cocoa_ogl.mm

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#if defined(WITH_COCOA) || defined(DOXYGEN_API)
 
#include "../../stdafx.h"
#include "../../os/macosx/macos.h"

#define GL_SILENCE_DEPRECATION
 
#include "../../os/macosx/macos_objective_c.h"
#include "../../openttd.h"
#include "../../debug.h"
#include "../../core/geometry_func.hpp"
#include "../../core/math_func.hpp"
#include "cocoa_ogl.h"
#include "cocoa_wnd.h"
#include "../../blitter/factory.hpp"
#include "../../gfx_func.h"
#include "../../framerate_type.h"
#include "../opengl.h"
 
#import <dlfcn.h>
#import <OpenGL/OpenGL.h>
#import <OpenGL/gl3.h>
 
static Palette _local_palette; 

static OGLProc GetOGLProcAddressCallback(const char *proc)
{
  static void *dl = nullptr;
 
  if (dl == nullptr) {
    dl = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY);
  }
 
  return reinterpret_cast<OGLProc>(dlsym(dl, proc));
}
 
@interface OTTD_CGLLayer : CAOpenGLLayer {
@private
  CGLContextObj _context;
}
 
@property (class) bool allowSoftware;
+ (CGLPixelFormatObj)defaultPixelFormat;
 
- (instancetype)initWithContext:(CGLContextObj)context;
@end
 
@implementation OTTD_CGLLayer
 
static bool _allowSoftware;
+ (bool)allowSoftware
{
  return _allowSoftware;
}
+ (void)setAllowSoftware:(bool)newVal
{
  _allowSoftware = newVal;
}
 
- (instancetype)initWithContext:(CGLContextObj)context
{
  if (self = [ super init ]) {
    self->_context = context;
 
    self.opaque = YES;
    self.magnificationFilter = kCAFilterNearest;
  }
  return self;
}
 
+ (CGLPixelFormatObj)defaultPixelFormat
{
  CGLPixelFormatAttribute attribs[] = {
    kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute)kCGLOGLPVersion_3_2_Core,
    kCGLPFAColorSize, (CGLPixelFormatAttribute)24,
    kCGLPFAAlphaSize, (CGLPixelFormatAttribute)0,
    kCGLPFADepthSize, (CGLPixelFormatAttribute)0,
    kCGLPFADoubleBuffer,
    kCGLPFAAllowOfflineRenderers,
    kCGLPFASupportsAutomaticGraphicsSwitching,
    kCGLPFANoRecovery,
    _allowSoftware ? (CGLPixelFormatAttribute)0 : kCGLPFAAccelerated,
    (CGLPixelFormatAttribute)0
  };
 
  CGLPixelFormatObj pxfmt = nullptr;
  GLint numPixelFormats;
  CGLChoosePixelFormat(attribs, &pxfmt, &numPixelFormats);
 
  return pxfmt;
}
 
- (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask
{
  return [ OTTD_CGLLayer defaultPixelFormat ];
}
 
- (CGLContextObj)copyCGLContextForPixelFormat:(CGLPixelFormatObj)pf
{
  CGLContextObj ctx;
  CGLCreateContext(pf, self->_context, &ctx);
 
  /* Set context state that is not shared. */
  CGLSetCurrentContext(ctx);
  OpenGLBackend::Get()->PrepareContext();
 
  return ctx;
}
 
- (void)drawInCGLContext:(CGLContextObj)ctx pixelFormat:(CGLPixelFormatObj)pf forLayerTime:(CFTimeInterval)t displayTime:(nullable const CVTimeStamp *)ts
{
  CGLSetCurrentContext(ctx);
 
  OpenGLBackend::Get()->Paint();
  OpenGLBackend::Get()->DrawMouseCursor();
 
  [ super drawInCGLContext:ctx pixelFormat:pf forLayerTime:t displayTime:ts ];
}
@end
 
@interface OTTD_CGLLayerView : NSView
- (instancetype)initWithFrame:(NSRect)frameRect context:(CGLContextObj)context;
@end
 
@implementation OTTD_CGLLayerView
 
- (instancetype)initWithFrame:(NSRect)frameRect context:(CGLContextObj)context
{
  if (self = [ super initWithFrame:frameRect ]) {
    /* We manage our content updates ourselves. */
    self.layerContentsRedrawPolicy = NSViewLayerContentsRedrawOnSetNeedsDisplay;
 
    /* Create backing layer. */
    CALayer *l = [ [ OTTD_CGLLayer alloc ] initWithContext:context ];
    self.layer = l;
    self.wantsLayer = YES;
    [ l release ];
  }
  return self;
}
 
- (BOOL)acceptsFirstResponder
{
  return NO;
}
 
- (BOOL)isOpaque
{
  return YES;
}
 
- (void)viewDidChangeBackingProperties
{
  self.layer.contentsScale = _allow_hidpi_window && [ self.window respondsToSelector:@selector(backingScaleFactor) ] ? [ self.window backingScaleFactor ] : 1.0f;
}
@end
 

static FVideoDriver_CocoaOpenGL iFVideoDriver_CocoaOpenGL;
 
 
std::optional<std::string_view> VideoDriver_CocoaOpenGL::Start(const StringList &param)
{
  auto err = this->Initialize();
  if (err) return err;
 
  int bpp = BlitterFactory::GetCurrentBlitter()->GetScreenDepth();
  if (bpp != 8 && bpp != 32) {
    this->Stop();
    return "The cocoa OpenGL subdriver only supports 8 and 32 bpp.";
  }
 
  /* Try to allocate GL context. */
  err = this->AllocateContext(GetDriverParamBool(param, "software"));
  if (err) {
    this->Stop();
    return err;
  }
 
  this->driver_info = GetName();
  this->driver_info += " (";
  this->driver_info += OpenGLBackend::Get()->GetDriverName();
  this->driver_info += ")";
 
  bool fullscreen = _fullscreen;
  if (!this->MakeWindow(_cur_resolution.width, _cur_resolution.height)) {
    this->Stop();
    return "Could not create window";
  }
 
  this->AllocateBackingStore(true);
 
  if (fullscreen) this->ToggleFullscreen(fullscreen);
 
  this->GameSizeChanged();
  this->UpdateVideoModes();
  MarkWholeScreenDirty();
 
  this->is_game_threaded = !GetDriverParamBool(param, "no_threads") && !GetDriverParamBool(param, "no_thread");
 
  return std::nullopt;
 
}
 
void VideoDriver_CocoaOpenGL::Stop()
{
  this->VideoDriver_Cocoa::Stop();
 
  CGLSetCurrentContext(this->gl_context);
  OpenGLBackend::Destroy();
  CGLReleaseContext(this->gl_context);
}
 
void VideoDriver_CocoaOpenGL::PopulateSystemSprites()
{
  VideoDriver_Cocoa::PopulateSystemSprites();
 
  OpenGLBackend::Get()->PopulateCursorCache();
}
 
void VideoDriver_CocoaOpenGL::ClearSystemSprites()
{
  VideoDriver_Cocoa::ClearSystemSprites();
 
  CGLSetCurrentContext(this->gl_context);
  OpenGLBackend::Get()->ClearCursorCache();
}
 
std::optional<std::string_view> VideoDriver_CocoaOpenGL::AllocateContext(bool allow_software)
{
  [ OTTD_CGLLayer setAllowSoftware:allow_software ];
 
  CGLPixelFormatObj pxfmt = [ OTTD_CGLLayer defaultPixelFormat ];
  if (pxfmt == nullptr) return "No suitable pixel format found";
 
  CGLCreateContext(pxfmt, nullptr, &this->gl_context);
  CGLDestroyPixelFormat(pxfmt);
 
  if (this->gl_context == nullptr) return "Can't create a rendering context";
 
  CGLSetCurrentContext(this->gl_context);
 
  return OpenGLBackend::Create(&GetOGLProcAddressCallback, this->GetScreenSize());
}
 
NSView *VideoDriver_CocoaOpenGL::AllocateDrawView()
{
  return [ [ OTTD_CGLLayerView alloc ] initWithFrame:this->cocoaview.bounds context:this->gl_context ];
}

void VideoDriver_CocoaOpenGL::AllocateBackingStore(bool force)
{
  if (this->window == nil || this->setup) return;
 
  if (_screen.dst_ptr != nullptr) this->ReleaseVideoPointer();
 
  CGLSetCurrentContext(this->gl_context);
  NSRect frame = [ this->cocoaview getRealRect:[ this->cocoaview frame ] ];
  OpenGLBackend::Get()->Resize(frame.size.width, frame.size.height, force);
  if (this->buffer_locked) _screen.dst_ptr = this->GetVideoPointer();
  this->dirty_rect = {};
 
  /* Redraw screen */
  this->GameSizeChanged();
}
 
void *VideoDriver_CocoaOpenGL::GetVideoPointer()
{
  CGLSetCurrentContext(this->gl_context);
  if (BlitterFactory::GetCurrentBlitter()->NeedsAnimationBuffer()) {
    this->anim_buffer = OpenGLBackend::Get()->GetAnimBuffer();
  }
  return OpenGLBackend::Get()->GetVideoBuffer();
}
 
void VideoDriver_CocoaOpenGL::ReleaseVideoPointer()
{
  CGLSetCurrentContext(this->gl_context);
 
  if (this->anim_buffer != nullptr) OpenGLBackend::Get()->ReleaseAnimBuffer(this->dirty_rect);
  OpenGLBackend::Get()->ReleaseVideoBuffer(this->dirty_rect);
  this->dirty_rect = {};
  _screen.dst_ptr = nullptr;
  this->anim_buffer = nullptr;
}
 
void VideoDriver_CocoaOpenGL::Paint()
{
  PerformanceMeasurer framerate(PFE_VIDEO);
 
  if (CopyPalette(_local_palette)) {
    Blitter *blitter = BlitterFactory::GetCurrentBlitter();
 
    /* Always push a changed palette to OpenGL. */
    CGLSetCurrentContext(this->gl_context);
    OpenGLBackend::Get()->UpdatePalette(_local_palette.palette, _local_palette.first_dirty, _local_palette.count_dirty);
    if (blitter->UsePaletteAnimation() == Blitter::PaletteAnimation::Blitter) {
      blitter->PaletteAnimate(_local_palette);
    }
  }
 
  [ CATransaction begin ];
  [ this->cocoaview.subviews[0].layer setNeedsDisplay ];
  [ CATransaction commit ];
}
 
#endif /* WITH_COCOA or DOXYGEN_API */