Applying RAII types

1 files changed, 54 insertions, 0 deletions

diff --git a/src/sdl_context.cpp b/src/sdl_context.cpp
new file mode 100644
index 0000000..f52bbe9
--- /dev/null
+++ b/src/sdl_context.cpp
@@ -0,0 +1,54 @@
+#include "sdl_context.hpp"
+
+#include <SDL.h>
+#include <cassert>
+#include <stdexcept>
+
+namespace bookmouse {
+
+SdlContext::SdlContext() {
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0) {
+        const auto* lastError = SDL_GetError();
+        throw std::runtime_error{lastError};
+    }
+
+    // Decide GL+GLSL versions
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+    // GL ES 2.0 + GLSL 100
+    setAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+    setAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+    setAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+    setAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#elif defined(__APPLE__)
+    // GL 3.2 Core + GLSL 150
+    setAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
+    setAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    setAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    setAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+#else
+    // GL 3.0 + GLSL 130
+    setAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+    setAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    setAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    setAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#endif
+
+    // From 2.0.18: Enable native IME.
+#ifdef SDL_HINT_IME_SHOW_UI
+    auto hintSet = SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
+    assert(hintSet == SDL_TRUE);
+#endif
+}
+
+SdlContext::~SdlContext() {
+    SDL_Quit();
+}
+
+int SdlContext::setAttribute(SDL_GLattr attr, int value) const
+{
+    auto result = SDL_GL_SetAttribute(attr, value);
+    assert(result == 0);
+    return result;
+}
+
+} // namespace bookmouse