diff options
| author | Brian Paul <brian.paul@tungstengraphics.com> | 2002-07-09 01:28:03 +0000 |
|---|---|---|
| committer | Brian Paul <brian.paul@tungstengraphics.com> | 2002-07-09 01:28:03 +0000 |
| commit | 55c82c596e1c1e597da183942db002d3d0b8f29f (patch) | |
| tree | 0c33faa25fb21454932852feedc0dbc748bf2b96 /docs | |
| parent | 3b4fbbc129c711a5aec8d653d5c6eb2e195f947c (diff) | |
added Read/DrawBuffer porting info
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/RELNOTES-4.1 | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/docs/RELNOTES-4.1 b/docs/RELNOTES-4.1 index 3a2178f4a4..ab95ea1950 100644 --- a/docs/RELNOTES-4.1 +++ b/docs/RELNOTES-4.1 @@ -172,7 +172,7 @@ are some things to change: <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 bit will + 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?" @@ -202,5 +202,34 @@ are some things to change: +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: + + - Rename ctx->Color.DrawDestMask to ctx->Color._DrawDestMask + - Rename ctx->Color.DriverDrawBuffer to ctx->Color._DriverDrawBuffer + - Rename ctx->Pixel.DriverReadBuffer to ctx->Pixel._DriverReadBuffer + - Removed ctx->Color.MultiDrawBuffer + - Removed ctx->Driver.SetDrawBuffer + - 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. + - Removed swrast->Driver.SetReadBuffer + - Added swrast->Driver.SetBuffer. This function should be implemented by + _all_ device drivers. 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. + + + + ---------------------------------------------------------------------- -$Id: RELNOTES-4.1,v 1.12 2002/06/30 15:49:03 brianp Exp $ +$Id: RELNOTES-4.1,v 1.13 2002/07/09 01:28:03 brianp Exp $ |