Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 271 insertions, 0 deletions

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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 1.1.1.3 2004/08/12 23:43:27 anholt Exp $