diff options
Diffstat (limited to 'mesalib/src/mesa/swrast_setup/NOTES')
-rw-r--r-- | mesalib/src/mesa/swrast_setup/NOTES | 130 |
1 files changed, 65 insertions, 65 deletions
diff --git a/mesalib/src/mesa/swrast_setup/NOTES b/mesalib/src/mesa/swrast_setup/NOTES index b5d2c503e..bdf57c39e 100644 --- a/mesalib/src/mesa/swrast_setup/NOTES +++ b/mesalib/src/mesa/swrast_setup/NOTES @@ -1,65 +1,65 @@ -INTRODUCTION
-
-A helper module which provides glue to bind the software rasterizer to
-the software t&l module. The main task of this module is to build
-swrast vertices from the t&l vertex_buffer structs, and to use them to
-perform triangle setup functions not implemented in the software
-rasterizer.
-
-The module implements a full set of functions to plug into the
-t_vb_render.c driver interface (tnl->Driver.Render.*).
-
-There are strong advantages to decoupling the software rasterizer from
-the t&l module, primarily allowing hardware drivers better control
-over fallbacks, the removal of implicit knowledge about the software
-rasterizer in the t&l module, allowing the two modules to evolve
-independently and allowing either to be substituted with equivalent
-functionality from another codebase.
-
-This module implements triangle/quad setup for offset, unfilled and
-twoside-lit triangles. The software rasterizer doesn't handle these
-primitives directly.
-
-Hardware rasterization drivers typically use this module in situations
-where no hardware rasterization is possible, ie during total
-fallbacks.
-
-STATE
-
-To create and destroy the module:
-
- GLboolean _swsetup_CreateContext( struct gl_context *ctx );
- void _swsetup_DestroyContext( struct gl_context *ctx );
-
-The module is not active by default, and must be installed by calling
-_swrast_Wakeup(). This function installs internal swrast_setup
-functions into all the tnl->Driver.Render driver hooks, thus taking
-over the task of rasterization entirely:
-
- void _swrast_Wakeup( 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 _swsetup_InvalidateState( struct gl_context *ctx, GLuint new_state );
-
-There is no explicit call to put the swsetup module to sleep. Simply
-install other function pointers into all the tnl->Driver.Render.*
-hooks, and (optionally) cease calling _swsetup_InvalidateState().
-
-DRIVER INTERFACE
-
-The module offers a minimal driver interface:
-
- void (*Start)( struct gl_context *ctx );
- void (*Finish)( struct gl_context *ctx );
-
-These are called before and after the completion of all swrast drawing
-activity. As swrast doesn't call callbacks during triangle, line or
-point rasterization, these are necessary to provide locking hooks for
-some drivers. They may otherwise be left null.
-
-
+INTRODUCTION + +A helper module which provides glue to bind the software rasterizer to +the software t&l module. The main task of this module is to build +swrast vertices from the t&l vertex_buffer structs, and to use them to +perform triangle setup functions not implemented in the software +rasterizer. + +The module implements a full set of functions to plug into the +t_vb_render.c driver interface (tnl->Driver.Render.*). + +There are strong advantages to decoupling the software rasterizer from +the t&l module, primarily allowing hardware drivers better control +over fallbacks, the removal of implicit knowledge about the software +rasterizer in the t&l module, allowing the two modules to evolve +independently and allowing either to be substituted with equivalent +functionality from another codebase. + +This module implements triangle/quad setup for offset, unfilled and +twoside-lit triangles. The software rasterizer doesn't handle these +primitives directly. + +Hardware rasterization drivers typically use this module in situations +where no hardware rasterization is possible, ie during total +fallbacks. + +STATE + +To create and destroy the module: + + GLboolean _swsetup_CreateContext( struct gl_context *ctx ); + void _swsetup_DestroyContext( struct gl_context *ctx ); + +The module is not active by default, and must be installed by calling +_swrast_Wakeup(). This function installs internal swrast_setup +functions into all the tnl->Driver.Render driver hooks, thus taking +over the task of rasterization entirely: + + void _swrast_Wakeup( 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 _swsetup_InvalidateState( struct gl_context *ctx, GLuint new_state ); + +There is no explicit call to put the swsetup module to sleep. Simply +install other function pointers into all the tnl->Driver.Render.* +hooks, and (optionally) cease calling _swsetup_InvalidateState(). + +DRIVER INTERFACE + +The module offers a minimal driver interface: + + void (*Start)( struct gl_context *ctx ); + void (*Finish)( struct gl_context *ctx ); + +These are called before and after the completion of all swrast drawing +activity. As swrast doesn't call callbacks during triangle, line or +point rasterization, these are necessary to provide locking hooks for +some drivers. They may otherwise be left null. + + |