ppsspp/Common/GPU/Vulkan/VulkanRenderManager.h

#pragma once

// VulkanRenderManager takes the role that a GL driver does of sequencing and optimizing render passes.
// Only draws and binds are handled here, resource creation and allocations are handled as normal -
// that's the nice thing with Vulkan.

#include <atomic>
#include <condition_variable>
#include <cstdint>
#include <mutex>
#include <thread>

#include "Common/System/Display.h"
#include "Common/GPU/Vulkan/VulkanContext.h"
#include "Common/Data/Convert/SmallDataConvert.h"
#include "Common/Math/math_util.h"
#include "Common/GPU/DataFormat.h"
#include "Common/GPU/Vulkan/VulkanQueueRunner.h"

// Simple independent framebuffer image. Gets its own allocation, we don't have that many framebuffers so it's fine
// to let them have individual non-pooled allocations. Until it's not fine. We'll see.
struct VKRImage {
	// These four are "immutable".
	VkImage image;
	VkImageView imageView;
	VkImageView depthSampleView;
	VkDeviceMemory memory;
	VkFormat format;

	// This one is used by QueueRunner's Perform functions to keep track. CANNOT be used anywhere else due to sync issues.
	VkImageLayout layout;

	// For debugging.
	std::string tag;
};
void CreateImage(VulkanContext *vulkan, VkCommandBuffer cmd, VKRImage &img, int width, int height, VkFormat format, VkImageLayout initialLayout, bool color, const char *tag);

class VKRFramebuffer {
public:
	VKRFramebuffer(VulkanContext *vk, VkCommandBuffer initCmd, VkRenderPass renderPass, int _width, int _height, const char *tag);
	~VKRFramebuffer();

	int numShadows = 1;  // TODO: Support this.

	VkFramebuffer framebuf = VK_NULL_HANDLE;
	VKRImage color{};
	VKRImage depth{};
	int width = 0;
	int height = 0;

	VulkanContext *vulkan_;
	std::string tag;
};

enum class VKRRunType {
	END,
	SYNC,
};

enum {
	MAX_TIMESTAMP_QUERIES = 128,
};

class VulkanRenderManager {
public:
	VulkanRenderManager(VulkanContext *vulkan);
	~VulkanRenderManager();

	void ThreadFunc();

	// Makes sure that the GPU has caught up enough that we can start writing buffers of this frame again.
	void BeginFrame(bool enableProfiling);
	// Can run on a different thread!
	void Finish();
	void Run(int frame);

	// Zaps queued up commands. Use if you know there's a risk you've queued up stuff that has already been deleted. Can happen during in-game shutdown.
	void Wipe();

	// This starts a new step containing a render pass.
	//
	// After a "CopyFramebuffer" or the other functions that start "steps", you need to call this beforce
	// making any new render state changes or draw calls.
	//
	// The following dynamic state needs to be reset by the caller after calling this (and will thus not safely carry over from
	// the previous one):
	//   * Viewport/Scissor
	//   * Stencil parameters
	//   * Blend color
	//
	// (Most other state is directly decided by your choice of pipeline and descriptor set, so not handled here).
	//
	// It can be useful to use GetCurrentStepId() to figure out when you need to send all this state again, if you're
	// not keeping track of your calls to this function on your own.
	void BindFramebufferAsRenderTarget(VKRFramebuffer *fb, VKRRenderPassAction color, VKRRenderPassAction depth, VKRRenderPassAction stencil, uint32_t clearColor, float clearDepth, uint8_t clearStencil, const char *tag);

	// Returns an ImageView corresponding to a framebuffer. Is called BindFramebufferAsTexture to maintain a similar interface
	// as the other backends, even though there's no actual binding happening here.
	VkImageView BindFramebufferAsTexture(VKRFramebuffer *fb, int binding, VkImageAspectFlags aspectBits, int attachment);

	bool CopyFramebufferToMemorySync(VKRFramebuffer *src, VkImageAspectFlags aspectBits, int x, int y, int w, int h, Draw::DataFormat destFormat, uint8_t *pixels, int pixelStride, const char *tag);
	void CopyImageToMemorySync(VkImage image, int mipLevel, int x, int y, int w, int h, Draw::DataFormat destFormat, uint8_t *pixels, int pixelStride, const char *tag);

	void CopyFramebuffer(VKRFramebuffer *src, VkRect2D srcRect, VKRFramebuffer *dst, VkOffset2D dstPos, VkImageAspectFlags aspectMask, const char *tag);
	void BlitFramebuffer(VKRFramebuffer *src, VkRect2D srcRect, VKRFramebuffer *dst, VkRect2D dstRect, VkImageAspectFlags aspectMask, VkFilter filter, const char *tag);

	void BindPipeline(VkPipeline pipeline) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER);
		_dbg_assert_(pipeline != VK_NULL_HANDLE);
		VkRenderData data{ VKRRenderCommand::BIND_PIPELINE };
		data.pipeline.pipeline = pipeline;
		curRenderStep_->commands.push_back(data);
	}

	void SetViewport(const VkViewport &vp) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER);
		_dbg_assert_((int)vp.width >= 0);
		_dbg_assert_((int)vp.height >= 0);
		VkRenderData data{ VKRRenderCommand::VIEWPORT };
		data.viewport.vp.x = vp.x;
		data.viewport.vp.y = vp.y;
		data.viewport.vp.width = vp.width;
		data.viewport.vp.height = vp.height;
		// We can't allow values outside this range unless we use VK_EXT_depth_range_unrestricted.
		// Sometimes state mapping produces 65536/65535 which is slightly outside.
		// TODO: This should be fixed at the source.
		data.viewport.vp.minDepth = clamp_value(vp.minDepth, 0.0f, 1.0f);
		data.viewport.vp.maxDepth = clamp_value(vp.maxDepth, 0.0f, 1.0f);
		curRenderStep_->commands.push_back(data);
		curStepHasViewport_ = true;
	}

	void SetScissor(const VkRect2D &rc) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER);
		_dbg_assert_((int)rc.extent.width >= 0);
		_dbg_assert_((int)rc.extent.height >= 0);
		VkRenderData data{ VKRRenderCommand::SCISSOR };
		data.scissor.scissor = rc;
		curRenderStep_->commands.push_back(data);
		curStepHasScissor_ = true;
	}

	void SetStencilParams(uint8_t writeMask, uint8_t compareMask, uint8_t refValue) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER);
		VkRenderData data{ VKRRenderCommand::STENCIL };
		data.stencil.stencilWriteMask = writeMask;
		data.stencil.stencilCompareMask = compareMask;
		data.stencil.stencilRef = refValue;
		curRenderStep_->commands.push_back(data);
	}

	void SetBlendFactor(uint32_t color) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER);
		VkRenderData data{ VKRRenderCommand::BLEND };
		data.blendColor.color = color;
		curRenderStep_->commands.push_back(data);
	}

	void PushConstants(VkPipelineLayout pipelineLayout, VkShaderStageFlags stages, int offset, int size, void *constants) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER);
		_dbg_assert_(size + offset < 40);
		VkRenderData data{ VKRRenderCommand::PUSH_CONSTANTS };
		data.push.pipelineLayout = pipelineLayout;
		data.push.stages = stages;
		data.push.offset = offset;
		data.push.size = size;
		memcpy(data.push.data, constants, size);
		curRenderStep_->commands.push_back(data);
	}

	void Clear(uint32_t clearColor, float clearZ, int clearStencil, int clearMask);

	void Draw(VkPipelineLayout layout, VkDescriptorSet descSet, int numUboOffsets, const uint32_t *uboOffsets, VkBuffer vbuffer, int voffset, int count, int offset = 0) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER && curStepHasViewport_ && curStepHasScissor_);
		VkRenderData data{ VKRRenderCommand::DRAW };
		data.draw.count = count;
		data.draw.offset = offset;
		data.draw.pipelineLayout = layout;
		data.draw.ds = descSet;
		data.draw.vbuffer = vbuffer;
		data.draw.voffset = voffset;
		data.draw.numUboOffsets = numUboOffsets;
		_dbg_assert_(numUboOffsets <= ARRAY_SIZE(data.draw.uboOffsets));
		for (int i = 0; i < numUboOffsets; i++)
			data.draw.uboOffsets[i] = uboOffsets[i];
		curRenderStep_->commands.push_back(data);
		curRenderStep_->render.numDraws++;
	}

	void DrawIndexed(VkPipelineLayout layout, VkDescriptorSet descSet, int numUboOffsets, const uint32_t *uboOffsets, VkBuffer vbuffer, int voffset, VkBuffer ibuffer, int ioffset, int count, int numInstances, VkIndexType indexType) {
		_dbg_assert_(curRenderStep_ && curRenderStep_->stepType == VKRStepType::RENDER && curStepHasViewport_ && curStepHasScissor_);
		VkRenderData data{ VKRRenderCommand::DRAW_INDEXED };
		data.drawIndexed.count = count;
		data.drawIndexed.instances = numInstances;
		data.drawIndexed.pipelineLayout = layout;
		data.drawIndexed.ds = descSet;
		data.drawIndexed.vbuffer = vbuffer;
		data.drawIndexed.voffset = voffset;
		data.drawIndexed.ibuffer = ibuffer;
		data.drawIndexed.ioffset = ioffset;
		data.drawIndexed.numUboOffsets = numUboOffsets;
		_dbg_assert_(numUboOffsets <= ARRAY_SIZE(data.drawIndexed.uboOffsets));
		for (int i = 0; i < numUboOffsets; i++)
			data.drawIndexed.uboOffsets[i] = uboOffsets[i];
		data.drawIndexed.indexType = indexType;
		curRenderStep_->commands.push_back(data);
		curRenderStep_->render.numDraws++;
	}

	VkCommandBuffer GetInitCmd();

	VkRenderPass GetBackbufferRenderPass() {
		return queueRunner_.GetBackbufferRenderPass();
	}
	VkRenderPass GetFramebufferRenderPass() {
		return queueRunner_.GetFramebufferRenderPass();
	}
	VkRenderPass GetCompatibleRenderPass() {
		if (curRenderStep_ && curRenderStep_->render.framebuffer != nullptr) {
			return queueRunner_.GetFramebufferRenderPass();
		} else {
			return queueRunner_.GetBackbufferRenderPass();
		}
	}

	// Gets a frame-unique ID of the current step being recorded. Can be used to figure out
	// when the current step has changed, which means the caller will need to re-record its state.
	int GetCurrentStepId() const {
		return renderStepOffset_ + (int)steps_.size();
	}

	void CreateBackbuffers();
	void DestroyBackbuffers();

	bool HasBackbuffers() {
		return !framebuffers_.empty();
	}

	void SetSplitSubmit(bool split) {
		splitSubmit_ = split;
	}

	void SetInflightFrames(int f) {
		newInflightFrames_ = f < 1 || f > VulkanContext::MAX_INFLIGHT_FRAMES ? VulkanContext::MAX_INFLIGHT_FRAMES : f;
	}

	VulkanContext *GetVulkanContext() {
		return vulkan_;
	}

	// Be careful with this. Only meant to be used for fetching render passes for shader cache initialization.
	VulkanQueueRunner *GetQueueRunner() {
		return &queueRunner_;
	}

	std::string GetGpuProfileString() const {
		return frameData_[vulkan_->GetCurFrame()].profile.profileSummary;
	}

	bool NeedsSwapchainRecreate() const {
		// Accepting a few of these makes shutdown simpler.
		return outOfDateFrames_ > VulkanContext::MAX_INFLIGHT_FRAMES;
	}

private:
	bool InitBackbufferFramebuffers(int width, int height);
	bool InitDepthStencilBuffer(VkCommandBuffer cmd);  // Used for non-buffered rendering.
	void BeginSubmitFrame(int frame);
	void EndSubmitFrame(int frame);
	void Submit(int frame, bool triggerFence);

	// Bad for performance but sometimes necessary for synchronous CPU readbacks (screenshots and whatnot).
	void FlushSync();
	void EndSyncFrame(int frame);

	void StopThread();

	// Permanent objects
	VkSemaphore acquireSemaphore_;
	VkSemaphore renderingCompleteSemaphore_;

	// Per-frame data, round-robin so we can overlap submission with execution of the previous frame.
	struct FrameData {
		std::mutex push_mutex;
		std::condition_variable push_condVar;

		std::mutex pull_mutex;
		std::condition_variable pull_condVar;

		bool readyForFence = true;
		bool readyForRun = false;
		bool skipSwap = false;
		VKRRunType type = VKRRunType::END;

		VkFence fence;
		VkFence readbackFence;  // Strictly speaking we might only need one of these.
		bool readbackFenceUsed = false;

		// These are on different threads so need separate pools.
		VkCommandPool cmdPoolInit;
		VkCommandPool cmdPoolMain;
		VkCommandBuffer initCmd;
		VkCommandBuffer mainCmd;
		bool hasInitCommands = false;
		std::vector<VKRStep *> steps;

		// Swapchain.
		bool hasBegun = false;
		uint32_t curSwapchainImage = -1;

		// Profiling.
		QueueProfileContext profile;
		bool profilingEnabled_;
	};

	FrameData frameData_[VulkanContext::MAX_INFLIGHT_FRAMES];
	int newInflightFrames_ = -1;
	int inflightFramesAtStart_ = 0;

	int outOfDateFrames_ = 0;

	// Submission time state
	int curWidth_ = -1;
	int curHeight_ = -1;
	bool insideFrame_ = false;
	// This is the offset within this frame, in case of a mid-frame sync.
	int renderStepOffset_ = 0;
	VKRStep *curRenderStep_ = nullptr;
	bool curStepHasViewport_ = false;
	bool curStepHasScissor_ = false;
	std::vector<VKRStep *> steps_;
	bool splitSubmit_ = false;

	// Execution time state
	bool run_ = true;
	VulkanContext *vulkan_;
	std::thread thread_;
	std::mutex mutex_;
	int threadInitFrame_ = 0;
	VulkanQueueRunner queueRunner_;

	// Swap chain management
	struct SwapchainImageData {
		VkImage image;
		VkImageView view;
	};
	std::vector<VkFramebuffer> framebuffers_;
	std::vector<SwapchainImageData> swapchainImages_;
	uint32_t swapchainImageCount_ = 0;
	struct DepthBufferInfo {
		VkFormat format = VK_FORMAT_UNDEFINED;
		VkImage image = VK_NULL_HANDLE;
		VkDeviceMemory mem = VK_NULL_HANDLE;
		VkImageView view = VK_NULL_HANDLE;
	};
	DepthBufferInfo depth_;

	// This works great - except see issue #10097. WTF?
	bool useThread_ = true;
};