imgui_impl_dx11.cpp

// dear imgui: Renderer for DirectX11
// This needs to be used along with a Platform Binding (e.g. Win32)

// Implemented features:
//  [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
//  [X] Renderer: Support for large meshes (64k+ vertices) with 16-bits indices.

// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp
// https://github.com/ocornut/imgui

// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
//  2019-07-21: DirectX11: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData. Clearing Hull/Domain/Compute shaders without backup/restore.
//  2019-05-29: DirectX11: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
//  2019-04-30: DirectX11: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
//  2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
//  2018-08-01: DirectX11: Querying for IDXGIFactory instead of IDXGIFactory1 to increase compatibility.
//  2018-07-13: DirectX11: Fixed unreleased resources in Init and Shutdown functions.
//  2018-06-08: Misc: Extracted imgui_impl_dx11.cpp/.h away from the old combined DX11+Win32 example.
//  2018-06-08: DirectX11: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX11_RenderDrawData() in the .h file so you can call it yourself.
//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
//  2016-05-07: DirectX11: Disabling depth-write.

#include "imgui.h"
#include "imgui_impl_dx11.h"

// DirectX
#include <stdio.h>
#include <d3d11.h>
#include <d3dcompiler.h>
#ifdef _MSC_VER
#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
#endif

// DirectX data
static ID3D11Device* g_pd3dDevice = NULL;
static ID3D11DeviceContext* g_pd3dDeviceContext = NULL;
static IDXGIFactory* g_pFactory = NULL;
static ID3D11Buffer* g_pVB = NULL;
static ID3D11Buffer* g_pIB = NULL;
static ID3D10Blob* g_pVertexShaderBlob = NULL;
static ID3D11VertexShader* g_pVertexShader = NULL;
static ID3D11InputLayout* g_pInputLayout = NULL;
static ID3D11Buffer* g_pVertexConstantBuffer = NULL;
static ID3D10Blob* g_pPixelShaderBlob = NULL;
static ID3D11PixelShader* g_pPixelShader = NULL;
static ID3D11SamplerState* g_pFontSampler = NULL;
static ID3D11ShaderResourceView* g_pFontTextureView = NULL;
static ID3D11RasterizerState* g_pRasterizerState = NULL;
static ID3D11BlendState* g_pBlendState = NULL;
static ID3D11DepthStencilState* g_pDepthStencilState = NULL;
static int                      g_VertexBufferSize = 5000, g_IndexBufferSize = 10000;

struct VERTEX_CONSTANT_BUFFER
{
	float   mvp[4][4];
};

static void ImGui_ImplDX11_SetupRenderState(ImDrawData* draw_data, ID3D11DeviceContext* ctx)
{
	// Setup viewport
	D3D11_VIEWPORT vp;
	memset(&vp, 0, sizeof(D3D11_VIEWPORT));
	vp.Width = draw_data->DisplaySize.x;
	vp.Height = draw_data->DisplaySize.y;
	vp.MinDepth = 0.0f;
	vp.MaxDepth = 1.0f;
	vp.TopLeftX = vp.TopLeftY = 0;
	ctx->RSSetViewports(1, &vp);

	// Setup shader and vertex buffers
	unsigned int stride = sizeof(ImDrawVert);
	unsigned int offset = 0;
	ctx->IASetInputLayout(g_pInputLayout);
	ctx->IASetVertexBuffers(0, 1, &g_pVB, &stride, &offset);
	ctx->IASetIndexBuffer(g_pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
	ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
	ctx->VSSetShader(g_pVertexShader, NULL, 0);
	ctx->VSSetConstantBuffers(0, 1, &g_pVertexConstantBuffer);
	ctx->PSSetShader(g_pPixelShader, NULL, 0);
	ctx->PSSetSamplers(0, 1, &g_pFontSampler);
	ctx->GSSetShader(NULL, NULL, 0);
	ctx->HSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
	ctx->DSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
	ctx->CSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..

	// Setup blend state
	const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
	ctx->OMSetBlendState(g_pBlendState, blend_factor, 0xffffffff);
	ctx->OMSetDepthStencilState(g_pDepthStencilState, 0);
	ctx->RSSetState(g_pRasterizerState);
}

// Render function
// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
{
	// Avoid rendering when minimized
	if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
		return;

	ID3D11DeviceContext* ctx = g_pd3dDeviceContext;

	// Create and grow vertex/index buffers if needed
	if (!g_pVB || g_VertexBufferSize < draw_data->TotalVtxCount)
	{
		if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
		g_VertexBufferSize = draw_data->TotalVtxCount + 5000;
		D3D11_BUFFER_DESC desc;
		memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
		desc.Usage = D3D11_USAGE_DYNAMIC;
		desc.ByteWidth = g_VertexBufferSize * sizeof(ImDrawVert);
		desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
		desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
		desc.MiscFlags = 0;
		if (g_pd3dDevice->CreateBuffer(&desc, NULL, &g_pVB) < 0)
			return;
	}
	if (!g_pIB || g_IndexBufferSize < draw_data->TotalIdxCount)
	{
		if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
		g_IndexBufferSize = draw_data->TotalIdxCount + 10000;
		D3D11_BUFFER_DESC desc;
		memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
		desc.Usage = D3D11_USAGE_DYNAMIC;
		desc.ByteWidth = g_IndexBufferSize * sizeof(ImDrawIdx);
		desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
		desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
		if (g_pd3dDevice->CreateBuffer(&desc, NULL, &g_pIB) < 0)
			return;
	}

	// Upload vertex/index data into a single contiguous GPU buffer
	D3D11_MAPPED_SUBRESOURCE vtx_resource, idx_resource;
	if (ctx->Map(g_pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK)
		return;
	if (ctx->Map(g_pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK)
		return;
	ImDrawVert* vtx_dst = (ImDrawVert*)vtx_resource.pData;
	ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource.pData;
	for (int n = 0; n < draw_data->CmdListsCount; n++)
	{
		const ImDrawList* cmd_list = draw_data->CmdLists[n];
		memcpy(vtx_dst, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
		memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
		vtx_dst += cmd_list->VtxBuffer.Size;
		idx_dst += cmd_list->IdxBuffer.Size;
	}
	ctx->Unmap(g_pVB, 0);
	ctx->Unmap(g_pIB, 0);

	// Setup orthographic projection matrix into our constant buffer
	// Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
	{
		D3D11_MAPPED_SUBRESOURCE mapped_resource;
		if (ctx->Map(g_pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped_resource) != S_OK)
			return;
		VERTEX_CONSTANT_BUFFER* constant_buffer = (VERTEX_CONSTANT_BUFFER*)mapped_resource.pData;
		float L = draw_data->DisplayPos.x;
		float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
		float T = draw_data->DisplayPos.y;
		float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
		float mvp[4][4] =
		{
			{ 2.0f / (R - L),   0.0f,           0.0f,       0.0f },
			{ 0.0f,         2.0f / (T - B),     0.0f,       0.0f },
			{ 0.0f,         0.0f,           0.5f,       0.0f },
			{ (R + L) / (L - R),  (T + B) / (B - T),    0.5f,       1.0f },
		};
		memcpy(&constant_buffer->mvp, mvp, sizeof(mvp));
		ctx->Unmap(g_pVertexConstantBuffer, 0);
	}

	// Backup DX state that will be modified to restore it afterwards (unfortunately this is very ugly looking and verbose. Close your eyes!)
	struct BACKUP_DX11_STATE
	{
		UINT                        ScissorRectsCount, ViewportsCount;
		D3D11_RECT                  ScissorRects[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
		D3D11_VIEWPORT              Viewports[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
		ID3D11RasterizerState* RS;
		ID3D11BlendState* BlendState;
		FLOAT                       BlendFactor[4];
		UINT                        SampleMask;
		UINT                        StencilRef;
		ID3D11DepthStencilState* DepthStencilState;
		ID3D11ShaderResourceView* PSShaderResource;
		ID3D11SamplerState* PSSampler;
		ID3D11PixelShader* PS;
		ID3D11VertexShader* VS;
		ID3D11GeometryShader* GS;
		UINT                        PSInstancesCount, VSInstancesCount, GSInstancesCount;
		ID3D11ClassInstance* PSInstances[256], * VSInstances[256], * GSInstances[256];   // 256 is max according to PSSetShader documentation
		D3D11_PRIMITIVE_TOPOLOGY    PrimitiveTopology;
		ID3D11Buffer* IndexBuffer, * VertexBuffer, * VSConstantBuffer;
		UINT                        IndexBufferOffset, VertexBufferStride, VertexBufferOffset;
		DXGI_FORMAT                 IndexBufferFormat;
		ID3D11InputLayout* InputLayout;
	};
	BACKUP_DX11_STATE old;
	old.ScissorRectsCount = old.ViewportsCount = D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE;
	ctx->RSGetScissorRects(&old.ScissorRectsCount, old.ScissorRects);
	ctx->RSGetViewports(&old.ViewportsCount, old.Viewports);
	ctx->RSGetState(&old.RS);
	ctx->OMGetBlendState(&old.BlendState, old.BlendFactor, &old.SampleMask);
	ctx->OMGetDepthStencilState(&old.DepthStencilState, &old.StencilRef);
	ctx->PSGetShaderResources(0, 1, &old.PSShaderResource);
	ctx->PSGetSamplers(0, 1, &old.PSSampler);
	old.PSInstancesCount = old.VSInstancesCount = 256;
	ctx->PSGetShader(&old.PS, old.PSInstances, &old.PSInstancesCount);
	ctx->VSGetShader(&old.VS, old.VSInstances, &old.VSInstancesCount);
	ctx->VSGetConstantBuffers(0, 1, &old.VSConstantBuffer);
	ctx->GSGetShader(&old.GS, old.GSInstances, &old.GSInstancesCount);

	ctx->IAGetPrimitiveTopology(&old.PrimitiveTopology);
	ctx->IAGetIndexBuffer(&old.IndexBuffer, &old.IndexBufferFormat, &old.IndexBufferOffset);
	ctx->IAGetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset);
	ctx->IAGetInputLayout(&old.InputLayout);

	// Setup desired DX state
	ImGui_ImplDX11_SetupRenderState(draw_data, ctx);

	// Render command lists
	// (Because we merged all buffers into a single one, we maintain our own offset into them)
	int global_idx_offset = 0;
	int global_vtx_offset = 0;
	ImVec2 clip_off = draw_data->DisplayPos;
	for (int n = 0; n < draw_data->CmdListsCount; n++)
	{
		const ImDrawList* cmd_list = draw_data->CmdLists[n];
		for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
		{
			const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
			if (pcmd->UserCallback != NULL)
			{
				// User callback, registered via ImDrawList::AddCallback()
				// (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
				if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
					ImGui_ImplDX11_SetupRenderState(draw_data, ctx);
				else
					pcmd->UserCallback(cmd_list, pcmd);
			}
			else
			{
				// Apply scissor/clipping rectangle
				const D3D11_RECT r = { (LONG)(pcmd->ClipRect.x - clip_off.x), (LONG)(pcmd->ClipRect.y - clip_off.y), (LONG)(pcmd->ClipRect.z - clip_off.x), (LONG)(pcmd->ClipRect.w - clip_off.y) };
				ctx->RSSetScissorRects(1, &r);

				// Bind texture, Draw
				ID3D11ShaderResourceView* texture_srv = (ID3D11ShaderResourceView*)pcmd->TextureId;
				ctx->PSSetShaderResources(0, 1, &texture_srv);
				ctx->DrawIndexed(pcmd->ElemCount, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset);
			}
		}
		global_idx_offset += cmd_list->IdxBuffer.Size;
		global_vtx_offset += cmd_list->VtxBuffer.Size;
	}

	// Restore modified DX state
	ctx->RSSetScissorRects(old.ScissorRectsCount, old.ScissorRects);
	ctx->RSSetViewports(old.ViewportsCount, old.Viewports);
	ctx->RSSetState(old.RS); if (old.RS) old.RS->Release();
	ctx->OMSetBlendState(old.BlendState, old.BlendFactor, old.SampleMask); if (old.BlendState) old.BlendState->Release();
	ctx->OMSetDepthStencilState(old.DepthStencilState, old.StencilRef); if (old.DepthStencilState) old.DepthStencilState->Release();
	ctx->PSSetShaderResources(0, 1, &old.PSShaderResource); if (old.PSShaderResource) old.PSShaderResource->Release();
	ctx->PSSetSamplers(0, 1, &old.PSSampler); if (old.PSSampler) old.PSSampler->Release();
	ctx->PSSetShader(old.PS, old.PSInstances, old.PSInstancesCount); if (old.PS) old.PS->Release();
	for (UINT i = 0; i < old.PSInstancesCount; i++) if (old.PSInstances[i]) old.PSInstances[i]->Release();
	ctx->VSSetShader(old.VS, old.VSInstances, old.VSInstancesCount); if (old.VS) old.VS->Release();
	ctx->VSSetConstantBuffers(0, 1, &old.VSConstantBuffer); if (old.VSConstantBuffer) old.VSConstantBuffer->Release();
	ctx->GSSetShader(old.GS, old.GSInstances, old.GSInstancesCount); if (old.GS) old.GS->Release();
	for (UINT i = 0; i < old.VSInstancesCount; i++) if (old.VSInstances[i]) old.VSInstances[i]->Release();
	ctx->IASetPrimitiveTopology(old.PrimitiveTopology);
	ctx->IASetIndexBuffer(old.IndexBuffer, old.IndexBufferFormat, old.IndexBufferOffset); if (old.IndexBuffer) old.IndexBuffer->Release();
	ctx->IASetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset); if (old.VertexBuffer) old.VertexBuffer->Release();
	ctx->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release();
}

static void ImGui_ImplDX11_CreateFontsTexture()
{
	// Build texture atlas
	ImGuiIO& io = ImGui::GetIO();
	unsigned char* pixels;
	int width, height;
	io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);

	// Upload texture to graphics system
	{
		D3D11_TEXTURE2D_DESC desc;
		ZeroMemory(&desc, sizeof(desc));
		desc.Width = width;
		desc.Height = height;
		desc.MipLevels = 1;
		desc.ArraySize = 1;
		desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
		desc.SampleDesc.Count = 1;
		desc.Usage = D3D11_USAGE_DEFAULT;
		desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
		desc.CPUAccessFlags = 0;

		ID3D11Texture2D* pTexture = NULL;
		D3D11_SUBRESOURCE_DATA subResource;
		subResource.pSysMem = pixels;
		subResource.SysMemPitch = desc.Width * 4;
		subResource.SysMemSlicePitch = 0;
		g_pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);

		// Create texture view
		D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
		ZeroMemory(&srvDesc, sizeof(srvDesc));
		srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
		srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
		srvDesc.Texture2D.MipLevels = desc.MipLevels;
		srvDesc.Texture2D.MostDetailedMip = 0;
		g_pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, &g_pFontTextureView);
		pTexture->Release();
	}

	// Store our identifier
	io.Fonts->TexID = (ImTextureID)g_pFontTextureView;

	// Create texture sampler
	{
		D3D11_SAMPLER_DESC desc;
		ZeroMemory(&desc, sizeof(desc));
		desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
		desc.AddressU = D3D11_TEXTURE_ADDRESS_WRAP;
		desc.AddressV = D3D11_TEXTURE_ADDRESS_WRAP;
		desc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP;
		desc.MipLODBias = 0.f;
		desc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
		desc.MinLOD = 0.f;
		desc.MaxLOD = 0.f;
		g_pd3dDevice->CreateSamplerState(&desc, &g_pFontSampler);
	}
}

bool    ImGui_ImplDX11_CreateDeviceObjects()
{
	if (!g_pd3dDevice)
		return false;
	if (g_pFontSampler)
		ImGui_ImplDX11_InvalidateDeviceObjects();

	// By using D3DCompile() from <d3dcompiler.h> / d3dcompiler.lib, we introduce a dependency to a given version of d3dcompiler_XX.dll (see D3DCOMPILER_DLL_A)
	// If you would like to use this DX11 sample code but remove this dependency you can:
	//  1) compile once, save the compiled shader blobs into a file or source code and pass them to CreateVertexShader()/CreatePixelShader() [preferred solution]
	//  2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL.
	// See https://github.com/ocornut/imgui/pull/638 for sources and details.

	// Create the vertex shader
	{
		static const char* vertexShader =
			"cbuffer vertexBuffer : register(b0) \
            {\
            float4x4 ProjectionMatrix; \
            };\
            struct VS_INPUT\
            {\
            float2 pos : POSITION;\
            float4 col : COLOR0;\
            float2 uv  : TEXCOORD0;\
            };\
            \
            struct PS_INPUT\
            {\
            float4 pos : SV_POSITION;\
            float4 col : COLOR0;\
            float2 uv  : TEXCOORD0;\
            };\
            \
            PS_INPUT main(VS_INPUT input)\
            {\
            PS_INPUT output;\
            output.pos = mul( ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));\
            output.col = input.col;\
            output.uv  = input.uv;\
            return output;\
            }";

		D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_4_0", 0, 0, &g_pVertexShaderBlob, NULL);
		if (g_pVertexShaderBlob == NULL) // NB: Pass ID3D10Blob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
			return false;
		if (g_pd3dDevice->CreateVertexShader((DWORD*)g_pVertexShaderBlob->GetBufferPointer(), g_pVertexShaderBlob->GetBufferSize(), NULL, &g_pVertexShader) != S_OK)
			return false;

		// Create the input layout
		D3D11_INPUT_ELEMENT_DESC local_layout[] =
		{
			{ "POSITION", 0, DXGI_FORMAT_R32G32_FLOAT,   0, (size_t)(&((ImDrawVert*)0)->pos), D3D11_INPUT_PER_VERTEX_DATA, 0 },
			{ "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT,   0, (size_t)(&((ImDrawVert*)0)->uv),  D3D11_INPUT_PER_VERTEX_DATA, 0 },
			{ "COLOR",    0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (size_t)(&((ImDrawVert*)0)->col), D3D11_INPUT_PER_VERTEX_DATA, 0 },
		};
		if (g_pd3dDevice->CreateInputLayout(local_layout, 3, g_pVertexShaderBlob->GetBufferPointer(), g_pVertexShaderBlob->GetBufferSize(), &g_pInputLayout) != S_OK)
			return false;

		// Create the constant buffer
		{
			D3D11_BUFFER_DESC desc;
			desc.ByteWidth = sizeof(VERTEX_CONSTANT_BUFFER);
			desc.Usage = D3D11_USAGE_DYNAMIC;
			desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
			desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
			desc.MiscFlags = 0;
			g_pd3dDevice->CreateBuffer(&desc, NULL, &g_pVertexConstantBuffer);
		}
	}

	// Create the pixel shader
	{
		static const char* pixelShader =
			"struct PS_INPUT\
            {\
            float4 pos : SV_POSITION;\
            float4 col : COLOR0;\
            float2 uv  : TEXCOORD0;\
            };\
            sampler sampler0;\
            Texture2D texture0;\
            \
            float4 main(PS_INPUT input) : SV_Target\
            {\
            float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \
            return out_col; \
            }";

		D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_4_0", 0, 0, &g_pPixelShaderBlob, NULL);
		if (g_pPixelShaderBlob == NULL)  // NB: Pass ID3D10Blob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
			return false;
		if (g_pd3dDevice->CreatePixelShader((DWORD*)g_pPixelShaderBlob->GetBufferPointer(), g_pPixelShaderBlob->GetBufferSize(), NULL, &g_pPixelShader) != S_OK)
			return false;
	}

	// Create the blending setup
	{
		// ESP BLEND
		//D3D11_BLEND_DESC desc;
		//ZeroMemory(&desc, sizeof(desc));
		//desc.AlphaToCoverageEnable = false;
		//desc.RenderTarget[0].BlendEnable = true;
		//desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
		//desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
		//desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
		//desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_INV_DEST_ALPHA; //
		//desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ONE; //
		//desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
		//desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
		//g_pd3dDevice->CreateBlendState(&desc, &g_pBlendState);

		// Normal
		D3D11_BLEND_DESC desc;
		ZeroMemory(&desc, sizeof(desc));
		desc.AlphaToCoverageEnable = false;
		desc.RenderTarget[0].BlendEnable = true;
		desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
		desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
		desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
		desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_INV_SRC_ALPHA;
		desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
		desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
		desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
		g_pd3dDevice->CreateBlendState(&desc, &g_pBlendState);

	}

	// Create the rasterizer state
	{
		D3D11_RASTERIZER_DESC desc;
		ZeroMemory(&desc, sizeof(desc));
		desc.FillMode = D3D11_FILL_SOLID;
		desc.CullMode = D3D11_CULL_NONE;
		desc.ScissorEnable = true;
		desc.DepthClipEnable = true;
		g_pd3dDevice->CreateRasterizerState(&desc, &g_pRasterizerState);
	}

	// Create depth-stencil State
	{
		D3D11_DEPTH_STENCIL_DESC desc;
		ZeroMemory(&desc, sizeof(desc));
		desc.DepthEnable = false;
		desc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
		desc.DepthFunc = D3D11_COMPARISON_ALWAYS;
		desc.StencilEnable = false;
		desc.FrontFace.StencilFailOp = desc.FrontFace.StencilDepthFailOp = desc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
		desc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;
		desc.BackFace = desc.FrontFace;
		g_pd3dDevice->CreateDepthStencilState(&desc, &g_pDepthStencilState);
	}

	ImGui_ImplDX11_CreateFontsTexture();

	return true;
}

void    ImGui_ImplDX11_InvalidateDeviceObjects()
{
	if (!g_pd3dDevice)
		return;

	if (g_pFontSampler) { g_pFontSampler->Release(); g_pFontSampler = NULL; }
	if (g_pFontTextureView) { g_pFontTextureView->Release(); g_pFontTextureView = NULL; ImGui::GetIO().Fonts->TexID = NULL; } // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
	if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
	if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }

	if (g_pBlendState) { g_pBlendState->Release(); g_pBlendState = NULL; }
	if (g_pDepthStencilState) { g_pDepthStencilState->Release(); g_pDepthStencilState = NULL; }
	if (g_pRasterizerState) { g_pRasterizerState->Release(); g_pRasterizerState = NULL; }
	if (g_pPixelShader) { g_pPixelShader->Release(); g_pPixelShader = NULL; }
	if (g_pPixelShaderBlob) { g_pPixelShaderBlob->Release(); g_pPixelShaderBlob = NULL; }
	if (g_pVertexConstantBuffer) { g_pVertexConstantBuffer->Release(); g_pVertexConstantBuffer = NULL; }
	if (g_pInputLayout) { g_pInputLayout->Release(); g_pInputLayout = NULL; }
	if (g_pVertexShader) { g_pVertexShader->Release(); g_pVertexShader = NULL; }
	if (g_pVertexShaderBlob) { g_pVertexShaderBlob->Release(); g_pVertexShaderBlob = NULL; }
}

bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context)
{
	// Setup back-end capabilities flags
	ImGuiIO& io = ImGui::GetIO();
	io.BackendRendererName = "imgui_impl_dx11";
	io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.

	// Get factory from device
	IDXGIDevice* pDXGIDevice = NULL;
	IDXGIAdapter* pDXGIAdapter = NULL;
	IDXGIFactory* pFactory = NULL;

	if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK)
		if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK)
			if (pDXGIAdapter->GetParent(IID_PPV_ARGS(&pFactory)) == S_OK)
			{
				g_pd3dDevice = device;
				g_pd3dDeviceContext = device_context;
				g_pFactory = pFactory;
			}
	if (pDXGIDevice) pDXGIDevice->Release();
	if (pDXGIAdapter) pDXGIAdapter->Release();
	g_pd3dDevice->AddRef();
	g_pd3dDeviceContext->AddRef();

	return true;
}

void ImGui_ImplDX11_Shutdown()
{
	ImGui_ImplDX11_InvalidateDeviceObjects();
	if (g_pFactory) { g_pFactory->Release(); g_pFactory = NULL; }
	if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
	if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = NULL; }
}

void ImGui_ImplDX11_NewFrame()
{
	if (!g_pFontSampler)
		ImGui_ImplDX11_CreateDeviceObjects();
}