spicetools/overlay/imgui/impl_dx9.cpp

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2024-08-28 15:10:34 +00:00
// dear imgui: Renderer for DirectX9
// This needs to be used along with a Platform Binding (e.g. Win32)
// Implemented features:
// [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' 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)
// 2019-05-29: DirectX9: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
// 2019-04-30: DirectX9: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
// 2019-03-29: Misc: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects().
// 2019-01-16: Misc: Disabled fog before drawing UI's. Fixes issue #2288.
// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
// 2018-06-08: Misc: Extracted imgui_impl_dx9.cpp/.h away from the old combined DX9+Win32 example.
// 2018-06-08: DirectX9: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
// 2018-05-07: Render: Saving/restoring Transform because they don't seem to be included in the StateBlock. Setting shading mode to Gouraud.
// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX9_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.
#include "impl_dx9.h"
#include <algorithm>
// DirectX
#include <d3d9.h>
#include "external/imgui/imgui.h"
// allow std::min use
#ifdef min
#undef min
#endif
// DirectX data
static LPDIRECT3DDEVICE9 g_pd3dDevice = NULL;
static LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL;
static LPDIRECT3DINDEXBUFFER9 g_pIB = NULL;
static LPDIRECT3DTEXTURE9 g_FontTexture = NULL;
static int g_VertexBufferSize = 5000, g_IndexBufferSize = 10000;
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
// 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_ImplDX9_RenderDrawData(ImDrawData *draw_data) {
// Avoid rendering when minimized
if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
return;
// Create and grow 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;
if (g_pd3dDevice->CreateVertexBuffer(g_VertexBufferSize * sizeof(ImDrawVert),
D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX,
D3DPOOL_DEFAULT, &g_pVB, NULL) < 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;
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)
return;
}
// Backup the DX9 state
IDirect3DStateBlock9 *d3d9_state_block = NULL;
if (g_pd3dDevice->CreateStateBlock(D3DSBT_ALL, &d3d9_state_block) < 0)
return;
// Backup the DX9 transform (DX9 documentation suggests that it is included in the StateBlock but it doesn't appear to)
D3DMATRIX last_world, last_view, last_projection;
g_pd3dDevice->GetTransform(D3DTS_WORLD, &last_world);
g_pd3dDevice->GetTransform(D3DTS_VIEW, &last_view);
g_pd3dDevice->GetTransform(D3DTS_PROJECTION, &last_projection);
// Copy all vertices into a single contiguous buffer
ImDrawVert *vtx_dst;
ImDrawIdx *idx_dst;
if (g_pVB->Lock(0, (UINT) (draw_data->TotalVtxCount * sizeof(ImDrawVert)), (void **) &vtx_dst,
D3DLOCK_DISCARD) < 0)
return;
if (g_pIB->Lock(0, (UINT) (draw_data->TotalIdxCount * sizeof(ImDrawIdx)), (void **) &idx_dst,
D3DLOCK_DISCARD) < 0)
return;
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;
}
g_pVB->Unlock();
g_pIB->Unlock();
g_pd3dDevice->SetStreamSource(0, g_pVB, 0, sizeof(ImDrawVert));
g_pd3dDevice->SetIndices(g_pIB);
g_pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
// Setup viewport
D3DVIEWPORT9 vp;
vp.X = vp.Y = 0;
vp.Width = (DWORD) draw_data->DisplaySize.x;
vp.Height = (DWORD) draw_data->DisplaySize.y;
vp.MinZ = 0.0f;
vp.MaxZ = 1.0f;
g_pd3dDevice->SetViewport(&vp);
g_pd3dDevice->SetPixelShader(nullptr);
g_pd3dDevice->SetVertexShader(nullptr);
D3DCAPS9 caps {};
if (FAILED(g_pd3dDevice->GetDeviceCaps(&caps))) {
caps.NumSimultaneousRTs = 0UL;
}
IDirect3DSurface9 *back_buffer = nullptr;
IDirect3DSurface9 *depth_stencil = nullptr;
IDirect3DSurface9 *render_targets[8];
// save all previous render target state
for (size_t target = 0; target < std::min(8UL, caps.NumSimultaneousRTs); target++) {
if (FAILED(g_pd3dDevice->GetRenderTarget(target, &render_targets[target]))) {
render_targets[target] = nullptr;
}
}
// get the previous depth stencil
if (FAILED(g_pd3dDevice->GetDepthStencilSurface(&depth_stencil))) {
depth_stencil = nullptr;
}
// set the back buffer as the current render target
if (SUCCEEDED(g_pd3dDevice->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &back_buffer))) {
g_pd3dDevice->SetRenderTarget(0, back_buffer);
g_pd3dDevice->SetDepthStencilSurface(nullptr);
for (size_t target = 1; target < std::min(8UL, caps.NumSimultaneousRTs); target++) {
g_pd3dDevice->SetRenderTarget(target, nullptr);
}
} else {
back_buffer = nullptr;
}
// Setup render state: fixed-pipeline, alpha-blending, no face culling, no depth testing, shade mode (for gradient)
g_pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
g_pd3dDevice->SetRenderState(D3DRS_LIGHTING, false);
g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, false);
g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
g_pd3dDevice->SetRenderState(D3DRS_ALPHATESTENABLE, false);
g_pd3dDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_ADD);
g_pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
g_pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, true);
g_pd3dDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_GOURAUD);
g_pd3dDevice->SetRenderState(D3DRS_FOGENABLE, false);
g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);
g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
g_pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
// Setup orthographic projection matrix
// 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.
// Being agnostic of whether <d3dx9.h> or <DirectXMath.h> can be used, we aren't relying on D3DXMatrixIdentity()/D3DXMatrixOrthoOffCenterLH() or DirectX::XMMatrixIdentity()/DirectX::XMMatrixOrthographicOffCenterLH()
{
float L = draw_data->DisplayPos.x + 0.5f;
float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x + 0.5f;
float T = draw_data->DisplayPos.y + 0.5f;
float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y + 0.5f;
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}}};
D3DMATRIX mat_projection =
{{{
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,
(L + R) / (L - R), (T + B) / (B - T), 0.5f, 1.0f
}}};
g_pd3dDevice->SetTransform(D3DTS_WORLD, &mat_identity);
g_pd3dDevice->SetTransform(D3DTS_VIEW, &mat_identity);
g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat_projection);
}
// Render command lists
// (Because we merged all buffers into a single one, we maintain our own offset into them)
int global_vtx_offset = 0;
int global_idx_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) {
pcmd->UserCallback(cmd_list, pcmd);
} else {
const 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)};
auto texture = reinterpret_cast<IDirect3DBaseTexture9 *>(pcmd->TextureId);
g_pd3dDevice->SetTexture(0, texture);
g_pd3dDevice->SetScissorRect(&r);
g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,
pcmd->VtxOffset + global_vtx_offset, 0,
(UINT) cmd_list->VtxBuffer.Size,
pcmd->IdxOffset + global_idx_offset, pcmd->ElemCount / 3);
}
}
global_idx_offset += cmd_list->IdxBuffer.Size;
global_vtx_offset += cmd_list->VtxBuffer.Size;
}
if (back_buffer) {
back_buffer->Release();
back_buffer = nullptr;
}
// restore previous depth stencil
if (depth_stencil) {
g_pd3dDevice->SetDepthStencilSurface(depth_stencil);
depth_stencil->Release();
depth_stencil = nullptr;
}
// restore all render target state
for (size_t target = 0; target < std::min(8UL, caps.NumSimultaneousRTs); target++) {
auto render_target = render_targets[target];
if (render_target) {
g_pd3dDevice->SetRenderTarget(target, render_target);
render_target->Release();
}
}
// restore the DX9 transform
g_pd3dDevice->SetTransform(D3DTS_WORLD, &last_world);
g_pd3dDevice->SetTransform(D3DTS_VIEW, &last_view);
g_pd3dDevice->SetTransform(D3DTS_PROJECTION, &last_projection);
// restore the DX9 state
d3d9_state_block->Apply();
d3d9_state_block->Release();
}
bool ImGui_ImplDX9_Init(IDirect3DDevice9 *device) {
// Setup back-end capabilities flags
auto &io = ImGui::GetIO();
io.BackendRendererName = "imgui_impl_dx9";
// We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;
g_pd3dDevice = device;
g_pd3dDevice->AddRef();
return true;
}
void ImGui_ImplDX9_Shutdown() {
ImGui_ImplDX9_InvalidateDeviceObjects();
if (g_pd3dDevice) {
g_pd3dDevice->Release();
g_pd3dDevice = NULL;
}
}
static bool ImGui_ImplDX9_CreateFontsTexture() {
// Build texture atlas
ImGuiIO &io = ImGui::GetIO();
unsigned char *pixels;
int width, height, bytes_per_pixel;
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &bytes_per_pixel);
// Upload texture to graphics system
g_FontTexture = NULL;
if (g_pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8,
D3DPOOL_DEFAULT, &g_FontTexture, NULL) < 0)
return false;
D3DLOCKED_RECT tex_locked_rect;
if (g_FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK)
return false;
for (int y = 0; y < height; y++)
memcpy((unsigned char *) tex_locked_rect.pBits + tex_locked_rect.Pitch * y,
pixels + (width * bytes_per_pixel) * y, (width * bytes_per_pixel));
g_FontTexture->UnlockRect(0);
// Store our identifier
io.Fonts->TexID = (ImTextureID) g_FontTexture;
return true;
}
bool ImGui_ImplDX9_CreateDeviceObjects() {
if (!g_pd3dDevice) {
return false;
}
return ImGui_ImplDX9_CreateFontsTexture();
}
void ImGui_ImplDX9_InvalidateDeviceObjects() {
if (!g_pd3dDevice)
return;
if (g_pVB) {
g_pVB->Release();
g_pVB = NULL;
}
if (g_pIB) {
g_pIB->Release();
g_pIB = NULL;
}
if (g_FontTexture) {
g_FontTexture->Release();
g_FontTexture = NULL;
ImGui::GetIO().Fonts->TexID = NULL;
} // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
}
void ImGui_ImplDX9_NewFrame() {
if (!g_FontTexture) {
ImGui_ImplDX9_CreateDeviceObjects();
}
IDirect3DSwapChain9 *swap_chain = nullptr;
if (SUCCEEDED(g_pd3dDevice->GetSwapChain(0, &swap_chain))) {
auto &io = ImGui::GetIO();
D3DPRESENT_PARAMETERS present_params {};
if (SUCCEEDED(swap_chain->GetPresentParameters(&present_params))) {
if (present_params.BackBufferWidth != 0 && present_params.BackBufferHeight != 0) {
io.DisplaySize.x = static_cast<float>(present_params.BackBufferWidth);
io.DisplaySize.y = static_cast<float>(present_params.BackBufferHeight);
} else {
RECT rect {};
GetClientRect(present_params.hDeviceWindow, &rect);
io.DisplaySize.x = static_cast<float>(rect.right - rect.left);
io.DisplaySize.y = static_cast<float>(rect.bottom - rect.top);
}
}
swap_chain->Release();
}
}