cast<u32>(height)}};
			vkCmdSetScissor(command_buffer, 0, 1, &scissor);
		}

		void SetViewportAndScissor(VkCommandBuffer command_buffer, int x, int y, int width, int height,
			float min_depth /* = 0.0f */, float max_depth /* = 1.0f */)
		{
		}

		void SafeDestroyFramebuffer(VkFramebuffer& fb)
		{
			if (fb != VK_NULL_HANDLE)
			{
				vkDestroyFramebuffer(g_vulkan_context->GetDevice(), fb, nullptr);
				fb = VK_NULL_HANDLE;
			}
		}

		void SafeDestroyShaderModule(VkShaderModule& sm)
		{
			if (sm != VK_NULL_HANDLE)
			{
				vkDestroyShaderModule(g_vulkan_context->GetDevice(), sm, nullptr);
				sm = VK_NULL_HANDLE;
			}
		}

		void SafeDestroyPipeline(VkPipeline& p)
		{
			if (p != VK_NULL_HANDLE)
			{
				vkDestroyPipeline(g_vulkan_context->GetDevice(), p, nullptr);
				p = VK_NULL_HANDLE;
			}
		}

		void SafeDestroyPipelineLayout(VkPipelineLayout& pl)
		{
			if (pl != VK_NULL_HANDLE)
			{
				vkDestroyPipelineLayout(g_vulkan_context->GetDevice(), pl, nullptr);
				pl = VK_NULL_HANDLE;
			}
		}

		void SafeDestroyDescriptorSetLayout(VkDescriptorSetLayout& dsl)
		{
			if (dsl != VK_NULL_HANDLE)
			{
				vkDestroyDescriptorSetLayout(g_vulkan_context->GetDevice(), dsl, nullptr);
				dsl = VK_NULL_HANDLE;
			}
		}

		void SafeDestroyBufferView(VkBufferView& bv)
		{
			if (bv != VK_NULL_HANDLE)
			{
				vkDestroyBufferView(g_vulkan_context->GetDevice(), bv, nullptr);
				bv = VK_NULL_HANDLE;
			}
		}

		void SafeDestroyImageView(VkImageView& iv)
		{
			if (iv != VK_NULL_HANDLE)
			{
				vkDestroyImageView(g_vulkan_context->GetDevice(), iv, nullptr);
				iv = VK_NULL_HANDLE;
			}
		}

		void SafeDestroySampler(VkSampler& samp)
		{
			if (samp != VK_NULL_HANDLE)
			{
				vkDestroySampler(g_vulkan_context->GetDevice(), samp, nullptr);
				samp = VK_NULL_HANDLE;
			}
		}

		void SafeDestroySemaphore(VkSemaphore& sem)
		{
			if (sem != VK_NULL_HANDLE)
			{
				vkDestroySemaphore(g_vulkan_context->GetDevice(), sem, nullptr);
				sem = VK_NULL_HANDLE;
			}
		}

		void SafeFreeGlobalDescriptorSet(VkDescriptorSet& ds)
		{
			if (ds != VK_NULL_HANDLE)
			{
				g_vulkan_context->FreeGlobalDescriptorSet(ds);
				ds = VK_NULL_HANDLE;
			}
		}

		void BufferMemoryBarrier(VkCommandBuffer command_buffer, VkBuffer buffer, VkAccessFlags src_access_mask,
			VkAccessFlags dst_access_mask, VkDeviceSize offset, VkDeviceSize size, VkPipelineStageFlags src_stage_mask,
			VkPipelineStageFlags dst_stage_mask)
		{
			VkBufferMemoryBarrier buffer_info = {
				VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER, // VkStructureType    sType
				nullptr, // const void*        pNext
				src_access_mask, // VkAccessFlags      srcAccessMask
				dst_access_mask, // VkAccessFlags      dstAccessMask
				VK_QUEUE_FAMILY_IGNORED, // uint32_t           srcQueueFamilyIndex
				VK_QUEUE_FAMILY_IGNORED, // uint32_t           dstQueueFamilyIndex
				buffer, // VkBuffer           buffer
				offset, // VkDeviceSize       offset
				size // VkDeviceSize       size
			};

			vkCmdPipelineBarrier(
				command_buffer, src_stage_mask, dst_stage_mask, 0, 0, nullptr, 1, &buffer_info, 0, nullptr);
		}

		void AddPointerToChain(void* head, const void* ptr)
		{
			VkBaseInStructure* last_st = static_cast<VkBaseInStructure*>(head);
			while (last_st->pNext)
			{
				if (last_st->pNext == ptr)
					return;

				last_st = const_cast<VkBaseInStructure*>(last_st->pNext);
			}

			last_st->pNext = static_cast<const VkBaseInStructure*>(ptr);
		}

		const char* VkResultToString(VkResult res)
		{
			switch (res)
			{
				case VK_SUCCESS:
					return "VK_SUCCESS";

				case VK_NOT_READY:
					return "VK_NOT_READY";

				case VK_TIMEOUT:
					return "VK_TIMEOUT";

				case VK_EVENT_SET:
					return "VK_EVENT_SET";

				case VK_EVENT_RESET:
					return "VK_EVENT_RESET";

				case VK_INCOMPLETE:
					return "VK_INCOMPLETE";

				case VK_ERROR_OUT_OF_HOST_MEMORY:
					return "VK_ERROR_OUT_OF_HOST_MEMORY";

				case VK_ERROR_OUT_OF_DEVICE_MEMORY:
					return "VK_ERROR_OUT_OF_DEVICE_MEMORY";

				case VK_ERROR_INITIALIZATION_FAILED:
					return "VK_ERROR_INITIALIZATION_FAILED";

				case VK_ERROR_DEVICE_LOST:
					return "VK_ERROR_DEVICE_LOST";

				case VK_ERROR_MEMORY_MAP_FAILED:
					return "VK_ERROR_MEMORY_MAP_FAILED";

				case VK_ERROR_LAYER_NOT_PRESENT:
					return "VK_ERROR_LAYER_NOT_PRESENT";

				case VK_ERROR_EXTENSION_NOT_PRESENT:
					return "VK_ERROR_EXTENSION_NOT_PRESENT";

				case VK_ERROR_FEATURE_NOT_PRESENT:
					return "VK_ERROR_FEATURE_NOT_PRESENT";

				case VK_ERROR_INCOMPATIBLE_DRIVER:
					return "VK_ERROR_INCOMPATIBLE_DRIVER";

				case VK_ERROR_TOO_MANY_OBJECTS:
					return "VK_ERROR_TOO_MANY_OBJECTS";

				case VK_ERROR_FORMAT_NOT_SUPPORTED:
					return "VK_ERROR_FORMAT_NOT_SUPPORTED";

				case VK_ERROR_SURFACE_LOST_KHR:
					return "VK_ERROR_SURFACE_LOST_KHR";

				case VK_ERROR_NATIVE_WINDOW_IN_USE_KHR:
					return "VK_ERROR_NATIVE_WINDOW_IN_USE_KHR";

				case VK_SUBOPTIMAL_KHR:
					return "VK_SUBOPTIMAL_KHR";

				case VK_ERROR_OUT_OF_DATE_KHR:
					return "VK_ERROR_OUT_OF_DATE_KHR";

				case VK_ERROR_INCOMPATIBLE_DISPLAY_KHR:
					return "VK_ERROR_INCOMPATIBLE_DISPLAY_KHR";

				case VK_ERROR_VALIDATION_FAILED_EXT:
					return "VK_ERROR_VALIDATION_FAILED_EXT";

				case VK_ERROR_INVALID_SHADER_NV:
					return "VK_ERROR_INVALID_SHADER_NV";

				default:
					return "UNKNOWN_VK_RESULT";
			}
		}

		const char* PresentModeToString(VkPresentModeKHR mode)
		{
			switch (mode)
			{
				case VK_PRESENT_MODE_IMMEDIATE_KHR:
					return "VK_PRESENT_MODE_IMMEDIATE_KHR";

				case VK_PRESENT_MODE_MAILBOX_KHR:
					return "VK_PRESENT_MODE_MAILBOX_KHR";

				case VK_PRESENT_MODE_FIFO_KHR:
					return "VK_PRESENT_MODE_FIFO_KHR";

				case VK_PRESENT_MODE_FIFO_RELAXED_KHR:
					return "VK_PRESENT_MODE_FIFO_RELAXED_KHR";

				case VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR:
					return "VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR";

				case VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR:
					return "VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR";

				default:
					return "UNKNOWN_VK_PRESENT_MODE";
			}
		}

		void LogVulkanResult(const char* func_name, VkResult res, const char* msg, ...)
		{
			std::va_list ap;
			va_start(ap, msg);
			std::string real_msg = StringUtil::StdStringFromFormatV(msg, ap);
			va_end(ap);

			Console.Error(
				"(%s) %s (%d: %s)", func_name, real_msg.c_str(), static_cast<int>(res), VkResultToString(res));
		}
	} // namespace Util
} // namespace Vulkan