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authorEmil Velikov <[email protected]>2013-04-12 12:41:49 +0100
committerBrian Paul <[email protected]>2013-04-17 08:48:14 -0600
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tree41f22058fe4ec46284d8e646e6ca62b268249fdd /docs/RELNOTES-3.3
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docs: restructure release notes into separate folder
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-
- Mesa 3.3 release notes
-
- July 21, 2000
-
- PLEASE READ!!!!
-
-
-
-Introduction
-------------
-
-Mesa uses an even/odd version number scheme like the Linux kernel.
-Odd numbered versions (such as 3.3) designate new developmental releases.
-Even numbered versions (such as 3.2.1) designate stable releases.
-
-Mesa 3.3 has a undergone many internal changes since version 3.2
-and features a lot of new extensions. 3.3 is expected to be pretty
-stable, but perhaps not as stable as 3.2 which has been used by
-thousands of users over the past months.
-
-Everyone is encouraged to try Mesa 3.3. Bugs should be reported to
-the Mesa bug database on www.sourceforge.net.
-
-
-
-Header file / GLenum changes
-----------------------------
-
-The gl.h and glu.h headers now use #defines to define all GL_* tokens
-instead of C-language enums. This change improves Mesa/OpenGL
-interoperability.
-
-
-
-New API dispatch code
----------------------
-
-The core Mesa gl* functions are now implemented with a new dispatch
-(jump table) which will allow simultaneous direct/indirect rendering.
-
-The code is found in the glapi*.[ch] files.
-
-Of interest: the actual "glFooBar" functions are generated with
-templatized code defined in glapitemp.h and included by glapi.c
-The glapitemp.h template should be reusable for all sorts of OpenGL
-projects.
-
-The new dispatch code has also optimized with x86 assembly code.
-This optimization eliminates copying the function arguments during
-dispatch.
-
-
-
-New thread support
-------------------
-
-Thread support in Mesa has been rewritten. The glthread.[ch] files
-replace mthreads.[ch]. Thread safety is always enabled (on platforms
-which support threads, that is). There is virtually no performance
-penalty for typical single-thread applications. See the glapi.c
-file for details.
-
-The Xlib driver (XMesa) is now thread-safe as well. Be sure to
-call XInitThreads() in your app first. See the xdemos/glthreads.c
-demo for an example.
-
-
-
-Make configuration changes
---------------------------
-
-If you use the old-style (non GNU automake) method to build Mesa note
-that several of the configuration names have changed:
-
- Old name New name
- ------------- ----------------
- linux-elf linux
- linux linux-static
- linux-386-elf linux-386
- linux-386 linux-386-static
- etc.
-
-
-
-New extensions
---------------
-
-GL_ARB_transpose_matrix
- Adds glLoadTransposeMatrixARB() and glMultTransposeMatrixARB()
- functions.
-
-GL_ARB_texture_cube_map
- For cube-based reflection mapping.
-
-GL_EXT_texture_add_env
- Adds GL_ADD texture environment mode.
- See http://www.berkelium.com/OpenGL/EXT/texture_env_add.txt
-
-GL_EXT_texture_lod_bias
- Allows mipmapped texture blurring and sharpening.
-
-GLX_EXT_visual_rating extension
- This extension has no effect in stand-alone Mesa (used for DRI).
-
-GL_HP_occlusion_test
- Used for bounding box occlusion testing (see demos/occlude.c).
-
-GL_SGIX_pixel_texture / GL_SGIS_pixel_texture
- Lets glDraw/CopyPixels draw a texture coordinate image.
-
-GL_SGI_color_matrix
- Adds a color matrix and another set of scale and bias parameters
- to the glDraw/CopyPixels paths.
-
-GL_SGI_color_table
- Adds additional color tables to the glDraw/Read/CopyPixels paths.
-
-GL_EXT_histogram
- Compute histograms for glDraw/Read/CopyPixels.
-
-GL_EXT_blend_func_separate
- This is the same as GL_INGR_blend_func_separate.
-
-GL_ARB_texture_cube_mapping
- 6-face cube mapping, nicer than sphere mapping
-
-GL_EXT_texture_env_combine
- For advanced texture environment effects.
-
-
-Documentation for all these functions can be found at
-http://oss.sgi.com/projects/ogl-sample/registry/
-
-
-
-GLX_SGI_make_current_read functionality
----------------------------------------
-
-The functionality of this extension is needed for GLX 1.3 (and required
-for the Linux/OpenGL standards base).
-
-Implementing this function required a **DEVICE DRIVER CHANGE**.
-The old SetBuffer() function has been replaced by SetReadBuffer() and
-SetDrawBuffer(). All device drivers will have to be updated because
-of this change.
-
-The new function, glXMakeContextCurrent(), in GLX 1.3 now works in Mesa.
-The xdemos/wincopy.c program demonstrates it.
-
-
-
-Image-related code changes
---------------------------
-
-The imaging path code used by glDrawPixels, glTexImage[123]D,
-glTexSubImage[123], etc has been rewritten. It's now faster,
-uses less memory and has several bug fixes. This work was
-actually started in Mesa 3.1 with the glTexImage paths but has now
-been carried over to glDrawPixels as well.
-
-
-
-Device driver interface changes
--------------------------------
-
-Added new functions for hardware stencil buffer support:
- WriteStencilSpan
- ReadStencilSpan
- WriteStencilPixels
- ReadStencilPixels
-
-
-Removed old depth buffer functions:
- AllocDepthBuffer
- DepthTestSpan
- DepthTestPixels
- ReadDepthSpanFloat
- ReadDepthSpanInt
-
-
-Added new depth buffer functions:
- WriteDepthSpan
- ReadDepthSpan
- WriteDepthPixels
- ReadDepthPixels
-
- These functions always read/write 32-bit GLuints. This will allow
- drivers to have anywhere from 0 to 32-bit Z buffers without
- recompiling for 16 vs 32 bits as was previously needed.
-
-
-New texture image functions
- The entire interface for texture image specification has been updated.
- With the new functions, it's optional for Mesa to keep an internal copy
- of all textures. Texture download should be a lot faster when the extra
- copy isn't made.
-
-Misc changes
- TexEnv now takes a target argument
- Removed UseGlobalTexturePalette (use Enable function instead)
-
-
-Also added
- ReadPixels
- CopyPixels
-
-
-The SetBufffer function has been replaced by SetDrawBuffer and
-SetReadBuffer functions. This lets core Mesa independently
-specify which buffer is to be used for reading and which for
-drawing.
-
-The Clear function's mask parameter has changed. Instead of
-mask being the flags specified by the user to glClear, the
-mask is now a bitmask of the DD_*_BIT flags in dd.h. Now
-multiple color buffers can be specified for clearing (ala
-glDrawBuffers). The driver's Clear function must also
-check the glColorMask glIndexMask, and glStencilMask settings
-and do the right thing. See the X/Mesa, OS/Mesa, or FX/Mesa
-drivers for examples.
-
-
-The depth buffer changes shouldn't be hard to make for existing
-drivers. In fact, it should simply the code. Be careful with
-the depthBits value passed to gl_create_context(). 1 is a bad
-value! It should normally be 0, 16, 24, or 32.
-
-
-gl_create_framebuffer() takes new arguments which explicitly tell
-core Mesa which ancillary buffers (depth, stencil, accum, alpha)
-should be implemented in software. Mesa hardware drivers should
-carefully set these flags depending on which buffers are in the
-graphics card.
-
-
-
-Internal constants
-------------------
-
-Point and line size range and granularity limits are now stored
-in the gl_constants struct, which is the Const member of GLcontext.
-The limits are initialized from values in config.h but may be
-overridden by device drivers to reflect the limits of that driver's
-hardware.
-
-Also added constants for NumAuxBuffers and SubPixelBits.
-
-
-
-OpenGL Conformance
-------------------
-
-Mesa now passes all the OpenGL 1.1 conformance tests, except for
-antialiased lines. AA lines fail on some, but not all, the tests.
-In order to fix the remaining failures, a new AA line algorithm will
-be needed (which computes coverage values for end-point fragments).
-This will be done for Mesa 3.5/3.6.
-
-
-
-OpenGL 1.2 GL_ARB_imaging subset
---------------------------------
-
-Mesa 3.3 implements all the features of GL_ARB_imaging except for
-image convolution. This will (hopefully) be done for Mesa 3.5/3.6.
-
-
-
-----------------------------------------------------------------------