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{
This file is part of the PTCPas framebuffer library
Copyright (C) 2012 Nikolay Nikolov (nickysn@users.sourceforge.net)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version
with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
}
{$IFDEF ENABLE_X11_EXTENSION_GLX}
constructor TX11GLXFBConfig.Create(ADisplay: PDisplay; AScreen: cint; const AAttr: IPTCOpenGLAttributes);
begin
FDisplay := ADisplay;
FScreen := AScreen;
{ default swap interval for the GLX_SGI_swap_control extension }
FSGISwapInterval := 1;
if not GLX_version_1_0(FDisplay) then
raise TPTCError.Create('GLX extension not supported');
ChooseFBConfig(AAttr);
GetVisualFromFBConfig;
end;
destructor TX11GLXFBConfig.Destroy;
begin
if FRenderingContextHasBeenMadeCurrentAtLeastOnce then
glXMakeContextCurrent(FDisplay, None, None, nil);
if FGLXContext <> nil then
glXDestroyContext(FDisplay, FGLXContext);
if FGLXWindowCreated then
glXDestroyWindow(FDisplay, FGLXWindow);
inherited;
end;
procedure TX11GLXFBConfig.ChooseFBConfig(const AAttr: IPTCOpenGLAttributes);
const
FBAttribList: array [0..18] of cint =
(GLX_X_RENDERABLE, 1,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER, 1,
GLX_STEREO, 0,
GLX_BUFFER_SIZE, 0,
GLX_DEPTH_SIZE, 0,
GLX_STENCIL_SIZE, 0,
None
);
var
FBConfigs: PGLXFBConfig = nil;
FBConfigsCount: cint = 0;
begin
if AAttr.DoubleBufferDontCare then
FBAttribList[9] := cint(GLX_DONT_CARE)
else
if AAttr.DoubleBuffer then
FBAttribList[9] := 1
else
FBAttribList[9] := 0;
if AAttr.StereoDontCare then
FBAttribList[11] := cint(GLX_DONT_CARE)
else
if AAttr.Stereo then
FBAttribList[11] := 1
else
FBAttribList[11] := 0;
FBAttribList[13] := AAttr.BufferSize;
FBAttribList[15] := AAttr.DepthSize;
FBAttribList[17] := AAttr.StencilSize;
FBConfigs := glXChooseFBConfig(FDisplay, FScreen, @FBAttribList[0], FBConfigsCount);
try
if (FBConfigs = nil) or (FBConfigsCount = 0) then
raise TPTCError.Create('Cannot find suitable OpenGL framebuffer configuration (GLXFBConfig)');
FGLXFBConfig := FBConfigs[0];
finally
if FBConfigs <> nil then
XFree(FBConfigs);
end;
end;
procedure TX11GLXFBConfig.GetVisualFromFBConfig;
var
vi: PXVisualInfo = nil;
begin
vi := glXGetVisualFromFBConfig(FDisplay, FGLXFBConfig);
try
if vi = nil then
raise TPTCError.Create('Cannot obtain XVisualInfo from GLXFBConfig');
FVisInfo := vi^;
finally
if vi <> nil then
XFree(vi);
end;
end;
procedure TX11GLXFBConfig.CreateRenderingContext;
begin
FGLXContext := glXCreateNewContext(FDisplay, FGLXFBConfig, GLX_RGBA_TYPE, nil, {False}True);
if FGLXContext = nil then
raise TPTCError.Create('Failed to create a GLX rendering context');
end;
procedure TX11GLXFBConfig.AttachToWindow(AWindow: TWindow);
begin
CreateRenderingContext;
FGLXWindow := glXCreateWindow(FDisplay, FGLXFBConfig, AWindow, nil);
{ if FGLXWindow = nil then
raise TPTCError.Create('Failed to create onscreen rendering area in window');}
FGLXWindowCreated := True;
end;
procedure TX11GLXFBConfig.MakeRenderingContextCurrent;
begin
if not glXMakeContextCurrent(FDisplay, FGLXWindow, FGLXWindow, FGLXContext) then
raise TPTCError.Create('Error making the rendering context current');
FRenderingContextHasBeenMadeCurrentAtLeastOnce := True;
{ although GLX functions aren't supposed to be context-specific, it doesn't hurt
to reload them after the context is ready }
InitGLX;
end;
procedure TX11GLXFBConfig.SetSwapInterval(AInterval: Integer);
function GlxResult2String(AGlxResult: cint): string;
begin
case AGlxResult of
GLX_BAD_VALUE: Result := 'GLX_BAD_VALUE';
GLX_BAD_CONTEXT: Result := 'GLX_BAD_CONTEXT';
else
Result := 'Unknown (' + IntToStr(AGlxResult) + ')';
end;
end;
var
GlxResult: cint;
begin
LOG('SetSwapInterval(' + IntToStr(AInterval) + ')');
if AInterval < 0 then
raise TPTCError.Create('Invalid swap interval');
LOG('checking if GLX_MESA_swap_control is supported');
if GLX_MESA_swap_control(FDisplay, FScreen) then
begin
LOG('using GLX_MESA_swap_control');
LOG('glXSwapIntervalMESA(' + IntToStr(AInterval) + ')');
GlxResult := glXSwapIntervalMESA(AInterval);
if GlxResult <> 0 then
LOG('glXSwapIntervalMESA failed: ' + GlxResult2String(GlxResult));
end
else
begin
LOG('checking if GLX_SGI_swap_control is supported');
if GLX_SGI_swap_control(FDisplay, FScreen) then
begin
LOG('using GLX_SGI_swap_control');
if AInterval = 0 then
begin
LOG('Warning: According to spec, the GLX_SGI_swap_control extension doesn''t');
LOG('support setting the swap interval to 0, so this call is likely to fail,');
LOG('but we''ll try it anyway, just in case the drivers support it.');
end;
LOG('glXSwapIntervalSGI(' + IntToStr(AInterval) + ')');
GlxResult := glXSwapIntervalSGI(AInterval);
if GlxResult <> 0 then
LOG('glXSwapIntervalSGI failed: ' + GlxResult2String(GlxResult));
if GlxResult = 0 then
FSGISwapInterval := AInterval;
end
else
LOG('no supported extensions found for setting the swap interval');
end;
end;
function TX11GLXFBConfig.GetSwapInterval: Integer;
begin
LOG('GetSwapInterval');
LOG('checking if GLX_MESA_swap_control is supported');
if GLX_MESA_swap_control(FDisplay, FScreen) then
begin
LOG('using GLX_MESA_swap_control');
LOG('glXGetSwapIntervalMESA()');
Result := glXGetSwapIntervalMESA();
LOG('glxGetSwapIntervalMESA() result', Result);
end
else
begin
LOG('checking if GLX_SGI_swap_control is supported');
if GLX_SGI_swap_control(FDisplay, FScreen) then
begin
LOG('GLX_SGI_swap_control is supported');
LOG('Returning the last set swap interval via this extension: ' + IntToStr(FSGISwapInterval));
Result := FSGISwapInterval;
end
else
begin
LOG('no supported extensions found for setting the swap interval, assuming the swap interval is 0');
Result := 0;
end;
end;
end;
procedure TX11GLXFBConfig.SwapBuffers;
begin
glXSwapBuffers(FDisplay, FGLXWindow);
end;
{$ENDIF ENABLE_X11_EXTENSION_GLX}
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