Mesa 6.5.3 Release Notes / April 27, 2007

Mesa 6.5.3 is a development release with many changes and new features. Mesa 7.0 is expected to follow shortly.

MD5 checksums

TBD

Shared library numbering

Mesa 6.5.3 supports the OpenGL 2.0/2.1 API. However, the (unix) shared library version is still 1.5 (i.e. libGL.so.1.5.xxxxxx). Bumping the shared library version to 2.x would cause linking problems with existing OpenGL applications. Since OpenGL 2.x is backward compatible with OpenGL 1.x the shared library version number doesn't have to be incremented (which would indicate an incompatible ABI).

Other OpenGL vendors name their OpenGL 2.x libraries libGL.so.1.0.xxxxx for the same reason.

New features

• OpenGL 2.0 and 2.1 API support.
• Entirely new Shading Language code generator. See the Shading Language page for more information.
• Much faster software execution of vertex, fragment shaders.
• New vertex buffer object (vbo) infrastructure
• Updated glext.h file (version 39)
• Updated glxext.h file (version 19)
• GL_MAX_DRAWBUFFERS is now 4 (software rendering) so "multiple render targets" are really supported.

Bug fixes

• Fog was errantly applied when a fragment shader was enabled (bug 9346)
• glPush/PopClientAttrib didn't handle VBO bindings correctly (bug 9445)
• With 32-bit Z buffer, the fragment Z of lines and points was sometimes wrong.
• GL_POST_CONVOLUTION_ALPHA_BIAS/SCALE was broken.
• 1D convolution state could effect 2D image transfers
• Overlapping glCopyPixels with negative Y zoom didn't work (bug 10521)
• Fixed a number of framebuffer/renderbuffer reference counting bugs
• Fixed a few bugs in software-emulated alpha planes
• Assorted minor bug fixes in glCopy/DrawPixels, glPixelZoom, etc.
• Assorted DRI driver bug fixes.
• Fixed a number of bugs that prevented "depth-peeling" rendering from working.

Internal code changes

• Old array_cache module replaced by new vbo module. All geometry rendering is now cast in the form of vertex buffer objects.
• Massive changes to the Shading Language compiler and related state.
• Vertex/fragment shaders are compiled into GPU instructions and programs very similar to GL_ARB_vertex/fragment_program.
• Vertex and fragment programs are executed with the same code now.
• The SSE-optimized vertex program path has been removed since it didn't support more than 12 temp registers, didn't support branching/looping, etc.

To Do (someday) items

• Switch to freeglut
• Fix linux-glide target/driver.
• Improved lambda and derivative calculation for frag progs.

Driver Status

Driver			Status
----------------------	----------------------
DRI drivers		varies with the driver
XMesa/GLX (on Xlib)	implements OpenGL 2.1
OSMesa (off-screen)	implements OpenGL 2.1
Windows/Win32		implements OpenGL 2.1
Glide (3dfx Voodoo1/2)	implements OpenGL 1.3
SVGA			unsupported
Wind River UGL		unsupported
DJGPP			unsupported
GGI			unsupported
BeOS			unsupported
Allegro			unsupported
D3D			unsupported