Drezil/imgui
1
0
Fork 0
mirror of https://github.com/Drezil/imgui.git synced 2025-07-05 04:28:47 +02:00
Code Issues Packages Projects Releases Wiki Activity

Examples: refactor all examples with a MainLoopStep() function, to facilitate use with Emscripten. (#2492, #3699)

Browse Source 
Aligned all examples.
This commit is contained in:
ocornut
2023-02-02 16:27:33 +01:00
parent b51919dce1
commit 96ab68eee0
18 changed files with 1348 additions and 1178 deletions
Download Patch File Download Diff File Expand all files Collapse all files

209
examples/example_win32_directx12/main.cpp
View File

@ -48,6 +48,7 @@ static ID3D12Resource* g_mainRenderTargetResource[NUM_BACK_BUFFERS]
static D3D12_CPU_DESCRIPTOR_HANDLE g_mainRenderTargetDescriptor[NUM_BACK_BUFFERS] = {};
// Forward declarations of helper functions
bool MainLoopStep();
bool CreateDeviceD3D(HWND hWnd);
void CleanupDeviceD3D();
void CreateRenderTarget();
@ -111,112 +112,15 @@ int main(int, char**)
//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
//IM_ASSERT(font != NULL);
// Our state
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// Main loop
bool done = false;
while (!done)
while (true)
{
// Poll and handle messages (inputs, window resize, etc.)
// See the WndProc() function below for our to dispatch events to the Win32 backend.
MSG msg;
while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
if (msg.message == WM_QUIT)
done = true;
}
if (done)
if (!MainLoopStep())
break;
// Start the Dear ImGui frame
ImGui_ImplDX12_NewFrame();
ImGui_ImplWin32_NewFrame();
ImGui::NewFrame();
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
{
static float f = 0.0f;
static int counter = 0;
ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
counter++;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
ImGui::End();
}
// 3. Show another simple window.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// Rendering
ImGui::Render();
FrameContext* frameCtx = WaitForNextFrameResources();
UINT backBufferIdx = g_pSwapChain->GetCurrentBackBufferIndex();
frameCtx->CommandAllocator->Reset();
D3D12_RESOURCE_BARRIER barrier = {};
barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
barrier.Transition.pResource = g_mainRenderTargetResource[backBufferIdx];
barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
g_pd3dCommandList->Reset(frameCtx->CommandAllocator, NULL);
g_pd3dCommandList->ResourceBarrier(1, &barrier);
// Render Dear ImGui graphics
const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
g_pd3dCommandList->ClearRenderTargetView(g_mainRenderTargetDescriptor[backBufferIdx], clear_color_with_alpha, 0, NULL);
g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, NULL);
g_pd3dCommandList->SetDescriptorHeaps(1, &g_pd3dSrvDescHeap);
ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData(), g_pd3dCommandList);
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT;
g_pd3dCommandList->ResourceBarrier(1, &barrier);
g_pd3dCommandList->Close();
g_pd3dCommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&g_pd3dCommandList);
g_pSwapChain->Present(1, 0); // Present with vsync
//g_pSwapChain->Present(0, 0); // Present without vsync
UINT64 fenceValue = g_fenceLastSignaledValue + 1;
g_pd3dCommandQueue->Signal(g_fence, fenceValue);
g_fenceLastSignaledValue = fenceValue;
frameCtx->FenceValue = fenceValue;
}
WaitForLastSubmittedFrame();
// Cleanup
WaitForLastSubmittedFrame();
ImGui_ImplDX12_Shutdown();
ImGui_ImplWin32_Shutdown();
ImGui::DestroyContext();
@ -228,6 +132,111 @@ int main(int, char**)
return 0;
}
bool MainLoopStep()
{
// Poll and handle messages (inputs, window resize, etc.)
// See the WndProc() function below where we dispatch events to the imgui_impl_win32 backend.
bool done = false;
MSG msg;
while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
if (msg.message == WM_QUIT)
done = true;
}
if (done)
return false;
// Start the Dear ImGui frame
ImGui_ImplDX12_NewFrame();
ImGui_ImplWin32_NewFrame();
ImGui::NewFrame();
// Our state
// (we use static, which essentially makes the variable globals, as a convenience to keep the example code easy to follow)
static bool show_demo_window = true;
static bool show_another_window = false;
static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
{
static float f = 0.0f;
static int counter = 0;
ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
ImGui::Text("This is some useful text."); // Display some text (you can use a format strings too)
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
if (ImGui::Button("Button")) // Buttons return true when clicked (most widgets return true when edited/activated)
counter++;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
ImGui::End();
}
// 3. Show another simple window.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// Rendering
ImGui::Render();
FrameContext* frameCtx = WaitForNextFrameResources();
UINT backBufferIdx = g_pSwapChain->GetCurrentBackBufferIndex();
frameCtx->CommandAllocator->Reset();
D3D12_RESOURCE_BARRIER barrier = {};
barrier.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
barrier.Flags = D3D12_RESOURCE_BARRIER_FLAG_NONE;
barrier.Transition.pResource = g_mainRenderTargetResource[backBufferIdx];
barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_RENDER_TARGET;
g_pd3dCommandList->Reset(frameCtx->CommandAllocator, NULL);
g_pd3dCommandList->ResourceBarrier(1, &barrier);
// Render Dear ImGui graphics
const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
g_pd3dCommandList->ClearRenderTargetView(g_mainRenderTargetDescriptor[backBufferIdx], clear_color_with_alpha, 0, NULL);
g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, NULL);
g_pd3dCommandList->SetDescriptorHeaps(1, &g_pd3dSrvDescHeap);
ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData(), g_pd3dCommandList);
barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_PRESENT;
g_pd3dCommandList->ResourceBarrier(1, &barrier);
g_pd3dCommandList->Close();
g_pd3dCommandQueue->ExecuteCommandLists(1, (ID3D12CommandList* const*)&g_pd3dCommandList);
g_pSwapChain->Present(1, 0); // Present with vsync
//g_pSwapChain->Present(0, 0); // Present without vsync
UINT64 fenceValue = g_fenceLastSignaledValue + 1;
g_pd3dCommandQueue->Signal(g_fence, fenceValue);
g_fenceLastSignaledValue = fenceValue;
frameCtx->FenceValue = fenceValue;
return true;
}
// Helper functions
bool CreateDeviceD3D(HWND hWnd)