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| author | marha <marha@users.sourceforge.net> | 2010-12-28 16:10:20 +0000 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2010-12-28 16:10:20 +0000 |
| commit | 807c6931fe683fd844ceec1b023232181e6aae03 (patch) | |
| tree | 1a131ed95fe2200d0ad33da8f7755a7ed2364adc /mesalib/src/mesa/swrast/NOTES | |
| parent | 973099dda7e49e5abe29819a7124b3b1e7bd8b92 (diff) | |
| download | vcxsrv-807c6931fe683fd844ceec1b023232181e6aae03.tar.gz vcxsrv-807c6931fe683fd844ceec1b023232181e6aae03.tar.bz2 vcxsrv-807c6931fe683fd844ceec1b023232181e6aae03.zip | |
xserver and mesa git update 28-12-2010
Diffstat (limited to 'mesalib/src/mesa/swrast/NOTES')
| -rw-r--r-- | mesalib/src/mesa/swrast/NOTES | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/NOTES b/mesalib/src/mesa/swrast/NOTES new file mode 100644 index 000000000..d6f991ee8 --- /dev/null +++ b/mesalib/src/mesa/swrast/NOTES @@ -0,0 +1,55 @@ +INTRODUCTION
+
+Mesa's native software rasterizer. This module provides the fallback
+paths for rasterization operations and states that aren't accelerated
+in hardware drivers, and as the full rasterization engine in software
+drivers.
+
+The swrast module 'stands alone', relying only on interfaces to core
+mesa and it's own driver interface. It knows nothing about the tnl or
+other modules, allowing it to be used for fallback paths in future tnl
+schemes without modification.
+
+As well as providing triangle/line/point rasterization functionality,
+the module provides implementations of the pixel operations
+(ReadPixels, etc), and texture operations (CopyTexSubImage) which may
+be plugged in to the core Mesa driver interface where accelerated
+versions of these operations are unavailable.
+
+
+STATE
+
+To create and destroy the module:
+
+ GLboolean _swrast_CreateContext( struct gl_context *ctx );
+ void _swrast_DestroyContext( struct gl_context *ctx );
+
+This module tracks state changes internally and maintains derived
+values based on the current state. For this to work, the driver
+ensure the following funciton is called whenever the state changes and
+the swsetup module is 'awake':
+
+ void _swrast_InvalidateState( struct gl_context *ctx, GLuint new_state );
+
+There is no explicit call to put the swrast module to sleep.
+
+
+CUSTOMIZATION
+
+ void (*choose_point)( struct gl_context * );
+ void (*choose_line)( struct gl_context * );
+ void (*choose_triangle)( struct gl_context * );
+
+Drivers may add additional triangle/line/point functions to swrast by
+overriding these functions. It is necessary for the driver to be very
+careful that it doesn't return an inappropriate function, eg a
+rasterization function in feedback mode. See the X11 driver for
+examples.
+
+DRIVER INTERFACE
+
+The swrast device driver provides swrast primarily with span- and
+pixel- level interfaces to a framebuffer, with a few additional hooks
+for locking and setting the read buffer.
+
+See the definition of struct swrast_device_driver in swrast.h.
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