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The open source OpenXR runtime
u/debug_gui: Properly scale ImGui interface to match the display DPI
Make it easy to read on 4K screens.
Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2430>
authored by
Aleksander
and committed by
Marge Bot
3c3587a5
a2087886
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-1
src/xrt/auxiliary/util/u_debug_gui.c
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src/xrt/auxiliary/util/u_debug_gui.c
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* @author Moshi Turner <moshiturner@protonmail.com>
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*/
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#include "math/m_api.h"
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#include "xrt/xrt_system.h"
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#include "xrt/xrt_instance.h"
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#include "xrt/xrt_config_build.h"
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bool sdl_initialized;
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char layout_file[1024];
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float gui_scale;
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#ifdef XRT_BUILD_DRIVER_QWERTY
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bool qwerty_enabled;
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#endif
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// Start the scene.
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gui_scene_debug(&p->base);
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// Set imgui interface scale percentage
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p->gui_scale = 1.0f; // Fallback (default) value
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int disp_idx = SDL_GetWindowDisplayIndex(p->win);
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if (disp_idx >= 0) {
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float dpi;
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if (SDL_GetDisplayDPI(disp_idx, &dpi, NULL, NULL) >= 0) {
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// 96.0f is the base 100% GUI scale reported by SDL2
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p->gui_scale = CLAMP(dpi / 96.0f, 1.0f, 3.0f); // up to 300%
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}
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}
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}
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static void
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// Local state
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ImGuiIO *io = igGetIO();
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io->FontGlobalScale = p->gui_scale;
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// Make window layout file "imgui.ini" live in config dir
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XRT_MAYBE_UNUSED int res = u_file_get_path_in_config_dir("imgui.ini", p->layout_file, sizeof(p->layout_file));
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ImGui_ImplOpenGL3_Init(NULL);
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// Setup Dear ImGui style
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igStyleColorsDark(NULL);
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ImGuiStyle *style = igGetStyle();
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ImGuiStyle_ScaleAllSizes(style, p->gui_scale);
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igStyleColorsDark(style);
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// Setup the plot context.
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ImPlotContext *plot_ctx = ImPlot_CreateContext();