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227 lines
6.7 KiB
227 lines
6.7 KiB
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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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