docs/RELNOTES-3.5

   1
   2                          Mesa 3.5 release notes
   3
   4                              May ??, 2001
   5
   6                              PLEASE READ!!!!
   7
   8
   9
  10 Introduction
  11 ------------
  12
  13 Mesa uses an even/odd version number scheme like the Linux kernel.
  14 Odd numbered versions (such as 3.5) designate new developmental releases.
  15 Even numbered versions (such as 3.4) designate stable releases.
  16
  17 The biggest change in Mesa 3.5 is a complete overhaul of the source
  18 code in order to make it more modular.  This was driven by the DRI
  19 hardware drivers.  It simplifies the DRI drivers and opens the door
  20 to hardware transform/clip/lighting (TCL).
  21
  22
  23
  24 Driver Support
  25 --------------
  26
  27 The device driver interface in Mesa 3.5 has changed a lot since Mesa 3.4
  28 Not all of the older Mesa drivers have been updated.  Here's the status:
  29
  30 Driver                  Status
  31 ----------------------  -----------
  32 XMesa (Xlib)            updated
  33 OSMesa (off-screen)     updated
  34 FX (3dfx Voodoo1/2)     updated
  35 SVGA                    updated
  36 GGI                     not updated
  37 Windows/Win32           not updated
  38 DOS/DJGPP               not updated
  39 BeOS                    not updated
  40 Allegro                 not updated
  41 D3D                     not updated
  42 DOS                     not updated
  43
  44 We're looking for volunteers to update the remaining drivers.  Please
  45 post to the Mesa3d-dev mailing list if you can help.
  46
  47
  48
  49 GLU 1.3
  50 -------
  51
  52 Mesa 3.5 includes the SGI Sample Implementation (SI) GLU library.
  53 This version of GLU supports the GLU 1.3 specification.  The old
  54 Mesa GLU library implemented the 1.1 specification.  The SI GLU
  55 library should work much better.
  56
  57 You'll need a C++ compiler to compile the SI GLU library.  This may
  58 be a problem on some systems.
  59
  60
  61
  62 New Extensions
  63 --------------
  64
  65 GL_EXT_convolution
  66         Adds image convolution to glRead/Copy/DrawPixels/TexImage.
  67
  68 GL_ARB_imaging
  69         This is the optional imaging subset of OpenGL 1.2.
  70         It's the GL_EXT_convolution, GL_HP_convolution_border_modes,
  71         GL_EXT_histogram, GL_EXT_color_table, GL_EXT_color_subtable
  72         GL_EXT_blend_color, GL_EXT_blend_minmax, GL_EXT_blend_subtract
  73         and GL_SGI_color_matrix extensions all rolled together.
  74         This is supported in all software renderers but not in all
  75         hardware drivers (3dfx for example).
  76
  77 GL_ARB_texture_compression
  78         This is supported in Mesa but only used by the 3dfx DRI drivers
  79         for Voodoo4 and later.
  80
  81 GL_ARB_texture_env_add
  82         This is identical to GL_EXT_texture_env_add.
  83
  84 GL_NV_blend_square
  85         Adds extra blend source and dest factors which allow squaring
  86         of color values.
  87
  88 GL_EXT_fog_coord
  89         Allows specification of a per-vertex fog coordinate instead of
  90         having fog always computed from the eye distance.
  91
  92 GL_EXT_secondary_color
  93         Allows specifying the secondary (specular) color for each vertex
  94         instead of getting it only from lighting in GL_SEPARATE_SPECULAR_COLOR
  95         mode.
  96
  97 GL_ARB_texture_env_combine
  98         Basically the same as GL_EXT_texture_env_combine
  99
 100 GL_ARB_texture_env_add extension
 101         Texture addition mode.
 102
 103 GL_ARB_texture_env_dot3 extension
 104         Dot product texture environment.
 105
 106 GL_ARB_texture_border_clamp
 107         Adds GL_CLAMP_TO_BORDER_ARB texture wrap mode
 108
 109 GL_SGIX_depth_texture, GL_SGIX_shadow and GL_SGIX_shadow_ambient
 110         Implements a shadow casting algorithm based on depth map textures
 111
 112
 113
 114 libOSMesa.so
 115 ------------
 116
 117 libOSMesa.so is a new library which contains the OSMesa interface for
 118 off-screen rendering.  Apps which need the OSMesa interface should link
 119 with both -lOSMesa and -lGL.  This change was made so that stand-alone
 120 Mesa works the same way as XFree86/DRI's libGL.
 121
 122
 123
 124 Device Driver Changes / Core Mesa Changes
 125 -----------------------------------------
 126
 127 The ctx->Driver.LogicOp() function has been removed.  It used to
 128 be called during state update in order to determine if the driver
 129 could do glLogicOp() operations, and if not, set the SWLogicOpEnabled
 130 flag.  Drivers should instead examine the LogicOp state themselves
 131 and choose specialized point, line, and triangle functions appropriately,
 132 or fall back to software rendering.  The Xlib driver was the only driver
 133 to use this function.  And since the Xlib driver no longer draws
 134 points, lines or triangles using Xlib, the LogicOp function isn't needed.
 135
 136 The ctx->Driver.Dither() function has been removed.  Drivers should
 137 detect dither enable/disable via ctx->Driver.Enable() instead.
 138
 139 The ctx->Driver.IndexMask() and ctx->Driver.ColorMask() functions
 140 are now just called from glIndexMask and glColorMask like the other
 141 GL state-changing functions.  They are no longer called from inside
 142 gl_update_state().  Also, they now return void.  The change was made
 143 mostly for sake of uniformity.
 144
 145 The NEW_DRVSTATE[0123] flags have been removed.  They weren't being used
 146 and are obsolete w.r.t. the way state updates are done in DRI drivers.
 147
 148
 149 Removed obsolete gl_create_visual() and gl_destroy_visual().
 150
 151 Renamed functions (new namespace):
 152
 153 old                             new
 154 gl_create_framebuffer           _mesa_create_framebuffer
 155 gl_destroy_framebuffer          _mesa_destroy_framebuffer
 156 gl_create_context               _mesa_create_context
 157 gl_destroy_context              _mesa_destroy_context
 158 gl_context_initialize           _mesa_context_initialize
 159 gl_copy_context                 _mesa_copy_context
 160 gl_make_current                 _mesa_make_current
 161 gl_make_current2                _mesa_make_current2
 162 gl_get_current_context          _mesa_get_current_context
 163 gl_flush_vb                     _mesa_flush_vb
 164 gl_warning                      _mesa_warning
 165 gl_compile_error                _mesa_compile_error
 166
 167
 168 All the drivers have been updated, but not all of them have been
 169 tested since I can't test some platforms (DOS, Windows, Allegro, etc).
 170
 171
 172 X/Mesa Driver
 173 -------------
 174
 175 The source files for the X/Mesa driver in src/X have been renamed.
 176 The xmesa[1234].c files are gone.  The new files are xm_api.c,
 177 xm_dd.c, xm_line.c, xm_span.c and xm_tri.c.
 178
 179
 180
 181 Multitexture
 182 ------------
 183
 184 Eight texture units are now supported by default.
 185
 186
 187
 188 OpenGL SI related changes
 189 -------------------------
 190
 191 In an effort to make Mesa's internal interfaces more like the OpenGL
 192 SI interfaces, a number of changes have been made:
 193
 194 1. Importing the SI's glcore.h file which defines a number of
 195 interface structures like __GLimports and __GLexports.
 196
 197 2. Renamed "struct gl_context" to "struct __GLcontextRec".
 198
 199 3. Added __glCoreCreateContext() and __glCoreNopDispatch() functions.
 200
 201 4. The GLcontext member Visual is no longer a pointer.
 202
 203 5. New file: imports.c to setup default import functions for Mesa.
 204
 205
 206
 207
 208 16-bit color channels
 209 ---------------------
 210
 211 There's experimental support for 16-bit color channels (64-bit pixels)
 212 in Mesa 3.5.  Only the OSMesa interface can be used for 16-bit rendering.
 213 Type "make linux-osmesa16" in the top-level directory to build the
 214 special libOSMesa16.so library.
 215
 216 This hasn't been tested very thoroughly yet so please file bug reports
 217 if you have trouble.
 218
 219 In the future I hope to implement support for 32-bit, floating point
 220 color channels.
 221
 222 ----------------------------------------------------------------------
 223 $Id: RELNOTES-3.5,v 1.13 2001/05/04 17:42:53 brianp Exp $