Mesa 3.5 release notes
- Month ??, 2000
+ June 21, 2001
PLEASE READ!!!!
------------
Mesa uses an even/odd version number scheme like the Linux kernel.
-Odd numbered versions (such as 3.3) designate new developmental releases.
+Odd numbered versions (such as 3.5) 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.
+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.
-Details to come...
+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.
----------------------------------------------------------------------
-$Id: RELNOTES-3.5,v 1.1 2000/07/31 13:58:04 brianp Exp $
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