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-
- Mesa 3.5 release notes
-
- June 21, 2001
-
- PLEASE READ!!!!
-
-
-
-Introduction
-------------
-
-Mesa uses an even/odd version number scheme like the Linux kernel.
-Odd numbered versions (such as 3.5) designate new developmental releases.
-Even numbered versions (such as 3.4) designate stable releases.
-
-The biggest change in Mesa 3.5 is a complete overhaul of the source
-code in order to make it more modular. This was driven by the DRI
-hardware drivers. It simplifies the DRI drivers and opens the door
-to hardware transform/clip/lighting (TCL). Keith Whitwell can take
-the credit for that.
-
-
-
-Driver Support
---------------
-
-The device driver interface in Mesa 3.5 has changed a lot since Mesa 3.4
-Not all of the older Mesa drivers have been updated. Here's the status:
-
-Driver Status
----------------------- -----------
-XMesa (Xlib) updated
-OSMesa (off-screen) updated
-FX (3dfx Voodoo1/2) updated
-SVGA updated
-GGI not updated
-Windows/Win32 not updated
-DOS/DJGPP not updated
-BeOS not updated
-Allegro not updated
-D3D not updated
-DOS not updated
-
-We're looking for volunteers to update the remaining drivers. Please
-post to the Mesa3d-dev mailing list if you can help.
-
-
-
-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
-
-GL_SGIS_generate_mipmap
- Automatically generate lower mipmap images whenever the base mipmap
- image is changed with glTexImage, glCopyTexImage, etc.
-
-
-
-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
-------------
-
-Eight texture units are now supported by default.
-
-
-
-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.
-
-
-
-
-16-bit color channels
----------------------
-
-There's experimental support for 16-bit color channels (64-bit pixels)
-in Mesa 3.5. Only the OSMesa interface can be used for 16-bit rendering.
-Type "make linux-osmesa16" in the top-level directory to build the
-special libOSMesa16.so library.
-
-This hasn't been tested very thoroughly yet so please file bug reports
-if you have trouble.
-
-In the future I hope to implement support for 32-bit, floating point
-color channels.
-
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