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 Copyright (c) 1998,1999 Kenneth Albanowski. All rights reserved.
 Copyright (c) 2000 Ilya Zakharevich. All rights reserved.
 Copyright (c) 2007 Bob Free. All rights reserved.
 Copyright (c) 2009-2013 Chris Marshall. All rights reserved.
 Copyright (c) 2015 Bob Free. All rights reserved.
 Copyright (c) 2016 Chris Marshall. All rights reserved.
 This program is free software; you can redistribute it and/or
 modify it under the same terms as Perl itself. 


Perl OpenGL: a.k.a. POGL

As of OpenGL-0.57 POGL now requires FreeGLUT (GLUT on Mac OS X)
for full functionality:

  http://freeglut.sourceforge.net/

This was due to licensing constraints and lack of window close events
in GLUT.  Efforts are being made to support the original GLUT with
reduced functionality and limited to the common subset of operations.


NOTE: FreeGLUT distributions on Linux are deployed as libglut.so files,
making it difficult to detect whether GLUT or FreeGLUT is installed.
As such, FreeGLUT is assumed.  See INSTALL for options to override
this default.


NOTE: POGL automatically installs a binary FreeGLUT library on 32bit
      win32 perl platforms.


POGL provides access to most of the OpenGL 1.0, 1.1, and 1.2 APIs, and
many OpenGL Extensions, such as Framebuffer Objects (FBOs) and Vertex
Array Objects (VBOs).

Some amount of GLU is supported, and GLUT is completely supported up
to API version 3, with some support for 4.0 and FreeGlut 2.4.0.  A small
portion of GLX and X11 may still be supported, but this is deprecated
in favor of FreeGLUT and will be removed in the future.  If you use
this functionality, please let us know.


Compatibility notes with OpenGL 0.4:

    The OpenGL 0.4 library, written by Stan Melax, contains more
    support for some SGI specific functions then 0.5, so you may
    wish to stay with 0.4 on an SGI system. For other machines,
    0.5 should greatly improve compatibility (compiling where 0.4
    wouldn't have).
    
    Code-level compatibility with OpenGL 0.4 is available if you
    refer to OpenGL simply via 'use OpenGL;'. If you request specific
    packages (such as 'use OpenGL qw(glfunctions glconstants
    glutfunctions);'), you'll get 0.5 specific support.  For more
    information, please read the OpenGL manual, available in OpenGL.pod.
    
    Portions of this module that directly derive from Stan's code
    are marked with "Melax" comments, and his copyright is described
    in the COPYRIGHT file.

As this library is a simple binding between Perl and any library
that complies with the OpenGL API, this module should interoperate
seamlessly with any other modules that make use of OpenGL directly
or (through another library) indirectly.

For build instructions, please see the INSTALL file.

For a brief description of what functions are supported, please read
"SUPPORTS", and better yet read the two sample files, test.pl and
isosurf.pl.

Thanks for help developing this module goes to Stan Melax, Cass Everitt,
Alligator Descarte, and probably others that I've forgotten.

Happy Hacking,
Kenneth Albanowski <kjahds@kjahds.com>

As of April 13, 2007, Bob Free has assumed primary ownership of
this module.

As of July 03, 2011, Chris Marshall started the Perl OpenGL Project
at http://sourceforge.net/projects/pogl/ .  All development and
module support going forward has moved there.

Chris Marshall is the current maintainer of this module.



DISTRIBUTIONS:

CPAN: http://search.cpan.org/~chm/	# for latest CPAN version

GIT: git clone git://pogl.git.sourceforge.net/gitroot/pogl/pogl

PPM for 32-bit perl 5.8 +: http://www.sisyphusion.tk/ppm/OpenGL.ppd

PPM for 64-bit perl 5.10+: http://www.sisyphusion.tk/ppm/OpenGL.ppd



Changes:

0.58+:  Chris Marshall <devel DOT chm DOT 01 at gmail DOT com>
        See GIT_CHANGES file in CPAN releases or use git log --stat on
        a git repository

0.57:	Bob "grafman" Free <grafman@graphcomp.com>
	Updated test.pl to fix fullscreen handling
	Fixed OpenGL.pod to reflect correct module name
	Added FBO constants to param enums in gl_util.c
	Implemented GL_ARB_point_parameters
	Implemented GL_ARB_multisample
	Implemented GL_ARB_color_buffer_float
	Added OGA calc and affine functions
	Added glpHasGPGPU
	Added an ATI workaround for GL_ARB_shading_language_100 dependencies
	Added VBO and FBO caching in OGAs - gl_util.h
	Fixed gluProject and gluUnProject - was converting matrices to ints
	Added glutSpecialUpFunc and glutWindowStatusFunc
	Added dist option to Makefile.PL to support binary distributions
	Switched from GLUT to FreeGLUT
	Added FreeGLUT folder for Win32 DLLs
	Implemented glutSetOption
	Implemented glutGameModeString
	Implemented glutEnterGameMode
	Implemented glutLeaveGameMode
	Implemented glutGameModeGet
	Added glpFullScreen and glpRestoreScreen
	Updated test.pl to support Game Mode
	Implemented glutCloseFunc
	Implemented glutLeaveMainLoop
	Major refactoring of Makefile.PL
	Renamed WGL interface option to W32API
	Added help message to Makefile.PL
	Added verbose option to Makefile.PL
	Added documentation comments to OpenGL.xs
	Added glpHasGLUT
	Updated test.pl to run texhack if no GLUT
	Added a countdown timer to examples/texhack
	Fixed GL_X_BYTES in assign
	Fixed vertex.glsl to work on newer nvidia cards
	Implemented glutIgnoreKeyRepeat
	Implemented glutSetKeyRepeat
	Implemented glutForceJoystickFunc
	Added FreeGLUT support for cygwin builds
	Fixed builds for Apple's recent Mac OS changes
	Added README for building on Mac OS

	Chris Marshall
	Added support for building POGL within cygwin
	Added Config.pm support

	Sisyphus
	Added partial support for MinGW/dmake - not yet fully functional
	Added "clean" target to Makefile.PL

	Alex Dodge
	Added glutKeyboardUpFunc

0.56:	Bob "grafman" Free <grafman@graphcomp.com>
	Added $BUILD_VERSION
	Updated OpenGL::Array->new
	Added OpenGL::Array->length
	Added OpenGL::Array->bind
	Added OpenGL::Array->bound
	Added OpenGL::Array->new_scalar
	Added OpenGL::Array->new_pointer
	Added OpenGL::Array->update_pointer
	Updated OpenGL::Array->retrieve
	Updated OpenGL::Array->retrieve_data
	Added glVertexPointer_s
	Added glNormalPointer_s
	Added glColorPointer_s
	Added glIndexPointer_s
	Added glTexCoordPointer_s
	Added glEdgeFlagPointer_s
	Added glVertexPointerEXT_s
	Added glNormalPointerEXT_s
	Added glColorPointerEXT_s
	Added glIndexPointerEXT_s
	Added glTexCoordPointerEXT_s
	Added glEdgeFlagPointerEXT_s
	Added gluBuild1DMipmaps_c
	Added gluBuild2DMipmaps_c
	Added OpenGL::Image support to test.pl
	Updated typemap to add GLcharARB and GLhandleARB
	Implemented GL_EXT_texture_cube_map
	Implemented GL_ARB_shader_objects
	Implemented GL_ARB_fragment_shader
	Implemented GL_ARB_vertex_shader
	Implemented GL_ARB_shading_language_100
	Implemented GL_EXT_Cg_shader
	Updated test.pl to use OpenGL::Image and OpenGL::Shader

	Geoffrey Broadwell
	Fixed a bug in gl_pixelbuffer_size

0.55:	Bob "grafman" Free <grafman@graphcomp.com>
	Added OpenGL::Array->new_list
	Added OpenGL::Array->elements
	Added macro abstraction for wgl extensions
	Implemented GL_ARB_depth_texture
	Implemented GL_ARB_draw_buffers
	Implemented GL_ARB_fragment_program
	Implemented GL_ARB_fragment_program_shadow
	Implemented GL_ARB_half_float_pixel
	Implemented GL_ARB_multitexture
	Implemented GL_ARB_pixel_buffer_object
	Implemented GL_ARB_point_sprite
	Implemented GL_ARB_shadow
	Implemented GL_ARB_texture_border_clamp
	Implemented GL_ARB_texture_cube_map
	Implemented GL_ARB_texture_env_add
	Implemented GL_ARB_texture_float
	Implemented GL_ARB_texture_mirrored_repeat
	Implemented GL_ARB_texture_non_power_of_two
	Implemented GL_ARB_texture_rectangle
	Implemented GL_ARB_vertex_buffer_object
	Implemented GL_ARB_vertex_program
	Implemented GL_ATI_texture_float
	Implemented GL_ATI_texture_mirror_once
	Implemented GL_EXT_bgra
	Implemented GL_EXT_copy_texture
	Implemented GL_EXT_framebuffer_object
	Implemented GL_EXT_packed_pixels
	Implemented GL_EXT_pixel_buffer_object
	Implemented GL_EXT_rescale_normal
	Implemented GL_EXT_separate_specular_color
	Implemented GL_EXT_shadow_funcs
	Implemented GL_EXT_stencil_wrap
	Implemented GL_EXT_subtexture
	Implemented GL_EXT_textureD3
	Implemented GL_EXT_texture_env_dot3
	Implemented GL_EXT_texture_filter_anisotropic
	Implemented GL_EXT_texture_lod_bias
	implemented GL_EXT_texture_mirror_clamp
	implemented GL_EXT_vertex_array
	Implemented GL_HP_occlusion_test
	Implemented GL_IBM_rasterpos_clip
	Implemented GL_NV_blend_square
	Implemented GL_NV_copy_depth_to_color
	Implemented GL_NV_depth_clamp
	Implemented GL_NV_fog_distance
	Implemented GL_NV_fragment_program2
	Implemented GL_NV_fragment_program_option
	Implemented GL_NV_light_max_exponent
	Implemented GL_NV_packed_depth_stencil
	Implemented GL_NV_texgen_reflection
	Implemented GL_NV_texture_expand_normal
	Implemented GL_NV_texture_rectangle
	Implemented GL_NV_vertex_program2_option
	Implemented GL_NV_vertex_program3
	Implemented GL_S3_s3tc
	Implemented GL_SGIS_generate_mipmap
	Implemented GL_SGIS_texture_lod
	Implemented GL_SGIX_depth_texture
	Implemented GL_SGIX_shadow
	Implemented GL_SUN_slice_accum
	Added glDrawRangeElements_p
	Added glColorPointer_p
	Added glEdgeFlagPointer_p
	Added glIndexPointer_p
	Added glNormalPointer_p
	Added glTexCoordPointer_p
	Added glVertexPointer_p
	Added 'include' folder for updated GL header files
	Added 'utils' folder for header processing scripts
	Added glversion utility to enhance Makefile.PL
	Fixed compiler warnings in gl_util.c and OpenGL.xs
	Fixed glPolygonOffsetEXT bias mapping
	Fixed glDrawRangeElements_s code
	Fixed glGetPointerv_c params pointer
	Moved obsolete/deprecated extensions
	Added $glext_implemented hashref of implemented GL extensions
	Added glpCheckExtension
	Updated test.pl

	Ilya Zakharevich
	Updated support for SunRay

	Sherm Pendley
	Added MacOSX support

	Daiki Nomura
	Helped add FreeBSD support

0.54:	Martien Verbruggen fixed another Mesa limitation.
	#ifdef out unglob'ing: symbol not found on Solaris...

0.53:	Correct vertex_array detection in isosample.pl.
	Add more vertex_array constants (and move the definition earlier).
	Exchange (default) arguments for glp*: move display after window
	  (should not break old stuff, since there was/is no way to query
	   the display and window).
	New function $d = glpDisplay() (croaks on failure).
	Make glpOpenWindow() return the window handle.
	New functions with signatures
 void glpMoveResizeWindow(int x, int y, unsigned int width, unsigned int height, Window w, Display* display);
 void glpMoveWindow(int x, int y, Window w, Display* display);
 void glpResizeWindow(unsigned int width, unsigned int height, Window w, Display* display);
	  (w and display are optional).

0.52:	More of the portability, bug fixes, and examples.
	New option -steal for glpOpenWindow() to allow drawing into an
	  existing window (no "Visual" syncronization yet).
	GL_EXT_vertex_array done on the level of cpp.

0.51:	Portability enhancement (X and OS/2 PM), bug fixes, examples enhanced.
	_have_glp() should be used instead of _have_glx to test for
	  presence of glp* functions.
	Remap OpenGL 1.1 functions into GL_EXT_vertex_array interface
	if needed.