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diff --git a/docs/RELNOTES-3.3 b/docs/RELNOTES-3.3 new file mode 100644 index 00000000000..28267402101 --- /dev/null +++ b/docs/RELNOTES-3.3 @@ -0,0 +1,200 @@ + + Mesa 3.3 release notes + + PLEASE READ!!!! + + + + +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. + + +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. + + + +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_EXT_transpose_matrix + Adds glLoadTransposeMatrix() and glMultTransposeMatrix() functions. + See http://reality.sgi.com/opengl/arb/extensions/ext_text/GL_EXT_transpose_matrix.txt + +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 + + + +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. + + + + +---------------------------------------------------------------------- +$Id: RELNOTES-3.3,v 1.1 2000/04/07 17:07:32 brianp Exp $ |