/*
    Created on: Nov 7, 2019

	Copyright 2019 flyinghead

	This file is part of Flycast.

    Flycast is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    Flycast 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 Flycast.  If not, see <https://www.gnu.org/licenses/>.
*/
#include <math.h>
#include "oit_drawer.h"
#include "hw/pvr/pvr_mem.h"

const vk::DeviceSize PixelBufferSize = 512 * 1024 * 1024;

// FIXME Code dup
TileClipping OITDrawer::SetTileClip(u32 val, vk::Rect2D& clipRect)
{
	if (!settings.rend.Clipping)
		return TileClipping::Off;

	u32 clipmode = val >> 28;
	if (clipmode < 2)
		return TileClipping::Off;	//always passes

	TileClipping tileClippingMode;
	if (clipmode & 1)
		tileClippingMode = TileClipping::Inside;   //render stuff outside the region
	else
		tileClippingMode = TileClipping::Outside;  //render stuff inside the region

	float csx = (float)(val & 63);
	float cex = (float)((val >> 6) & 63);
	float csy = (float)((val >> 12) & 31);
	float cey = (float)((val >> 17) & 31);
	csx = csx * 32;
	cex = cex * 32 + 32;
	csy = csy * 32;
	cey = cey * 32 + 32;

	if (csx <= 0 && csy <= 0 && cex >= 640 && cey >= 480)
		return TileClipping::Off;

	if (!pvrrc.isRTT)
	{
		glm::vec4 clip_start(csx, csy, 0, 1);
		glm::vec4 clip_end(cex, cey, 0, 1);
		clip_start = matrices.GetViewportMatrix() * clip_start;
		clip_end = matrices.GetViewportMatrix() * clip_end;

		csx = clip_start[0];
		csy = clip_start[1];
		cey = clip_end[1];
		cex = clip_end[0];
	}
	else if (!settings.rend.RenderToTextureBuffer)
	{
		csx *= settings.rend.RenderToTextureUpscale;
		csy *= settings.rend.RenderToTextureUpscale;
		cex *= settings.rend.RenderToTextureUpscale;
		cey *= settings.rend.RenderToTextureUpscale;
	}
	clipRect = vk::Rect2D(vk::Offset2D(std::max(0, (int)lroundf(csx)), std::max(0, (int)lroundf(csy))),
			vk::Extent2D(std::max(0, (int)lroundf(cex - csx)), std::max(0, (int)lroundf(cey - csy))));

	return tileClippingMode;
}

void OITDrawer::DrawPoly(const vk::CommandBuffer& cmdBuffer, u32 listType, bool autosort, int pass,
		const PolyParam& poly, u32 first, u32 count)
{
	vk::Rect2D scissorRect;
	TileClipping tileClip = SetTileClip(poly.tileclip, scissorRect);
	if (tileClip != TileClipping::Outside)
		scissorRect = baseScissor;
	SetScissor(cmdBuffer, scissorRect);

	float trilinearAlpha = 1.f;
	if (poly.tsp.FilterMode > 1 && poly.pcw.Texture && listType != ListType_Punch_Through)
	{
		trilinearAlpha = 0.25 * (poly.tsp.MipMapD & 0x3);
		if (poly.tsp.FilterMode == 2)
			// Trilinear pass A
			trilinearAlpha = 1.0 - trilinearAlpha;
	}

	bool twoVolumes = poly.tsp1.full != -1 || poly.tcw1.full != -1;

	OITDescriptorSets::PushConstants pushConstants = {
			{ (float)scissorRect.offset.x, (float)scissorRect.offset.y,
					(float)scissorRect.extent.width, (float)scissorRect.extent.height },
			{ getBlendFactor(poly.tsp.SrcInstr, true), getBlendFactor(poly.tsp.DstInstr, false), 0, 0 },
			trilinearAlpha,
			(int)(&poly - (listType == ListType_Opaque ? pvrrc.global_param_op.head()
					: listType == ListType_Punch_Through ? pvrrc.global_param_pt.head()
					: pvrrc.global_param_tr.head())),
	};
	if (twoVolumes)
	{
		pushConstants.blend_mode1 = { getBlendFactor(poly.tsp1.SrcInstr, true), getBlendFactor(poly.tsp1.DstInstr, false), 0, 0 };
		pushConstants.shading_instr0 = poly.tsp.ShadInstr;
		pushConstants.shading_instr1 = poly.tsp1.ShadInstr;
		pushConstants.fog_control0 = poly.tsp.FogCtrl;
		pushConstants.fog_control1 = poly.tsp1.FogCtrl;
		pushConstants.use_alpha0 = poly.tsp.UseAlpha;
		pushConstants.use_alpha1 = poly.tsp1.UseAlpha;
		pushConstants.ignore_tex_alpha0 = poly.tsp.IgnoreTexA;
		pushConstants.ignore_tex_alpha1 = poly.tsp1.IgnoreTexA;
	}
	cmdBuffer.pushConstants<OITDescriptorSets::PushConstants>(pipelineManager->GetPipelineLayout(), vk::ShaderStageFlagBits::eFragment, 0, pushConstants);

	if (poly.pcw.Texture)
		GetCurrentDescSet().SetTexture(poly.texid, poly.tsp, poly.texid1, poly.tsp1);

	vk::Pipeline pipeline = pipelineManager->GetPipeline(listType, autosort, poly, pass);
	cmdBuffer.bindPipeline(vk::PipelineBindPoint::eGraphics, pipeline);
	if (poly.pcw.Texture)
		GetCurrentDescSet().BindPerPolyDescriptorSets(cmdBuffer, poly.texid, poly.tsp, poly.texid1, poly.tsp1);

	cmdBuffer.drawIndexed(count, 1, first, 0, 0);
}

void OITDrawer::DrawList(const vk::CommandBuffer& cmdBuffer, u32 listType, bool sortTriangles, int pass,
		const List<PolyParam>& polys, u32 first, u32 last)
{
	for (u32 i = first; i < last; i++)
	{
		const PolyParam &pp = polys.head()[i];
		DrawPoly(cmdBuffer, listType, sortTriangles, pass, pp, pp.first, pp.count);
	}
}

template<bool Translucent>
void OITDrawer::DrawModifierVolumes(const vk::CommandBuffer& cmdBuffer, int first, int count)
{
	if (count == 0 || pvrrc.modtrig.used() == 0)
		return;

	vk::Buffer buffer = GetMainBuffer(0)->buffer.get();
	cmdBuffer.bindVertexBuffers(0, 1, &buffer, &offsets.modVolOffset);

	ModifierVolumeParam* params = Translucent ? &pvrrc.global_param_mvo_tr.head()[first] : &pvrrc.global_param_mvo.head()[first];

	// TODO glMemoryBarrier(GL_SHADER_IMAGE_ACCESS_BARRIER_BIT | GL_BUFFER_UPDATE_BARRIER_BIT);

	int mod_base = -1;
	vk::Pipeline pipeline;

	for (u32 cmv = 0; cmv < count; cmv++)
	{
		ModifierVolumeParam& param = params[cmv];

		if (param.count == 0)
			continue;

		u32 mv_mode = param.isp.DepthMode;

		verify(param.first >= 0 && param.first + param.count <= pvrrc.modtrig.used());

		if (mod_base == -1)
			mod_base = param.first;

		if (!param.isp.VolumeLast && mv_mode > 0)
		{
			// OR'ing (open volume or quad)
			if (Translucent)
				pipeline = pipelineManager->GetTrModifierVolumePipeline(ModVolMode::Or);
			else
				pipeline = pipelineManager->GetModifierVolumePipeline(ModVolMode::Or);
		}
		else
		{
			// XOR'ing (closed volume)
			if (Translucent)
				pipeline = pipelineManager->GetTrModifierVolumePipeline(ModVolMode::Xor);
			else
				pipeline = pipelineManager->GetModifierVolumePipeline(ModVolMode::Xor);
		}
		cmdBuffer.bindPipeline(vk::PipelineBindPoint::eGraphics, pipeline);
		cmdBuffer.draw(param.count * 3, 1, param.first * 3, 0);

		// TODO glMemoryBarrier(GL_BUFFER_UPDATE_BARRIER_BIT);

		if (mv_mode == 1 || mv_mode == 2)
		{
			//Sum the area
			if (Translucent)
				pipeline = pipelineManager->GetTrModifierVolumePipeline(mv_mode == 1 ? ModVolMode::Inclusion : ModVolMode::Exclusion);
			else
				pipeline = pipelineManager->GetModifierVolumePipeline(mv_mode == 1 ? ModVolMode::Inclusion : ModVolMode::Exclusion);
			cmdBuffer.bindPipeline(vk::PipelineBindPoint::eGraphics, pipeline);
			cmdBuffer.draw((param.first + param.count - mod_base) * 3, 1, mod_base * 3, 0);

			// TODO glMemoryBarrier(GL_BUFFER_UPDATE_BARRIER_BIT);
			mod_base = -1;
		}
	}
	const vk::DeviceSize offset = 0;
	cmdBuffer.bindVertexBuffers(0, 1, &buffer, &offset);
}

void OITDrawer::UploadMainBuffer(const OITDescriptorSets::VertexShaderUniforms& vertexUniforms,
		const OITDescriptorSets::FragmentShaderUniforms& fragmentUniforms)
{
	using VertexShaderUniforms = OITDescriptorSets::VertexShaderUniforms;
	using FragmentShaderUniforms = OITDescriptorSets::FragmentShaderUniforms;

	// TODO Put this logic in an allocator
	std::vector<const void *> chunks;
	std::vector<u32> chunkSizes;

	// Vertex
	chunks.push_back(pvrrc.verts.head());
	chunkSizes.push_back(pvrrc.verts.bytes());

	u32 padding = align(pvrrc.verts.bytes(), 4);
	offsets.modVolOffset = pvrrc.verts.bytes() + padding;
	chunks.push_back(nullptr);
	chunkSizes.push_back(padding);

	// Modifier Volumes
	chunks.push_back(pvrrc.modtrig.head());
	chunkSizes.push_back(pvrrc.modtrig.bytes());
	padding = align(offsets.modVolOffset + pvrrc.modtrig.bytes(), 4);
	offsets.indexOffset = offsets.modVolOffset + pvrrc.modtrig.bytes() + padding;
	chunks.push_back(nullptr);
	chunkSizes.push_back(padding);

	// Index
	chunks.push_back(pvrrc.idx.head());
	chunkSizes.push_back(pvrrc.idx.bytes());

	// Uniform buffers
	u32 indexSize = pvrrc.idx.bytes();
	padding = align(offsets.indexOffset + indexSize, std::max(4, (int)GetContext()->GetUniformBufferAlignment()));
	offsets.vertexUniformOffset = offsets.indexOffset + indexSize + padding;
	chunks.push_back(nullptr);
	chunkSizes.push_back(padding);

	chunks.push_back(&vertexUniforms);
	chunkSizes.push_back(sizeof(vertexUniforms));
	padding = align(offsets.vertexUniformOffset + sizeof(VertexShaderUniforms), std::max(4, (int)GetContext()->GetUniformBufferAlignment()));
	offsets.fragmentUniformOffset = offsets.vertexUniformOffset + sizeof(VertexShaderUniforms) + padding;
	chunks.push_back(nullptr);
	chunkSizes.push_back(padding);

	chunks.push_back(&fragmentUniforms);
	chunkSizes.push_back(sizeof(fragmentUniforms));

	// Translucent poly params
	padding = align(offsets.fragmentUniformOffset + sizeof(FragmentShaderUniforms), std::max(4, (int)GetContext()->GetStorageBufferAlignment()));
	offsets.polyParamsOffset = offsets.fragmentUniformOffset + sizeof(FragmentShaderUniforms) + padding;
	chunks.push_back(nullptr);
	chunkSizes.push_back(padding);

	chunks.push_back(pvrrc.global_param_tr.head());
	chunkSizes.push_back(pvrrc.global_param_tr.bytes());
	u32 totalSize = offsets.polyParamsOffset + pvrrc.global_param_tr.bytes();

	BufferData *buffer = GetMainBuffer(totalSize);
	buffer->upload(chunks.size(), &chunkSizes[0], &chunks[0]);
}

bool OITDrawer::Draw(const Texture *fogTexture)
{
	extern bool fog_needs_update;

	OITDescriptorSets::VertexShaderUniforms vtxUniforms;
	vtxUniforms.normal_matrix = matrices.GetNormalMatrix();

	OITDescriptorSets::FragmentShaderUniforms fragUniforms;
	fragUniforms.extra_depth_scale = settings.rend.ExtraDepthScale;

	//VERT and RAM fog color constants
	u8* fog_colvert_bgra=(u8*)&FOG_COL_VERT;
	u8* fog_colram_bgra=(u8*)&FOG_COL_RAM;
	fragUniforms.sp_FOG_COL_VERT[0]=fog_colvert_bgra[2]/255.0f;
	fragUniforms.sp_FOG_COL_VERT[1]=fog_colvert_bgra[1]/255.0f;
	fragUniforms.sp_FOG_COL_VERT[2]=fog_colvert_bgra[0]/255.0f;

	fragUniforms.sp_FOG_COL_RAM[0]=fog_colram_bgra [2]/255.0f;
	fragUniforms.sp_FOG_COL_RAM[1]=fog_colram_bgra [1]/255.0f;
	fragUniforms.sp_FOG_COL_RAM[2]=fog_colram_bgra [0]/255.0f;

	//Fog density constant
	u8* fog_density=(u8*)&FOG_DENSITY;
	float fog_den_mant=fog_density[1]/128.0f;  //bit 7 -> x. bit, so [6:0] -> fraction -> /128
	s32 fog_den_exp=(s8)fog_density[0];
	fragUniforms.sp_FOG_DENSITY = fog_den_mant * powf(2.0f, fog_den_exp);

	fragUniforms.colorClampMin[0] = ((pvrrc.fog_clamp_min >> 16) & 0xFF) / 255.0f;
	fragUniforms.colorClampMin[1] = ((pvrrc.fog_clamp_min >> 8) & 0xFF) / 255.0f;
	fragUniforms.colorClampMin[2] = ((pvrrc.fog_clamp_min >> 0) & 0xFF) / 255.0f;
	fragUniforms.colorClampMin[3] = ((pvrrc.fog_clamp_min >> 24) & 0xFF) / 255.0f;

	fragUniforms.colorClampMax[0] = ((pvrrc.fog_clamp_max >> 16) & 0xFF) / 255.0f;
	fragUniforms.colorClampMax[1] = ((pvrrc.fog_clamp_max >> 8) & 0xFF) / 255.0f;
	fragUniforms.colorClampMax[2] = ((pvrrc.fog_clamp_max >> 0) & 0xFF) / 255.0f;
	fragUniforms.colorClampMax[3] = ((pvrrc.fog_clamp_max >> 24) & 0xFF) / 255.0f;

	fragUniforms.cp_AlphaTestValue = (PT_ALPHA_REF & 0xFF) / 255.0f;
	fragUniforms.shade_scale_factor = FPU_SHAD_SCALE.scale_factor / 256.f;

	currentScissor = vk::Rect2D();

	vk::CommandBuffer cmdBuffer = BeginRenderPass();

	// Upload vertex and index buffers
	UploadMainBuffer(vtxUniforms, fragUniforms);

	quadBuffer->Update();

	// Update per-frame descriptor set and bind it
	GetCurrentDescSet().UpdateUniforms(GetMainBuffer(0)->buffer.get(), offsets.vertexUniformOffset, offsets.fragmentUniformOffset,
			fogTexture->GetImageView(), pixelBuffer->buffer.get(), PixelBufferSize, pixelCounter->buffer.get(), offsets.polyParamsOffset,
			pvrrc.global_param_tr.bytes(), abufferPointerAttachment->GetImageView());
	GetCurrentDescSet().BindPerFrameDescriptorSets(cmdBuffer);
	// Reset per-poly descriptor set pool
	GetCurrentDescSet().Reset();

	RenderPass previous_pass = {};
    for (int render_pass = 0; render_pass < pvrrc.render_passes.used(); render_pass++)
    {
        const RenderPass& current_pass = pvrrc.render_passes.head()[render_pass];

        DEBUG_LOG(RENDERER, "Render pass %d OP %d PT %d TR %d MV %d autosort %d", render_pass + 1,
        		current_pass.op_count - previous_pass.op_count,
				current_pass.pt_count - previous_pass.pt_count,
				current_pass.tr_count - previous_pass.tr_count,
				current_pass.mvo_count - previous_pass.mvo_count, current_pass.autosort);
    	// Bind vertex and index buffers
    	const vk::DeviceSize zeroOffset[] = { 0 };
    	const vk::Buffer buffer = GetMainBuffer(0)->buffer.get();
    	cmdBuffer.bindVertexBuffers(0, 1, &buffer, zeroOffset);
    	cmdBuffer.bindIndexBuffer(buffer, offsets.indexOffset, vk::IndexType::eUint32);

        // Depth + stencil subpass
		DrawList(cmdBuffer, ListType_Opaque, false, 0, pvrrc.global_param_op, previous_pass.op_count, current_pass.op_count);
		DrawList(cmdBuffer, ListType_Punch_Through, false, 0, pvrrc.global_param_pt, previous_pass.pt_count, current_pass.pt_count);

		DrawModifierVolumes<false>(cmdBuffer, previous_pass.mvo_count, current_pass.mvo_count - previous_pass.mvo_count);

		// Color subpass
		cmdBuffer.nextSubpass(vk::SubpassContents::eInline);
		GetCurrentDescSet().UpdatePass1Uniforms(depthAttachment->GetStencilView(), depthAttachment->GetImageView());
		GetCurrentDescSet().BindPass1DescriptorSets(cmdBuffer);

		// OP + PT
		DrawList(cmdBuffer, ListType_Opaque, false, 1, pvrrc.global_param_op, previous_pass.op_count, current_pass.op_count);
		DrawList(cmdBuffer, ListType_Punch_Through, false, 1, pvrrc.global_param_pt, previous_pass.pt_count, current_pass.pt_count);

		// TR
		DrawList(cmdBuffer, ListType_Translucent, current_pass.autosort, 3, pvrrc.global_param_tr, previous_pass.tr_count, current_pass.tr_count);

		// Final subpass
		cmdBuffer.nextSubpass(vk::SubpassContents::eInline);
		GetCurrentDescSet().UpdatePass2Uniforms(color1Attachment->GetImageView());
		GetCurrentDescSet().BindPass2DescriptorSets(cmdBuffer);

		// Tr modifier volumes
		DrawModifierVolumes<true>(cmdBuffer, previous_pass.mvo_tr_count, current_pass.mvo_tr_count - previous_pass.mvo_tr_count);

		vk::Pipeline pipeline = pipelineManager->GetFinalPipeline(current_pass.autosort);
		cmdBuffer.bindPipeline(vk::PipelineBindPoint::eGraphics, pipeline);
		quadBuffer->Bind(cmdBuffer);
		quadBuffer->Draw(cmdBuffer);

		// Clear
/*
		vk::ImageMemoryBarrier imageMemoryBarrier(
				vk::AccessFlagBits::eShaderRead,
				vk::AccessFlagBits::eShaderWrite,
				vk::ImageLayout::eGeneral,
				vk::ImageLayout::eGeneral,
				VK_QUEUE_FAMILY_IGNORED,
				VK_QUEUE_FAMILY_IGNORED,
				abufferPointerAttachment->GetImage(),
				vk::ImageSubresourceRange(vk::ImageAspectFlagBits::eColor));
		cmdBuffer.pipelineBarrier(vk::PipelineStageFlagBits::eFragmentShader, vk::PipelineStageFlagBits::eFragmentShader,
				vk::DependencyFlagBits::eByRegion, 0, nullptr, 0, nullptr, 1, &imageMemoryBarrier);
*/
		vk::MemoryBarrier memoryBarrier(vk::AccessFlagBits::eShaderRead, vk::AccessFlagBits::eShaderWrite);
		cmdBuffer.pipelineBarrier(vk::PipelineStageFlagBits::eFragmentShader, vk::PipelineStageFlagBits::eFragmentShader,
				vk::DependencyFlagBits::eByRegion, 1, &memoryBarrier, 0, nullptr, 0, nullptr);
		pipeline = pipelineManager->GetClearPipeline();
		cmdBuffer.bindPipeline(vk::PipelineBindPoint::eGraphics, pipeline);
		quadBuffer->Draw(cmdBuffer);

		previous_pass = current_pass;
    }

	return !pvrrc.isRTT;
}

void OITDrawer::MakeBuffers(int width, int height)
{
	pixelBuffer = std::unique_ptr<BufferData>(new BufferData(GetContext()->GetPhysicalDevice(), GetContext()->GetDevice(), PixelBufferSize,
			vk::BufferUsageFlagBits::eStorageBuffer, &SimpleAllocator::instance, vk::MemoryPropertyFlagBits::eDeviceLocal));
	pixelCounter = std::unique_ptr<BufferData>(new BufferData(GetContext()->GetPhysicalDevice(), GetContext()->GetDevice(), 4,
			vk::BufferUsageFlagBits::eStorageBuffer | vk::BufferUsageFlagBits::eTransferDst, allocator, vk::MemoryPropertyFlagBits::eDeviceLocal));
	pixelCounterReset = std::unique_ptr<BufferData>(new BufferData(GetContext()->GetPhysicalDevice(), GetContext()->GetDevice(), 4,
			vk::BufferUsageFlagBits::eTransferSrc, allocator));
	const int zero = 0;
	pixelCounterReset->upload(sizeof(zero), &zero);
	abufferPointerAttachment = std::unique_ptr<FramebufferAttachment>(new FramebufferAttachment(GetContext()->GetPhysicalDevice(), GetContext()->GetDevice(),
			allocator));
	abufferPointerAttachment->Init(width, height, vk::Format::eR32Uint, vk::ImageUsageFlagBits::eStorage);
	abufferPointerTransitionNeeded = true;
}

void OITDrawer::MakeAttachments(int width, int height)
{
	color1Attachment = std::unique_ptr<FramebufferAttachment>(new FramebufferAttachment(GetContext()->GetPhysicalDevice(),
			GetContext()->GetDevice(), allocator));
	color1Attachment->Init(width, height, GetContext()->GetColorFormat(), vk::ImageUsageFlagBits::eInputAttachment);

	color2Attachment = std::unique_ptr<FramebufferAttachment>(new FramebufferAttachment(GetContext()->GetPhysicalDevice(),
			GetContext()->GetDevice(), allocator));
	color2Attachment->Init(width, height, GetContext()->GetColorFormat(), vk::ImageUsageFlagBits::eInputAttachment);

	depthAttachment = std::unique_ptr<FramebufferAttachment>(new FramebufferAttachment(GetContext()->GetPhysicalDevice(),
				GetContext()->GetDevice(), allocator));
	depthAttachment->Init(width, height, GetContext()->GetDepthFormat(), vk::ImageUsageFlagBits::eInputAttachment);

	printf("color attachment %p depth %p\n", (VkImage)color1Attachment->GetImage(), (VkImage)depthAttachment->GetImage());
}

void OITDrawer::MakeFramebuffers(int width, int height)
{
	vk::ImageView attachments[] = {
			nullptr,	// swap chain image view, set later
			color1Attachment->GetImageView(),
			depthAttachment->GetImageView(),
	};
	framebuffers.reserve(GetContext()->GetSwapChainSize());
	for (int i = 0; i < GetContext()->GetSwapChainSize(); i++)
	{
		vk::FramebufferCreateInfo createInfo(vk::FramebufferCreateFlags(), pipelineManager->GetRenderPass(),
				ARRAY_SIZE(attachments), attachments, width, height, 1);
		attachments[0] = GetContext()->GetSwapChainImageView(i);
		framebuffers.push_back(GetContext()->GetDevice().createFramebufferUnique(createInfo));
	}
}

vk::CommandBuffer OITTextureDrawer::BeginRenderPass()
{
	DEBUG_LOG(RENDERER, "RenderToTexture packmode=%d stride=%d - %d,%d -> %d,%d", FB_W_CTRL.fb_packmode, FB_W_LINESTRIDE.stride * 8,
			FB_X_CLIP.min, FB_Y_CLIP.min, FB_X_CLIP.max, FB_Y_CLIP.max);
	matrices.CalcMatrices(&pvrrc);

	textureAddr = FB_W_SOF1 & VRAM_MASK;
	u32 origWidth = pvrrc.fb_X_CLIP.max - pvrrc.fb_X_CLIP.min + 1;
	u32 origHeight = pvrrc.fb_Y_CLIP.max - pvrrc.fb_Y_CLIP.min + 1;
	u32 upscaledWidth = origWidth;
	u32 upscaledHeight = origHeight;
	int heightPow2 = 2;
	while (heightPow2 < upscaledHeight)
		heightPow2 *= 2;
	int widthPow2 = 2;
	while (widthPow2 < upscaledWidth)
		widthPow2 *= 2;

	if (settings.rend.RenderToTextureUpscale > 1 && !settings.rend.RenderToTextureBuffer)
	{
		upscaledWidth *= settings.rend.RenderToTextureUpscale;
		upscaledHeight *= settings.rend.RenderToTextureUpscale;
		widthPow2 *= settings.rend.RenderToTextureUpscale;
		heightPow2 *= settings.rend.RenderToTextureUpscale;
	}

	static_cast<RttOITPipelineManager*>(pipelineManager)->CheckSettingsChange();
	VulkanContext *context = GetContext();
	vk::Device device = context->GetDevice();

	vk::CommandBuffer commandBuffer = commandPool->Allocate();
	commandBuffer.begin(vk::CommandBufferBeginInfo(vk::CommandBufferUsageFlagBits::eOneTimeSubmit));

	if (widthPow2 != this->width || heightPow2 != this->height || !depthAttachment)
	{
		if (!depthAttachment)
			depthAttachment = std::unique_ptr<FramebufferAttachment>(new FramebufferAttachment(context->GetPhysicalDevice(), device, allocator));
		depthAttachment->Init(widthPow2, heightPow2, GetContext()->GetDepthFormat());
	}
	vk::ImageView colorImageView;
	vk::ImageLayout colorImageCurrentLayout;

	if (!settings.rend.RenderToTextureBuffer)
	{
		// TexAddr : fb_rtt.TexAddr, Reserved : 0, StrideSel : 0, ScanOrder : 1
		TCW tcw = { { textureAddr >> 3, 0, 0, 1 } };
		switch (FB_W_CTRL.fb_packmode) {
		case 0:
		case 3:
			tcw.PixelFmt = Pixel1555;
			break;
		case 1:
			tcw.PixelFmt = Pixel565;
			break;
		case 2:
			tcw.PixelFmt = Pixel4444;
			break;
		}

		TSP tsp = { 0 };
		for (tsp.TexU = 0; tsp.TexU <= 7 && (8 << tsp.TexU) < origWidth; tsp.TexU++);
		for (tsp.TexV = 0; tsp.TexV <= 7 && (8 << tsp.TexV) < origHeight; tsp.TexV++);

		texture = textureCache->getTextureCacheData(tsp, tcw);
		if (texture->IsNew())
		{
			texture->Create();
			texture->SetAllocator(allocator);
			texture->SetPhysicalDevice(GetContext()->GetPhysicalDevice());
			texture->SetDevice(device);
		}
		if (texture->format != vk::Format::eR8G8B8A8Unorm)
		{
			texture->extent = vk::Extent2D(widthPow2, heightPow2);
			texture->format = vk::Format::eR8G8B8A8Unorm;
			texture->CreateImage(vk::ImageTiling::eOptimal, vk::ImageUsageFlagBits::eColorAttachment | vk::ImageUsageFlagBits::eSampled,
					vk::ImageLayout::eUndefined, vk::MemoryPropertyFlags(), vk::ImageAspectFlagBits::eColor);
			colorImageCurrentLayout = vk::ImageLayout::eUndefined;
		}
		else
		{
			colorImageCurrentLayout = vk::ImageLayout::eShaderReadOnlyOptimal;
		}
		colorImage = *texture->image;
		colorImageView = texture->GetImageView();
	}
	else
	{
		if (widthPow2 != this->width || heightPow2 != this->height || !colorAttachment)
		{
			if (!colorAttachment)
			{
				colorAttachment = std::unique_ptr<FramebufferAttachment>(new FramebufferAttachment(context->GetPhysicalDevice(),
						device, allocator));
			}
			colorAttachment->Init(widthPow2, heightPow2, vk::Format::eR8G8B8A8Unorm);
		}
		colorImage = colorAttachment->GetImage();
		colorImageView = colorAttachment->GetImageView();
		colorImageCurrentLayout = vk::ImageLayout::eUndefined;
	}
	width = widthPow2;
	height = heightPow2;

	setImageLayout(commandBuffer, colorImage, vk::Format::eR8G8B8A8Unorm, 1, colorImageCurrentLayout, vk::ImageLayout::eColorAttachmentOptimal);

	vk::ImageView imageViews[] = {
		colorImageView,
		depthAttachment->GetImageView(),
	};
	framebuffer = device.createFramebufferUnique(vk::FramebufferCreateInfo(vk::FramebufferCreateFlags(),
			pipelineManager->GetRenderPass(), ARRAY_SIZE(imageViews), imageViews, widthPow2, heightPow2, 1));

	const vk::ClearValue clear_colors[] = { vk::ClearColorValue(std::array<float, 4> { 0.f, 0.f, 0.f, 1.f }), vk::ClearDepthStencilValue { 0.f, 0 } };
	commandBuffer.beginRenderPass(vk::RenderPassBeginInfo(pipelineManager->GetRenderPass(),	*framebuffer,
			vk::Rect2D( { 0, 0 }, { width, height }), 2, clear_colors), vk::SubpassContents::eInline);
	commandBuffer.setViewport(0, vk::Viewport(0.0f, 0.0f, (float)upscaledWidth, (float)upscaledHeight, 1.0f, 0.0f));
	baseScissor = vk::Rect2D(vk::Offset2D(0, 0), vk::Extent2D(upscaledWidth, upscaledHeight));
	commandBuffer.setScissor(0, baseScissor);
	currentCommandBuffer = commandBuffer;

	return commandBuffer;
}

void OITTextureDrawer::EndRenderPass()
{
	currentCommandBuffer.endRenderPass();

	if (settings.rend.RenderToTextureBuffer)
	{
		vk::BufferImageCopy copyRegion(0, width, height, vk::ImageSubresourceLayers(vk::ImageAspectFlagBits::eColor, 0, 0, 1), vk::Offset3D(0, 0, 0),
				vk::Extent3D(vk::Extent2D(width, height), 1));
		currentCommandBuffer.copyImageToBuffer(colorAttachment->GetImage(), vk::ImageLayout::eTransferSrcOptimal,
				*colorAttachment->GetBufferData()->buffer, copyRegion);

		vk::BufferMemoryBarrier bufferMemoryBarrier(
				vk::AccessFlagBits::eTransferWrite,
				vk::AccessFlagBits::eHostRead,
				VK_QUEUE_FAMILY_IGNORED,
				VK_QUEUE_FAMILY_IGNORED,
				*colorAttachment->GetBufferData()->buffer,
				0,
				VK_WHOLE_SIZE);
		currentCommandBuffer.pipelineBarrier(vk::PipelineStageFlagBits::eTransfer,
						vk::PipelineStageFlagBits::eHost, {}, nullptr, bufferMemoryBarrier, nullptr);
	}
	currentCommandBuffer.end();

	GetContext()->GetGraphicsQueue().submit(vk::SubmitInfo(0, nullptr, nullptr, 1, &currentCommandBuffer),
			settings.rend.RenderToTextureBuffer ? *fence : nullptr);
	colorImage = nullptr;
	currentCommandBuffer = nullptr;
	commandPool->EndFrame();



	if (settings.rend.RenderToTextureBuffer)
	{
		GetContext()->GetDevice().waitForFences(1, &fence.get(), true, UINT64_MAX);
		GetContext()->GetDevice().resetFences(1, &fence.get());

		u16 *dst = (u16 *)&vram[textureAddr];

		PixelBuffer<u32> tmpBuf;
		tmpBuf.init(width, height);
		colorAttachment->GetBufferData()->download(GetContext()->GetDevice(), width * height * 4, tmpBuf.data());
		WriteTextureToVRam(width, height, (u8 *)tmpBuf.data(), dst);

		return;
	}
	//memset(&vram[fb_rtt.TexAddr << 3], '\0', size);

	texture->dirty = 0;
	if (texture->lock_block == NULL)
		texture->lock_block = libCore_vramlock_Lock(texture->sa_tex, texture->sa + texture->size - 1, texture);
}

vk::CommandBuffer OITScreenDrawer::BeginRenderPass()
{
	GetContext()->NewFrame();
	vk::CommandBuffer commandBuffer = GetContext()->GetCurrentCommandBuffer();

	// FIXME this needs to go in the parent class
	if (abufferPointerTransitionNeeded)
	{
		abufferPointerTransitionNeeded = false;

		vk::ImageSubresourceRange imageSubresourceRange(vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1);
		vk::ImageMemoryBarrier imageMemoryBarrier(vk::AccessFlags(), vk::AccessFlagBits::eShaderRead | vk::AccessFlagBits::eShaderWrite,
				vk::ImageLayout::eUndefined, vk::ImageLayout::eGeneral, VK_QUEUE_FAMILY_IGNORED, VK_QUEUE_FAMILY_IGNORED,
				abufferPointerAttachment->GetImage(), imageSubresourceRange);
		commandBuffer.pipelineBarrier(vk::PipelineStageFlagBits::eTopOfPipe, vk::PipelineStageFlagBits::eFragmentShader, {}, nullptr, nullptr,
				imageMemoryBarrier);
	}
	// FIXME this must be done for each continuation
	vk::BufferCopy copy(0, 0, sizeof(int));
	commandBuffer.copyBuffer(*pixelCounterReset->buffer, *pixelCounter->buffer, 1, &copy);


	vk::Extent2D viewport = GetContext()->GetViewPort();
	const vk::ClearValue clear_colors[] = {
			vk::ClearColorValue(std::array<float, 4>{0.f, 0.f, 0.f, 1.f}),
			vk::ClearColorValue(std::array<float, 4>{0.f, 0.f, 0.f, 1.f}),
			vk::ClearDepthStencilValue{ 0.f, 0 },
			vk::ClearDepthStencilValue{ 0.f, 0 },
	};
	commandBuffer.beginRenderPass(
			vk::RenderPassBeginInfo(pipelineManager->GetRenderPass(), *framebuffers[GetContext()->GetCurrentImageIndex()],
					vk::Rect2D({0, 0}, {viewport.width, viewport.height}), ARRAY_SIZE(clear_colors), clear_colors),
			vk::SubpassContents::eInline);

	commandBuffer.setViewport(0, vk::Viewport(0.0f, 0.0f, (float)screen_width, (float)screen_height, 1.0f, 0.0f));

	matrices.CalcMatrices(&pvrrc);

	bool wide_screen_on = settings.rend.WideScreen && !pvrrc.isRenderFramebuffer && !matrices.IsClipped();

	if (!wide_screen_on)
	{
		float width;
		float height;
		float min_x;
		float min_y;

		if (pvrrc.isRenderFramebuffer)
		{
			width = 640;
			height = 480;
			min_x = 0;
			min_y = 0;
		}
		else
		{
			glm::vec4 clip_min(pvrrc.fb_X_CLIP.min, pvrrc.fb_Y_CLIP.min, 0, 1);
			glm::vec4 clip_dim(pvrrc.fb_X_CLIP.max - pvrrc.fb_X_CLIP.min + 1,
							   pvrrc.fb_Y_CLIP.max - pvrrc.fb_Y_CLIP.min + 1, 0, 0);
			clip_min = matrices.GetScissorMatrix() * clip_min;
			clip_dim = matrices.GetScissorMatrix() * clip_dim;

			min_x = clip_min[0];
			min_y = clip_min[1];
			width = clip_dim[0];
			height = clip_dim[1];
			if (width < 0)
			{
				min_x += width;
				width = -width;
			}
			if (height < 0)
			{
				min_y += height;
				height = -height;
			}
		}

		baseScissor = vk::Rect2D(
				vk::Offset2D((u32)std::max(lroundf(min_x), 0L), (u32)std::max(lroundf(min_y), 0L)),
				vk::Extent2D((u32)std::max(lroundf(width), 0L), (u32)std::max(lroundf(height), 0L)));
	}
	else
	{
		baseScissor = vk::Rect2D(vk::Offset2D(0, 0), vk::Extent2D(screen_width, screen_height));
	}

	commandBuffer.setScissor(0, baseScissor);
	return commandBuffer;
}