diff options
Diffstat (limited to 'mesalib/src/mesa/swrast/NOTES')
-rw-r--r-- | mesalib/src/mesa/swrast/NOTES | 108 |
1 files changed, 54 insertions, 54 deletions
diff --git a/mesalib/src/mesa/swrast/NOTES b/mesalib/src/mesa/swrast/NOTES index d6f991ee8..ea373aa12 100644 --- a/mesalib/src/mesa/swrast/NOTES +++ b/mesalib/src/mesa/swrast/NOTES @@ -1,55 +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.
-
+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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