gallium: better docs for pipe_rasterizer_state::sprite_coord_enable
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@ -124,17 +124,24 @@ Points
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sprite_coord_enable
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^^^^^^^^^^^^^^^^^^^
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Specifies if a texture unit has its texture coordinates replaced or not. This
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is a packed bitfield containing the enable for all texcoords -- if all bits
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are zero, point sprites are effectively disabled.
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Controls automatic texture coordinate generation for rendering sprite points.
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When bit k in the sprite_coord_enable bitfield is set, then generic
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input k to the fragment shader will get an automatically computed
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texture coordinate.
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The texture coordinate will be of the form (s, t, 0, 1) where s varies
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from 0 to 1 from left to right while t varies from 0 to 1 according to
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the state of 'sprite_coord_mode' (see below).
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If any bit is set, then point_smooth MUST be disabled (there are no
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round sprites) and point_quad_rasterization MUST be true (sprites are
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always rasterized as quads). Any mismatch between these states should
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be considered a bug in the state-tracker.
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If enabled, the four vertices of the resulting quad will be assigned
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texture coordinates, according to sprite_coord_mode.
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This feature is implemented in the :ref:`Draw` module but may also be
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implemented natively by GPUs or implemented with a geometry shader.
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sprite_coord_mode
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^^^^^^^^^^^^^^^^^
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@ -145,6 +152,7 @@ have coordinates (0,0,0,1). For PIPE_SPRITE_COORD_UPPER_LEFT, the upper-left
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vertex will have coordinates (0,0,0,1).
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This state is used by :ref:`Draw` to generate texcoords.
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point_quad_rasterization
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^^^^^^^^^^^^^^^^^^^^^^^^
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