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{
*****************************************************************************
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
Author: Mattias Gaertner
}
unit GLQTContext;
{$mode objfpc}{$H+}
{$LinkLib GL}
{$PACKRECORDS C}
interface
uses
Classes, SysUtils, Controls, LCLProc, LCLType, X, XUtil, XLib, gl,
InterfaceBase,
WSLCLClasses,
// Bindings
qt4,
qtwidgets, qtobjects, qtproc, qtint,
QtWSControls;
// gdkgl
const
// enum _QT_GL_CONFIGS
QT_GL_NONE = 0;
QT_GL_USE_GL = 1;
QT_GL_BUFFER_SIZE = 2;
QT_GL_LEVEL = 3;
QT_GL_RGBA = 4;
QT_GL_DOUBLEBUFFER = 5;
QT_GL_STEREO = 6;
QT_GL_AUX_BUFFERS = 7;
QT_GL_RED_SIZE = 8;
QT_GL_GREEN_SIZE = 9;
QT_GL_BLUE_SIZE = 10;
QT_GL_ALPHA_SIZE = 11;
QT_GL_DEPTH_SIZE = 12;
QT_GL_STENCIL_SIZE = 13;
QT_GL_ACCUM_RED_SIZE = 14;
QT_GL_ACCUM_GREEN_SIZE = 15;
QT_GL_ACCUM_BLUE_SIZE = 16;
QT_GL_ACCUM_ALPHA_SIZE = 17;
// GLX_EXT_visual_info extension
QT_GL_X_VISUAL_TYPE_EXT = $22;
QT_GL_TRANSPARENT_TYPE_EXT = $23;
QT_GL_TRANSPARENT_INDEX_VALUE_EXT = $24;
QT_GL_TRANSPARENT_RED_VALUE_EXT = $25;
QT_GL_TRANSPARENT_GREEN_VALUE_EXT = $26;
QT_GL_TRANSPARENT_BLUE_VALUE_EXT = $27;
QT_GL_TRANSPARENT_ALPHA_VALUE_EXT = $28;
type
TGLXContext = pointer;
procedure LOpenGLViewport(Left, Top, Width, Height: integer);
procedure LOpenGLSwapBuffers(Handle: HWND);
function LOpenGLMakeCurrent(Handle: HWND): boolean;
function LOpenGLReleaseContext(Handle: HWND): boolean;
function LOpenGLCreateContext(AWinControl: TWinControl;
WSPrivate: TWSPrivateClass; SharedControl: TWinControl;
DoubleBuffered, RGBA: boolean;
const MultiSampling, AlphaBits, DepthBits, StencilBits: Cardinal;
const AParams: TCreateParams): HWND;
procedure LOpenGLDestroyContextInfo(AWinControl: TWinControl);
function CreateOpenGLContextAttrList(DoubleBuffered: boolean;
RGBA: boolean): PInteger;
implementation
type
//PGLXPixmap = ^GLXPixmap;
GLXPixmap = TXID;
//PGLXDrawable = ^GLXDrawable;
GLXDrawable = TXID;
{ GLX 1.0 functions. }
function glXChooseVisual(dpy:PDisplay; screen:longint; attrib_list:Plongint):PXVisualInfo;cdecl;external;
procedure glXCopyContext(dpy:PDisplay; src:TGLXContext; dst:TGLXContext; mask: cardinal);cdecl;external;
function glXCreateContext(dpy:PDisplay; vis:PXVisualInfo; share_list:TGLXContext; direct:TBool):TGLXContext;cdecl;external;
function glXCreateGLXPixmap(dpy:PDisplay; vis:PXVisualInfo; pixmap:TPixmap):GLXPixmap;cdecl;external;
procedure glXDestroyContext(dpy:PDisplay; ctx:TGLXContext);cdecl;external;
procedure glXDestroyGLXPixmap(dpy:PDisplay; pix:GLXPixmap);cdecl;external;
function glXGetConfig(dpy:PDisplay; vis:PXVisualInfo; attrib:longint; value:Plongint):longint;cdecl;external;
function glXGetCurrentContext:TGLXContext;cdecl;external;
function glXGetCurrentDrawable:GLXDrawable;cdecl;external;
function glXIsDirect(dpy:PDisplay; ctx:TGLXContext):TBool;cdecl;external;
function glXMakeCurrent(dpy:PDisplay; drawable:GLXDrawable; ctx:TGLXContext):TBool;cdecl;external;
function glXQueryExtension(dpy:PDisplay; error_base:Plongint; event_base:Plongint):TBool;cdecl;external;
function glXQueryVersion(dpy:PDisplay; major:Plongint; minor:Plongint):TBool;cdecl;external;
procedure glXSwapBuffers(dpy:PDisplay; drawable:GLXDrawable);cdecl;external;
procedure glXUseXFont(font:TFont; first:longint; count:longint; list_base:longint);cdecl;external;
procedure glXWaitGL;cdecl;external;
procedure glXWaitX;cdecl;external;
function XVisualAsString(AVisual: PVisual): string;
begin
if AVisual=nil then begin
Result:='nil';
end else begin
Result:=''
+' bits_per_rgb='+dbgs(AVisual^.bits_per_rgb)
+' red_mask='+hexstr(AVisual^.red_mask,8)
+' green_mask='+hexstr(AVisual^.green_mask,8)
+' blue_mask='+hexstr(AVisual^.blue_mask,8)
+' map_entries='+dbgs(AVisual^.map_entries)
+'';
end;
end;
function XDisplayAsString(ADisplay: PDisplay): string;
begin
if ADisplay=nil then begin
Result:='nil';
end else begin
Result:=''
+'';
end;
end;
type
{ TQtGLWidget }
TQtGLWidget = class(TQtWidget)
public
xdisplay: PDisplay;
visual: PXVisualInfo;
glxcontext: TGLXContext;
ref_count: integer;
function GetGLXDrawable: GLXDrawable;
end;
{ TQtGLWidget }
function TQtGLWidget.GetGLXDrawable: GLXDrawable;
begin
Result:=0; {$ERROR ToDo: get GLXDrawable}
end;
procedure LOpenGLViewport(Left, Top, Width, Height: integer);
begin
glViewport(Left,Top,Width,Height);
end;
procedure LOpenGLSwapBuffers(Handle: HWND);
var
Widget: TQtGLWidget;
begin
if Handle=0 then
RaiseGDBException('LOpenGLSwapBuffers Handle=0');
Widget:=TQtGLWidget(Handle);
glXSwapBuffers(Widget.xdisplay,
Widget.GetGLXDrawable
);
end;
function LOpenGLMakeCurrent(Handle: HWND): boolean;
var
Widget: TQtGLWidget;
begin
if Handle=0 then
RaiseGDBException('LOpenGLSwapBuffers Handle=0');
Result:=false;
Widget:=TQtGLWidget(Handle);
Result:=boolean(glXMakeCurrent(Widget.xdisplay,
Widget.GetGLXDrawable,
Widget.glxcontext));
end;
function LOpenGLReleaseContext(Handle: HWND): boolean;
var
Widget: TQtGLWidget;
begin
Result := false;
if Handle=0 then
RaiseGDBException('LOpenGLSwapBuffers Handle=0');
Widget:=TQtGLWidget(Handle);
Result := glXMakeCurrent(Widget.xdisplay, 0, nil);
end;
end;
function LOpenGLCreateContext(AWinControl: TWinControl;
WSPrivate: TWSPrivateClass; SharedControl: TWinControl;
DoubleBuffered, RGBA: boolean;
const MultiSampling, AlphaBits, DepthBits, StencilBits: Cardinal;
const AParams: TCreateParams): HWND;
var
AttrList: PInteger;
NewQtWidget: TQtGLWidget;
direct: TBool;
begin
if WSPrivate=nil then ;
AttrList:=CreateOpenGLContextAttrList(DoubleBuffered,RGBA);
try
NewQtWidget:=TQtGLWidget.Create(AWinControl,AParams);
NewQtWidget.xdisplay := QX11Info_display;
NewQtWidget.visual:=glXChooseVisual(NewQtWidget.xdisplay,
DefaultScreen(NewQtWidget.xdisplay), @attrList[0]);
direct:=0;
NewQtWidget.glxcontext := glXCreateContext(NewQtWidget.xdisplay,
NewQtWidget.visual, nil, direct);
NewQtWidget.ref_count := 1;
NewQtWidget.AttachEvents;
Result:=HWND(PtrUInt(Pointer(NewQtWidget)));
finally
FreeMem(AttrList);
end;
end;
procedure LOpenGLDestroyContextInfo(AWinControl: TWinControl);
begin
if not AWinControl.HandleAllocated then exit;
// nothing to do
end;
function CreateOpenGLContextAttrList(DoubleBuffered: boolean; RGBA: boolean
): PInteger;
var
p: integer;
procedure Add(i: integer);
begin
if Result<>nil then
Result[p]:=i;
inc(p);
end;
procedure CreateList;
begin
if DoubleBuffered then
Add(QT_GL_DOUBLEBUFFER);
if RGBA then
Add(QT_GL_RGBA);
Add(QT_GL_RED_SIZE); Add(1);
Add(QT_GL_GREEN_SIZE); Add(1);
Add(QT_GL_BLUE_SIZE); Add(1);
Add(QT_GL_DEPTH_SIZE); Add(1);
Add(QT_GL_STENCIL_SIZE); Add(1);
Add(QT_GL_None);
end;
begin
Result:=nil;
p:=0;
CreateList;
GetMem(Result,SizeOf(integer)*p);
p:=0;
CreateList;
end;
end.
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