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gallium: add point_quad_rasterization bit to rasterizer state

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This determines if points should be rasterized according to GL point rules
or as normal quads (GL point sprites / d3d points / d3d point sprites).
This commit is contained in:
Roland Scheidegger
2010-02-04 21:35:28 +01:00
parent 2c326e7266
commit 68f93ea3eb
10 changed files with 22 additions and 6 deletions
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14
src/gallium/docs/source/cso/rasterizer.rst
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@@ -85,8 +85,10 @@ point_size
sprite_coord_enable
Specifies if a coord has its texture coordinates replaced or not. This
is a packed bitfield containing the enable for all coords - if all are 0
point sprites are effectively disabled. If any coord is non-zero,
point_smooth should be disabled.
point sprites are effectively disabled, though points may still be
rendered slightly different according to point_quad_rasterization.
If any coord is non-zero, point_smooth should be disabled, and
point_quad_rasterization enabled.
If enabled, the four vertices of the resulting quad will be assigned
texture coordinates, according to sprite_coord_mode.
sprite_coord_mode
@@ -103,6 +105,14 @@ sprite_coord_mode
Note that when geometry shaders are available, this state could be
removed. A special geometry shader defined by the state tracker could
convert the incoming points into quads with the proper texture coords.
point_quad_rasterization
This determines if points should be rasterized as quads or points.
d3d always uses quad rasterization for points, regardless if point sprites
are enabled or not, but OGL has different rules. If point_quad_rasterization
is set, point_smooth should be disabled, and points will be rendered as
squares even if multisample is enabled.
sprite_coord_enable should be zero if point_quad_rasterization is not
enabled.
scissor
Whether the scissor test is enabled.