/usr/src/castle-game-engine-5.2.0/opengl/castleglimages_mipmaps.inc is in castle-game-engine-src 5.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright 2001-2014 Michalis Kamburelis.
This file is part of "Castle Game Engine".
"Castle Game Engine" is free software; see the file COPYING.txt,
included in this distribution, for details about the copyright.
"Castle Game Engine" 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.
----------------------------------------------------------------------------
}
{ Part of CastleGLImages unit: mipmaps utils. }
{$ifdef read_interface}
type
EGenerateMipmapNotAvailable = class(Exception);
{ Is GenerateMipmap avaiable. This checks some GL extensions/versions that
give us glGenerateMipmap or glGenerateMipmapEXT call, used by GenerateMipmap. }
function HasGenerateMipmap: boolean;
{ Call glGenerateMipmap (or analogous function from some OpenGL extension).
@raises(EGenerateMipmapNotAvailable If no glGenerateMipmap version
is available on this OpenGL version. If you don't want to get
this exception, you can always check HasGenerateMipmap
before calling this.) }
procedure GenerateMipmap(target: TGLenum);
{$endif read_interface}
{$ifdef read_implementation}
{ GenerateMipmap ------------------------------------------------------------- }
{ $define TEST_NO_GENERATE_MIPMAP}
function HasGenerateMipmap: boolean;
{$ifdef TEST_NO_GENERATE_MIPMAP}
begin
Result := false;
{$else}
begin
Result := (GLFeatures.Framebuffer <> gsNone) and (not GLVersion.BuggyGenerateMipmap);
{$endif}
end;
procedure GenerateMipmap(target: TGLenum);
begin
{$ifndef TEST_NO_GENERATE_MIPMAP}
if GLFeatures.Framebuffer <> gsNone then
begin
{$ifndef OpenGLES}
glPushAttrib(GL_ENABLE_BIT);
{ To work under fglrx (confirmed on chantal (ATI Mobility Radeon X1600)),
we have to temporarily enable target.
At least with EXT_framebuffer_object.
This is a known ATI drivers problem:
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=237052 }
glEnable(Target);
case GLFeatures.Framebuffer of
gsExtension: glGenerateMipmapEXT(Target);
gsStandard : glGenerateMipmap (Target);
end;
glPopAttrib;
{$else}
glGenerateMipmap(Target);
{$endif}
end else
{$endif}
raise EGenerateMipmapNotAvailable.Create('Framebuffer not supported, glGenerateMipmap[EXT] not available');
end;
{$endif read_implementation}
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