yuzu_tester: Add SDL2-based EmuWindow that doesn't show the window

src/yuzu_tester/emu_window/emu_window_sdl2_hide.cpp

+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <cstdlib>
+#include <string>
+#define SDL_MAIN_HANDLED
+#include <SDL.h>
+#include <fmt/format.h>
+#include <glad/glad.h>
+#include "common/logging/log.h"
+#include "common/scm_rev.h"
+#include "core/settings.h"
+#include "input_common/main.h"
+#include "yuzu_tester/emu_window/emu_window_sdl2_hide.h"
+
+bool EmuWindow_SDL2_Hide::SupportsRequiredGLExtensions() {
+    std::vector<std::string> unsupported_ext;
+
+    if (!GLAD_GL_ARB_direct_state_access)
+        unsupported_ext.push_back("ARB_direct_state_access");
+    if (!GLAD_GL_ARB_vertex_type_10f_11f_11f_rev)
+        unsupported_ext.push_back("ARB_vertex_type_10f_11f_11f_rev");
+    if (!GLAD_GL_ARB_texture_mirror_clamp_to_edge)
+        unsupported_ext.push_back("ARB_texture_mirror_clamp_to_edge");
+    if (!GLAD_GL_ARB_multi_bind)
+        unsupported_ext.push_back("ARB_multi_bind");
+
+    // Extensions required to support some texture formats.
+    if (!GLAD_GL_EXT_texture_compression_s3tc)
+        unsupported_ext.push_back("EXT_texture_compression_s3tc");
+    if (!GLAD_GL_ARB_texture_compression_rgtc)
+        unsupported_ext.push_back("ARB_texture_compression_rgtc");
+    if (!GLAD_GL_ARB_depth_buffer_float)
+        unsupported_ext.push_back("ARB_depth_buffer_float");
+
+    for (const std::string& ext : unsupported_ext)
+        LOG_CRITICAL(Frontend, "Unsupported GL extension: {}", ext);
+
+    return unsupported_ext.empty();
+}
+
+EmuWindow_SDL2_Hide::EmuWindow_SDL2_Hide() {
+    // Initialize the window
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        LOG_CRITICAL(Frontend, "Failed to initialize SDL2! Exiting...");
+        exit(1);
+    }
+
+    InputCommon::Init();
+
+    SDL_SetMainReady();
+
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 0);
+
+    std::string window_title = fmt::format("yuzu-tester {} | {}-{}", Common::g_build_fullname,
+                                           Common::g_scm_branch, Common::g_scm_desc);
+    render_window =
+        SDL_CreateWindow(window_title.c_str(),
+                         SDL_WINDOWPOS_UNDEFINED, // x position
+                         SDL_WINDOWPOS_UNDEFINED, // y position
+                         Layout::ScreenUndocked::Width, Layout::ScreenUndocked::Height,
+                         SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
+    SDL_HideWindow(render_window);
+
+    if (render_window == nullptr) {
+        LOG_CRITICAL(Frontend, "Failed to create SDL2 window! {}", SDL_GetError());
+        exit(1);
+    }
+
+    gl_context = SDL_GL_CreateContext(render_window);
+
+    if (gl_context == nullptr) {
+        LOG_CRITICAL(Frontend, "Failed to create SDL2 GL context! {}", SDL_GetError());
+        exit(1);
+    }
+
+    if (!gladLoadGLLoader(static_cast<GLADloadproc>(SDL_GL_GetProcAddress))) {
+        LOG_CRITICAL(Frontend, "Failed to initialize GL functions! {}", SDL_GetError());
+        exit(1);
+    }
+
+    if (!SupportsRequiredGLExtensions()) {
+        LOG_CRITICAL(Frontend, "GPU does not support all required OpenGL extensions! Exiting...");
+        exit(1);
+    }
+
+    SDL_PumpEvents();
+    SDL_GL_SetSwapInterval(false);
+    LOG_INFO(Frontend, "yuzu-tester Version: {} | {}-{}", Common::g_build_fullname,
+             Common::g_scm_branch, Common::g_scm_desc);
+    Settings::LogSettings();
+
+    DoneCurrent();
+}
+
+EmuWindow_SDL2_Hide::~EmuWindow_SDL2_Hide() {
+    InputCommon::Shutdown();
+    SDL_GL_DeleteContext(gl_context);
+    SDL_Quit();
+}
+
+void EmuWindow_SDL2_Hide::SwapBuffers() {
+    SDL_GL_SwapWindow(render_window);
+}
+
+void EmuWindow_SDL2_Hide::PollEvents() {}
+
+void EmuWindow_SDL2_Hide::MakeCurrent() {
+    SDL_GL_MakeCurrent(render_window, gl_context);
+}
+
+void EmuWindow_SDL2_Hide::DoneCurrent() {
+    SDL_GL_MakeCurrent(render_window, nullptr);
+}

src/yuzu_tester/emu_window/emu_window_sdl2_hide.h

+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/frontend/emu_window.h"
+
+struct SDL_Window;
+
+class EmuWindow_SDL2_Hide : public Core::Frontend::EmuWindow {
+public:
+    explicit EmuWindow_SDL2_Hide();
+    ~EmuWindow_SDL2_Hide();
+
+    /// Swap buffers to display the next frame
+    void SwapBuffers() override;
+
+    /// Polls window events
+    void PollEvents() override;
+
+    /// Makes the graphics context current for the caller thread
+    void MakeCurrent() override;
+
+    /// Releases the GL context from the caller thread
+    void DoneCurrent() override;
+
+    /// Whether the window is still open, and a close request hasn't yet been sent
+    bool IsOpen() const;
+
+private:
+    /// Whether the GPU and driver supports the OpenGL extension required
+    bool SupportsRequiredGLExtensions();
+
+    /// Internal SDL2 render window
+    SDL_Window* render_window;
+
+    using SDL_GLContext = void*;
+    /// The OpenGL context associated with the window
+    SDL_GLContext gl_context;
+};