112 lines
3.4 KiB
Groff
112 lines
3.4 KiB
Groff
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Mesa 6.1 release notes
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August 18, 2004
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PLEASE READ!!!!
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Introduction
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------------
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Mesa uses an even/odd version number scheme like the Linux kernel.
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Odd numbered versions (such as 6.1) designate new developmental releases.
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Even numbered versions (such as 6.0) designate stable releases.
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New Features
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------------
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Half-precision floating point (GLhalf) pixel formats are supported
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in Mesa, but the feature isn't exposed yet since the ARB extension
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hasn't been finalized yet.
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Texture image handling
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----------------------
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The code which implements image conversion, pixel transfer ops, etc
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for glTexImage commands has been rewritten.
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Now the gl_texture_format struct has a new StoreImage function
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pointer. Each texture format must implement this function. The
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function is totally responsible for converting the user's texture
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image into the specific format. A few helper functions makes this
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relatively simple.
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Overall, the code is much simpler, cleaner and easier to work with
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now. Adding new texture formats is straight-forward and there's no
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longer any distinction between "hardware" and "software" formats.
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Finally, the code for compressed texture images has been reorganized
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as well.
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Removed files:
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texutil.c
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texutil.h
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texutil_tmp.h
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New files:
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texcompress_s3tc.c
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texcompress_fxt1.c
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Driver / context changes
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------------------------
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The _mesa_create_context() and _mesa_initialize_context() function
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parameters have changed. They now take a pointer to a struct
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dd_function_table. Drivers can initialize this table by calling
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_mesa_init_driver_functions(). Drivers should then plug in the special
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functions they implement. In particular, the ctx->Driver.NewTextureObject
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pointer _must_ be set so that the default texture objects created in
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_mesa_create/initialize_context() are correctly built.
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The _mesa_init_driver_functions() function allows a lot of redundant code
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to be removed from the device drivers (such as initializing
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ctx->Driver.Accum to point to _swrast_Accum). Adding new functions to
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the dd_function_table can be done with less hassle since the pointer can
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be initialized in _mesa_init_driver_functions() rather than in _all_ the
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drivers.
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Device Drivers
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--------------
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Mesa advertises itself as supporting OpenGL 1.2, 1.3, 1.4 or 1.5
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depending on the device driver's capabilities. For example, if the
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driver enables all the ARB extensions which are part of OpenGL 1.5
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then glGetString(GL_VERSION) will return "1.5". Otherwise, it'll
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return "1.4" or the next lower version that implements all required
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functionality.
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A number of Mesa's software drivers haven't been actively maintained for
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some time. We rely on volunteers to maintain many of the drivers.
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Here's the current status of all included drivers:
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Driver Status
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---------------------- ---------------------
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XMesa (Xlib) implements OpenGL 1.5
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OSMesa (off-screen) implements OpenGL 1.5
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Glide (3dfx Voodoo1/2) implements OpenGL 1.3
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SVGA implements OpenGL 1.3
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Wind River UGL implements OpenGL 1.3
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Windows/Win32 implements OpenGL 1.5
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DJGPP implements OpenGL 1.5
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GGI implements OpenGL 1.3
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BeOS implements OpenGL 1.5
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Allegro needs updating
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D3D needs updating
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Other Changes
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-------------
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See the VERSIONS file for more details about bug fixes, etc. in Mesa 6.1.
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----------------------------------------------------------------------
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