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Backends: SDL2: fixed querying framebuffer scale/density when using Metal. (#5592)

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ocornut
2026-08-06 18:28:23 +02:00
parent 6a6d7bc3ca
commit 724c69b182
3 changed files with 19 additions and 3 deletions
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13
backends/imgui_impl_sdl2.cpp
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@@ -21,6 +21,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-08-06: Fixed querying framebuffer scale when using Metal. (#5592)
// 2026-07-15: Inputs: restore SDL_StartTextInput()/SDL_StopTextInput() in IME handler for on-screen keyboard support on Android/mobile. (#7636, #9474)
// 2026-04-16: Made ImGui_ImplSDL2_GetContentScaleForWindow(), ImGui_ImplSDL2_GetContentScaleForDisplay() helpers return a minimum of 1.0f, as some Linux setup seems to report <1.0f value and this breaks scaling border size. (#9369)
// 2026-02-13: Inputs: systems other than X11 are back to starting mouse capture on mouse down (reverts 2025-02-26 change). Only X11 requires waiting for a drag by default (not ideal, but a better default for X11 users). Added ImGui_ImplSDL2_SetMouseCaptureMode() for X11 debugger users. (#3650, #6410, #9235)
@@ -135,10 +136,18 @@
#endif
#define SDL_HAS_PER_MONITOR_DPI SDL_VERSION_ATLEAST(2,0,4)
#define SDL_HAS_VULKAN SDL_VERSION_ATLEAST(2,0,6)
#if defined(__APPLE__)
#define SDL_HAS_METAL SDL_VERSION_ATLEAST(2,0,14)
#else
#define SDL_HAS_METAL 0
#endif
#define SDL_HAS_OPEN_URL SDL_VERSION_ATLEAST(2,0,14)
#if SDL_HAS_VULKAN
#include <SDL_vulkan.h>
#endif
#if SDL_HAS_METAL
#include <SDL_metal.h>
#endif
// SDL Data
struct ImGui_ImplSDL2_Data
@@ -899,6 +908,10 @@ static void ImGui_ImplSDL2_GetWindowSizeAndFramebufferScale(SDL_Window* window,
#if SDL_HAS_VULKAN
else if (SDL_GetWindowFlags(window) & SDL_WINDOW_VULKAN)
SDL_Vulkan_GetDrawableSize(window, &display_w, &display_h);
#endif
#if SDL_HAS_METAL
else if (SDL_GetWindowFlags(window) & SDL_WINDOW_METAL)
SDL_Metal_GetDrawableSize(window, &display_w, &display_h);
#endif
else
SDL_GL_GetDrawableSize(window, &display_w, &display_h);

1
docs/CHANGELOG.txt
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@@ -62,6 +62,7 @@ Other Changes:
- Circle and Curves tessellation error are scaled accordingly.
- Backends:
- QNX: added QNX Screen backend. (#9492) [@mgorchak-blackberry]
- SDL2: fixed querying framebuffer scale/density when using Metal. (#5592) [@lailoken]
- Examples:
- QNX+OpenGL3, QNX+Vulkan: added QNX Screen examples. (#9492) [@mgorchak-blackberry]

8
examples/example_sdl2_metal/main.mm
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@@ -56,13 +56,15 @@ int main(int, char**)
return 1;
}
// Inform SDL that we will be using metal for rendering. Without this hint initialization of metal renderer may fail.
// Inform SDL that we will be using metal for rendering. Without this hint initialization of Metal renderer may fail.
SDL_SetHint(SDL_HINT_RENDER_DRIVER, "metal");
// Enable native IME.
// From 2.0.18: Enable native IME.
#ifdef SDL_HINT_IME_SHOW_UI
SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
#endif
SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL+Metal example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 800, SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+Metal example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 800, SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
if (window == nullptr)
{
printf("Error creating window: %s\n", SDL_GetError());