Workaround a bug/deficiency in recent linux intel video drivers
git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10268 387891d4-d844-0410-90c0-e4c51a9137d3
fix the old bug that didn't report a missing extension name properly
get rid of the message that says to use D3D, that's not normally going to be an option anyway
add ARB_point_sprite support, mostly for fun since no code will actually use it until after 3.6.10
newer OpenGL extension support
add GL_ARB_texture_rectangle support for non-power-of-2 textures as interface graphics
add cubemap reading and writing support to DDS loader
fix bug in DDS loader that made compressed images with mipmaps use more memory than they really required
add support for a default envmap named "cubemap.dds"
new mission flag "$Environment Map:" to use a pre-existing envmap
minor cleanup of compiler warning messages
get rid of wasteful math from gr_set_proj_matrix()
remove extra gr_set_*_matrix() calls from starfield.cpp as there was no longer a reason for them to be there
clean up bmpman flags in reguards to cubemaps and render targets
disable D3D envmap code until it can be upgraded to current level of code
remove bumpmap code from OpenGL stuff (sorry but it was getting in the way, if it was more than copy-paste it would be worth keeping)
replace gluPerspective() call with glFrustum() call, it's a lot less math this way and saves the extra function call
use nicest hints for texture compression, should improve quality a little
when reporting compressed sizes to debug log make ani size be total, not per frame
better support for mipmaps and mipmap filtering
add reg option "TextureFilter" to set bilinear or trilinear filter
clean up bitmap_id/bitmap_handle/texture_handle madness that made things difficult to understand
small fix for using 24-bit images on 16-bit bpp visual (untested)
add -img2dds support
cleanup some D3D stuff (missing a lot since the old code is so unstable I couldn't get it working like I wanted)
some minor OGL cleanup and small performance changes
converge the various pcx_read_bitmap* functions into one
cleanup/rename/remove some cmdline options
speed up gr_opengl_flip() just a tad
inverted gamma slider fix that Sticks made to D3D
possible fix for ATI green screens
move opengl_check_for_errors() out of gropentnl so we can use it everywhere
fix logged OGL info from debug builds to be a little more readable
if an extension is found but required function is not then fail
try to optimize glDrawRangeElements so we are not rendering more than the card is optimized for
some 2d matrix usage checks
Swifty