228 lines
6.7 KiB
Groff
228 lines
6.7 KiB
Groff
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Mesa 3.5 release notes
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June 21, 2001
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PLEASE READ!!!!
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Introduction
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------------
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Mesa uses an even/odd version number scheme like the Linux kernel.
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Odd numbered versions (such as 3.5) designate new developmental releases.
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Even numbered versions (such as 3.4) designate stable releases.
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The biggest change in Mesa 3.5 is a complete overhaul of the source
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code in order to make it more modular. This was driven by the DRI
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hardware drivers. It simplifies the DRI drivers and opens the door
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to hardware transform/clip/lighting (TCL). Keith Whitwell can take
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the credit for that.
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Driver Support
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--------------
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The device driver interface in Mesa 3.5 has changed a lot since Mesa 3.4
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Not all of the older Mesa drivers have been updated. Here's the status:
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Driver Status
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---------------------- -----------
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XMesa (Xlib) updated
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OSMesa (off-screen) updated
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FX (3dfx Voodoo1/2) updated
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SVGA updated
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GGI not updated
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Windows/Win32 not updated
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DOS/DJGPP not updated
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BeOS not updated
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Allegro not updated
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D3D not updated
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DOS not updated
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We're looking for volunteers to update the remaining drivers. Please
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post to the Mesa3d-dev mailing list if you can help.
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GLU 1.3
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-------
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Mesa 3.5 includes the SGI Sample Implementation (SI) GLU library.
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This version of GLU supports the GLU 1.3 specification. The old
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Mesa GLU library implemented the 1.1 specification. The SI GLU
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library should work much better.
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You'll need a C++ compiler to compile the SI GLU library. This may
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be a problem on some systems.
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New Extensions
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--------------
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GL_EXT_convolution
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Adds image convolution to glRead/Copy/DrawPixels/TexImage.
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GL_ARB_imaging
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This is the optional imaging subset of OpenGL 1.2.
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It's the GL_EXT_convolution, GL_HP_convolution_border_modes,
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GL_EXT_histogram, GL_EXT_color_table, GL_EXT_color_subtable
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GL_EXT_blend_color, GL_EXT_blend_minmax, GL_EXT_blend_subtract
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and GL_SGI_color_matrix extensions all rolled together.
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This is supported in all software renderers but not in all
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hardware drivers (3dfx for example).
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GL_ARB_texture_compression
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This is supported in Mesa but only used by the 3dfx DRI drivers
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for Voodoo4 and later.
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GL_ARB_texture_env_add
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This is identical to GL_EXT_texture_env_add.
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GL_NV_blend_square
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Adds extra blend source and dest factors which allow squaring
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of color values.
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GL_EXT_fog_coord
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Allows specification of a per-vertex fog coordinate instead of
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having fog always computed from the eye distance.
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GL_EXT_secondary_color
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Allows specifying the secondary (specular) color for each vertex
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instead of getting it only from lighting in GL_SEPARATE_SPECULAR_COLOR
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mode.
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GL_ARB_texture_env_combine
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Basically the same as GL_EXT_texture_env_combine
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GL_ARB_texture_env_add extension
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Texture addition mode.
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GL_ARB_texture_env_dot3 extension
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Dot product texture environment.
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GL_ARB_texture_border_clamp
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Adds GL_CLAMP_TO_BORDER_ARB texture wrap mode
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GL_SGIX_depth_texture, GL_SGIX_shadow and GL_SGIX_shadow_ambient
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Implements a shadow casting algorithm based on depth map textures
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GL_SGIS_generate_mipmap
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Automatically generate lower mipmap images whenever the base mipmap
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image is changed with glTexImage, glCopyTexImage, etc.
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libOSMesa.so
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------------
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libOSMesa.so is a new library which contains the OSMesa interface for
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off-screen rendering. Apps which need the OSMesa interface should link
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with both -lOSMesa and -lGL. This change was made so that stand-alone
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Mesa works the same way as XFree86/DRI's libGL.
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Device Driver Changes / Core Mesa Changes
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-----------------------------------------
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The ctx->Driver.LogicOp() function has been removed. It used to
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be called during state update in order to determine if the driver
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could do glLogicOp() operations, and if not, set the SWLogicOpEnabled
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flag. Drivers should instead examine the LogicOp state themselves
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and choose specialized point, line, and triangle functions appropriately,
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or fall back to software rendering. The Xlib driver was the only driver
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to use this function. And since the Xlib driver no longer draws
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points, lines or triangles using Xlib, the LogicOp function isn't needed.
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The ctx->Driver.Dither() function has been removed. Drivers should
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detect dither enable/disable via ctx->Driver.Enable() instead.
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The ctx->Driver.IndexMask() and ctx->Driver.ColorMask() functions
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are now just called from glIndexMask and glColorMask like the other
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GL state-changing functions. They are no longer called from inside
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gl_update_state(). Also, they now return void. The change was made
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mostly for sake of uniformity.
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The NEW_DRVSTATE[0123] flags have been removed. They weren't being used
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and are obsolete w.r.t. the way state updates are done in DRI drivers.
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Removed obsolete gl_create_visual() and gl_destroy_visual().
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Renamed functions (new namespace):
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old new
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gl_create_framebuffer _mesa_create_framebuffer
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gl_destroy_framebuffer _mesa_destroy_framebuffer
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gl_create_context _mesa_create_context
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gl_destroy_context _mesa_destroy_context
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gl_context_initialize _mesa_context_initialize
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gl_copy_context _mesa_copy_context
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gl_make_current _mesa_make_current
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gl_make_current2 _mesa_make_current2
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gl_get_current_context _mesa_get_current_context
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gl_flush_vb _mesa_flush_vb
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gl_warning _mesa_warning
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gl_compile_error _mesa_compile_error
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All the drivers have been updated, but not all of them have been
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tested since I can't test some platforms (DOS, Windows, Allegro, etc).
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X/Mesa Driver
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-------------
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The source files for the X/Mesa driver in src/X have been renamed.
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The xmesa[1234].c files are gone. The new files are xm_api.c,
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xm_dd.c, xm_line.c, xm_span.c and xm_tri.c.
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Multitexture
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------------
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Eight texture units are now supported by default.
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OpenGL SI related changes
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-------------------------
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In an effort to make Mesa's internal interfaces more like the OpenGL
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SI interfaces, a number of changes have been made:
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1. Importing the SI's glcore.h file which defines a number of
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interface structures like __GLimports and __GLexports.
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2. Renamed "struct gl_context" to "struct __GLcontextRec".
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3. Added __glCoreCreateContext() and __glCoreNopDispatch() functions.
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4. The GLcontext member Visual is no longer a pointer.
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5. New file: imports.c to setup default import functions for Mesa.
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16-bit color channels
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---------------------
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There's experimental support for 16-bit color channels (64-bit pixels)
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in Mesa 3.5. Only the OSMesa interface can be used for 16-bit rendering.
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Type "make linux-osmesa16" in the top-level directory to build the
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special libOSMesa16.so library.
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This hasn't been tested very thoroughly yet so please file bug reports
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if you have trouble.
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In the future I hope to implement support for 32-bit, floating point
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color channels.
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----------------------------------------------------------------------
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