--- /dev/null
+unit uglcContext;
+
+{ Package: OpenGLCore
+ Prefix: glc - OpenGL Core
+ Beschreibung: diese Unit enthält eine abstrakte Klassen-Kapselung für OpenGL Kontexte
+
+
+Abstrakte Contextklasse zum Erstellen von Renderkontexten auf Windows & Linux(bzw X11/Gtk2)
+Für aktuelle Plattform passende Klasse kann per GetPlatformClass gefunden werden.
+
+Bsp.:
+ //muss im GUI/Main-Thread aufgerufen werden:
+ pf := TglcContext.GetPlatformClass().MakePF();
+ fContext := TglcContext.GetPlatformClass().Create(MyTWinControl, PF);
+
+ //_kann_ in Background Thread abgerufen werden:
+ fContext.BuildContext();
+ [Arbeit mit dem Context]
+ fContext.CloseContext();
+
+ //im MainThread
+ FreeAndNil(fContext)
+
+
+weitere Funktionen:
+ MakePF() erzeugt PixelFormatDescriptor mit Defaults
+ BuildContext() baut Kontext (kann in BackgrounThread aufgerufen werden)
+ CloseContext() gibt den Kontext frei (muss im selben Thread aufgerufen werden wie BuildContext;
+ wird der Kontext nur im MainThread genutzt, muss CloseContext nicht explizit aufgerufen
+ werden und wird beim zerstören des Kontext-Objekts ausgeführt)
+ Activate/Deactiveate Kontext aktiv schalten oder nicht
+ SwapBuffers DoubleBuffering
+ SetSwapInterval VSync
+ Share ShareLists
+ EnableDebugOutput GL-Debug via ARB_debug_output oder AMD_debug_output de/aktivieren
+}
+
+interface
+
+uses
+ SysUtils, Controls, dglOpenGL;
+
+const
+ GLC_CONTEXT_VERSION_UNKNOWN = -1;
+
+type
+ TMultiSample = 1..high(byte);
+ TglcContextPixelFormatSettings = packed record
+ DoubleBuffered: boolean;
+ Stereo: boolean;
+ MultiSampling: TMultiSample;
+ ColorBits: Integer;
+ DepthBits: Integer;
+ StencilBits: Integer;
+ AccumBits: Integer;
+ AuxBuffers: Integer;
+ Layer: Integer;
+ end;
+ TglcContextVersionSettings = packed record
+ Major: Integer;
+ Minor: Integer;
+ ForwardCompatible: Boolean;
+ end;
+
+ TglcDisplayFlag = (
+ dfFullscreen);
+ TglcDisplayFlags = set of TglcDisplayFlag;
+
+ EGLError = class(Exception);
+
+ { TglcContext }
+ TglcContextClass = class of TglcContext;
+ TglcContext = class
+ private
+ fControl: TWinControl;
+ fThreadID: TThreadID;
+ fEnableVsync: Boolean;
+
+ function GetEnableVSync: Boolean;
+ procedure SetEnableVSync(aValue: Boolean);
+
+ protected
+ fUseVersion: Boolean;
+ fPixelFormatSettings: TglcContextPixelFormatSettings;
+ fVersionSettings: TglcContextVersionSettings;
+ procedure OpenContext; virtual;
+
+ public
+ property PixelFormatSettings: TglcContextPixelFormatSettings read fPixelFormatSettings;
+ property VersionSettings: TglcContextVersionSettings read fVersionSettings;
+
+ constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings); virtual; overload;
+ constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings; const aVersionSettings: TglcContextVersionSettings); virtual; overload;
+ destructor Destroy; override;
+
+ property ThreadID: TThreadID read fThreadID;
+ property EnableVSync: Boolean read GetEnableVSync write SetEnableVSync;
+
+ procedure BuildContext;
+ procedure CloseContext; virtual;
+ procedure Activate; virtual; abstract;
+ procedure Deactivate; virtual; abstract;
+ function IsActive: boolean; virtual; abstract;
+ procedure SwapBuffers; virtual; abstract;
+ procedure SetSwapInterval(const aInterval: GLint); virtual; abstract;
+ function GetSwapInterval: GLint; virtual; abstract;
+ procedure Share(const aContext: TglcContext); virtual; abstract;
+
+ private class var
+ fMainContextThreadID: TThreadID;
+ public
+ class property MainContextThreadID: TThreadID read fMainContextThreadID;
+ class function MakePF(DoubleBuffered: boolean = true;
+ Stereo: boolean=false;
+ MultiSampling: TMultiSample=1;
+ ColorBits: Integer=32;
+ DepthBits: Integer=24;
+ StencilBits: Integer=0;
+ AccumBits: Integer=0;
+ AuxBuffers: Integer=0;
+ Layer: Integer=0): TglcContextPixelFormatSettings;
+ class function MakeVersion(const aMajor, aMinor: Integer; const aForwardCompatible: Boolean): TglcContextVersionSettings;
+ class function GetPlatformClass: TglcContextClass;
+ class function ChangeDisplaySettings(const aWidth, aHeight,
+ aBitPerPixel, aFreq: Integer; const aFlags: TglcDisplayFlags): Boolean; virtual; abstract;
+ class function IsAnyContextActive: boolean; virtual;
+ end;
+
+implementation
+
+uses
+ {$IFDEF WINDOWS}
+ uglcContextWGL
+ {$ENDIF}
+ {$IFDEF LINUX}
+ uglcContextGtk2GLX
+ {$ENDIF}
+ ;
+
+function TglcContext.GetEnableVSync: Boolean;
+begin
+ result := fEnableVsync;
+end;
+
+procedure TglcContext.SetEnableVSync(aValue: Boolean);
+begin
+ fEnableVsync := aValue;
+ if IsActive then begin
+ if fEnableVsync then
+ SetSwapInterval(1)
+ else
+ SetSwapInterval(0);
+ end;
+end;
+
+procedure TglcContext.OpenContext;
+begin
+ fThreadID := GetCurrentThreadId;
+ if fMainContextThreadID = 0 then
+ fMainContextThreadID := fThreadID;
+end;
+
+class function TglcContext.MakePF(DoubleBuffered: boolean; Stereo: boolean; MultiSampling: TMultiSample; ColorBits: Integer;
+ DepthBits: Integer; StencilBits: Integer; AccumBits: Integer; AuxBuffers: Integer; Layer: Integer): TglcContextPixelFormatSettings;
+begin
+ Result.DoubleBuffered:= DoubleBuffered;
+ Result.Stereo:= Stereo;
+ Result.MultiSampling:= MultiSampling;
+ Result.ColorBits:= ColorBits;
+ Result.DepthBits:= DepthBits;
+ Result.StencilBits:= StencilBits;
+ Result.AccumBits:= AccumBits;
+ Result.AuxBuffers:= AuxBuffers;
+ Result.Layer:= Layer;
+end;
+
+class function TglcContext.MakeVersion(const aMajor, aMinor: Integer; const aForwardCompatible: Boolean): TglcContextVersionSettings;
+begin
+ result.Major := aMajor;
+ result.Minor := aMinor;
+ result.ForwardCompatible := aForwardCompatible;
+end;
+
+class function TglcContext.GetPlatformClass: TglcContextClass;
+begin
+ {$IFDEF WINDOWS}
+ Result:= TglcContextWGL;
+ {$ENDIF}
+ {$IFDEF LINUX}
+ Result:= TglcContextGtk2GLX;
+ {$ENDIF}
+end;
+
+class function TglcContext.IsAnyContextActive: boolean;
+begin
+ Result:= GetPlatformClass.IsAnyContextActive;
+end;
+
+constructor TglcContext.Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings);
+begin
+ inherited Create;
+ fPixelFormatSettings := aPixelFormatSettings;
+ FControl := aControl;
+ fThreadID := 0;
+ fEnableVsync := false;
+ fUseVersion := false;
+ InitOpenGL();
+end;
+
+constructor TglcContext.Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings; const aVersionSettings: TglcContextVersionSettings);
+begin
+ Create(aControl, aPixelFormatSettings);
+ fVersionSettings := aVersionSettings;
+ fUseVersion := true;
+end;
+
+destructor TglcContext.Destroy;
+begin
+ if (GetCurrentThreadId = fMainContextThreadID) then
+ fMainContextThreadID := 0;
+ CloseContext;
+ inherited Destroy;
+end;
+
+procedure TglcContext.BuildContext;
+begin
+ OpenContext;
+ Activate;
+ ReadImplementationProperties;
+ ReadExtensions;
+ SetEnableVSync(fEnableVsync);
+end;
+
+procedure TglcContext.CloseContext;
+begin
+ if fMainContextThreadID = fThreadID then
+ fMainContextThreadID := 0;
+end;
+
+initialization
+ TglcContext.fMainContextThreadID := 0;
+
+end.
+
projects / LazOpenGLCore.git / blobdiff