mirror of
https://github.com/ocornut/imgui.git
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255 lines
10 KiB
C++
255 lines
10 KiB
C++
// ImGui Renderer for: DirectX9
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// This needs to be used along with a Platform Binding (e.g. Win32)
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// Implemented features:
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// [X] User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
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// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
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// If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
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// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
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// https://github.com/ocornut/imgui
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX9_RenderDrawData() in the .h file so you can call it yourself.
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// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
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#include "imgui.h"
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#include "imgui_impl_dx9.h"
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// DirectX
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#include <d3d9.h>
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#define DIRECTINPUT_VERSION 0x0800
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#include <dinput.h>
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// DirectX data
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static LPDIRECT3DDEVICE9 g_pd3dDevice = NULL;
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static LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL;
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static LPDIRECT3DINDEXBUFFER9 g_pIB = NULL;
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static LPDIRECT3DTEXTURE9 g_FontTexture = NULL;
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static int g_VertexBufferSize = 5000, g_IndexBufferSize = 10000;
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struct CUSTOMVERTEX
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{
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float pos[3];
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D3DCOLOR col;
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float uv[2];
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};
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#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
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// Render function.
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// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
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void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
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{
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// Avoid rendering when minimized
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if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
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return;
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// Create and grow buffers if needed
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if (!g_pVB || g_VertexBufferSize < draw_data->TotalVtxCount)
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{
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if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
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g_VertexBufferSize = draw_data->TotalVtxCount + 5000;
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if (g_pd3dDevice->CreateVertexBuffer(g_VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &g_pVB, NULL) < 0)
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return;
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}
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if (!g_pIB || g_IndexBufferSize < draw_data->TotalIdxCount)
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{
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if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
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g_IndexBufferSize = draw_data->TotalIdxCount + 10000;
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if (g_pd3dDevice->CreateIndexBuffer(g_IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &g_pIB, NULL) < 0)
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return;
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}
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// Backup the DX9 state
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IDirect3DStateBlock9* d3d9_state_block = NULL;
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if (g_pd3dDevice->CreateStateBlock(D3DSBT_ALL, &d3d9_state_block) < 0)
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return;
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// Copy and convert all vertices into a single contiguous buffer
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CUSTOMVERTEX* vtx_dst;
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ImDrawIdx* idx_dst;
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if (g_pVB->Lock(0, (UINT)(draw_data->TotalVtxCount * sizeof(CUSTOMVERTEX)), (void**)&vtx_dst, D3DLOCK_DISCARD) < 0)
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return;
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if (g_pIB->Lock(0, (UINT)(draw_data->TotalIdxCount * sizeof(ImDrawIdx)), (void**)&idx_dst, D3DLOCK_DISCARD) < 0)
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return;
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for (int n = 0; n < draw_data->CmdListsCount; n++)
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{
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const ImDrawList* cmd_list = draw_data->CmdLists[n];
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const ImDrawVert* vtx_src = cmd_list->VtxBuffer.Data;
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for (int i = 0; i < cmd_list->VtxBuffer.Size; i++)
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{
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vtx_dst->pos[0] = vtx_src->pos.x;
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vtx_dst->pos[1] = vtx_src->pos.y;
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vtx_dst->pos[2] = 0.0f;
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vtx_dst->col = (vtx_src->col & 0xFF00FF00) | ((vtx_src->col & 0xFF0000)>>16) | ((vtx_src->col & 0xFF) << 16); // RGBA --> ARGB for DirectX9
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vtx_dst->uv[0] = vtx_src->uv.x;
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vtx_dst->uv[1] = vtx_src->uv.y;
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vtx_dst++;
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vtx_src++;
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}
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memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
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idx_dst += cmd_list->IdxBuffer.Size;
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}
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g_pVB->Unlock();
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g_pIB->Unlock();
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g_pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(CUSTOMVERTEX));
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g_pd3dDevice->SetIndices(g_pIB);
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g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
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// Setup viewport
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D3DVIEWPORT9 vp;
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vp.X = vp.Y = 0;
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vp.Width = (DWORD)draw_data->DisplaySize.x;
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vp.Height = (DWORD)draw_data->DisplaySize.y;
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vp.MinZ = 0.0f;
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vp.MaxZ = 1.0f;
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g_pd3dDevice->SetViewport(&vp);
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// Setup render state: fixed-pipeline, alpha-blending, no face culling, no depth testing
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g_pd3dDevice->SetPixelShader(NULL);
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g_pd3dDevice->SetVertexShader(NULL);
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g_pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
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g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, false);
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g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
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g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
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g_pd3dDevice->SetRenderState(D3DRS_ALPHATESTENABLE, false);
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g_pd3dDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_ADD);
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g_pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
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g_pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
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g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, true);
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g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);
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g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
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g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
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g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
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g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
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g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
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g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
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g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
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// Setup orthographic projection matrix
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// Being agnostic of whether <d3dx9.h> or <DirectXMath.h> can be used, we aren't relying on D3DXMatrixIdentity()/D3DXMatrixOrthoOffCenterLH() or DirectX::XMMatrixIdentity()/DirectX::XMMatrixOrthographicOffCenterLH()
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{
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float L = draw_data->DisplayPos.x + 0.5f;
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float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x + 0.5f;
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float T = draw_data->DisplayPos.y + 0.5f;
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float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y + 0.5f;
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D3DMATRIX mat_identity = { { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f } };
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D3DMATRIX mat_projection =
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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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(L+R)/(L-R), (T+B)/(B-T), 0.5f, 1.0f,
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};
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g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat_identity);
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g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat_identity);
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g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat_projection);
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}
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// Render command lists
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int vtx_offset = 0;
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int idx_offset = 0;
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for (int n = 0; n < draw_data->CmdListsCount; n++)
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{
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const ImDrawList* cmd_list = draw_data->CmdLists[n];
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for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
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{
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const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
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if (pcmd->UserCallback)
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{
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pcmd->UserCallback(cmd_list, pcmd);
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}
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else
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{
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const RECT r = { (LONG)pcmd->ClipRect.x, (LONG)pcmd->ClipRect.y, (LONG)pcmd->ClipRect.z, (LONG)pcmd->ClipRect.w };
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g_pd3dDevice->SetTexture(0, (LPDIRECT3DTEXTURE9)pcmd->TextureId);
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g_pd3dDevice->SetScissorRect(&r);
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g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, vtx_offset, 0, (UINT)cmd_list->VtxBuffer.Size, idx_offset, pcmd->ElemCount/3);
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}
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idx_offset += pcmd->ElemCount;
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}
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vtx_offset += cmd_list->VtxBuffer.Size;
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}
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// Restore the DX9 state
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d3d9_state_block->Apply();
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d3d9_state_block->Release();
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}
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bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
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{
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g_pd3dDevice = device;
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return true;
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}
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void ImGui_ImplDX9_Shutdown()
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{
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ImGui_ImplDX9_InvalidateDeviceObjects();
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g_pd3dDevice = NULL;
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}
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static bool ImGui_ImplDX9_CreateFontsTexture()
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{
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// Build texture atlas
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ImGuiIO& io = ImGui::GetIO();
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unsigned char* pixels;
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int width, height, bytes_per_pixel;
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io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &bytes_per_pixel);
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// Upload texture to graphics system
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g_FontTexture = NULL;
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if (g_pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &g_FontTexture, NULL) < 0)
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return false;
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D3DLOCKED_RECT tex_locked_rect;
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if (g_FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK)
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return false;
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for (int y = 0; y < height; y++)
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memcpy((unsigned char *)tex_locked_rect.pBits + tex_locked_rect.Pitch * y, pixels + (width * bytes_per_pixel) * y, (width * bytes_per_pixel));
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g_FontTexture->UnlockRect(0);
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// Store our identifier
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io.Fonts->TexID = (void *)g_FontTexture;
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return true;
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}
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bool ImGui_ImplDX9_CreateDeviceObjects()
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{
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if (!g_pd3dDevice)
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return false;
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if (!ImGui_ImplDX9_CreateFontsTexture())
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return false;
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return true;
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}
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void ImGui_ImplDX9_InvalidateDeviceObjects()
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{
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if (!g_pd3dDevice)
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return;
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if (g_pVB)
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{
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g_pVB->Release();
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g_pVB = NULL;
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}
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if (g_pIB)
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{
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g_pIB->Release();
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g_pIB = NULL;
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}
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// At this point note that we set ImGui::GetIO().Fonts->TexID to be == g_FontTexture, so clear both.
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(g_FontTexture == io.Fonts->TexID);
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if (g_FontTexture)
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g_FontTexture->Release();
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g_FontTexture = NULL;
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io.Fonts->TexID = NULL;
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}
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void ImGui_ImplDX9_NewFrame()
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{
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if (!g_FontTexture)
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ImGui_ImplDX9_CreateDeviceObjects();
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}
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