Frontends, VideoCore: Move glad initialisation to the frontend

On SDL2 this allows it to use SDL_GL_GetProcAddress() instead of the
default function loader, and fixes a crash when using apitrace with an
EGL context.

On Qt we will need to migrate from QGLWidget to QOpenGLWidget and
QOpenGLContext before we can use gladLoadGLLoader() instead of
gladLoadGL(), since the former doesn’t expose a function loader.

3 files changed, 18 insertions, 6 deletions

diff --git a/src/citra/emu_window/emu_window_sdl2.cpp b/src/citra/emu_window/emu_window_sdl2.cpp
index 924189f4c..12cdd9d95 100644
--- a/src/citra/emu_window/emu_window_sdl2.cpp
+++ b/src/citra/emu_window/emu_window_sdl2.cpp
@@ -9,6 +9,8 @@
 #define SDL_MAIN_HANDLED
 #include <SDL.h>
 
+#include <glad/glad.h>
+
 #include "common/key_map.h"
 #include "common/logging/log.h"
 #include "common/scm_rev.h"
@@ -98,6 +100,11 @@ EmuWindow_SDL2::EmuWindow_SDL2() {
         exit(1);
     }
 
+    if (!gladLoadGLLoader(static_cast<GLADloadproc>(SDL_GL_GetProcAddress))) {
+        LOG_CRITICAL(Frontend, "Failed to initialize GL functions! Exiting...");
+        exit(1);
+    }
+
     OnResize();
     OnMinimalClientAreaChangeRequest(GetActiveConfig().min_client_area_size);
     SDL_PumpEvents();
diff --git a/src/citra_qt/main.cpp b/src/citra_qt/main.cpp
index f1ab29755..a85c94a4b 100644
--- a/src/citra_qt/main.cpp
+++ b/src/citra_qt/main.cpp
@@ -6,6 +6,9 @@
 #include <memory>
 #include <thread>
 
+#include <glad/glad.h>
+
+#define QT_NO_OPENGL
 #include <QDesktopWidget>
 #include <QtGui>
 #include <QFileDialog>
@@ -240,6 +243,14 @@ bool GMainWindow::InitializeSystem() {
     if (emu_thread != nullptr)
         ShutdownGame();
 
+    render_window->MakeCurrent();
+    if (!gladLoadGL()) {
+        QMessageBox::critical(this, tr("Error while starting Citra!"),
+                              tr("Failed to initialize the video core!\n\n"
+                                 "Please ensure that your GPU supports OpenGL 3.3 and that you have the latest graphics driver."));
+        return false;
+    }
+
     // Initialize the core emulation
     System::Result system_result = System::Init(render_window);
     if (System::Result::Success != system_result) {
diff --git a/src/video_core/renderer_opengl/renderer_opengl.cpp b/src/video_core/renderer_opengl/renderer_opengl.cpp
index 0e9a0be8b..7fcd36409 100644
--- a/src/video_core/renderer_opengl/renderer_opengl.cpp
+++ b/src/video_core/renderer_opengl/renderer_opengl.cpp
@@ -473,12 +473,6 @@ static void DebugHandler(GLenum source, GLenum type, GLuint id, GLenum severity,
 bool RendererOpenGL::Init() {
     render_window->MakeCurrent();
 
-    // TODO: Make frontends initialize this, so they can use gladLoadGLLoader with their own loaders
-    if (!gladLoadGL()) {
-        LOG_CRITICAL(Render_OpenGL, "Failed to initialize GL functions! Exiting...");
-        exit(-1);
-    }
-
     if (GLAD_GL_KHR_debug) {
         glEnable(GL_DEBUG_OUTPUT);
         glDebugMessageCallback(DebugHandler, nullptr);