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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.
+
+
+
+----------------------------------------------------------------------
+$Id: RELNOTES-3.3,v 1.8 2000/07/21 16:26:41 brianp Exp $