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Mesa 3.5 release notes
Month ??, 2001
PLEASE READ!!!!
Introduction
------------
Mesa uses an even/odd version number scheme like the Linux kernel.
Odd numbered versions (such as 3.3) designate new developmental releases.
Even numbered versions (such as 3.4) designate stable releases.
The internal structure of Mesa 3.5 is (will be) changed so that it
is more modular. The motivation is better support of 3D hardware
such as T&L hardware in which much of core Mesa isn't needed.
Details to come...
GLU 1.3
-------
Mesa 3.5 includes the SGI Sample Implementation (SI) GLU library.
This version of GLU supports the GLU 1.3 specification. The old
Mesa GLU library implemented the 1.1 specification. The SI GLU
library should work much better.
You'll need a C++ compiler to compile the SI GLU library. This may
be a problem on some systems.
New Extensions
--------------
GL_EXT_convolution
Adds image convolution to glRead/Copy/DrawPixels/TexImage.
GL_ARB_imaging
This is the optional imaging subset of OpenGL 1.2.
It's the GL_EXT_convolution, GL_HP_convolution_border_modes,
GL_EXT_histogram, GL_EXT_color_table, GL_EXT_color_subtable
GL_EXT_blend_color, GL_EXT_blend_minmax, GL_EXT_blend_subtract
and GL_SGI_color_matrix extensions all rolled together.
This is supported in all software renderers but not in all
hardware drivers (3dfx for example).
GL_ARB_texture_compression
This is supported in Mesa but only used by the 3dfx DRI drivers
for Voodoo4 and later.
GL_ARB_texture_env_add
This is identical to GL_EXT_texture_env_add.
GL_NV_blend_square
Adds extra blend source and dest factors which allow squaring
of color values.
GL_EXT_fog_coord
Allows specification of a per-vertex fog coordinate instead of
having fog always computed from the eye distance.
GL_EXT_secondary_color
Allows specifying the secondary (specular) color for each vertex
instead of getting it only from lighting in GL_SEPARATE_SPECULAR_COLOR
mode.
GL_ARB_texture_env_combine
Basically the same as GL_EXT_texture_env_combine
GL_ARB_texture_env_add extension
Texture addition mode.
GL_ARB_texture_env_dot3 extension
Dot product texture environment.
GL_ARB_texture_border_clamp
Adds GL_CLAMP_TO_BORDER_ARB texture wrap mode
GL_SGIX_depth_texture, GL_SGIX_shadow and GL_SGIX_shadow_ambient
Implements a shadow casting algorithm based on depth map textures
libOSMesa.so
------------
libOSMesa.so is a new library which contains the OSMesa interface for
off-screen rendering. Apps which need the OSMesa interface should link
with both -lOSMesa and -lGL. This change was made so that stand-alone
Mesa works the same way as XFree86/DRI's libGL.
Device Driver Changes / Core Mesa Changes
-----------------------------------------
The ctx->Driver.LogicOp() function has been removed. It used to
be called during state update in order to determine if the driver
could do glLogicOp() operations, and if not, set the SWLogicOpEnabled
flag. Drivers should instead examine the LogicOp state themselves
and choose specialized point, line, and triangle functions appropriately,
or fall back to software rendering. The Xlib driver was the only driver
to use this function. And since the Xlib driver no longer draws
points, lines or triangles using Xlib, the LogicOp function isn't needed.
The ctx->Driver.Dither() function has been removed. Drivers should
detect dither enable/disable via ctx->Driver.Enable() instead.
The ctx->Driver.IndexMask() and ctx->Driver.ColorMask() functions
are now just called from glIndexMask and glColorMask like the other
GL state-changing functions. They are no longer called from inside
gl_update_state(). Also, they now return void. The change was made
mostly for sake of uniformity.
The NEW_DRVSTATE[0123] flags have been removed. They weren't being used
and are obsolete w.r.t. the way state updates are done in DRI drivers.
Removed obsolete gl_create_visual() and gl_destroy_visual().
Renamed functions (new namespace):
old new
gl_create_framebuffer _mesa_create_framebuffer
gl_destroy_framebuffer _mesa_destroy_framebuffer
gl_create_context _mesa_create_context
gl_destroy_context _mesa_destroy_context
gl_context_initialize _mesa_context_initialize
gl_copy_context _mesa_copy_context
gl_make_current _mesa_make_current
gl_make_current2 _mesa_make_current2
gl_get_current_context _mesa_get_current_context
gl_flush_vb _mesa_flush_vb
gl_warning _mesa_warning
gl_compile_error _mesa_compile_error
All the drivers have been updated, but not all of them have been
tested since I can't test some platforms (DOS, Windows, Allegro, etc).
X/Mesa Driver
-------------
The source files for the X/Mesa driver in src/X have been renamed.
The xmesa[1234].c files are gone. The new files are xm_api.c,
xm_dd.c, xm_line.c, xm_span.c and xm_tri.c.
Multitexture
------------
Three texture units are now supported by default. We'll allow more
than three texture units when we fix some bitfield issues. In at least
one place we have a 32-bit bitfield which is fully allocated, leaving
no space for texture unit #3 or higher.
The TEXTURE1_1D, TEXTURE1_2D, etc constants may go away in the future.
Currently, they're only used in the ctx->Texture.ReallyEnabled field.
This bitfield is just a conglomerate of ctx->Texture.Unit[i].ReallyEnabled
for all <i> texture units. ctx->Texture.ReallyEnabled may become a
GLboolean. Then, drivers will have to loop over the texture units to
examine ctx->Texture.Unit[i].ReallyEnabled.
OpenGL SI related changes
-------------------------
In an effort to make Mesa's internal interfaces more like the OpenGL
SI interfaces, a number of changes have been made:
1. Importing the SI's glcore.h file which defines a number of
interface structures like __GLimports and __GLexports.
2. Renamed "struct gl_context" to "struct __GLcontextRec".
3. Added __glCoreCreateContext() and __glCoreNopDispatch() functions.
4. The GLcontext member Visual is no longer a pointer.
5. New file: imports.c to setup default import functions for Mesa.
Internal color values
---------------------
Previously, Mesa treated color channel values as GLubytes in [0,255].
Mesa 3.5 uses the GLchan datatype for color channel values. In the
future it will be possible to define GLchan to be larger than a byte
in order to support high-precision colors.
Many, many occurances of GLubyte have been replaced with GLchan
and many occurances of the number 255 have been replaced with CHAN_MAX.
Support for CHAN_BITS > 8 is not ready yet but will be eventually.
----------------------------------------------------------------------
$Id: RELNOTES-3.5,v 1.11 2001/04/20 02:34:12 brianp Exp $
|
