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Examples: DirectX9: Force a redraw in the resize loop #6461

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Examples: DirectX9: Force a redraw in the resize loop #6461

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170 changes: 96 additions & 74 deletions examples/example_win32_directx9/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,13 +13,95 @@ static LPDIRECT3D9 g_pD3D = nullptr;
static LPDIRECT3DDEVICE9 g_pd3dDevice = nullptr;
static UINT g_ResizeWidth = 0, g_ResizeHeight = 0;
static D3DPRESENT_PARAMETERS g_d3dpp = {};
static bool g_ResizingWindow = false;

// Forward declarations of helper functions
bool CreateDeviceD3D(HWND hWnd);
void CleanupDeviceD3D();
void ResetDevice();
LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

static void HandleImGuiFrame()
{
// Our state
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);

ImGuiIO& io = ImGui::GetIO(); (void)io;

// Handle window resize (we don't resize directly in the WM_SIZE handler)
if (g_ResizeWidth != 0 && g_ResizeHeight != 0)
{
g_d3dpp.BackBufferWidth = g_ResizeWidth;
g_d3dpp.BackBufferHeight = g_ResizeHeight;
g_ResizeWidth = g_ResizeHeight = 0;
ResetDevice();
}

// Start the Dear ImGui frame
ImGui_ImplDX9_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 / io.Framerate, io.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::EndFrame();
g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE);
g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, FALSE);
D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x * clear_color.w * 255.0f), (int)(clear_color.y * clear_color.w * 255.0f), (int)(clear_color.z * clear_color.w * 255.0f), (int)(clear_color.w * 255.0f));
g_pd3dDevice->Clear(0, nullptr, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, clear_col_dx, 1.0f, 0);
if (g_pd3dDevice->BeginScene() >= 0)
{
ImGui::Render();
ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());
g_pd3dDevice->EndScene();
}
HRESULT result = g_pd3dDevice->Present(nullptr, nullptr, nullptr, nullptr);

// Handle loss of D3D9 device
if (result == D3DERR_DEVICELOST && g_pd3dDevice->TestCooperativeLevel() == D3DERR_DEVICENOTRESET)
ResetDevice();

}

// Main code
int main(int, char**)
{
Expand Down Expand Up @@ -72,11 +154,6 @@ int main(int, char**)
//ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
//IM_ASSERT(font != nullptr);

// 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)
Expand All @@ -94,75 +171,7 @@ int main(int, char**)
if (done)
break;

// Handle window resize (we don't resize directly in the WM_SIZE handler)
if (g_ResizeWidth != 0 && g_ResizeHeight != 0)
{
g_d3dpp.BackBufferWidth = g_ResizeWidth;
g_d3dpp.BackBufferHeight = g_ResizeHeight;
g_ResizeWidth = g_ResizeHeight = 0;
ResetDevice();
}

// Start the Dear ImGui frame
ImGui_ImplDX9_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 / io.Framerate, io.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::EndFrame();
g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE);
g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, FALSE);
D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x*clear_color.w*255.0f), (int)(clear_color.y*clear_color.w*255.0f), (int)(clear_color.z*clear_color.w*255.0f), (int)(clear_color.w*255.0f));
g_pd3dDevice->Clear(0, nullptr, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, clear_col_dx, 1.0f, 0);
if (g_pd3dDevice->BeginScene() >= 0)
{
ImGui::Render();
ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());
g_pd3dDevice->EndScene();
}
HRESULT result = g_pd3dDevice->Present(nullptr, nullptr, nullptr, nullptr);

// Handle loss of D3D9 device
if (result == D3DERR_DEVICELOST && g_pd3dDevice->TestCooperativeLevel() == D3DERR_DEVICENOTRESET)
ResetDevice();
HandleImGuiFrame();
}

ImGui_ImplDX9_Shutdown();
Expand Down Expand Up @@ -233,6 +242,12 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
return 0;
g_ResizeWidth = (UINT)LOWORD(lParam); // Queue resize
g_ResizeHeight = (UINT)HIWORD(lParam);

// The user is resizing the window, which mains our main function will be blocked on DispatchMessage until the resizing is done
// Because we want to re-draw everything while the user is dragging, we respond to move events
if (g_ResizingWindow)
HandleImGuiFrame();

return 0;
case WM_SYSCOMMAND:
if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu
Expand All @@ -241,6 +256,13 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
case WM_DESTROY:
::PostQuitMessage(0);
return 0;
case WM_ENTERSIZEMOVE:
g_ResizingWindow = true;
return 0;
case WM_EXITSIZEMOVE:
case WM_CAPTURECHANGED:
g_ResizingWindow = false;
break;
}
return ::DefWindowProcW(hWnd, msg, wParam, lParam);
}