13 Mesa uses an even/odd version number scheme like the Linux kernel.
14 Even numbered versions (such as 4.0) designate stable releases.
15 Odd numbered versions (such as 4.1) designate new developmental releases.
18 New Features in Mesa 4.1
19 ------------------------
21 New extensions. Docs at http://oss.sgi.com/projects/ogl-sample/registry/
25 NVIDIA's vertex programming extension
27 GL_NV_vertex_program1_1
29 A few features built on top of GL_NV_vertex_program
33 This is the ARB-approved version of GL_MESA_window_pos
37 This is the ARB-approved version of GL_SGIX_depth_texture.
38 It allows depth (Z buffer) data to be stored in textures.
39 This is used by GL_ARB_shadow
43 Shadow mapping with depth textures.
44 This is the ARB-approved version of GL_SGIX_shadow.
48 Allows one to specify the luminance of shadowed pixels.
49 This is the ARB-approved version of GL_SGIX_shadow_ambient.
53 Extends the set of GL_ARB_shadow texture comparision functions to
54 include all eight of standard OpenGL dept-test functions.
56 GL_ARB_point_parameters
58 This is basically the same as GL_EXT_point_parameters.
60 GL_ARB_texture_env_crossbar
62 Allows any texture combine stage to reference any texture source unit.
66 For rendering points as textured quads. Useful for particle effects.
68 GL_NV_texture_rectangle
70 Allows one to use textures with sizes that are not powers of two.
71 Note that mipmapping and several texture wrap modes are not allowed.
73 GL_EXT_multi_draw_arrays
75 Allows arrays of vertex arrays to be rendered with one call.
82 A number of Mesa's software drivers haven't been actively maintained for
83 some time. We rely on volunteers to maintain many of these drivers.
84 Here's the current status of all included drivers:
88 ---------------------- ---------------------
89 XMesa (Xlib) implements OpenGL 1.3
90 OSMesa (off-screen) implements OpenGL 1.3
91 FX (3dfx Voodoo1/2) implements OpenGL 1.3
92 SVGA implements OpenGL 1.3
93 Wind River UGL implements OpenGL 1.3
94 Windows/Win32 implements OpenGL 1.3
95 DOS/DJGPP implements OpenGL 1.3
96 GGI implements OpenGL 1.3
97 BeOS needs updating (underway)
98 Allegro needs updating
107 When moving from Mesa 4.0.x to Mesa 4.1 there are a number of things
108 you may have to update.
110 1. _mesa_create_context() changes. This function now takes a pointer to
111 a __GLimports object. The __GLimports structure contains function
112 pointers to system functions like fprintf(), malloc(), etc.
113 The _mesa_init_default_imports() function can be used to initialize
114 a __GLimports object. Most device drivers (like the DRI drivers)
121 XXX Things To Do Yet XXXX
122 -------------------------
124 Verify x86 code for normal transformation works with new 4-element normal
125 vector arrays. Pretty sure the SSE code is wrong.
127 Finish up NV_vertex_program support for evaluators. Vertex arrays seem
128 to work as of 4/21/2002.
130 Allow multiple points to be rendered into one sw_span.
132 improve point/line rendering speed.
134 _tnl_end() has flushing forced on.
136 readpixels from stencil/z should respect ctx->ReadBuffer
138 glVertexAttrib*NV(index>15) should cause an error.
140 isosurf with vertex program exhibits some missing triangles (probably
141 when recycling the vertex buffer for long prims).
148 If you're porting a DRI or other driver from Mesa 4.0.x to Mesa 4.1 here
149 are some things to change:
151 1. ctx->Texture._ReallyEnabled is obsolete.
153 Since there are now 5 texture targets (1D, 2D, 3D, cube and rect) that
154 left room for only 6 units (6*5 < 32) in this field.
155 This field is being replaced by ctx->Texture._EnabledUnits which has one
156 bit per texture unit. If the bit k of _EnabledUnits is set, that means
157 ctx->Texture.Unit[k]._ReallyEnabled is non-zero. You'll have to look at
158 ctx->Texture.Unit[k]._ReallyEnabled to learn if the 1D, 2D, 3D, cube or
159 rect texture is enabled for unit k.
161 This also means that the constants TEXTURE1_*, TEXTURE2_*, etc are
164 The tokens TEXTURE0_* have been replaced as well (since there's no
165 significance to the "0" part:
168 TEXTURE0_1D TEXTURE_1D_BIT
169 TEXTURE0_2D TEXTURE_2D_BIT
170 TEXTURE0_3D TEXTURE_3D_BIT
171 TEXTURE0_CUBE TEXTURE_CUBE_BIT
172 <none> TEXTURE_RECT_BIT
174 These tokens are only used for the ctx->Texture.Unit[i].Enabled and
175 ctx->Texture.Unit[i]._ReallyEnabled fields. Exactly 0 or 1 bit will
176 be set in _ReallyEnabled at any time!
178 Q: "What's the purpose of Unit[i].Enabled vs Unit[i]._ReallyEnabled?"
179 A: The user can enable GL_TEXTURE_1D, GL_TEXTURE_2D, etc for any
180 texure unit all at once (an unusual thing to do).
181 OpenGL defines priorities that basically say GL_TEXTURE_2D has
182 higher priority than GL_TEXTURE_1D, etc. Also, just because a
183 texture target is enabled by the user doesn't mean we'll actually
184 use that texture! If a texture object is incomplete (missing mip-
185 map levels, etc) it's as if texturing is disabled for that target.
186 The _ReallyEnabled field will have a bit set ONLY if the texture
187 target is enabled and complete. This spares the driver writer from
188 examining a _lot_ of GL state to determine which texture target is
192 2. Tnl tokens changes
194 During the implementation of GL_NV_vertex_program some of the vertex
195 buffer code was changed. Specifically, the VERT_* bits defined in
196 tnl/t_context.h have been renamed to better match the conventions of
197 GL_NV_vertex_program. The old names are still present but obsolete.
198 Drivers should use the newer names.
200 For example: VERT_RGBA is now VERT_BIT_COLOR0 and
201 VERT_SPEC_RGB is now VERT_BIT_COLOR1.
205 ----------------------------------------------------------------------
206 $Id: RELNOTES-4.1,v 1.12 2002/06/30 15:49:03 brianp Exp $