1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 /* Authors: Keith Whitwell <keith@tungstengraphics.com>
34 #include "sp_context.h"
35 #include "sp_headers.h"
36 #include "pipe/draw/draw_private.h"
38 #include "sp_prim_setup.h"
44 * This passes the quad to the first stage of per-fragment operations.
47 quad_emit(struct softpipe_context
*sp
, struct quad_header
*quad
)
49 sp
->quad
.first
->run(sp
->quad
.first
, quad
);
57 GLfloat dx
; /* X(v1) - X(v0), used only during setup */
58 GLfloat dy
; /* Y(v1) - Y(v0), used only during setup */
59 GLfloat dxdy
; /* dx/dy */
60 GLfloat sx
; /* first sample point x coord */
62 GLint lines
; /* number of lines on this edge */
67 * Triangle setup info (derived from prim_stage).
68 * Also used for line drawing (taking some liberties).
71 struct prim_stage stage
; /**< This must be first (base class) */
74 struct softpipe_context
*softpipe
;
76 /* Vertices are just an array of floats making up each attribute in
77 * turn. Currently fixed at 4 floats, but should change in time.
78 * Codegen will help cope with this.
80 const struct vertex_header
*vmax
;
81 const struct vertex_header
*vmid
;
82 const struct vertex_header
*vmin
;
83 const struct vertex_header
*vprovoke
;
91 struct setup_coefficient coef
[FRAG_ATTRIB_MAX
];
92 struct quad_header quad
;
95 GLint left
[2]; /**< [0] = row0, [1] = row1 */
99 GLuint mask
; /**< mask of MASK_BOTTOM/TOP_LEFT/RIGHT bits */
106 * Basically a cast wrapper.
108 static inline struct setup_stage
*setup_stage( struct prim_stage
*stage
)
110 return (struct setup_stage
*)stage
;
115 * Given an X or Y coordinate, return the block/quad coordinate that it
118 static inline GLint
block( GLint x
)
125 static void setup_begin( struct prim_stage
*stage
)
127 struct setup_stage
*setup
= setup_stage(stage
);
129 setup
->quad
.nr_attrs
= setup
->softpipe
->nr_frag_attrs
;
134 * Run shader on a quad/block.
136 static void run_shader_block( struct setup_stage
*setup
,
137 GLint x
, GLint y
, GLuint mask
)
141 setup
->quad
.mask
= mask
;
143 quad_emit(setup
->softpipe
, &setup
->quad
);
148 * Compute mask which indicates which pixels in the 2x2 quad are actually inside
149 * the triangle's bounds.
151 * this is pretty nasty... may need to rework flush_spans again to
152 * fix it, if possible.
154 static GLuint
calculate_mask( struct setup_stage
*setup
,
159 if (x
>= setup
->span
.left
[0] && x
< setup
->span
.right
[0])
160 mask
|= MASK_BOTTOM_LEFT
;
162 if (x
>= setup
->span
.left
[1] && x
< setup
->span
.right
[1])
163 mask
|= MASK_TOP_LEFT
;
165 if (x
+1 >= setup
->span
.left
[0] && x
+1 < setup
->span
.right
[0])
166 mask
|= MASK_BOTTOM_RIGHT
;
168 if (x
+1 >= setup
->span
.left
[1] && x
+1 < setup
->span
.right
[1])
169 mask
|= MASK_TOP_RIGHT
;
176 * Render a horizontal span of quads
178 static void flush_spans( struct setup_stage
*setup
)
180 GLint minleft
, maxright
;
183 switch (setup
->span
.y_flags
) {
185 minleft
= MIN2(setup
->span
.left
[0], setup
->span
.left
[1]);
186 maxright
= MAX2(setup
->span
.right
[0], setup
->span
.right
[1]);
190 minleft
= setup
->span
.left
[0];
191 maxright
= setup
->span
.right
[0];
195 minleft
= setup
->span
.left
[1];
196 maxright
= setup
->span
.right
[1];
204 for (x
= block(minleft
); x
<= block(maxright
); )
206 run_shader_block( setup
, x
,
208 calculate_mask( setup
, x
) );
213 setup
->span
.y_flags
= 0;
214 setup
->span
.right
[0] = 0;
215 setup
->span
.right
[1] = 0;
219 static GLboolean
setup_sort_vertices( struct setup_stage
*setup
,
220 const struct prim_header
*prim
)
222 const struct vertex_header
*v0
= prim
->v
[0];
223 const struct vertex_header
*v1
= prim
->v
[1];
224 const struct vertex_header
*v2
= prim
->v
[2];
226 setup
->vprovoke
= v2
;
228 /* determine bottom to top order of vertices */
230 GLfloat y0
= v0
->data
[0][1];
231 GLfloat y1
= v1
->data
[0][1];
232 GLfloat y2
= v2
->data
[0][1];
275 setup
->ebot
.dx
= setup
->vmid
->data
[0][0] - setup
->vmin
->data
[0][0];
276 setup
->ebot
.dy
= setup
->vmid
->data
[0][1] - setup
->vmin
->data
[0][1];
277 setup
->emaj
.dx
= setup
->vmax
->data
[0][0] - setup
->vmin
->data
[0][0];
278 setup
->emaj
.dy
= setup
->vmax
->data
[0][1] - setup
->vmin
->data
[0][1];
279 setup
->etop
.dx
= setup
->vmax
->data
[0][0] - setup
->vmid
->data
[0][0];
280 setup
->etop
.dy
= setup
->vmax
->data
[0][1] - setup
->vmid
->data
[0][1];
282 /* xxx: may need to adjust this sign according to the if-tree
285 * XXX: this is like 'det', but calculated from screen coords??
288 const GLfloat area
= (setup
->emaj
.dx
* setup
->ebot
.dy
-
289 setup
->ebot
.dx
* setup
->emaj
.dy
);
291 setup
->oneoverarea
= 1.0 / area
;
294 /* XXX need to know if this is a front or back-facing triangle:
295 * - the GLSL gl_FrontFacing fragment attribute (bool)
296 * - two-sided stencil test
298 setup
->quad
.facing
= 0;
300 _mesa_printf("%s one-over-area %f\n", __FUNCTION__
, setup
->oneoverarea
);
308 * Compute a0 for a constant-valued coefficient (GL_FLAT shading).
310 static void const_coeff( struct setup_stage
*setup
,
314 setup
->coef
[slot
].dadx
[i
] = 0;
315 setup
->coef
[slot
].dady
[i
] = 0;
317 /* need provoking vertex info!
319 setup
->coef
[slot
].a0
[i
] = setup
->vprovoke
->data
[slot
][i
];
324 * Compute a0, dadx and dady for a linearly interpolated coefficient,
327 static void tri_linear_coeff( struct setup_stage
*setup
,
331 GLfloat botda
= setup
->vmid
->data
[slot
][i
] - setup
->vmin
->data
[slot
][i
];
332 GLfloat majda
= setup
->vmax
->data
[slot
][i
] - setup
->vmin
->data
[slot
][i
];
333 GLfloat a
= setup
->ebot
.dy
* majda
- botda
* setup
->emaj
.dy
;
334 GLfloat b
= setup
->emaj
.dx
* botda
- majda
* setup
->ebot
.dx
;
336 setup
->coef
[slot
].dadx
[i
] = a
* setup
->oneoverarea
;
337 setup
->coef
[slot
].dady
[i
] = b
* setup
->oneoverarea
;
339 /* calculate a0 as the value which would be sampled for the
340 * fragment at (0,0), taking into account that we want to sample at
341 * pixel centers, in other words (0.5, 0.5).
343 * this is neat but unfortunately not a good way to do things for
344 * triangles with very large values of dadx or dady as it will
345 * result in the subtraction and re-addition from a0 of a very
346 * large number, which means we'll end up loosing a lot of the
347 * fractional bits and precision from a0. the way to fix this is
348 * to define a0 as the sample at a pixel center somewhere near vmin
349 * instead - i'll switch to this later.
351 setup
->coef
[slot
].a0
[i
] = (setup
->vmin
->data
[slot
][i
] -
352 (setup
->coef
[slot
].dadx
[i
] * (setup
->vmin
->data
[0][0] - 0.5) +
353 setup
->coef
[slot
].dady
[i
] * (setup
->vmin
->data
[0][1] - 0.5)));
355 _mesa_printf("attr[%d].%c: %f dx:%f dy:%f\n",
357 setup
->coef
[slot
].a0
[i
],
358 setup
->coef
[slot
].dadx
[i
],
359 setup
->coef
[slot
].dady
[i
]);
364 * Compute a0, dadx and dady for a perspective-corrected interpolant,
367 static void tri_persp_coeff( struct setup_stage
*setup
,
371 /* premultiply by 1/w:
373 GLfloat mina
= setup
->vmin
->data
[slot
][i
] * setup
->vmin
->data
[0][3];
374 GLfloat mida
= setup
->vmid
->data
[slot
][i
] * setup
->vmid
->data
[0][3];
375 GLfloat maxa
= setup
->vmax
->data
[slot
][i
] * setup
->vmax
->data
[0][3];
377 GLfloat botda
= mida
- mina
;
378 GLfloat majda
= maxa
- mina
;
379 GLfloat a
= setup
->ebot
.dy
* majda
- botda
* setup
->emaj
.dy
;
380 GLfloat b
= setup
->emaj
.dx
* botda
- majda
* setup
->ebot
.dx
;
382 setup
->coef
[slot
].dadx
[i
] = a
* setup
->oneoverarea
;
383 setup
->coef
[slot
].dady
[i
] = b
* setup
->oneoverarea
;
384 setup
->coef
[slot
].a0
[i
] = (mina
-
385 (setup
->coef
[slot
].dadx
[i
] * (setup
->vmin
->data
[0][0] - 0.5) +
386 setup
->coef
[slot
].dady
[i
] * (setup
->vmin
->data
[0][1] - 0.5)));
392 * Compute the setup->coef[] array dadx, dady, a0 values.
393 * Must be called after setup->vmin,vmid,vmax,vprovoke are initialized.
395 static void setup_tri_coefficients( struct setup_stage
*setup
)
397 const enum interp_mode
*interp
= setup
->softpipe
->interp
;
400 /* z and w are done by linear interpolation:
402 tri_linear_coeff(setup
, 0, 2);
403 tri_linear_coeff(setup
, 0, 3);
405 /* setup interpolation for all the remaining attributes:
407 for (slot
= 1; slot
< setup
->quad
.nr_attrs
; slot
++) {
408 switch (interp
[slot
]) {
409 case INTERP_CONSTANT
:
410 for (j
= 0; j
< NUM_CHANNELS
; j
++)
411 const_coeff(setup
, slot
, j
);
415 for (j
= 0; j
< NUM_CHANNELS
; j
++)
416 tri_linear_coeff(setup
, slot
, j
);
419 case INTERP_PERSPECTIVE
:
420 for (j
= 0; j
< NUM_CHANNELS
; j
++)
421 tri_persp_coeff(setup
, slot
, j
);
429 static void setup_tri_edges( struct setup_stage
*setup
)
431 GLfloat vmin_x
= setup
->vmin
->data
[0][0] + 0.5;
432 GLfloat vmid_x
= setup
->vmid
->data
[0][0] + 0.5;
434 GLfloat vmin_y
= setup
->vmin
->data
[0][1] - 0.5;
435 GLfloat vmid_y
= setup
->vmid
->data
[0][1] - 0.5;
436 GLfloat vmax_y
= setup
->vmax
->data
[0][1] - 0.5;
438 setup
->emaj
.sy
= ceilf(vmin_y
);
439 setup
->emaj
.lines
= (GLint
) ceilf(vmax_y
- setup
->emaj
.sy
);
440 setup
->emaj
.dxdy
= setup
->emaj
.dx
/ setup
->emaj
.dy
;
441 setup
->emaj
.sx
= vmin_x
+ (setup
->emaj
.sy
- vmin_y
) * setup
->emaj
.dxdy
;
443 setup
->etop
.sy
= ceilf(vmid_y
);
444 setup
->etop
.lines
= (GLint
) ceilf(vmax_y
- setup
->etop
.sy
);
445 setup
->etop
.dxdy
= setup
->etop
.dx
/ setup
->etop
.dy
;
446 setup
->etop
.sx
= vmid_x
+ (setup
->etop
.sy
- vmid_y
) * setup
->etop
.dxdy
;
448 setup
->ebot
.sy
= ceilf(vmin_y
);
449 setup
->ebot
.lines
= (GLint
) ceilf(vmid_y
- setup
->ebot
.sy
);
450 setup
->ebot
.dxdy
= setup
->ebot
.dx
/ setup
->ebot
.dy
;
451 setup
->ebot
.sx
= vmin_x
+ (setup
->ebot
.sy
- vmin_y
) * setup
->ebot
.dxdy
;
456 * Render the upper or lower half of a triangle.
457 * Scissoring is applied here too.
459 static void subtriangle( struct setup_stage
*setup
,
464 GLint y
, start_y
, finish_y
;
465 GLint sy
= (GLint
)eleft
->sy
;
467 assert((GLint
)eleft
->sy
== (GLint
) eright
->sy
);
468 assert((GLint
)eleft
->sy
>= 0); /* catch bug in x64? */
472 if (setup
->softpipe
->setup
.scissor
) {
474 finish_y
= start_y
+ lines
;
476 if (start_y
< setup
->softpipe
->scissor
.miny
)
477 start_y
= setup
->softpipe
->scissor
.miny
;
479 if (finish_y
> setup
->softpipe
->scissor
.maxy
)
480 finish_y
= setup
->softpipe
->scissor
.maxy
;
490 _mesa_printf("%s %d %d\n", __FUNCTION__
, start_y
, finish_y
);
492 for (y
= start_y
; y
< finish_y
; y
++) {
494 /* avoid accumulating adds as floats don't have the precision to
495 * accurately iterate large triangle edges that way. luckily we
496 * can just multiply these days.
498 * this is all drowned out by the attribute interpolation anyway.
500 GLint left
= (GLint
)(eleft
->sx
+ y
* eleft
->dxdy
);
501 GLint right
= (GLint
)(eright
->sx
+ y
* eright
->dxdy
);
505 if (setup
->softpipe
->setup
.scissor
) {
506 if (left
< setup
->softpipe
->scissor
.minx
)
507 left
= setup
->softpipe
->scissor
.minx
;
509 if (right
> setup
->softpipe
->scissor
.maxx
)
510 right
= setup
->softpipe
->scissor
.maxx
;
515 if (block(_y
) != setup
->span
.y
) {
517 setup
->span
.y
= block(_y
);
520 setup
->span
.left
[_y
&1] = left
;
521 setup
->span
.right
[_y
&1] = right
;
522 setup
->span
.y_flags
|= 1<<(_y
&1);
527 /* save the values so that emaj can be restarted:
529 eleft
->sx
+= lines
* eleft
->dxdy
;
530 eright
->sx
+= lines
* eright
->dxdy
;
537 * Do setup for triangle rasterization, then render the triangle.
539 static void setup_tri( struct prim_stage
*stage
,
540 struct prim_header
*prim
)
542 struct setup_stage
*setup
= setup_stage( stage
);
544 _mesa_printf("%s\n", __FUNCTION__
);
546 setup_sort_vertices( setup
, prim
);
547 setup_tri_coefficients( setup
);
548 setup_tri_edges( setup
);
551 setup
->span
.y_flags
= 0;
552 setup
->span
.right
[0] = 0;
553 setup
->span
.right
[1] = 0;
554 // setup->span.z_mode = tri_z_mode( setup->ctx );
556 // init_constant_attribs( setup );
558 if (setup
->oneoverarea
< 0.0) {
561 subtriangle( setup
, &setup
->emaj
, &setup
->ebot
, setup
->ebot
.lines
);
562 subtriangle( setup
, &setup
->emaj
, &setup
->etop
, setup
->etop
.lines
);
567 subtriangle( setup
, &setup
->ebot
, &setup
->emaj
, setup
->ebot
.lines
);
568 subtriangle( setup
, &setup
->etop
, &setup
->emaj
, setup
->etop
.lines
);
571 flush_spans( setup
);
577 * Compute a0, dadx and dady for a linearly interpolated coefficient,
581 line_linear_coeff(struct setup_stage
*setup
, GLuint slot
, GLuint i
)
583 const GLfloat dz
= setup
->vmax
->data
[slot
][i
] - setup
->vmin
->data
[slot
][i
];
584 const GLfloat dadx
= dz
* setup
->emaj
.dx
* setup
->oneoverarea
;
585 const GLfloat dady
= dz
* setup
->emaj
.dy
* setup
->oneoverarea
;
586 setup
->coef
[slot
].dadx
[i
] = dadx
;
587 setup
->coef
[slot
].dady
[i
] = dady
;
588 setup
->coef
[slot
].a0
[i
]
589 = (setup
->vmin
->data
[slot
][i
] -
590 (dadx
* (setup
->vmin
->data
[0][0] - 0.5) +
591 dady
* (setup
->vmin
->data
[0][1] - 0.5)));
596 * Compute a0, dadx and dady for a perspective-corrected interpolant,
600 line_persp_coeff(struct setup_stage
*setup
, GLuint slot
, GLuint i
)
603 line_linear_coeff(setup
, slot
, i
); /* XXX temporary */
608 * Compute the setup->coef[] array dadx, dady, a0 values.
609 * Must be called after setup->vmin,vmax are initialized.
612 setup_line_coefficients(struct setup_stage
*setup
, struct prim_header
*prim
)
614 const enum interp_mode
*interp
= setup
->softpipe
->interp
;
617 /* use setup->vmin, vmax to point to vertices */
618 setup
->vprovoke
= prim
->v
[1];
619 setup
->vmin
= prim
->v
[0];
620 setup
->vmax
= prim
->v
[1];
622 setup
->emaj
.dx
= setup
->vmax
->data
[0][0] - setup
->vmin
->data
[0][0];
623 setup
->emaj
.dy
= setup
->vmax
->data
[0][1] - setup
->vmin
->data
[0][1];
624 /* NOTE: this is not really 1/area */
625 setup
->oneoverarea
= 1.0 / (setup
->emaj
.dx
* setup
->emaj
.dx
+
626 setup
->emaj
.dy
* setup
->emaj
.dy
);
628 /* z and w are done by linear interpolation:
630 line_linear_coeff(setup
, 0, 2);
631 line_linear_coeff(setup
, 0, 3);
633 /* setup interpolation for all the remaining attributes:
635 for (slot
= 1; slot
< setup
->quad
.nr_attrs
; slot
++) {
636 switch (interp
[slot
]) {
637 case INTERP_CONSTANT
:
638 for (j
= 0; j
< NUM_CHANNELS
; j
++)
639 const_coeff(setup
, slot
, j
);
643 for (j
= 0; j
< NUM_CHANNELS
; j
++)
644 line_linear_coeff(setup
, slot
, j
);
647 case INTERP_PERSPECTIVE
:
648 for (j
= 0; j
< NUM_CHANNELS
; j
++)
649 line_persp_coeff(setup
, slot
, j
);
657 * Plot a pixel in a line segment.
660 plot(struct setup_stage
*setup
, GLint x
, GLint y
)
662 const GLint iy
= y
& 1;
663 const GLint ix
= x
& 1;
664 const GLint quadX
= x
- ix
;
665 const GLint quadY
= y
- iy
;
666 const GLint mask
= (1 << ix
) << (2 * iy
);
668 if (quadX
!= setup
->quad
.x0
||
669 quadY
!= setup
->quad
.y0
)
671 /* flush prev quad, start new quad */
673 if (setup
->quad
.x0
!= -1)
674 quad_emit(setup
->softpipe
, &setup
->quad
);
676 setup
->quad
.x0
= quadX
;
677 setup
->quad
.y0
= quadY
;
678 setup
->quad
.mask
= 0x0;
681 setup
->quad
.mask
|= mask
;
687 * Do setup for line rasterization, then render the line.
688 * XXX single-pixel width, no stipple, etc
689 * XXX no scissoring yet.
692 setup_line(struct prim_stage
*stage
, struct prim_header
*prim
)
694 const struct vertex_header
*v0
= prim
->v
[0];
695 const struct vertex_header
*v1
= prim
->v
[1];
696 struct setup_stage
*setup
= setup_stage( stage
);
698 GLint x0
= (GLint
) v0
->data
[0][0];
699 GLint x1
= (GLint
) v1
->data
[0][0];
700 GLint y0
= (GLint
) v0
->data
[0][1];
701 GLint y1
= (GLint
) v1
->data
[0][1];
706 if (dx
== 0 && dy
== 0)
709 setup_line_coefficients(setup
, prim
);
712 dx
= -dx
; /* make positive */
720 dy
= -dy
; /* make positive */
730 setup
->quad
.x0
= setup
->quad
.y0
= -1;
731 setup
->quad
.mask
= 0x0;
734 /*** X-major line ***/
736 const GLint errorInc
= dy
+ dy
;
737 GLint error
= errorInc
- dx
;
738 const GLint errorDec
= error
- dx
;
740 for (i
= 0; i
< dx
; i
++) {
754 /*** Y-major line ***/
756 const GLint errorInc
= dx
+ dx
;
757 GLint error
= errorInc
- dy
;
758 const GLint errorDec
= error
- dy
;
760 for (i
= 0; i
< dy
; i
++) {
775 /* draw final quad */
776 if (setup
->quad
.mask
) {
777 quad_emit(setup
->softpipe
, &setup
->quad
);
783 * Do setup for point rasterization, then render the point.
784 * Round or square points...
785 * XXX could optimize a lot for 1-pixel points.
788 setup_point(struct prim_stage
*stage
, struct prim_header
*prim
)
790 struct setup_stage
*setup
= setup_stage( stage
);
791 /*XXX this should be a vertex attrib! */
792 GLfloat halfSize
= 0.5 * setup
->softpipe
->setup
.point_size
;
793 GLboolean round
= setup
->softpipe
->setup
.point_smooth
;
794 const struct vertex_header
*v0
= prim
->v
[0];
795 const GLfloat x
= v0
->data
[FRAG_ATTRIB_WPOS
][0];
796 const GLfloat y
= v0
->data
[FRAG_ATTRIB_WPOS
][1];
799 /* For points, all interpolants are constant-valued.
800 * However, for point sprites, we'll need to setup texcoords appropriately.
801 * XXX: which coefficients are the texcoords???
802 * We may do point sprites as textured quads...
804 * KW: We don't know which coefficients are texcoords - ultimately
805 * the choice of what interpolation mode to use for each attribute
806 * should be determined by the fragment program, using
807 * per-attribute declaration statements that include interpolation
808 * mode as a parameter. So either the fragment program will have
809 * to be adjusted for pointsprite vs normal point behaviour, or
810 * otherwise a special interpolation mode will have to be defined
811 * which matches the required behaviour for point sprites. But -
812 * the latter is not a feature of normal hardware, and as such
813 * probably should be ruled out on that basis.
815 setup
->vprovoke
= prim
->v
[0];
816 const_coeff(setup
, 0, 2);
817 const_coeff(setup
, 0, 3);
818 for (slot
= 1; slot
< setup
->quad
.nr_attrs
; slot
++) {
819 for (j
= 0; j
< NUM_CHANNELS
; j
++)
820 const_coeff(setup
, slot
, j
);
823 /* XXX need to clip against scissor bounds too */
825 if (halfSize
<= 0.5 && !round
) {
826 /* special case for 1-pixel points */
827 const GLint ix
= ((GLint
) x
) & 1;
828 const GLint iy
= ((GLint
) y
) & 1;
829 setup
->quad
.x0
= x
- ix
;
830 setup
->quad
.y0
= y
- iy
;
831 setup
->quad
.mask
= (1 << ix
) << (2 * iy
);
832 quad_emit(setup
->softpipe
, &setup
->quad
);
835 const GLint ixmin
= block((GLint
) (x
- halfSize
));
836 const GLint ixmax
= block((GLint
) (x
+ halfSize
));
837 const GLint iymin
= block((GLint
) (y
- halfSize
));
838 const GLint iymax
= block((GLint
) (y
+ halfSize
));
839 GLfloat halfSizeSquared
= halfSize
* halfSize
;
842 for (iy
= iymin
; iy
<= iymax
; iy
+= 2) {
843 for (ix
= ixmin
; ix
<= ixmax
; ix
+= 2) {
847 /* XXX for GL_SMOOTH, need to compute per-fragment coverage too */
850 setup
->quad
.mask
= 0x0;
854 if (dx
* dx
+ dy
* dy
<= halfSizeSquared
)
855 setup
->quad
.mask
|= MASK_BOTTOM_LEFT
;
859 if (dx
* dx
+ dy
* dy
<= halfSizeSquared
)
860 setup
->quad
.mask
|= MASK_BOTTOM_RIGHT
;
864 if (dx
* dx
+ dy
* dy
<= halfSizeSquared
)
865 setup
->quad
.mask
|= MASK_TOP_LEFT
;
869 if (dx
* dx
+ dy
* dy
<= halfSizeSquared
)
870 setup
->quad
.mask
|= MASK_TOP_RIGHT
;
874 setup
->quad
.mask
= 0xf;
876 if (ix
+ 0.5 < x
- halfSize
)
877 setup
->quad
.mask
&= (MASK_BOTTOM_RIGHT
| MASK_TOP_RIGHT
);
879 if (ix
+ 1.5 > x
+ halfSize
)
880 setup
->quad
.mask
&= (MASK_BOTTOM_LEFT
| MASK_TOP_LEFT
);
882 if (iy
+ 0.5 < y
- halfSize
)
883 setup
->quad
.mask
&= (MASK_TOP_LEFT
| MASK_TOP_RIGHT
);
885 if (iy
+ 1.5 > y
+ halfSize
)
886 setup
->quad
.mask
&= (MASK_BOTTOM_LEFT
| MASK_BOTTOM_RIGHT
);
889 if (setup
->quad
.mask
) {
892 quad_emit( setup
->softpipe
, &setup
->quad
);
901 static void setup_end( struct prim_stage
*stage
)
906 struct prim_stage
*prim_setup( struct softpipe_context
*softpipe
)
908 struct setup_stage
*setup
= CALLOC_STRUCT(setup_stage
);
910 setup
->softpipe
= softpipe
;
911 setup
->stage
.draw
= softpipe
->draw
;
912 setup
->stage
.begin
= setup_begin
;
913 setup
->stage
.point
= setup_point
;
914 setup
->stage
.line
= setup_line
;
915 setup
->stage
.tri
= setup_tri
;
916 setup
->stage
.end
= setup_end
;
918 setup
->quad
.coef
= setup
->coef
;
920 return &setup
->stage
;