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updated info about glRead/DrawBuffers()

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Brian Paul 2002-10-11 17:42:48 +00:00
parent 8ad1076dc2
commit f58826db57
1 changed files with 20 additions and 13 deletions
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33
docs/RELNOTES-4.1
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@ -219,25 +219,32 @@ are some things to change:
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
- Renamed ctx->Color.DrawDestMask to ctx->Color._DrawDestMask
- Removed ctx->Color.DriverDrawBuffer
- Removed 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.
- 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.
- Removed swrast->Driver.SetReadBuffer
- Added swrast->Driver.SetBuffer. This function should be implemented by
all device drivers that use swrast fallbacks (and the span functions).
Mesa will call this function 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->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
@ -293,4 +300,4 @@ are some things to change:
----------------------------------------------------------------------
$Id: RELNOTES-4.1,v 1.19 2002/10/10 23:49:02 brianp Exp $
$Id: RELNOTES-4.1,v 1.20 2002/10/11 17:42:48 brianp Exp $