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Brian Paul 2003-09-17 03:33:54 +00:00
parent b04633d727
commit 278ce99171
1 changed files with 22 additions and 24 deletions
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46
src/mesa/swrast/s_context.h
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@ -36,30 +36,6 @@
#include "swrast.h" #include "swrast.h"
/**
* \struct sw_span
* \brief Contains data for either a horizontal line or a set of
* pixels that are passed through a pipeline of functions before being
* drawn.
*
* The sw_span structure describes the colors, Z, fogcoord, texcoords,
* etc for either a horizontal run or a set of independent pixels. We
* can either specify a base/step to indicate interpolated values, or
* fill in arrays of values. The interpMask and arrayMask bitfields
* indicate which are active.
*
* With this structure it's easy to hand-off span rasterization to
* subroutines instead of doing it all inline in the triangle functions
* like we used to do.
* It also cleans up the local variable namespace a great deal.
*
* It would be interesting to experiment with multiprocessor rasterization
* with this structure. The triangle rasterizer could simply emit a
* stream of these structures which would be consumed by one or more
* span-processing threads which could run in parallel.
*/
/** /**
* \defgroup SpanFlags SPAN_XXX-flags * \defgroup SpanFlags SPAN_XXX-flags
* Bitmasks to indicate which span_arrays need to be computed * Bitmasks to indicate which span_arrays need to be computed
@ -109,6 +85,28 @@ struct span_arrays {
}; };
/**
* \struct sw_span
* \brief Contains data for either a horizontal line or a set of
* pixels that are passed through a pipeline of functions before being
* drawn.
*
* The sw_span structure describes the colors, Z, fogcoord, texcoords,
* etc for either a horizontal run or an array of independent pixels.
* We can either specify a base/step to indicate interpolated values, or
* fill in arrays of values. The interpMask and arrayMask bitfields
* indicate which are active.
*
* With this structure it's easy to hand-off span rasterization to
* subroutines instead of doing it all inline in the triangle functions
* like we used to do.
* It also cleans up the local variable namespace a great deal.
*
* It would be interesting to experiment with multiprocessor rasterization
* with this structure. The triangle rasterizer could simply emit a
* stream of these structures which would be consumed by one or more
* span-processing threads which could run in parallel.
*/
struct sw_span { struct sw_span {
GLint x, y; GLint x, y;