mirror of
https://github.com/ocornut/imgui.git
synced 2024-11-24 15:50:25 +01:00
475 lines
18 KiB
C++
475 lines
18 KiB
C++
// ImGui Win32 + DirectX11 binding
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// https://github.com/ocornut/imgui
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#include <imgui.h>
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#include "imgui_impl_dx11.h"
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// DirectX
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#include <d3d11.h>
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#include <d3dcompiler.h>
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#define DIRECTINPUT_VERSION 0x0800
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#include <dinput.h>
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// Data
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static INT64 g_Time = 0;
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static INT64 g_TicksPerSecond = 0;
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static HWND g_hWnd = 0;
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static ID3D11Device* g_pd3dDevice = NULL;
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static ID3D11DeviceContext* g_pd3dDeviceContext = NULL;
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static ID3D11Buffer* g_pVB = NULL;
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static ID3D10Blob * g_pVertexShaderBlob = NULL;
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static ID3D11VertexShader* g_pVertexShader = NULL;
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static ID3D11InputLayout* g_pInputLayout = NULL;
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static ID3D11Buffer* g_pVertexConstantBuffer = NULL;
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static ID3D10Blob * g_pPixelShaderBlob = NULL;
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static ID3D11PixelShader* g_pPixelShader = NULL;
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static ID3D11SamplerState* g_pFontSampler = NULL;
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static ID3D11ShaderResourceView*g_pFontTextureView = NULL;
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static ID3D11RasterizerState* g_pRasterizerState = NULL;
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static ID3D11BlendState* g_pBlendState = NULL;
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static int VERTEX_BUFFER_SIZE = 30000; // TODO: Make vertex buffer smaller and grow dynamically as needed.
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struct VERTEX_CONSTANT_BUFFER
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{
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float mvp[4][4];
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};
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// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
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// If text or lines are blurry when integrating ImGui in your engine:
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// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
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static void ImGui_ImplDX11_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
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{
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// Copy and convert all vertices into a single contiguous buffer
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D3D11_MAPPED_SUBRESOURCE mappedResource;
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if (g_pd3dDeviceContext->Map(g_pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource) != S_OK)
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return;
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ImDrawVert* vtx_dst = (ImDrawVert*)mappedResource.pData;
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for (int n = 0; n < cmd_lists_count; n++)
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{
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const ImDrawList* cmd_list = cmd_lists[n];
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memcpy(vtx_dst, &cmd_list->vtx_buffer[0], cmd_list->vtx_buffer.size() * sizeof(ImDrawVert));
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vtx_dst += cmd_list->vtx_buffer.size();
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}
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g_pd3dDeviceContext->Unmap(g_pVB, 0);
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// Setup orthographic projection matrix into our constant buffer
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{
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D3D11_MAPPED_SUBRESOURCE mappedResource;
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if (g_pd3dDeviceContext->Map(g_pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource) != S_OK)
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return;
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VERTEX_CONSTANT_BUFFER* pConstantBuffer = (VERTEX_CONSTANT_BUFFER*)mappedResource.pData;
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const float L = 0.0f;
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const float R = ImGui::GetIO().DisplaySize.x;
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const float B = ImGui::GetIO().DisplaySize.y;
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const float T = 0.0f;
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const float mvp[4][4] =
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{
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{ 2.0f/(R-L), 0.0f, 0.0f, 0.0f},
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{ 0.0f, 2.0f/(T-B), 0.0f, 0.0f,},
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{ 0.0f, 0.0f, 0.5f, 0.0f },
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{ (R+L)/(L-R), (T+B)/(B-T), 0.5f, 1.0f },
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};
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memcpy(&pConstantBuffer->mvp, mvp, sizeof(mvp));
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g_pd3dDeviceContext->Unmap(g_pVertexConstantBuffer, 0);
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}
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// Setup viewport
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{
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D3D11_VIEWPORT vp;
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memset(&vp, 0, sizeof(D3D11_VIEWPORT));
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vp.Width = ImGui::GetIO().DisplaySize.x;
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vp.Height = ImGui::GetIO().DisplaySize.y;
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vp.MinDepth = 0.0f;
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vp.MaxDepth = 1.0f;
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vp.TopLeftX = 0;
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vp.TopLeftY = 0;
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g_pd3dDeviceContext->RSSetViewports(1, &vp);
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}
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// Bind shader and vertex buffers
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unsigned int stride = sizeof(ImDrawVert);
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unsigned int offset = 0;
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g_pd3dDeviceContext->IASetInputLayout(g_pInputLayout);
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g_pd3dDeviceContext->IASetVertexBuffers(0, 1, &g_pVB, &stride, &offset);
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g_pd3dDeviceContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
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g_pd3dDeviceContext->VSSetShader(g_pVertexShader, NULL, 0);
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g_pd3dDeviceContext->VSSetConstantBuffers(0, 1, &g_pVertexConstantBuffer);
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g_pd3dDeviceContext->PSSetShader(g_pPixelShader, NULL, 0);
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g_pd3dDeviceContext->PSSetSamplers(0, 1, &g_pFontSampler);
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// Setup render state
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const float blendFactor[4] = { 0.f, 0.f, 0.f, 0.f };
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g_pd3dDeviceContext->OMSetBlendState(g_pBlendState, blendFactor, 0xffffffff);
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g_pd3dDeviceContext->RSSetState(g_pRasterizerState);
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// Render command lists
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int vtx_offset = 0;
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for (int n = 0; n < cmd_lists_count; n++)
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{
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const ImDrawList* cmd_list = cmd_lists[n];
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for (int cmd_i = 0; cmd_i < cmd_list->commands.size(); cmd_i++)
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{
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const ImDrawCmd* pcmd = &cmd_list->commands[cmd_i];
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if (pcmd->user_callback)
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{
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pcmd->user_callback(cmd_list, pcmd);
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}
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else
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{
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const D3D11_RECT r = { (LONG)pcmd->clip_rect.x, (LONG)pcmd->clip_rect.y, (LONG)pcmd->clip_rect.z, (LONG)pcmd->clip_rect.w };
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g_pd3dDeviceContext->PSSetShaderResources(0, 1, (ID3D11ShaderResourceView**)&pcmd->texture_id);
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g_pd3dDeviceContext->RSSetScissorRects(1, &r);
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g_pd3dDeviceContext->Draw(pcmd->vtx_count, vtx_offset);
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}
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vtx_offset += pcmd->vtx_count;
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}
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}
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// Restore modified state
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g_pd3dDeviceContext->IASetInputLayout(NULL);
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g_pd3dDeviceContext->PSSetShader(NULL, NULL, 0);
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g_pd3dDeviceContext->VSSetShader(NULL, NULL, 0);
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}
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LRESULT ImGui_ImplDX11_WndProcHandler(HWND, UINT msg, WPARAM wParam, LPARAM lParam)
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{
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ImGuiIO& io = ImGui::GetIO();
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switch (msg)
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{
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case WM_LBUTTONDOWN:
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io.MouseDown[0] = true;
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return true;
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case WM_LBUTTONUP:
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io.MouseDown[0] = false;
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return true;
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case WM_RBUTTONDOWN:
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io.MouseDown[1] = true;
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return true;
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case WM_RBUTTONUP:
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io.MouseDown[1] = false;
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return true;
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case WM_MOUSEWHEEL:
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io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
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return true;
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case WM_MOUSEMOVE:
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io.MousePos.x = (signed short)(lParam);
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io.MousePos.y = (signed short)(lParam >> 16);
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return true;
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case WM_KEYDOWN:
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if (wParam < 256)
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io.KeysDown[wParam] = 1;
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return true;
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case WM_KEYUP:
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if (wParam < 256)
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io.KeysDown[wParam] = 0;
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return true;
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case WM_CHAR:
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// You can also use ToAscii()+GetKeyboardState() to retrieve characters.
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if (wParam > 0 && wParam < 0x10000)
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io.AddInputCharacter((unsigned short)wParam);
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return true;
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}
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return 0;
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}
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static void ImGui_ImplDX11_CreateFontsTexture()
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{
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ImGuiIO& io = ImGui::GetIO();
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// Build
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unsigned char* pixels;
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int width, height;
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io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
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// Create DX11 texture
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{
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D3D11_TEXTURE2D_DESC texDesc;
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ZeroMemory(&texDesc, sizeof(texDesc));
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texDesc.Width = width;
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texDesc.Height = height;
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texDesc.MipLevels = 1;
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texDesc.ArraySize = 1;
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texDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
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texDesc.SampleDesc.Count = 1;
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texDesc.Usage = D3D11_USAGE_DEFAULT;
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texDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
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texDesc.CPUAccessFlags = 0;
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ID3D11Texture2D *pTexture = NULL;
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D3D11_SUBRESOURCE_DATA subResource;
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subResource.pSysMem = pixels;
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subResource.SysMemPitch = texDesc.Width * 4;
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subResource.SysMemSlicePitch = 0;
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g_pd3dDevice->CreateTexture2D(&texDesc, &subResource, &pTexture);
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// Create texture view
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D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
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ZeroMemory(&srvDesc, sizeof(srvDesc));
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srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
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srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
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srvDesc.Texture2D.MipLevels = texDesc.MipLevels;
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srvDesc.Texture2D.MostDetailedMip = 0;
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g_pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, &g_pFontTextureView);
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pTexture->Release();
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}
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// Store our identifier
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io.Fonts->TexID = (void *)g_pFontTextureView;
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// Create texture sampler
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{
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D3D11_SAMPLER_DESC samplerDesc;
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ZeroMemory(&samplerDesc, sizeof(samplerDesc));
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samplerDesc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
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samplerDesc.AddressU = D3D11_TEXTURE_ADDRESS_WRAP;
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samplerDesc.AddressV = D3D11_TEXTURE_ADDRESS_WRAP;
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samplerDesc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP;
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samplerDesc.MipLODBias = 0.f;
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samplerDesc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
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samplerDesc.MinLOD = 0.f;
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samplerDesc.MaxLOD = 0.f;
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g_pd3dDevice->CreateSamplerState(&samplerDesc, &g_pFontSampler);
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}
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// Cleanup (don't clear the input data if you want to append new fonts later)
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io.Fonts->ClearInputData();
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io.Fonts->ClearTexData();
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}
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bool ImGui_ImplDX11_CreateDeviceObjects()
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{
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if (!g_pd3dDevice)
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return false;
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if (g_pVB)
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ImGui_ImplDX11_InvalidateDeviceObjects();
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// Create the vertex shader
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{
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static const char* vertexShader =
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"cbuffer vertexBuffer : register(c0) \
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{\
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float4x4 ProjectionMatrix; \
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};\
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struct VS_INPUT\
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{\
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float2 pos : POSITION;\
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float4 col : COLOR0;\
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float2 uv : TEXCOORD0;\
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};\
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\
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struct PS_INPUT\
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{\
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float4 pos : SV_POSITION;\
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float4 col : COLOR0;\
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float2 uv : TEXCOORD0;\
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};\
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\
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PS_INPUT main(VS_INPUT input)\
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{\
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PS_INPUT output;\
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output.pos = mul( ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));\
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output.col = input.col;\
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output.uv = input.uv;\
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return output;\
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}";
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D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_5_0", 0, 0, &g_pVertexShaderBlob, NULL);
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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!
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return false;
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if (g_pd3dDevice->CreateVertexShader((DWORD*)g_pVertexShaderBlob->GetBufferPointer(), g_pVertexShaderBlob->GetBufferSize(), NULL, &g_pVertexShader) != S_OK)
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return false;
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// Create the input layout
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D3D11_INPUT_ELEMENT_DESC localLayout[] = {
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{ "POSITION", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, (size_t)(&((ImDrawVert*)0)->pos), D3D11_INPUT_PER_VERTEX_DATA, 0 },
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{ "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, (size_t)(&((ImDrawVert*)0)->uv), D3D11_INPUT_PER_VERTEX_DATA, 0 },
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{ "COLOR", 0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (size_t)(&((ImDrawVert*)0)->col), D3D11_INPUT_PER_VERTEX_DATA, 0 },
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};
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if (g_pd3dDevice->CreateInputLayout(localLayout, 3, g_pVertexShaderBlob->GetBufferPointer(), g_pVertexShaderBlob->GetBufferSize(), &g_pInputLayout) != S_OK)
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return false;
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// Create the constant buffer
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{
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D3D11_BUFFER_DESC cbDesc;
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cbDesc.ByteWidth = sizeof(VERTEX_CONSTANT_BUFFER);
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cbDesc.Usage = D3D11_USAGE_DYNAMIC;
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cbDesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
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cbDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
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cbDesc.MiscFlags = 0;
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g_pd3dDevice->CreateBuffer(&cbDesc, NULL, &g_pVertexConstantBuffer);
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}
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}
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// Create the pixel shader
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{
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static const char* pixelShader =
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"struct PS_INPUT\
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{\
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float4 pos : SV_POSITION;\
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float4 col : COLOR0;\
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float2 uv : TEXCOORD0;\
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};\
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sampler sampler0;\
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Texture2D texture0;\
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\
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float4 main(PS_INPUT input) : SV_Target\
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{\
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float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \
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return out_col; \
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}";
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D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_5_0", 0, 0, &g_pPixelShaderBlob, NULL);
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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!
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return false;
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if (g_pd3dDevice->CreatePixelShader((DWORD*)g_pPixelShaderBlob->GetBufferPointer(), g_pPixelShaderBlob->GetBufferSize(), NULL, &g_pPixelShader) != S_OK)
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return false;
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}
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// Create the blending setup
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{
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D3D11_BLEND_DESC desc;
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ZeroMemory(&desc, sizeof(desc));
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desc.AlphaToCoverageEnable = false;
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desc.RenderTarget[0].BlendEnable = true;
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desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
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desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
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desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
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desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_INV_SRC_ALPHA;
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desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO;
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desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
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desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
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g_pd3dDevice->CreateBlendState(&desc, &g_pBlendState);
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}
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// Create the rasterizer state
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{
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D3D11_RASTERIZER_DESC desc;
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ZeroMemory(&desc, sizeof(desc));
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desc.FillMode = D3D11_FILL_SOLID;
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desc.CullMode = D3D11_CULL_NONE;
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desc.ScissorEnable = true;
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desc.DepthClipEnable = true;
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g_pd3dDevice->CreateRasterizerState(&desc, &g_pRasterizerState);
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}
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// Create the vertex buffer
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{
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D3D11_BUFFER_DESC desc;
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memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
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desc.Usage = D3D11_USAGE_DYNAMIC;
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desc.ByteWidth = VERTEX_BUFFER_SIZE * sizeof(ImDrawVert);
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desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
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desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
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desc.MiscFlags = 0;
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if (g_pd3dDevice->CreateBuffer(&desc, NULL, &g_pVB) < 0)
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return false;
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}
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ImGui_ImplDX11_CreateFontsTexture();
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return true;
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}
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void ImGui_ImplDX11_InvalidateDeviceObjects()
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{
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if (!g_pd3dDevice)
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return;
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if (g_pFontSampler) { g_pFontSampler->Release(); g_pFontSampler = NULL; }
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if (g_pFontTextureView) { g_pFontTextureView->Release(); ImGui::GetIO().Fonts->TexID = 0; }
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if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
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if (g_pBlendState) { g_pBlendState->Release(); g_pBlendState = NULL; }
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if (g_pRasterizerState) { g_pRasterizerState->Release(); g_pRasterizerState = NULL; }
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if (g_pPixelShader) { g_pPixelShader->Release(); g_pPixelShader = NULL; }
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if (g_pPixelShaderBlob) { g_pPixelShaderBlob->Release(); g_pPixelShaderBlob = NULL; }
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if (g_pVertexConstantBuffer) { g_pVertexConstantBuffer->Release(); g_pVertexConstantBuffer = NULL; }
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if (g_pInputLayout) { g_pInputLayout->Release(); g_pInputLayout = NULL; }
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if (g_pVertexShader) { g_pVertexShader->Release(); g_pVertexShader = NULL; }
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if (g_pVertexShaderBlob) { g_pVertexShaderBlob->Release(); g_pVertexShaderBlob = NULL; }
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}
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bool ImGui_ImplDX11_Init(void* hwnd, ID3D11Device* device, ID3D11DeviceContext* device_context)
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{
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g_hWnd = (HWND)hwnd;
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g_pd3dDevice = device;
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g_pd3dDeviceContext = device_context;
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if (!QueryPerformanceFrequency((LARGE_INTEGER *)&g_TicksPerSecond))
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return false;
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if (!QueryPerformanceCounter((LARGE_INTEGER *)&g_Time))
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return false;
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ImGuiIO& io = ImGui::GetIO();
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io.KeyMap[ImGuiKey_Tab] = VK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array that we will update during the application lifetime.
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io.KeyMap[ImGuiKey_LeftArrow] = VK_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = VK_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = VK_UP;
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io.KeyMap[ImGuiKey_DownArrow] = VK_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = VK_PRIOR;
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io.KeyMap[ImGuiKey_PageDown] = VK_NEXT;
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io.KeyMap[ImGuiKey_Home] = VK_HOME;
|
|
io.KeyMap[ImGuiKey_End] = VK_END;
|
|
io.KeyMap[ImGuiKey_Delete] = VK_DELETE;
|
|
io.KeyMap[ImGuiKey_Backspace] = VK_BACK;
|
|
io.KeyMap[ImGuiKey_Enter] = VK_RETURN;
|
|
io.KeyMap[ImGuiKey_Escape] = VK_ESCAPE;
|
|
io.KeyMap[ImGuiKey_A] = 'A';
|
|
io.KeyMap[ImGuiKey_C] = 'C';
|
|
io.KeyMap[ImGuiKey_V] = 'V';
|
|
io.KeyMap[ImGuiKey_X] = 'X';
|
|
io.KeyMap[ImGuiKey_Y] = 'Y';
|
|
io.KeyMap[ImGuiKey_Z] = 'Z';
|
|
|
|
io.RenderDrawListsFn = ImGui_ImplDX11_RenderDrawLists;
|
|
io.ImeWindowHandle = g_hWnd;
|
|
|
|
return true;
|
|
}
|
|
|
|
void ImGui_ImplDX11_Shutdown()
|
|
{
|
|
ImGui_ImplDX11_InvalidateDeviceObjects();
|
|
ImGui::Shutdown();
|
|
g_pd3dDevice = NULL;
|
|
g_pd3dDeviceContext = NULL;
|
|
g_hWnd = (HWND)0;
|
|
}
|
|
|
|
void ImGui_ImplDX11_NewFrame()
|
|
{
|
|
if (!g_pVB)
|
|
ImGui_ImplDX11_CreateDeviceObjects();
|
|
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
|
|
// Setup display size (every frame to accommodate for window resizing)
|
|
RECT rect;
|
|
GetClientRect(g_hWnd, &rect);
|
|
io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));
|
|
|
|
// Setup time step
|
|
INT64 current_time;
|
|
QueryPerformanceCounter((LARGE_INTEGER *)¤t_time);
|
|
io.DeltaTime = (float)(current_time - g_Time) / g_TicksPerSecond;
|
|
g_Time = current_time;
|
|
|
|
// Read keyboard modifiers inputs
|
|
io.KeyCtrl = (GetKeyState(VK_CONTROL) & 0x8000) != 0;
|
|
io.KeyShift = (GetKeyState(VK_SHIFT) & 0x8000) != 0;
|
|
io.KeyAlt = (GetKeyState(VK_MENU) & 0x8000) != 0;
|
|
// io.KeysDown : filled by WM_KEYDOWN/WM_KEYUP events
|
|
// io.MousePos : filled by WM_MOUSEMOVE events
|
|
// io.MouseDown : filled by WM_*BUTTON* events
|
|
// io.MouseWheel : filled by WM_MOUSEWHEEL events
|
|
|
|
// Hide OS mouse cursor if ImGui is drawing it
|
|
SetCursor(io.MouseDrawCursor ? NULL : LoadCursor(NULL, IDC_ARROW));
|
|
|
|
// Start the frame
|
|
ImGui::NewFrame();
|
|
}
|