Add: Option to (dis-)allow accelerated video drivers. (#8819)

The video drivers using the OpenGL backend are currently our only
accelerated drivers. The options defaults to off for macOS builds and
to on everywhere else.

Co-authored-by: Michael Lutz <michi@icosahedron.de>

src/video/cocoa/cocoa_ogl.h

@@ -54,6 +54,9 @@ class FVideoDriver_CocoaOpenGL : public DriverFactoryBase {
 public:
 	FVideoDriver_CocoaOpenGL() : DriverFactoryBase(Driver::DT_VIDEO, 9, "cocoa-opengl", "Cocoa OpenGL Video Driver") {}
 	Driver *CreateInstance() const override { return new VideoDriver_CocoaOpenGL(); }
+
+protected:
+	bool UsesHardwareAcceleration() const override { return true; }
 };
 
 #endif /* VIDEO_COCOA_OGL_H */

src/video/cocoa/cocoa_v.h

@@ -122,7 +122,7 @@ protected:
 
 class FVideoDriver_CocoaQuartz : public DriverFactoryBase {
 public:
-	FVideoDriver_CocoaQuartz() : DriverFactoryBase(Driver::DT_VIDEO, 10, "cocoa", "Cocoa Video Driver") {}
+	FVideoDriver_CocoaQuartz() : DriverFactoryBase(Driver::DT_VIDEO, 8, "cocoa", "Cocoa Video Driver") {}
 	Driver *CreateInstance() const override { return new VideoDriver_CocoaQuartz(); }
 };
 

src/video/sdl2_opengl_v.h

@@ -51,4 +51,7 @@ class FVideoDriver_SDL_OpenGL : public DriverFactoryBase {
 public:
 	FVideoDriver_SDL_OpenGL() : DriverFactoryBase(Driver::DT_VIDEO, 8, "sdl-opengl", "SDL OpenGL Video Driver") {}
 	/* virtual */ Driver *CreateInstance() const override { return new VideoDriver_SDL_OpenGL(); }
+
+protected:
+	bool UsesHardwareAcceleration() const override { return true; }
 };

src/video/video_driver.cpp

@@ -17,6 +17,8 @@
 #include "../window_func.h"
 #include "video_driver.hpp"
 
+bool _video_hw_accel; ///< Whether to consider hardware accelerated video drivers.
+
 bool VideoDriver::Tick()
 {
 	auto cur_ticks = std::chrono::steady_clock::now();

src/video/video_driver.hpp

@@ -23,6 +23,7 @@ extern std::string _ini_videodriver;
 extern std::vector<Dimension> _resolutions;
 extern Dimension _cur_resolution;
 extern bool _rightclick_emulate;
+extern bool _video_hw_accel;
 
 /** The base of all video drivers. */
 class VideoDriver : public Driver {

src/video/win32_v.h

@@ -175,6 +175,9 @@ class FVideoDriver_Win32OpenGL : public DriverFactoryBase {
 public:
 	FVideoDriver_Win32OpenGL() : DriverFactoryBase(Driver::DT_VIDEO, 10, "win32-opengl", "Win32 OpenGL Video Driver") {}
 	/* virtual */ Driver *CreateInstance() const override { return new VideoDriver_Win32OpenGL(); }
+
+protected:
+	bool UsesHardwareAcceleration() const override { return true; }
 };
 
 #endif /* WITH_OPENGL */