sp_quad_stipple.c File Reference

Include dependency graph for sp_quad_stipple.c:

Go to the source code of this file.

Functions
static void	stipple_quad (struct quad_stage *qs, struct quad_header *quad)
	quad polygon stipple stage
static void	stipple_begin (struct quad_stage *qs)
static void	stipple_destroy (struct quad_stage *qs)
struct quad_stage *	sp_quad_polygon_stipple_stage (struct softpipe_context *softpipe)

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Function Documentation

struct quad_stage* sp_quad_polygon_stipple_stage

(

struct softpipe_context *

softpipe

)

[read]

Definition at line 83 of file sp_quad_stipple.c.

References quad_stage::begin, CALLOC_STRUCT, quad_stage::destroy, quad_stage::run, quad_stage::softpipe, stipple_begin(), stipple_destroy(), and stipple_quad().

{
   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);

   stage->softpipe = softpipe;
   stage->begin = stipple_begin;
   stage->run = stipple_quad;
   stage->destroy = stipple_destroy;

   return stage;

static void stipple_begin

(

struct quad_stage *

qs

)

[static]

Definition at line 70 of file sp_quad_stipple.c.

References quad_stage::begin, and quad_stage::next.

{
   qs->next->begin(qs->next);

static void stipple_destroy

(

struct quad_stage *

qs

)

[static]

Definition at line 76 of file sp_quad_stipple.c.

References FREE.

{
   FREE( qs );

static void stipple_quad	(	struct quad_stage *	qs,
		struct quad_header *	quad
	)			[static]

quad polygon stipple stage

Apply polygon stipple to quads produced by triangle rasterization

Definition at line 17 of file sp_quad_stipple.c.

References softpipe_context::framebuffer, pipe_framebuffer_state::height, quad_header::inout, quad_header::input, quad_header_inout::mask, MASK_BOTTOM_LEFT, MASK_BOTTOM_RIGHT, MASK_TOP_LEFT, MASK_TOP_RIGHT, quad_stage::next, pipe_rasterizer_state::origin_lower_left, softpipe_context::poly_stipple, quad_header_input::prim, PRIM_TRI, softpipe_context::rasterizer, quad_stage::run, quad_stage::softpipe, pipe_poly_stipple::stipple, quad_header_input::x0, and quad_header_input::y0.

{
   static const uint bit31 = 1 << 31;
   static const uint bit30 = 1 << 30;

   if (quad->input.prim == PRIM_TRI) {
      struct softpipe_context *softpipe = qs->softpipe;
      /* need to invert Y to index into OpenGL's stipple pattern */
      int y0, y1;
      uint stipple0, stipple1;
      if (softpipe->rasterizer->origin_lower_left) {
         y0 = softpipe->framebuffer.height - 1 - quad->input.y0;
         y1 = y0 - 1;
      }
      else {
         y0 = quad->input.y0;
         y1 = y0 + 1;
      }
      stipple0 = softpipe->poly_stipple.stipple[y0 % 32];
      stipple1 = softpipe->poly_stipple.stipple[y1 % 32];

#if 1
      {
      const int col0 = quad->input.x0 % 32;
      if ((stipple0 & (bit31 >> col0)) == 0)
         quad->inout.mask &= ~MASK_TOP_LEFT;

      if ((stipple0 & (bit30 >> col0)) == 0)
         quad->inout.mask &= ~MASK_TOP_RIGHT;

      if ((stipple1 & (bit31 >> col0)) == 0)
         quad->inout.mask &= ~MASK_BOTTOM_LEFT;

      if ((stipple1 & (bit30 >> col0)) == 0)
         quad->inout.mask &= ~MASK_BOTTOM_RIGHT;
      }
#else
      /* We'd like to use this code, but we'd need to redefine
       * MASK_TOP_LEFT to be (1 << 1) and MASK_TOP_RIGHT to be (1 << 0),
       * and similarly for the BOTTOM bits.  But that may have undesirable
       * side effects elsewhere.
       */
      const int col0 = 30 - (quad->input.x0 % 32);
      quad->inout.mask &= (((stipple0 >> col0) & 0x3) | 
                     (((stipple1 >> col0) & 0x3) << 2));
#endif
      if (!quad->inout.mask)
         return;
   }

   qs->next->run(qs->next, quad);

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