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Examples: DPI awareness on Win32 OpenGL

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This commit is contained in:
Soph 2025-11-20 04:30:44 +00:00
parent 4ab86e1d61
commit 10fca0e8b1
3 changed files with 39 additions and 11 deletions
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8
backends/imgui_impl_win32.cpp
View file

@ -858,17 +858,17 @@ DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
#endif
typedef HRESULT(WINAPI* PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS); // Shcore.lib + dll, Windows 8.1+
typedef HRESULT(WINAPI* PFN_GetDpiForMonitor)(HMONITOR, MONITOR_DPI_TYPE, UINT*, UINT*); // Shcore.lib + dll, Windows 8.1+
typedef DPI_AWARENESS_CONTEXT(WINAPI* PFN_SetThreadDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
typedef BOOL(WINAPI* PFN_SetProcessDpiAwarenessContext)(DPI_AWARENESS_CONTEXT); // User32.lib + dll, Windows 10 v1607+ (Creators Update)
// Helper function to enable DPI awareness without setting up a manifest
void ImGui_ImplWin32_EnableDpiAwareness()
{
if (_IsWindows10OrGreater())
{
static HINSTANCE user32_dll = ::LoadLibraryA("user32.dll"); // Reference counted per-process
if (PFN_SetThreadDpiAwarenessContext SetThreadDpiAwarenessContextFn = (PFN_SetThreadDpiAwarenessContext)::GetProcAddress(user32_dll, "SetThreadDpiAwarenessContext"))
if (PFN_SetProcessDpiAwarenessContext SetProcessDpiAwarenessContext = (PFN_SetProcessDpiAwarenessContext)::GetProcAddress(user32_dll, "SetProcessDpiAwarenessContext"))
{
SetThreadDpiAwarenessContextFn(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setprocessdpiawarenesscontext
SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
return;
}
}

38
examples/example_win32_opengl3/example_win32_opengl3.vcxproj
View file

@ -21,34 +21,34 @@
<PropertyGroup Label="Globals">
<ProjectGuid>{C624E5FF-D4FE-4D35-9164-B8A91864F98E}</ProjectGuid>
<RootNamespace>example_win32_opengl2</RootNamespace>
<WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
<WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<CharacterSet>Unicode</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
<PlatformToolset>v143</PlatformToolset>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<CharacterSet>Unicode</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
<PlatformToolset>v143</PlatformToolset>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>Unicode</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
<PlatformToolset>v143</PlatformToolset>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>Unicode</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
<PlatformToolset>v143</PlatformToolset>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
<ImportGroup Label="ExtensionSettings">
@ -69,18 +69,22 @@
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<EmbedManifest>true</EmbedManifest>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<EmbedManifest>true</EmbedManifest>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<EmbedManifest>true</EmbedManifest>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<EmbedManifest>true</EmbedManifest>
</PropertyGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile>
@ -95,6 +99,9 @@
<AdditionalDependencies>opengl32.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
</Link>
<Manifest>
<EnableDpiAwareness>PerMonitorHighDPIAware</EnableDpiAwareness>
</Manifest>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<ClCompile>
@ -109,6 +116,9 @@
<AdditionalDependencies>opengl32.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
</Link>
<Manifest>
<EnableDpiAwareness>PerMonitorHighDPIAware</EnableDpiAwareness>
</Manifest>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile>
@ -128,6 +138,15 @@
<AdditionalDependencies>opengl32.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
</Link>
<Manifest>
<EnableDpiAwareness>PerMonitorHighDPIAware</EnableDpiAwareness>
<OutputManifestFile>
</OutputManifestFile>
</Manifest>
<ManifestResourceCompile>
<ResourceOutputFileName>
</ResourceOutputFileName>
</ManifestResourceCompile>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<ClCompile>
@ -147,6 +166,15 @@
<AdditionalDependencies>opengl32.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
</Link>
<Manifest>
<EnableDpiAwareness>PerMonitorHighDPIAware</EnableDpiAwareness>
<OutputManifestFile>
</OutputManifestFile>
</Manifest>
<ManifestResourceCompile>
<ResourceOutputFileName>
</ResourceOutputFileName>
</ManifestResourceCompile>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="..\..\imgui.cpp" />

4
examples/example_win32_opengl3/main.cpp
View file

@ -30,14 +30,14 @@ static int g_Height;
// Forward declarations of helper functions
bool CreateDeviceWGL(HWND hWnd, WGL_WindowData* data);
void CleanupDeviceWGL(HWND hWnd, WGL_WindowData* data);
void ResetDeviceWGL();
LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
// Main code
int main(int, char**)
{
// Make process DPI aware and obtain main monitor scale
//ImGui_ImplWin32_EnableDpiAwareness(); // FIXME: This somehow doesn't work in the Win32+OpenGL example. Why?
// https://learn.microsoft.com/en-us/windows/win32/hidpi/setting-the-default-dpi-awareness-for-a-process
// ImGui_ImplWin32_EnableDpiAwareness(); // This is already set in the manifest so the call will fail, but leaving it for completeness.
float main_scale = ImGui_ImplWin32_GetDpiScaleForMonitor(::MonitorFromPoint(POINT{ 0, 0 }, MONITOR_DEFAULTTOPRIMARY));
// Create application window