Mesa 5.1 release notes December 17, 2003 PLEASE READ!!!! Introduction ------------ Mesa uses an even/odd version number scheme like the Linux kernel. Even-numbered versions (such as 5.0) designate stable releases. Odd-numbered versions (such as 5.1) designate new developmental releases. Bug fixes --------- See the VERSIONS file for a list of bugs fixed in this release. New Features in Mesa 5.1 ------------------------ GL_ARB_vertex_program / GL_ARB_fragment_program Michal Krol and Karl Rasche implemented these extensions. Thanks! Be aware that there may be some rough edges and lurking bugs. GL_ATI_texture_env_combine3 extension This adds a few new texture combine modes. Contributed by Ian Romanick. GL_SGI_texture_color_table Adds a color table lookup to the RGBA texture path. There's a separate color table for each texture unit. Contributed by Eric Plante. GL_NV_fragment_program NVIDIA's fragment-level programming feature. Possible lurking bugs: - the DDX and DDY commands aren't fully tested - there may be bugs in the parser - the TEX and TXP instructions both do perspective correction - the pack/unpack instructions may not be correct GL_EXT_depth_bounds_test This extension adds a scissor-like test for the Z axis. It's used to optimize stencil-volume shadow algorithms. GL_NV_light_max_exponent Lifts the 128 limit for max light exponent. GL_EXT_texture_rectangle Identical to GL_NV_texture_rectangle GL_ARB_occlusion_query Useful for visibility-based culling. GL_ARB_texture_non_power_of_two Removes the restriction that texture dimensions must be powers of two. GL_ARB_vertex_buffer_object Allows server-side vertex arrays, optimized host/card data transfers, etc. GL_ARB_point_sprite ARB-approved version of GL_NV_point_sprite. Basically allows textures to be applied to points. GL_IBM_multimode_draw_arrays Allows multiple vertex arrays to be drawn with one call, including arrays of different types of primitives. GL_SUN_multi_draw_arrays An alias for GL_EXT_multi_draw_arrays, standard in OpenGL 1.4. Faster glDrawPixels / glCopyPixels in X11 driver If your X screen is 32bpp, glDrawPixels to the front color buffer will be accelerated (via XPutImage()) if the image format is GL_BGRA and the type is GL_UNSIGNED_BYTE. No raster operations, such as depth test, blend, fog, etc. can be enabled. If your X screen is 16bpp, glDrawPixels to the front color buffer will be accelerated (via XPutImage()) if the image format is GL_RGB and the type is GL_UNSIGNED_SHORT_5_6_5. No raster operations, such as depth test, blend, fog, etc. can be enabled. glCopyPixels() calls for the front color buffer will be accelerated (via XCopyArea()) if no raster operations, such as depth test, blend, fog, pixel zoom, etc. are enabled. The speed-up over typical software rendering is a factor of 10 for glDrawPixels and 100 for glCopyPixels. With the addition of GL_ARB_occlusion_query, GL_ARB_vertex_buffer_object, GL_ARB_texture_non_power_of_two and GL_EXT_shadow_funcs, Mesa 5.1 supports all the new features of OpenGL 1.5. Mesa 6.0 (the next stable release) will advertise GL_VERSION = "1.5". Vertex/Fragment program debugger -------------------------------- GL_MESA_program_debug is an experimental extension to support interactive debugging of vertex and fragment programs. See the docs/MESA_program_debug.spec file for details. The bulk of the vertex/fragment program debugger is implemented outside of Mesa. The GL_MESA_program_debug extension just has minimal hooks for stopping running programs and inspecting programs. The progs/tests/debugger.c (only in CVS) program is an example of how the extension can be used. Presently, the debugger code and demo code is in the same file. Eventually the debugger code should be moved into a reusable module. As it is now, the demo lets you set breakpoings in vertex/fragment programs, single step, and print intermediate register values. It's basically just a proof of concept. Directory tree reorganization ----------------------------- The directory structure for Mesa has been overhauled to improve its layout. All source code for Mesa, GLU, GLUT, etc is now under the src/ directory in appropriate subdirectories. The Mesa source code and drivers has been reorganized under src/mesa/. All demonstration programs and tests are now in subdirectories under progs/. Build System Changes -------------------- The GNU automake/autoconf support has been removed. As it was, it seldom worked on anything but Linux. The Mesa developers aren't big fans of automake/autoconf/libtool and didn't have the time to maintain it. If someone wants to contribute new automake/autoconf support (and is willing to maintain it), it may be re-incorporated into Mesa, subject to some requirements. The "old style" makefile system has been updated: 1. Make-config has been trimmed down to fewer, modern configurations. 2. Most of the bin/mklib.* scripts have been rolled into a new "mklib" script that works on all sorts of systems. There are probably some bugs in it, but it's been tested on Linux, SunOS 5.8 and IRIX 6.5. Improvements/contributes are greatly appreciated. 3. The Makefile.X11 files have been cleaned up in various ways Source File Changes ------------------- The mmath.[ch] files are obsolete. Their contents have been moved into the imports.[ch] and macros.[ch] files. The files related to vertex and fragment programming have changed. Old files: vpexec.[ch] vpparse.[ch] vpstate.[ch] New files: program.[ch] - generic ARB/NV program code arbprogram.[ch] - ARB program API functions arbfragparse.[ch] - ARB fragment program parsing arbvertparse.[ch] - ARB vertex program parsing arbparse.[ch] - ARB vertex/fragment parsing arbparse_syn.h - vertex/fragment program syntax nvprogram.[ch] - NV program API functions nvvertprog.h - NV vertex program definitions nvfragprog.h - NV fragment program definitions nvvertparse.[ch] - NV vertex program parser nvfragparse.[ch] - NV fragment program parser nvvertexec.[ch] - NV vertex program execution swrast/s_nvfragprog.[ch] - NV fragment program execution The files related to per-vertex handling have changed. Old files: tnl/t_eval_api.c - old per-vertex code tnl/t_imm_alloc.c - old per-vertex code tnl/t_imm_api.c - old per-vertex code tnl/t_imm_debug.c - old per-vertex code tnl/t_imm_dlist.c - old per-vertex code tnl/t_imm_elt.c - old per-vertex code tnl/t_imm_eval.c - old per-vertex code tnl/t_imm_exec.c - old per-vertex code tnl/t_imm_fixup.c - old per-vertex code tnl/t_vtx_sse.c - old per-vertex code tnl/t_vtx_x86.c - old per-vertex code New files: tnl/t_save_api.c - new per-vertex code tnl/t_save_loopback.c - new per-vertex code tnl/t_save_playback.c - new per-vertex code tnl/t_vtx_eval.c - old per-vertex code Other new files: bufferobj.[ch] - GL_ARB_vertex_buffer_object functions version.h - defines the Mesa version info Other removed files: swrast/s_histogram.[ch] - moved into src/histogram.c Other Changes ------------- The ctx->Driver.CreateTexture function has been removed - it wasn't used. New device driver hook functions: NewTextureObject - used to allocate struct gl_texture_objects NewTextureImage - used to allocate struct gl_texture_images New ctx->Texture._EnabledCoordUnits field: With the addition of GL_NV_fragment_program we may need to interpolate various sets of texture coordinates even when the corresponding texture unit is not enabled. That is, glEnable(GL_TEXTURE_xD) may never get called but we still may have to interpolate texture coordinates across triangles so that the fragment program will get them. This new field indicates which sets of texture coordinates are needed. If a bit is set in the ctx->Texture._EnabledUnits bitmask is set, the same bit MUST be set in ctx->Texture._EnabledCoordUnits. The ctx->_TriangleCaps field is deprecated. Instead of testing the DD_* bits in _TriangleCaps, you should instead directly test the relevant state variables, or use one of the helper functions like NEED_SECONDARY_COLOR() at the bottom of context.h While testing _TriangleCaps bits was fast, it was kludgey, and setting the bits in the first place could be error prone. New vertex processing code. The code behind glBegin, glEnd, glVertex, glNormal, etc. has been totally rewritten. It's a cleaner implementation now and should use less memory. (Keith) To Do ----- Add screen-awareness to fakeglx.c Device Driver Status -------------------- A number of Mesa's software drivers haven't been actively maintained for some time. We rely on volunteers to maintain many of these drivers. Here's the current status of all included drivers: Driver Status ---------------------- --------------------- XMesa (Xlib) implements OpenGL 1.4 OSMesa (off-screen) implements OpenGL 1.4 FX (3dfx Voodoo1/2) implements OpenGL 1.3 SVGA implements OpenGL 1.3 Wind River UGL implements OpenGL 1.3 Windows/Win32 implements OpenGL 1.4 DJGPP implements OpenGL 1.4 GGI implements OpenGL 1.3 BeOS implements OpenGL 1.4 Allegro needs updating D3D needs updating Note: supporting OpenGL 1.4 (vs. 1.3 or 1.2) usually only requires that the driver call the _mesa_enable_1_4_extensions() function. ----------------------------------------------------------------------