mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
synced 2024-12-14 04:34:23 +08:00
309 lines
10 KiB
Groff
309 lines
10 KiB
Groff
|
|
Mesa 4.1 release notes
|
|
|
|
October 29, 2002
|
|
|
|
PLEASE READ!!!!
|
|
|
|
|
|
|
|
Introduction
|
|
------------
|
|
|
|
Mesa uses an even/odd version number scheme like the Linux kernel.
|
|
Even numbered versions (such as 4.0) designate stable releases.
|
|
Odd numbered versions (such as 4.1) designate new developmental releases.
|
|
|
|
|
|
New Features in Mesa 4.1
|
|
------------------------
|
|
|
|
New extensions. Docs at http://oss.sgi.com/projects/ogl-sample/registry/
|
|
|
|
GL_NV_vertex_program
|
|
|
|
NVIDIA's vertex programming extension
|
|
|
|
GL_NV_vertex_program1_1
|
|
|
|
A few features built on top of GL_NV_vertex_program
|
|
|
|
GL_ARB_window_pos
|
|
|
|
This is the ARB-approved version of GL_MESA_window_pos
|
|
|
|
GL_ARB_depth_texture
|
|
|
|
This is the ARB-approved version of GL_SGIX_depth_texture.
|
|
It allows depth (Z buffer) data to be stored in textures.
|
|
This is used by GL_ARB_shadow
|
|
|
|
GL_ARB_shadow
|
|
|
|
Shadow mapping with depth textures.
|
|
This is the ARB-approved version of GL_SGIX_shadow.
|
|
|
|
GL_ARB_shadow_ambient
|
|
|
|
Allows one to specify the luminance of shadowed pixels.
|
|
This is the ARB-approved version of GL_SGIX_shadow_ambient.
|
|
|
|
GL_EXT_shadow_funcs
|
|
|
|
Extends the set of GL_ARB_shadow texture comparision functions to
|
|
include all eight of standard OpenGL dept-test functions.
|
|
|
|
GL_ARB_point_parameters
|
|
|
|
This is basically the same as GL_EXT_point_parameters.
|
|
|
|
GL_ARB_texture_env_crossbar
|
|
|
|
Allows any texture combine stage to reference any texture source unit.
|
|
|
|
GL_NV_point_sprite
|
|
|
|
For rendering points as textured quads. Useful for particle effects.
|
|
|
|
GL_NV_texture_rectangle (new in 4.0.4 actually)
|
|
|
|
Allows one to use textures with sizes that are not powers of two.
|
|
Note that mipmapping and several texture wrap modes are not allowed.
|
|
|
|
GL_EXT_multi_draw_arrays
|
|
|
|
Allows arrays of vertex arrays to be rendered with one call.
|
|
|
|
GL_EXT_stencil_two_side
|
|
|
|
Separate stencil modes for front and back-facing polygons.
|
|
|
|
GLX_SGIX_fbconfig & GLX_SGIX_pbuffer
|
|
|
|
Off-screen rendering support.
|
|
|
|
GL_ATI_texture_mirror_once
|
|
|
|
Adds two new texture wrap modes: GL_MIRROR_CLAMP_ATI and
|
|
GL_MIRROR_CLAMP_TO_EDGE_ATI.
|
|
|
|
|
|
|
|
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 1.3
|
|
OSMesa (off-screen) implements OpenGL 1.3
|
|
FX (3dfx Voodoo1/2) implements OpenGL 1.3
|
|
SVGA implements OpenGL 1.3
|
|
Wind River UGL implements OpenGL 1.3
|
|
Windows/Win32 implements OpenGL 1.3
|
|
DOS/DJGPP implements OpenGL 1.3
|
|
GGI implements OpenGL 1.3
|
|
BeOS needs updating (underway)
|
|
Allegro needs updating
|
|
D3D needs updating
|
|
DOS needs updating
|
|
|
|
|
|
|
|
New features in GLUT
|
|
--------------------
|
|
|
|
1. Frames per second printing
|
|
|
|
GLUT now looks for an environment variable called "GLUT_FPS". If it's
|
|
set, GLUT will print out a frames/second statistic to stderr when
|
|
glutSwapBuffers() is called. By default, frames/second is computed
|
|
and displayed once every 5 seconds. You can specify a different
|
|
interval (in milliseconds) when you set the env var. For example
|
|
'export GLUT_FPS=1000' or 'setenv GLUT_FPS 1000' will set the interval
|
|
to one second.
|
|
|
|
NOTE: the demo or application must call the glutInit() function for
|
|
this to work. Otherwise, the env var will be ignored.
|
|
|
|
Finally, this feature may not be reliable in multi-window programs.
|
|
|
|
|
|
2. glutGetProcAddress() function
|
|
|
|
The new function:
|
|
|
|
void *glutGetProcAddress(const char *procName)
|
|
|
|
is a wrapper for glXGetProcAddressARB() and wglGetProcAddress(). It
|
|
lets you dynamically get the address of an OpenGL function at runtime.
|
|
The GLUT_API_VERSION has been bumped to 5, but I haven't bumped the
|
|
GLUT version number from 3.7 since that's probably Mark Kilgard's role.
|
|
|
|
This function should probably also be able to return the address of
|
|
GLUT functions themselves, but it doesn't do that yet.
|
|
|
|
|
|
|
|
XXX Things To Do Yet XXXX
|
|
-------------------------
|
|
|
|
isosurf with vertex program exhibits some missing triangles (probably
|
|
when recycling the vertex buffer for long prims).
|
|
|
|
|
|
|
|
Porting Info
|
|
------------
|
|
|
|
If you're porting a DRI or other driver from Mesa 4.0.x to Mesa 4.1 here
|
|
are some things to change:
|
|
|
|
1. ctx->Texture._ReallyEnabled is obsolete.
|
|
|
|
Since there are now 5 texture targets (1D, 2D, 3D, cube and rect) that
|
|
left room for only 6 units (6*5 < 32) in this field.
|
|
This field is being replaced by ctx->Texture._EnabledUnits which has one
|
|
bit per texture unit. If the bit k of _EnabledUnits is set, that means
|
|
ctx->Texture.Unit[k]._ReallyEnabled is non-zero. You'll have to look at
|
|
ctx->Texture.Unit[k]._ReallyEnabled to learn if the 1D, 2D, 3D, cube or
|
|
rect texture is enabled for unit k.
|
|
|
|
This also means that the constants TEXTURE1_*, TEXTURE2_*, etc are
|
|
obsolete.
|
|
|
|
The tokens TEXTURE0_* have been replaced as well (since there's no
|
|
significance to the "0" part:
|
|
|
|
old token new token
|
|
TEXTURE0_1D TEXTURE_1D_BIT
|
|
TEXTURE0_2D TEXTURE_2D_BIT
|
|
TEXTURE0_3D TEXTURE_3D_BIT
|
|
TEXTURE0_CUBE TEXTURE_CUBE_BIT
|
|
<none> TEXTURE_RECT_BIT
|
|
|
|
These tokens are only used for the ctx->Texture.Unit[i].Enabled and
|
|
ctx->Texture.Unit[i]._ReallyEnabled fields. Exactly 0 or 1 bits will
|
|
be set in _ReallyEnabled at any time!
|
|
|
|
Q: "What's the purpose of Unit[i].Enabled vs Unit[i]._ReallyEnabled?"
|
|
A: The user can enable GL_TEXTURE_1D, GL_TEXTURE_2D, etc for any
|
|
texure unit all at once (an unusual thing to do).
|
|
OpenGL defines priorities that basically say GL_TEXTURE_2D has
|
|
higher priority than GL_TEXTURE_1D, etc. Also, just because a
|
|
texture target is enabled by the user doesn't mean we'll actually
|
|
use that texture! If a texture object is incomplete (missing mip-
|
|
map levels, etc) it's as if texturing is disabled for that target.
|
|
The _ReallyEnabled field will have a bit set ONLY if the texture
|
|
target is enabled and complete. This spares the driver writer from
|
|
examining a _lot_ of GL state to determine which texture target is
|
|
to be used.
|
|
|
|
|
|
2. Tnl tokens changes
|
|
|
|
During the implementation of GL_NV_vertex_program some of the vertex
|
|
buffer code was changed. Specifically, the VERT_* bits defined in
|
|
tnl/t_context.h have been renamed to better match the conventions of
|
|
GL_NV_vertex_program. The old names are still present but obsolete.
|
|
Drivers should use the newer names.
|
|
|
|
For example: VERT_RGBA is now VERT_BIT_COLOR0 and
|
|
VERT_SPEC_RGB is now VERT_BIT_COLOR1.
|
|
|
|
|
|
|
|
3. Read/Draw Buffer changes
|
|
|
|
The business of setting the current read/draw buffers in Mesa 4.0.x
|
|
was complicated. It's much simpler now in Mesa 4.1.
|
|
|
|
Here are the changes:
|
|
|
|
- Renamed ctx->Color.DrawDestMask to ctx->Color._DrawDestMask
|
|
- Removed ctx->Color.DriverDrawBuffer
|
|
- Removed ctx->Pixel.DriverReadBuffer
|
|
- Removed ctx->Color.MultiDrawBuffer
|
|
- Removed ctx->Driver.SetDrawBuffer()
|
|
- Removed swrast->Driver.SetReadBuffer().
|
|
- Added ctx->Color._DrawDestMask - a bitmask of FRONT/BACK_LEFT/RIGHT_BIT
|
|
values to indicate the current draw buffers.
|
|
- Added ctx->Pixel._ReadSrcMask to indicate the source for pixel reading.
|
|
The value is _one_ of the FRONT/BACK_LEFT/RIGHT_BIT values.
|
|
- Added ctx->Driver.DrawBuffer() and ctx->Driver.ReadBuffer().
|
|
These functions exactly correspond to glDrawBuffer and glReadBuffer calls.
|
|
Many drivers will set ctx->Driver.DrawBuffer = _swrast_DrawBuffer and
|
|
leave ctx->Draw.ReadBuffer NULL.
|
|
DRI drivers should implement their own function for ctx->Driver.DrawBuffer
|
|
and use it to set the current hardware drawing buffer. You'll probably
|
|
also want to check for GL_FRONT_AND_BACK mode and fall back to software.
|
|
Call _swrast_DrawBuffer() too, to update the swrast state.
|
|
- Added swrast->Driver.SetBuffer().
|
|
This function should be implemented by all device drivers that use swrast.
|
|
Mesa will call it to specify the buffer to use for span reading AND
|
|
writing and point/line/triangle rendering.
|
|
There should be no confusion between current read or draw buffer anymore.
|
|
- Added swrast->CurrentBuffer to indicate which color buffer to read/draw.
|
|
Will be FRONT_LEFT_BIT, BACK_LEFT_BIT, FRONT_RIGHT_BIT or BACK_RIGHT_BIT.
|
|
This value is usually passed to swrast->Driver.SetBuffer().
|
|
|
|
|
|
4. _mesa_create_context() changes. This function now takes a pointer to
|
|
a __GLimports object. The __GLimports structure contains function
|
|
pointers to system functions like fprintf(), malloc(), etc.
|
|
The _mesa_init_default_imports() function can be used to initialize
|
|
a __GLimports object. Most device drivers (like the DRI drivers)
|
|
should use this.
|
|
|
|
|
|
5. In tnl's struct vertex_buffer, the field "ProjectedClipCoords"
|
|
has been replaced by "NdcPtr" to better match the OpenGL spec's
|
|
terminology.
|
|
|
|
|
|
6. Since GL_EXT_stencil_two_side has been implemented, many of the
|
|
ctx->Stencil fields are now 2-element arrays. For example,
|
|
"GLenum Ref" is now "GLenum Ref[2]" The [0] elements are the front-face
|
|
values and the [1] elements are the back-face values.
|
|
ctx->Stencil.ActiveFace is 0 or 1 to indicate the current face for
|
|
the glStencilOp/Func/Mask() functions.
|
|
ctx->Stencil.TestTwoSide controls whether or not 1 or 2-sided stenciling
|
|
is enabled.
|
|
|
|
|
|
7. Removed ctx->Polygon._OffsetAny. Removed ctx->Polygon.OffsetMRD.
|
|
|
|
|
|
8. GLfloat / GLchan changes:
|
|
|
|
- Changed ctx->Driver.ClearColor() to take GLfloat[4] instead of GLchan[4].
|
|
ctx->Color.ClearColor is now GLfloat[4] too.
|
|
- Changed ctx->Driver.AlphaRef() to take GLfloat instead of GLchan.
|
|
- ctx->Color.AlphaRef is now GLfloat.
|
|
- texObj->BorderColor is now GLfloat[4]. texObj->_BorderChan is GLchan[4].
|
|
|
|
This is part of an effort to remove all GLchan types from core Mesa so
|
|
that someday we can support 8, 16 and 32-bit color channels dynamically
|
|
at runtime, instead of at compile-time.
|
|
|
|
|
|
9. GLboolean ctx->Tranform.ClipEnabled[MAX_CLIP_PLANES] has been replaced
|
|
by GLuint ctx->Transform.ClipPlanesEnabled. The later is a bitfield.
|
|
|
|
|
|
10. There's a new matrix_stack type in mtypes.h used for the Modelview,
|
|
Projection, Color and Texcoord matrix stacks.
|
|
|
|
|
|
11. The ctx->Current.* fields have changed a lot. Now, there's a
|
|
ctx->Current.Attrib[] array for all vertex attributes which matches
|
|
the NV vertex program conventions.
|
|
|
|
|
|
----------------------------------------------------------------------
|
|
$Id: RELNOTES-4.1,v 1.22 2002/10/29 15:06:37 brianp Exp $
|