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unit GLGtk3GlxContext;
{$mode objfpc}
{$LinkLib GL}
interface
uses
Classes, SysUtils, ctypes, X, XUtil, XLib, gl, glext, glx,
// LazUtils
LazUtilities,
// LCL
LCLType, InterfaceBase, LMessages, Controls,
WSLCLClasses, LCLMessageGlue,
glib2, gtk3int, LazGdk3, LazGtk3, gtk3widgets;
function LBackingScaleFactor(Handle: HWND): single;
procedure LOpenGLViewport({%H-}Handle: HWND; Left, Top, Width, Height: integer);
procedure LOpenGLSwapBuffers(Handle: HWND);
function LOpenGLMakeCurrent(Handle: HWND): boolean;
function LOpenGLReleaseContext({%H-}Handle: HWND): boolean;
function LOpenGLCreateContext(AWinControl: TWinControl;
WSPrivate: TWSPrivateClass; SharedControl: TWinControl;
DoubleBuffered, RGBA, DebugContext: boolean;
const RedBits, GreenBits, BlueBits, MajorVersion, MinorVersion,
MultiSampling, AlphaBits, DepthBits, StencilBits, AUXBuffers: Cardinal;
const AParams: TCreateParams): HWND;
procedure LOpenGLDestroyContextInfo(AWinControl: TWinControl);
implementation
{$assertions on}
procedure on_render(widget: PGtkWidget; context: gpointer{Pcairo_t}; data: TGtk3Widget); cdecl;
begin
data.LCLObject.Perform(LM_PAINT, WParam(data), 0);
end;
function gtkglarea_size_allocateCB(Widget: PGtkWidget; Size: pGtkAllocation; Data: gPointer): GBoolean; cdecl;
var
SizeMsg: TLMSize;
GtkWidth, GtkHeight: integer;
LCLControl: TWinControl;
begin
Result := true;
LCLControl:=TWinControl(Data);
if LCLControl=nil then exit;
gtk_widget_get_size_request(Widget, @GtkWidth, @GtkHeight);
SizeMsg.Msg:=0;
FillChar(SizeMsg,SizeOf(SizeMsg),0);
with SizeMsg do
begin
Result := 0;
Msg := LM_SIZE;
SizeType := Size_SourceIsInterface;
Width := SmallInt(GtkWidth);
Height := SmallInt(GtkHeight);
end;
LCLControl.WindowProc(TLMessage(SizeMsg));
end;
function gtk_gl_area_get_error (area: PGtkGLArea): PGError; cdecl; external;
function LBackingScaleFactor(Handle: HWND): single;
var
glarea: TGtk3GLArea absolute Handle;
begin
// todo(ryan): get the correct screen for the handle!
result := TGdkScreen.get_default^.get_monitor_scale_factor(0);
end;
procedure LOpenGLViewport(Handle: HWND; Left, Top, Width, Height: integer);
var
scaleFactor: integer;
begin
scaleFactor := RoundToInt(LBackingScaleFactor(Handle));
glViewport(Left,Top,Width*scaleFactor,Height*scaleFactor);
end;
procedure LOpenGLSwapBuffers(Handle: HWND);
var
glarea: TGtk3GLArea absolute Handle;
begin
if Handle=0 then exit;
glFlush();
end;
function LOpenGLMakeCurrent(Handle: HWND): boolean;
var
glarea: TGtk3GLArea absolute Handle;
begin
glarea.Widget^.realize;
PGtkGLArea(glarea.Widget)^.make_current;
Assert(gtk_gl_area_get_error(PGtkGLArea(glarea.Widget)) = nil, 'LOpenGLMakeCurrent failed');
result := true;
end;
function LOpenGLReleaseContext(Handle: HWND): boolean;
var
glarea: TGtk3GLArea absolute Handle;
begin
// todo(ryan): is it possible to make no context current?
result:=true;
end;
function LOpenGLCreateContext(AWinControl: TWinControl;
WSPrivate: TWSPrivateClass; SharedControl: TWinControl;
DoubleBuffered, RGBA, DebugContext: boolean;
const RedBits, GreenBits, BlueBits, MajorVersion, MinorVersion,
MultiSampling, AlphaBits, DepthBits, StencilBits, AUXBuffers: Cardinal;
const AParams: TCreateParams): HWND;
var
NewWidget: TGtk3GLArea;
glarea: PGtkGLArea;
begin
NewWidget := TGtk3GLArea.Create(AWinControl, AParams);
result := TLCLIntfHandle(NewWidget);
glarea := PGtkGLArea(NewWidget.Widget);
g_signal_connect(glarea, 'render', TGCallback(@on_render), NewWidget);
// todo(ryan): do we need this?
g_signal_connect_after(glarea, 'size-allocate', TGCallback(@gtkglarea_size_allocateCB), AWinControl);
glarea^.set_auto_render(false);
glarea^.set_required_version(MajorVersion, MinorVersion);
glarea^.set_has_depth_buffer(DepthBits > 0);
glarea^.set_has_alpha(AlphaBits > 0);
glarea^.set_has_stencil_buffer(StencilBits > 0);
end;
procedure LOpenGLDestroyContextInfo(AWinControl: TWinControl);
begin
if not AWinControl.HandleAllocated then exit;
// nothing to do
end;
end.
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