2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 #include "main/glheader.h"
27 #include "main/colormac.h"
28 #include "main/context.h"
29 #include "main/macros.h"
31 #include "s_context.h"
32 #include "s_feedback.h"
38 * Used to cull points with invalid coords
40 #define CULL_INVALID(V) \
42 float tmp = (V)->attrib[FRAG_ATTRIB_WPOS][0] \
43 + (V)->attrib[FRAG_ATTRIB_WPOS][1]; \
44 if (IS_INF_OR_NAN(tmp)) \
53 sprite_point(GLcontext
*ctx
, const SWvertex
*vert
)
55 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
58 GLuint tCoords
[MAX_TEXTURE_COORD_UNITS
+ 1];
59 GLuint numTcoords
= 0;
65 if (ctx
->DrawBuffer
->Visual
.depthBits
<= 16)
66 span
.z
= FloatToFixed(vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
68 span
.z
= (GLuint
) (vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
72 if (ctx
->Point
._Attenuated
|| ctx
->VertexProgram
.PointSizeEnabled
) {
73 /* use vertex's point size */
74 /* first, clamp attenuated size to the user-specifed range */
75 size
= CLAMP(vert
->pointSize
, ctx
->Point
.MinSize
, ctx
->Point
.MaxSize
);
78 /* use constant point size */
79 size
= ctx
->Point
.Size
;
81 /* clamp to non-AA implementation limits */
82 size
= CLAMP(size
, ctx
->Const
.MinPointSize
, ctx
->Const
.MaxPointSize
);
85 INIT_SPAN(span
, GL_POINT
);
86 span
.interpMask
= SPAN_Z
| SPAN_RGBA
;
88 span
.red
= ChanToFixed(vert
->color
[0]);
89 span
.green
= ChanToFixed(vert
->color
[1]);
90 span
.blue
= ChanToFixed(vert
->color
[2]);
91 span
.alpha
= ChanToFixed(vert
->color
[3]);
97 /* need these for fragment programs */
98 span
.attrStart
[FRAG_ATTRIB_WPOS
][3] = 1.0F
;
99 span
.attrStepX
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
100 span
.attrStepY
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
105 /* texcoord / pointcoord interpolants */
108 if (ctx
->Point
.SpriteOrigin
== GL_LOWER_LEFT
) {
119 if (attr
>= FRAG_ATTRIB_TEX0
&& attr
< FRAG_ATTRIB_VAR0
) {
120 const GLuint u
= attr
- FRAG_ATTRIB_TEX0
;
122 if (ctx
->Point
.CoordReplace
[u
]) {
123 tCoords
[numTcoords
++] = attr
;
125 if (ctx
->Point
.SpriteRMode
== GL_ZERO
)
127 else if (ctx
->Point
.SpriteRMode
== GL_S
)
128 r
= vert
->attrib
[attr
][0];
130 r
= vert
->attrib
[attr
][2];
132 span
.attrStart
[attr
][0] = s
;
133 span
.attrStart
[attr
][1] = 0.0; /* overwritten below */
134 span
.attrStart
[attr
][2] = r
;
135 span
.attrStart
[attr
][3] = 1.0;
137 span
.attrStepX
[attr
][0] = dsdx
;
138 span
.attrStepX
[attr
][1] = 0.0;
139 span
.attrStepX
[attr
][2] = 0.0;
140 span
.attrStepX
[attr
][3] = 0.0;
142 span
.attrStepY
[attr
][0] = 0.0;
143 span
.attrStepY
[attr
][1] = dtdy
;
144 span
.attrStepY
[attr
][2] = 0.0;
145 span
.attrStepY
[attr
][3] = 0.0;
150 else if (attr
== FRAG_ATTRIB_FOGC
) {
151 /* GLSL gl_PointCoord is stored in fog.zw */
152 span
.attrStart
[FRAG_ATTRIB_FOGC
][2] = 0.0;
153 span
.attrStart
[FRAG_ATTRIB_FOGC
][3] = 0.0; /* t0 set below */
154 span
.attrStepX
[FRAG_ATTRIB_FOGC
][2] = dsdx
;
155 span
.attrStepX
[FRAG_ATTRIB_FOGC
][3] = 0.0;
156 span
.attrStepY
[FRAG_ATTRIB_FOGC
][2] = 0.0;
157 span
.attrStepY
[FRAG_ATTRIB_FOGC
][3] = dtdy
;
158 tCoords
[numTcoords
++] = FRAG_ATTRIB_FOGC
;
161 /* use vertex's texcoord/attrib */
162 COPY_4V(span
.attrStart
[attr
], vert
->attrib
[attr
]);
163 ASSIGN_4V(span
.attrStepX
[attr
], 0, 0, 0, 0);
164 ASSIGN_4V(span
.attrStepY
[attr
], 0, 0, 0, 0);
168 /* compute pos, bounds and render */
170 const GLfloat x
= vert
->attrib
[FRAG_ATTRIB_WPOS
][0];
171 const GLfloat y
= vert
->attrib
[FRAG_ATTRIB_WPOS
][1];
172 GLint iSize
= (GLint
) (size
+ 0.5F
);
173 GLint xmin
, xmax
, ymin
, ymax
, iy
;
177 iSize
= MAX2(1, iSize
);
182 xmin
= (GLint
) (x
- iRadius
);
183 xmax
= (GLint
) (x
+ iRadius
);
184 ymin
= (GLint
) (y
- iRadius
);
185 ymax
= (GLint
) (y
+ iRadius
);
189 xmin
= (GLint
) x
- iRadius
+ 1;
190 xmax
= xmin
+ iSize
- 1;
191 ymin
= (GLint
) y
- iRadius
+ 1;
192 ymax
= ymin
+ iSize
- 1;
196 for (iy
= ymin
; iy
<= ymax
; iy
++) {
198 /* setup texcoord T for this row */
199 for (i
= 0; i
< numTcoords
; i
++) {
200 if (tCoords
[i
] == FRAG_ATTRIB_FOGC
)
201 span
.attrStart
[FRAG_ATTRIB_FOGC
][3] = tcoord
;
203 span
.attrStart
[tCoords
[i
]][1] = tcoord
;
206 /* these might get changed by span clipping */
209 span
.end
= xmax
- xmin
+ 1;
211 _swrast_write_rgba_span(ctx
, &span
);
220 * Draw smooth/antialiased point. RGB or CI mode.
223 smooth_point(GLcontext
*ctx
, const SWvertex
*vert
)
225 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
226 const GLboolean ciMode
= !ctx
->Visual
.rgbMode
;
228 GLfloat size
, alphaAtten
;
233 if (ctx
->DrawBuffer
->Visual
.depthBits
<= 16)
234 span
.z
= FloatToFixed(vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
236 span
.z
= (GLuint
) (vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
240 if (ctx
->Point
._Attenuated
|| ctx
->VertexProgram
.PointSizeEnabled
) {
241 /* use vertex's point size */
242 /* first, clamp attenuated size to the user-specifed range */
243 size
= CLAMP(vert
->pointSize
, ctx
->Point
.MinSize
, ctx
->Point
.MaxSize
);
246 /* use constant point size */
247 size
= ctx
->Point
.Size
;
249 /* clamp to AA implementation limits */
250 size
= CLAMP(size
, ctx
->Const
.MinPointSizeAA
, ctx
->Const
.MaxPointSizeAA
);
252 /* alpha attenuation / fade factor */
253 if (ctx
->Multisample
._Enabled
) {
254 if (vert
->pointSize
>= ctx
->Point
.Threshold
) {
258 GLfloat dsize
= vert
->pointSize
/ ctx
->Point
.Threshold
;
259 alphaAtten
= dsize
* dsize
;
265 (void) alphaAtten
; /* not used */
268 INIT_SPAN(span
, GL_POINT
);
269 span
.interpMask
= SPAN_Z
| SPAN_RGBA
;
270 span
.arrayMask
= SPAN_COVERAGE
| SPAN_MASK
;
272 span
.red
= ChanToFixed(vert
->color
[0]);
273 span
.green
= ChanToFixed(vert
->color
[1]);
274 span
.blue
= ChanToFixed(vert
->color
[2]);
275 span
.alpha
= ChanToFixed(vert
->color
[3]);
281 /* need these for fragment programs */
282 span
.attrStart
[FRAG_ATTRIB_WPOS
][3] = 1.0F
;
283 span
.attrStepX
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
284 span
.attrStepY
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
287 COPY_4V(span
.attrStart
[attr
], vert
->attrib
[attr
]);
288 ASSIGN_4V(span
.attrStepX
[attr
], 0, 0, 0, 0);
289 ASSIGN_4V(span
.attrStepY
[attr
], 0, 0, 0, 0);
292 /* compute pos, bounds and render */
294 const GLfloat x
= vert
->attrib
[FRAG_ATTRIB_WPOS
][0];
295 const GLfloat y
= vert
->attrib
[FRAG_ATTRIB_WPOS
][1];
296 const GLfloat radius
= 0.5F
* size
;
297 const GLfloat rmin
= radius
- 0.7071F
; /* 0.7071 = sqrt(2)/2 */
298 const GLfloat rmax
= radius
+ 0.7071F
;
299 const GLfloat rmin2
= MAX2(0.0F
, rmin
* rmin
);
300 const GLfloat rmax2
= rmax
* rmax
;
301 const GLfloat cscale
= 1.0F
/ (rmax2
- rmin2
);
302 const GLint xmin
= (GLint
) (x
- radius
);
303 const GLint xmax
= (GLint
) (x
+ radius
);
304 const GLint ymin
= (GLint
) (y
- radius
);
305 const GLint ymax
= (GLint
) (y
+ radius
);
308 for (iy
= ymin
; iy
<= ymax
; iy
++) {
310 /* these might get changed by span clipping */
313 span
.end
= xmax
- xmin
+ 1;
315 /* compute coverage for each pixel in span */
316 for (ix
= xmin
; ix
<= xmax
; ix
++) {
317 const GLfloat dx
= ix
- x
+ 0.5F
;
318 const GLfloat dy
= iy
- y
+ 0.5F
;
319 const GLfloat dist2
= dx
* dx
+ dy
* dy
;
323 if (dist2
>= rmin2
) {
324 /* compute partial coverage */
325 coverage
= 1.0F
- (dist2
- rmin2
) * cscale
;
327 /* coverage in [0,15] */
335 span
.array
->mask
[ix
- xmin
] = 1;
338 /* zero coverage - fragment outside the radius */
340 span
.array
->mask
[ix
- xmin
] = 0;
342 span
.array
->coverage
[ix
- xmin
] = coverage
;
346 _swrast_write_rgba_span(ctx
, &span
);
354 * Draw large (size >= 1) non-AA point. RGB or CI mode.
357 large_point(GLcontext
*ctx
, const SWvertex
*vert
)
359 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
360 const GLboolean ciMode
= !ctx
->Visual
.rgbMode
;
367 if (ctx
->DrawBuffer
->Visual
.depthBits
<= 16)
368 span
.z
= FloatToFixed(vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
370 span
.z
= (GLuint
) (vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
374 if (ctx
->Point
._Attenuated
|| ctx
->VertexProgram
.PointSizeEnabled
) {
375 /* use vertex's point size */
376 /* first, clamp attenuated size to the user-specifed range */
377 size
= CLAMP(vert
->pointSize
, ctx
->Point
.MinSize
, ctx
->Point
.MaxSize
);
380 /* use constant point size */
381 size
= ctx
->Point
.Size
;
383 /* clamp to non-AA implementation limits */
384 size
= CLAMP(size
, ctx
->Const
.MinPointSize
, ctx
->Const
.MaxPointSize
);
387 INIT_SPAN(span
, GL_POINT
);
388 span
.arrayMask
= SPAN_XY
;
391 span
.interpMask
= SPAN_Z
| SPAN_INDEX
;
392 span
.index
= FloatToFixed(vert
->attrib
[FRAG_ATTRIB_CI
][0]);
396 span
.interpMask
= SPAN_Z
| SPAN_RGBA
;
397 span
.red
= ChanToFixed(vert
->color
[0]);
398 span
.green
= ChanToFixed(vert
->color
[1]);
399 span
.blue
= ChanToFixed(vert
->color
[2]);
400 span
.alpha
= ChanToFixed(vert
->color
[3]);
407 /* need these for fragment programs */
408 span
.attrStart
[FRAG_ATTRIB_WPOS
][3] = 1.0F
;
409 span
.attrStepX
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
410 span
.attrStepY
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
413 COPY_4V(span
.attrStart
[attr
], vert
->attrib
[attr
]);
414 ASSIGN_4V(span
.attrStepX
[attr
], 0, 0, 0, 0);
415 ASSIGN_4V(span
.attrStepY
[attr
], 0, 0, 0, 0);
418 /* compute pos, bounds and render */
420 const GLfloat x
= vert
->attrib
[FRAG_ATTRIB_WPOS
][0];
421 const GLfloat y
= vert
->attrib
[FRAG_ATTRIB_WPOS
][1];
422 GLint iSize
= (GLint
) (size
+ 0.5F
);
423 GLint xmin
, xmax
, ymin
, ymax
, ix
, iy
;
426 iSize
= MAX2(1, iSize
);
431 xmin
= (GLint
) (x
- iRadius
);
432 xmax
= (GLint
) (x
+ iRadius
);
433 ymin
= (GLint
) (y
- iRadius
);
434 ymax
= (GLint
) (y
+ iRadius
);
438 xmin
= (GLint
) x
- iRadius
+ 1;
439 xmax
= xmin
+ iSize
- 1;
440 ymin
= (GLint
) y
- iRadius
+ 1;
441 ymax
= ymin
+ iSize
- 1;
444 /* generate fragments */
446 for (iy
= ymin
; iy
<= ymax
; iy
++) {
447 for (ix
= xmin
; ix
<= xmax
; ix
++) {
448 span
.array
->x
[span
.end
] = ix
;
449 span
.array
->y
[span
.end
] = iy
;
453 assert(span
.end
<= MAX_WIDTH
);
454 _swrast_write_rgba_span(ctx
, &span
);
460 * Draw size=1, single-pixel point
463 pixel_point(GLcontext
*ctx
, const SWvertex
*vert
)
465 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
466 const GLboolean ciMode
= !ctx
->Visual
.rgbMode
;
468 * Note that unlike the other functions, we put single-pixel points
469 * into a special span array in order to render as many points as
470 * possible with a single _swrast_write_rgba_span() call.
472 SWspan
*span
= &(swrast
->PointSpan
);
478 span
->interpMask
= 0;
479 span
->arrayMask
= SPAN_XY
| SPAN_Z
;
481 span
->arrayMask
|= SPAN_INDEX
;
483 span
->arrayMask
|= SPAN_RGBA
;
484 /*span->arrayMask |= SPAN_LAMBDA;*/
485 span
->arrayAttribs
= swrast
->_ActiveAttribMask
; /* we'll produce these vals */
487 /* need these for fragment programs */
488 span
->attrStart
[FRAG_ATTRIB_WPOS
][3] = 1.0F
;
489 span
->attrStepX
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
490 span
->attrStepY
[FRAG_ATTRIB_WPOS
][3] = 0.0F
;
492 /* check if we need to flush */
493 if (span
->end
>= MAX_WIDTH
||
494 (swrast
->_RasterMask
& (BLEND_BIT
| LOGIC_OP_BIT
| MASKING_BIT
))) {
496 _swrast_write_index_span(ctx
, span
);
498 _swrast_write_rgba_span(ctx
, span
);
504 /* fragment attributes */
506 span
->array
->index
[count
] = (GLuint
) vert
->attrib
[FRAG_ATTRIB_CI
][0];
509 span
->array
->rgba
[count
][RCOMP
] = vert
->color
[0];
510 span
->array
->rgba
[count
][GCOMP
] = vert
->color
[1];
511 span
->array
->rgba
[count
][BCOMP
] = vert
->color
[2];
512 span
->array
->rgba
[count
][ACOMP
] = vert
->color
[3];
515 COPY_4V(span
->array
->attribs
[attr
][count
], vert
->attrib
[attr
]);
518 /* fragment position */
519 span
->array
->x
[count
] = (GLint
) vert
->attrib
[FRAG_ATTRIB_WPOS
][0];
520 span
->array
->y
[count
] = (GLint
) vert
->attrib
[FRAG_ATTRIB_WPOS
][1];
521 span
->array
->z
[count
] = (GLint
) (vert
->attrib
[FRAG_ATTRIB_WPOS
][2] + 0.5F
);
523 span
->end
= count
+ 1;
524 ASSERT(span
->end
<= MAX_WIDTH
);
529 * Add specular color to primary color, draw point, restore original
533 _swrast_add_spec_terms_point(GLcontext
*ctx
, const SWvertex
*v0
)
535 SWvertex
*ncv0
= (SWvertex
*) v0
; /* cast away const */
536 GLfloat rSum
, gSum
, bSum
;
540 COPY_CHAN4(cSave
, ncv0
->color
);
542 rSum
= CHAN_TO_FLOAT(ncv0
->color
[0]) + ncv0
->attrib
[FRAG_ATTRIB_COL1
][0];
543 gSum
= CHAN_TO_FLOAT(ncv0
->color
[1]) + ncv0
->attrib
[FRAG_ATTRIB_COL1
][1];
544 bSum
= CHAN_TO_FLOAT(ncv0
->color
[2]) + ncv0
->attrib
[FRAG_ATTRIB_COL1
][2];
545 UNCLAMPED_FLOAT_TO_CHAN(ncv0
->color
[0], rSum
);
546 UNCLAMPED_FLOAT_TO_CHAN(ncv0
->color
[1], gSum
);
547 UNCLAMPED_FLOAT_TO_CHAN(ncv0
->color
[2], bSum
);
549 SWRAST_CONTEXT(ctx
)->SpecPoint(ctx
, ncv0
);
551 COPY_CHAN4(ncv0
->color
, cSave
);
556 * Examine current state to determine which point drawing function to use.
559 _swrast_choose_point(GLcontext
*ctx
)
561 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
563 if (ctx
->RenderMode
== GL_RENDER
) {
564 if (ctx
->Point
.PointSprite
) {
565 swrast
->Point
= sprite_point
;
567 else if (ctx
->Point
.SmoothFlag
) {
568 swrast
->Point
= smooth_point
;
570 else if (ctx
->Point
.Size
> 1.0 ||
571 ctx
->Point
._Attenuated
||
572 ctx
->VertexProgram
.PointSizeEnabled
) {
573 swrast
->Point
= large_point
;
576 swrast
->Point
= pixel_point
;
579 else if (ctx
->RenderMode
== GL_FEEDBACK
) {
580 swrast
->Point
= _swrast_feedback_point
;
584 swrast
->Point
= _swrast_select_point
;