docs/RELNOTES-3.5

   1
   2                          Mesa 3.5 release notes
   3
   4                              June 21, 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).  Keith Whitwell can take
  21 the credit for that.
  22
  23
  24
  25 Driver Support
  26 --------------
  27
  28 The device driver interface in Mesa 3.5 has changed a lot since Mesa 3.4
  29 Not all of the older Mesa drivers have been updated.  Here's the status:
  30
  31 Driver                  Status
  32 ----------------------  -----------
  33 XMesa (Xlib)            updated
  34 OSMesa (off-screen)     updated
  35 FX (3dfx Voodoo1/2)     updated
  36 SVGA                    updated
  37 GGI                     not updated
  38 Windows/Win32           not updated
  39 DOS/DJGPP               not updated
  40 BeOS                    not updated
  41 Allegro                 not updated
  42 D3D                     not updated
  43 DOS                     not updated
  44
  45 We're looking for volunteers to update the remaining drivers.  Please
  46 post to the Mesa3d-dev mailing list if you can help.
  47
  48
  49
  50 GLU 1.3
  51 -------
  52
  53 Mesa 3.5 includes the SGI Sample Implementation (SI) GLU library.
  54 This version of GLU supports the GLU 1.3 specification.  The old
  55 Mesa GLU library implemented the 1.1 specification.  The SI GLU
  56 library should work much better.
  57
  58 You'll need a C++ compiler to compile the SI GLU library.  This may
  59 be a problem on some systems.
  60
  61
  62
  63 New Extensions
  64 --------------
  65
  66 GL_EXT_convolution
  67         Adds image convolution to glRead/Copy/DrawPixels/TexImage.
  68
  69 GL_ARB_imaging
  70         This is the optional imaging subset of OpenGL 1.2.
  71         It's the GL_EXT_convolution, GL_HP_convolution_border_modes,
  72         GL_EXT_histogram, GL_EXT_color_table, GL_EXT_color_subtable
  73         GL_EXT_blend_color, GL_EXT_blend_minmax, GL_EXT_blend_subtract
  74         and GL_SGI_color_matrix extensions all rolled together.
  75         This is supported in all software renderers but not in all
  76         hardware drivers (3dfx for example).
  77
  78 GL_ARB_texture_compression
  79         This is supported in Mesa but only used by the 3dfx DRI drivers
  80         for Voodoo4 and later.
  81
  82 GL_ARB_texture_env_add
  83         This is identical to GL_EXT_texture_env_add.
  84
  85 GL_NV_blend_square
  86         Adds extra blend source and dest factors which allow squaring
  87         of color values.
  88
  89 GL_EXT_fog_coord
  90         Allows specification of a per-vertex fog coordinate instead of
  91         having fog always computed from the eye distance.
  92
  93 GL_EXT_secondary_color
  94         Allows specifying the secondary (specular) color for each vertex
  95         instead of getting it only from lighting in GL_SEPARATE_SPECULAR_COLOR
  96         mode.
  97
  98 GL_ARB_texture_env_combine
  99         Basically the same as GL_EXT_texture_env_combine
 100
 101 GL_ARB_texture_env_add extension
 102         Texture addition mode.
 103
 104 GL_ARB_texture_env_dot3 extension
 105         Dot product texture environment.
 106
 107 GL_ARB_texture_border_clamp
 108         Adds GL_CLAMP_TO_BORDER_ARB texture wrap mode
 109
 110 GL_SGIX_depth_texture, GL_SGIX_shadow and GL_SGIX_shadow_ambient
 111         Implements a shadow casting algorithm based on depth map textures
 112
 113 GL_SGIS_generate_mipmap
 114         Automatically generate lower mipmap images whenever the base mipmap
 115         image is changed with glTexImage, glCopyTexImage, etc.
 116
 117
 118
 119 libOSMesa.so
 120 ------------
 121
 122 libOSMesa.so is a new library which contains the OSMesa interface for
 123 off-screen rendering.  Apps which need the OSMesa interface should link
 124 with both -lOSMesa and -lGL.  This change was made so that stand-alone
 125 Mesa works the same way as XFree86/DRI's libGL.
 126
 127
 128
 129 Device Driver Changes / Core Mesa Changes
 130 -----------------------------------------
 131
 132 The ctx->Driver.LogicOp() function has been removed.  It used to
 133 be called during state update in order to determine if the driver
 134 could do glLogicOp() operations, and if not, set the SWLogicOpEnabled
 135 flag.  Drivers should instead examine the LogicOp state themselves
 136 and choose specialized point, line, and triangle functions appropriately,
 137 or fall back to software rendering.  The Xlib driver was the only driver
 138 to use this function.  And since the Xlib driver no longer draws
 139 points, lines or triangles using Xlib, the LogicOp function isn't needed.
 140
 141 The ctx->Driver.Dither() function has been removed.  Drivers should
 142 detect dither enable/disable via ctx->Driver.Enable() instead.
 143
 144 The ctx->Driver.IndexMask() and ctx->Driver.ColorMask() functions
 145 are now just called from glIndexMask and glColorMask like the other
 146 GL state-changing functions.  They are no longer called from inside
 147 gl_update_state().  Also, they now return void.  The change was made
 148 mostly for sake of uniformity.
 149
 150 The NEW_DRVSTATE[0123] flags have been removed.  They weren't being used
 151 and are obsolete w.r.t. the way state updates are done in DRI drivers.
 152
 153
 154 Removed obsolete gl_create_visual() and gl_destroy_visual().
 155
 156 Renamed functions (new namespace):
 157
 158 old                             new
 159 gl_create_framebuffer           _mesa_create_framebuffer
 160 gl_destroy_framebuffer          _mesa_destroy_framebuffer
 161 gl_create_context               _mesa_create_context
 162 gl_destroy_context              _mesa_destroy_context
 163 gl_context_initialize           _mesa_context_initialize
 164 gl_copy_context                 _mesa_copy_context
 165 gl_make_current                 _mesa_make_current
 166 gl_make_current2                _mesa_make_current2
 167 gl_get_current_context          _mesa_get_current_context
 168 gl_flush_vb                     _mesa_flush_vb
 169 gl_warning                      _mesa_warning
 170 gl_compile_error                _mesa_compile_error
 171
 172
 173 All the drivers have been updated, but not all of them have been
 174 tested since I can't test some platforms (DOS, Windows, Allegro, etc).
 175
 176
 177 X/Mesa Driver
 178 -------------
 179
 180 The source files for the X/Mesa driver in src/X have been renamed.
 181 The xmesa[1234].c files are gone.  The new files are xm_api.c,
 182 xm_dd.c, xm_line.c, xm_span.c and xm_tri.c.
 183
 184
 185
 186 Multitexture
 187 ------------
 188
 189 Eight texture units are now supported by default.
 190
 191
 192
 193 OpenGL SI related changes
 194 -------------------------
 195
 196 In an effort to make Mesa's internal interfaces more like the OpenGL
 197 SI interfaces, a number of changes have been made:
 198
 199 1. Importing the SI's glcore.h file which defines a number of
 200 interface structures like __GLimports and __GLexports.
 201
 202 2. Renamed "struct gl_context" to "struct __GLcontextRec".
 203
 204 3. Added __glCoreCreateContext() and __glCoreNopDispatch() functions.
 205
 206 4. The GLcontext member Visual is no longer a pointer.
 207
 208 5. New file: imports.c to setup default import functions for Mesa.
 209
 210
 211
 212
 213 16-bit color channels
 214 ---------------------
 215
 216 There's experimental support for 16-bit color channels (64-bit pixels)
 217 in Mesa 3.5.  Only the OSMesa interface can be used for 16-bit rendering.
 218 Type "make linux-osmesa16" in the top-level directory to build the
 219 special libOSMesa16.so library.
 220
 221 This hasn't been tested very thoroughly yet so please file bug reports
 222 if you have trouble.
 223
 224 In the future I hope to implement support for 32-bit, floating point
 225 color channels.
 226
 227 ----------------------------------------------------------------------