src/gallium/docs/source/cso/rasterizer.rst

   1 .. _rasterizer:
   2
   3 Rasterizer
   4 ==========
   5
   6 The rasterizer is the main chunk of state controlling how vertices are
   7 interpolated into fragments.
   8
   9 Members
  10 -------
  11
  12 XXX undocumented light_twoside, front_winding, cull_mode, fill_cw, fill_ccw, offset_cw, offset_ccw
  13 XXX moar undocumented poly_smooth, line_stipple_factor, line_last_pixel, offset_units, offset_scale
  14 XXX sprite_coord_mode
  15
  16 flatshade
  17     If set, the provoking vertex of each polygon is used to determine the
  18     color of the entire polygon. If not set, the color fragments will be
  19     interpolated from each vertex's color.
  20 scissor
  21     Whether the scissor test is enabled.
  22 poly_stipple_enable
  23     Whether polygon stippling is enabled.
  24 point_smooth
  25     Whether points should be smoothed. Point smoothing turns rectangular
  26     points into circles or ovals.
  27 point_sprite
  28     Whether point sprites are enabled.
  29 point_size_per_vertex
  30     Whether vertices have a point size element.
  31 multisample
  32     Whether MSAA is enabled.
  33 line_smooth
  34     Whether lines should be smoothed. Line smoothing is simply anti-aliasing.
  35 line_stipple_enable
  36     Whether line stippling is enabled.
  37 line_stipple_pattern
  38     16-bit bitfield of on/off flags, used to pattern the line stipple.
  39 bypass_vs_clip_and_viewport
  40     Whether the entire TCL pipeline should be bypassed. This implies that
  41     vertices are pre-transformed for the viewport, and will not be run
  42     through the vertex shader. Note that implementations may still clip away
  43     vertices that are not in the viewport.
  44 flatshade_first
  45     Whether the first vertex should be the provoking vertex, for most
  46     primitives. If not set, the last vertex is the provoking vertex.
  47 gl_rasterization_rules
  48     Whether the rasterizer should use (0.5, 0.5) pixel centers. When not set,
  49     the rasterizer will use (0, 0) for pixel centers.
  50 line_width
  51     The width of lines.
  52 point_size
  53     The size of points, if not specified per-vertex.
  54 point_size_min
  55     The minimum size of points.
  56 point_size_max
  57     The maximum size of points.
  58
  59 Notes
  60 -----
  61
  62 flatshade
  63 ^^^^^^^^^
  64
  65 The actual interpolated shading algorithm is obviously
  66 implementation-dependent, but will usually be Gourard for most hardware.
  67
  68 bypass_vs_clip_and_viewport
  69 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  70
  71 When set, this implies that vertices are pre-transformed for the viewport, and
  72 will not be run through the vertex shader. Note that implementations may still
  73 clip away vertices that are not visible.
  74
  75 flatshade_first
  76 ^^^^^^^^^^^^^^^
  77
  78 There are several important exceptions to the specification of this rule.
  79
  80 * PIPE_PRIMITIVE_POLYGON: The provoking vertex is always the first vertex.
  81   If the caller wishes to change the provoking vertex, they merely need to
  82   rotate the vertices themselves.
  83 * PIPE_PRIMITIVE_QUAD, PIPE_PRIMITIVE_QUAD_STRIP: This option has no effect.
  84 * PIPE_PRIMITIVE_TRIANGLE_FAN: When set, the provoking vertex is the second
  85   vertex, not the first. This permits each segment of the fan to have a
  86   different color.