From ec7b3079a7ae6035154cd150d6e16255461aaf51 Mon Sep 17 00:00:00 2001
From: Zachary Hall <catmeow72@proton.me>
Date: Sun, 16 Jul 2023 12:06:03 -0700
Subject: [PATCH] Use OpenGL ES and disable VSync by default to run on
 Raspberry Pis.

---
 main.cpp    | 15 +++++++++++++--
 meson.build |  1 +
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/main.cpp b/main.cpp
index 9641a33..0426842 100644
--- a/main.cpp
+++ b/main.cpp
@@ -126,7 +126,7 @@ int main(int, char**)
     SDL_SetWindowIcon(window, icon);
     SDL_GLContext gl_context = SDL_GL_CreateContext(window);
     SDL_GL_MakeCurrent(window, gl_context);
-    SDL_GL_SetSwapInterval(1); // Enable vsync
+    SDL_GL_SetSwapInterval(0); // Enable vsync
 
     // Setup Dear ImGui context
     IMGUI_CHECKVERSION();
@@ -194,6 +194,7 @@ int main(int, char**)
     bool prefs_window = false;
     bool theme_editor = false;
     bool stopped = true;
+    bool vsync = false;
     {
         Json::Value config;
         std::ifstream stream;
@@ -213,6 +214,10 @@ int main(int, char**)
             if (config.isMember("demo_window")) {
                 show_demo_window = config["demo_window"].asBool();
             }
+            if (config.isMember("vsync")) {
+                vsync = config["vsync"].asBool();
+                SDL_GL_SetSwapInterval(vsync ? 1 : 0);
+            }
             stream.close();
         } 
         if (is_empty(Theme::themeDir)) {
@@ -228,6 +233,7 @@ int main(int, char**)
             }
         }
     }
+    theme->Apply(accent_color);
 #ifdef __EMSCRIPTEN__
     // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
     // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
@@ -349,6 +355,9 @@ int main(int, char**)
             ImGui::SetNextWindowSizeConstraints(min_size, max_size);
             ImGui::Begin("Preferences...", &prefs_window);
             {
+                if (ImGui::Checkbox("Enable VSync", &vsync)) {
+                    SDL_GL_SetSwapInterval(vsync ? 1 : 0);
+                }
                 if (ImGui::Button(ICON_FK_MAGIC "Theme Editor", ImVec2(ImGui::GetWindowWidth() - (ImGui::GetStyle().WindowPadding.x * 2.0f), 0))) {
                     theme_editor = true;
                 }
@@ -364,6 +373,7 @@ int main(int, char**)
                             if (ImGui::Selectable(themePath.stem().c_str(), is_selected)) {
                                 delete theme;
                                 theme = new Theme(themePath);
+                                theme->Apply(accent_color);
                                 break;
                             }
                             if (is_selected) {
@@ -380,8 +390,8 @@ int main(int, char**)
         }
         if (theme_editor) {
             Theme::ShowEditor(&theme_editor, theme);
+            theme->Apply(accent_color);
         }
-        theme->Apply(accent_color);
         fileDialog.Display();
 
         if (fileDialog.HasSelected()) {
@@ -439,6 +449,7 @@ int main(int, char**)
         }
         config["accent_color"] = accent_color;
         config["demo_window"] = show_demo_window;
+        config["vsync"] = vsync;
         stream << config;
         stream.close();
     }
diff --git a/meson.build b/meson.build
index 5db5c6b..00166e4 100644
--- a/meson.build
+++ b/meson.build
@@ -6,6 +6,7 @@ cmake = import('cmake')
 if get_option('debug')
   add_global_arguments('-DDEBUG', language: 'cpp')
 endif
+add_global_arguments('-DIMGUI_IMPL_OPENGL_ES2', language: 'cpp')
 smx_opts = cmake.subproject_options()
 smx_opts.add_cmake_defines({'SDL_MIXER_X_STATIC': true, 'SDL_MIXER_X_SHARED': false}) 
 smx_opts.set_override_option('c_std', 'c99')