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Merge remote branch 'origin/master' into gallium_draw_llvm
[mesa.git] / src / mesa / swrast / s_triangle.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.3
4 *
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 *
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:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
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.
23 */
24
25
26 /*
27 * When the device driver doesn't implement triangle rasterization it
28 * can hook in _swrast_Triangle, which eventually calls one of these
29 * functions to draw triangles.
30 */
31
32 #include "main/glheader.h"
33 #include "main/context.h"
34 #include "main/colormac.h"
35 #include "main/imports.h"
36 #include "main/macros.h"
37 #include "main/texformat.h"
38 #include "shader/prog_instruction.h"
39
40 #include "s_aatriangle.h"
41 #include "s_context.h"
42 #include "s_feedback.h"
43 #include "s_span.h"
44 #include "s_triangle.h"
45
46
47 /**
48 * Test if a triangle should be culled. Used for feedback and selection mode.
49 * \return GL_TRUE if the triangle is to be culled, GL_FALSE otherwise.
50 */
51 GLboolean
52 _swrast_culltriangle( GLcontext *ctx,
53 const SWvertex *v0,
54 const SWvertex *v1,
55 const SWvertex *v2 )
56 {
57 SWcontext *swrast = SWRAST_CONTEXT(ctx);
58 GLfloat ex = v1->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0];
59 GLfloat ey = v1->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1];
60 GLfloat fx = v2->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0];
61 GLfloat fy = v2->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1];
62 GLfloat c = ex*fy-ey*fx;
63
64 if (c * swrast->_BackfaceSign * swrast->_BackfaceCullSign <= 0.0F)
65 return GL_FALSE;
66
67 return GL_TRUE;
68 }
69
70
71
72 /*
73 * Render a flat-shaded RGBA triangle.
74 */
75 #define NAME flat_rgba_triangle
76 #define INTERP_Z 1
77 #define SETUP_CODE \
78 ASSERT(ctx->Texture._EnabledCoordUnits == 0);\
79 ASSERT(ctx->Light.ShadeModel==GL_FLAT); \
80 span.interpMask |= SPAN_RGBA; \
81 span.red = ChanToFixed(v2->color[0]); \
82 span.green = ChanToFixed(v2->color[1]); \
83 span.blue = ChanToFixed(v2->color[2]); \
84 span.alpha = ChanToFixed(v2->color[3]); \
85 span.redStep = 0; \
86 span.greenStep = 0; \
87 span.blueStep = 0; \
88 span.alphaStep = 0;
89 #define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
90 #include "s_tritemp.h"
91
92
93
94 /*
95 * Render a smooth-shaded RGBA triangle.
96 */
97 #define NAME smooth_rgba_triangle
98 #define INTERP_Z 1
99 #define INTERP_RGB 1
100 #define INTERP_ALPHA 1
101 #define SETUP_CODE \
102 { \
103 /* texturing must be off */ \
104 ASSERT(ctx->Texture._EnabledCoordUnits == 0); \
105 ASSERT(ctx->Light.ShadeModel==GL_SMOOTH); \
106 }
107 #define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
108 #include "s_tritemp.h"
109
110
111
112 /*
113 * Render an RGB, GL_DECAL, textured triangle.
114 * Interpolate S,T only w/out mipmapping or perspective correction.
115 *
116 * No fog. No depth testing.
117 */
118 #define NAME simple_textured_triangle
119 #define INTERP_INT_TEX 1
120 #define S_SCALE twidth
121 #define T_SCALE theight
122
123 #define SETUP_CODE \
124 struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \
125 const struct gl_texture_object *obj = \
126 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
127 const struct gl_texture_image *texImg = \
128 obj->Image[0][obj->BaseLevel]; \
129 const GLfloat twidth = (GLfloat) texImg->Width; \
130 const GLfloat theight = (GLfloat) texImg->Height; \
131 const GLint twidth_log2 = texImg->WidthLog2; \
132 const GLubyte *texture = (const GLubyte *) texImg->Data; \
133 const GLint smask = texImg->Width - 1; \
134 const GLint tmask = texImg->Height - 1; \
135 ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \
136 if (!rb || !texture) { \
137 return; \
138 }
139
140 #define RENDER_SPAN( span ) \
141 GLuint i; \
142 GLubyte rgb[MAX_WIDTH][3]; \
143 span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
144 span.intTex[1] -= FIXED_HALF; \
145 for (i = 0; i < span.end; i++) { \
146 GLint s = FixedToInt(span.intTex[0]) & smask; \
147 GLint t = FixedToInt(span.intTex[1]) & tmask; \
148 GLint pos = (t << twidth_log2) + s; \
149 pos = pos + pos + pos; /* multiply by 3 */ \
150 rgb[i][RCOMP] = texture[pos+2]; \
151 rgb[i][GCOMP] = texture[pos+1]; \
152 rgb[i][BCOMP] = texture[pos+0]; \
153 span.intTex[0] += span.intTexStep[0]; \
154 span.intTex[1] += span.intTexStep[1]; \
155 } \
156 rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, NULL);
157
158 #include "s_tritemp.h"
159
160
161
162 /*
163 * Render an RGB, GL_DECAL, textured triangle.
164 * Interpolate S,T, GL_LESS depth test, w/out mipmapping or
165 * perspective correction.
166 * Depth buffer bits must be <= sizeof(DEFAULT_SOFTWARE_DEPTH_TYPE)
167 *
168 * No fog.
169 */
170 #define NAME simple_z_textured_triangle
171 #define INTERP_Z 1
172 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
173 #define INTERP_INT_TEX 1
174 #define S_SCALE twidth
175 #define T_SCALE theight
176
177 #define SETUP_CODE \
178 struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \
179 const struct gl_texture_object *obj = \
180 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
181 const struct gl_texture_image *texImg = \
182 obj->Image[0][obj->BaseLevel]; \
183 const GLfloat twidth = (GLfloat) texImg->Width; \
184 const GLfloat theight = (GLfloat) texImg->Height; \
185 const GLint twidth_log2 = texImg->WidthLog2; \
186 const GLubyte *texture = (const GLubyte *) texImg->Data; \
187 const GLint smask = texImg->Width - 1; \
188 const GLint tmask = texImg->Height - 1; \
189 ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \
190 if (!rb || !texture) { \
191 return; \
192 }
193
194 #define RENDER_SPAN( span ) \
195 GLuint i; \
196 GLubyte rgb[MAX_WIDTH][3]; \
197 span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
198 span.intTex[1] -= FIXED_HALF; \
199 for (i = 0; i < span.end; i++) { \
200 const GLuint z = FixedToDepth(span.z); \
201 if (z < zRow[i]) { \
202 GLint s = FixedToInt(span.intTex[0]) & smask; \
203 GLint t = FixedToInt(span.intTex[1]) & tmask; \
204 GLint pos = (t << twidth_log2) + s; \
205 pos = pos + pos + pos; /* multiply by 3 */ \
206 rgb[i][RCOMP] = texture[pos+2]; \
207 rgb[i][GCOMP] = texture[pos+1]; \
208 rgb[i][BCOMP] = texture[pos+0]; \
209 zRow[i] = z; \
210 span.array->mask[i] = 1; \
211 } \
212 else { \
213 span.array->mask[i] = 0; \
214 } \
215 span.intTex[0] += span.intTexStep[0]; \
216 span.intTex[1] += span.intTexStep[1]; \
217 span.z += span.zStep; \
218 } \
219 rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, span.array->mask);
220
221 #include "s_tritemp.h"
222
223
224 #if CHAN_TYPE != GL_FLOAT
225
226 struct affine_info
227 {
228 GLenum filter;
229 GLenum format;
230 GLenum envmode;
231 GLint smask, tmask;
232 GLint twidth_log2;
233 const GLchan *texture;
234 GLfixed er, eg, eb, ea;
235 GLint tbytesline, tsize;
236 };
237
238
239 static INLINE GLint
240 ilerp(GLint t, GLint a, GLint b)
241 {
242 return a + ((t * (b - a)) >> FIXED_SHIFT);
243 }
244
245 static INLINE GLint
246 ilerp_2d(GLint ia, GLint ib, GLint v00, GLint v10, GLint v01, GLint v11)
247 {
248 const GLint temp0 = ilerp(ia, v00, v10);
249 const GLint temp1 = ilerp(ia, v01, v11);
250 return ilerp(ib, temp0, temp1);
251 }
252
253
254 /* This function can handle GL_NEAREST or GL_LINEAR sampling of 2D RGB or RGBA
255 * textures with GL_REPLACE, GL_MODULATE, GL_BLEND, GL_DECAL or GL_ADD
256 * texture env modes.
257 */
258 static INLINE void
259 affine_span(GLcontext *ctx, SWspan *span,
260 struct affine_info *info)
261 {
262 GLchan sample[4]; /* the filtered texture sample */
263 const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
264
265 /* Instead of defining a function for each mode, a test is done
266 * between the outer and inner loops. This is to reduce code size
267 * and complexity. Observe that an optimizing compiler kills
268 * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
269 */
270
271 #define NEAREST_RGB \
272 sample[RCOMP] = tex00[2]; \
273 sample[GCOMP] = tex00[1]; \
274 sample[BCOMP] = tex00[0]; \
275 sample[ACOMP] = CHAN_MAX;
276
277 #define LINEAR_RGB \
278 sample[RCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
279 sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
280 sample[BCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\
281 sample[ACOMP] = CHAN_MAX;
282
283 #define NEAREST_RGBA \
284 sample[RCOMP] = tex00[3]; \
285 sample[GCOMP] = tex00[2]; \
286 sample[BCOMP] = tex00[1]; \
287 sample[ACOMP] = tex00[0];
288
289 #define LINEAR_RGBA \
290 sample[RCOMP] = ilerp_2d(sf, tf, tex00[3], tex01[3], tex10[3], tex11[3]);\
291 sample[GCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
292 sample[BCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
293 sample[ACOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0])
294
295 #define MODULATE \
296 dest[RCOMP] = span->red * (sample[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \
297 dest[GCOMP] = span->green * (sample[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \
298 dest[BCOMP] = span->blue * (sample[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \
299 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1u) >> (FIXED_SHIFT + 8)
300
301 #define DECAL \
302 dest[RCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->red + \
303 ((sample[ACOMP] + 1) * sample[RCOMP] << FIXED_SHIFT)) \
304 >> (FIXED_SHIFT + 8); \
305 dest[GCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->green + \
306 ((sample[ACOMP] + 1) * sample[GCOMP] << FIXED_SHIFT)) \
307 >> (FIXED_SHIFT + 8); \
308 dest[BCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->blue + \
309 ((sample[ACOMP] + 1) * sample[BCOMP] << FIXED_SHIFT)) \
310 >> (FIXED_SHIFT + 8); \
311 dest[ACOMP] = FixedToInt(span->alpha)
312
313 #define BLEND \
314 dest[RCOMP] = ((CHAN_MAX - sample[RCOMP]) * span->red \
315 + (sample[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8); \
316 dest[GCOMP] = ((CHAN_MAX - sample[GCOMP]) * span->green \
317 + (sample[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8); \
318 dest[BCOMP] = ((CHAN_MAX - sample[BCOMP]) * span->blue \
319 + (sample[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8); \
320 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8)
321
322 #define REPLACE COPY_CHAN4(dest, sample)
323
324 #define ADD \
325 { \
326 GLint rSum = FixedToInt(span->red) + (GLint) sample[RCOMP]; \
327 GLint gSum = FixedToInt(span->green) + (GLint) sample[GCOMP]; \
328 GLint bSum = FixedToInt(span->blue) + (GLint) sample[BCOMP]; \
329 dest[RCOMP] = MIN2(rSum, CHAN_MAX); \
330 dest[GCOMP] = MIN2(gSum, CHAN_MAX); \
331 dest[BCOMP] = MIN2(bSum, CHAN_MAX); \
332 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8); \
333 }
334
335 /* shortcuts */
336
337 #define NEAREST_RGB_REPLACE \
338 NEAREST_RGB; \
339 dest[0] = sample[0]; \
340 dest[1] = sample[1]; \
341 dest[2] = sample[2]; \
342 dest[3] = FixedToInt(span->alpha);
343
344 #define NEAREST_RGBA_REPLACE \
345 dest[RCOMP] = tex00[3]; \
346 dest[GCOMP] = tex00[2]; \
347 dest[BCOMP] = tex00[1]; \
348 dest[ACOMP] = tex00[0]
349
350 #define SPAN_NEAREST(DO_TEX, COMPS) \
351 for (i = 0; i < span->end; i++) { \
352 /* Isn't it necessary to use FixedFloor below?? */ \
353 GLint s = FixedToInt(span->intTex[0]) & info->smask; \
354 GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
355 GLint pos = (t << info->twidth_log2) + s; \
356 const GLchan *tex00 = info->texture + COMPS * pos; \
357 DO_TEX; \
358 span->red += span->redStep; \
359 span->green += span->greenStep; \
360 span->blue += span->blueStep; \
361 span->alpha += span->alphaStep; \
362 span->intTex[0] += span->intTexStep[0]; \
363 span->intTex[1] += span->intTexStep[1]; \
364 dest += 4; \
365 }
366
367 #define SPAN_LINEAR(DO_TEX, COMPS) \
368 for (i = 0; i < span->end; i++) { \
369 /* Isn't it necessary to use FixedFloor below?? */ \
370 const GLint s = FixedToInt(span->intTex[0]) & info->smask; \
371 const GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
372 const GLfixed sf = span->intTex[0] & FIXED_FRAC_MASK; \
373 const GLfixed tf = span->intTex[1] & FIXED_FRAC_MASK; \
374 const GLint pos = (t << info->twidth_log2) + s; \
375 const GLchan *tex00 = info->texture + COMPS * pos; \
376 const GLchan *tex10 = tex00 + info->tbytesline; \
377 const GLchan *tex01 = tex00 + COMPS; \
378 const GLchan *tex11 = tex10 + COMPS; \
379 if (t == info->tmask) { \
380 tex10 -= info->tsize; \
381 tex11 -= info->tsize; \
382 } \
383 if (s == info->smask) { \
384 tex01 -= info->tbytesline; \
385 tex11 -= info->tbytesline; \
386 } \
387 DO_TEX; \
388 span->red += span->redStep; \
389 span->green += span->greenStep; \
390 span->blue += span->blueStep; \
391 span->alpha += span->alphaStep; \
392 span->intTex[0] += span->intTexStep[0]; \
393 span->intTex[1] += span->intTexStep[1]; \
394 dest += 4; \
395 }
396
397
398 GLuint i;
399 GLchan *dest = span->array->rgba[0];
400
401 /* Disable tex units so they're not re-applied in swrast_write_rgba_span */
402 ctx->Texture._EnabledCoordUnits = 0x0;
403
404 span->intTex[0] -= FIXED_HALF;
405 span->intTex[1] -= FIXED_HALF;
406 switch (info->filter) {
407 case GL_NEAREST:
408 switch (info->format) {
409 case MESA_FORMAT_RGB888:
410 switch (info->envmode) {
411 case GL_MODULATE:
412 SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
413 break;
414 case GL_DECAL:
415 case GL_REPLACE:
416 SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
417 break;
418 case GL_BLEND:
419 SPAN_NEAREST(NEAREST_RGB;BLEND,3);
420 break;
421 case GL_ADD:
422 SPAN_NEAREST(NEAREST_RGB;ADD,3);
423 break;
424 default:
425 _mesa_problem(ctx, "bad tex env mode in SPAN_LINEAR");
426 return;
427 }
428 break;
429 case MESA_FORMAT_RGBA8888:
430 switch(info->envmode) {
431 case GL_MODULATE:
432 SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
433 break;
434 case GL_DECAL:
435 SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
436 break;
437 case GL_BLEND:
438 SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
439 break;
440 case GL_ADD:
441 SPAN_NEAREST(NEAREST_RGBA;ADD,4);
442 break;
443 case GL_REPLACE:
444 SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
445 break;
446 default:
447 _mesa_problem(ctx, "bad tex env mode (2) in SPAN_LINEAR");
448 return;
449 }
450 break;
451 }
452 break;
453
454 case GL_LINEAR:
455 span->intTex[0] -= FIXED_HALF;
456 span->intTex[1] -= FIXED_HALF;
457 switch (info->format) {
458 case MESA_FORMAT_RGB888:
459 switch (info->envmode) {
460 case GL_MODULATE:
461 SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
462 break;
463 case GL_DECAL:
464 case GL_REPLACE:
465 SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
466 break;
467 case GL_BLEND:
468 SPAN_LINEAR(LINEAR_RGB;BLEND,3);
469 break;
470 case GL_ADD:
471 SPAN_LINEAR(LINEAR_RGB;ADD,3);
472 break;
473 default:
474 _mesa_problem(ctx, "bad tex env mode (3) in SPAN_LINEAR");
475 return;
476 }
477 break;
478 case MESA_FORMAT_RGBA8888:
479 switch (info->envmode) {
480 case GL_MODULATE:
481 SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
482 break;
483 case GL_DECAL:
484 SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
485 break;
486 case GL_BLEND:
487 SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
488 break;
489 case GL_ADD:
490 SPAN_LINEAR(LINEAR_RGBA;ADD,4);
491 break;
492 case GL_REPLACE:
493 SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
494 break;
495 default:
496 _mesa_problem(ctx, "bad tex env mode (4) in SPAN_LINEAR");
497 return;
498 }
499 break;
500 }
501 break;
502 }
503 span->interpMask &= ~SPAN_RGBA;
504 ASSERT(span->arrayMask & SPAN_RGBA);
505
506 _swrast_write_rgba_span(ctx, span);
507
508 /* re-enable texture units */
509 ctx->Texture._EnabledCoordUnits = texEnableSave;
510
511 #undef SPAN_NEAREST
512 #undef SPAN_LINEAR
513 }
514
515
516
517 /*
518 * Render an RGB/RGBA textured triangle without perspective correction.
519 */
520 #define NAME affine_textured_triangle
521 #define INTERP_Z 1
522 #define INTERP_RGB 1
523 #define INTERP_ALPHA 1
524 #define INTERP_INT_TEX 1
525 #define S_SCALE twidth
526 #define T_SCALE theight
527
528 #define SETUP_CODE \
529 struct affine_info info; \
530 struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
531 const struct gl_texture_object *obj = \
532 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
533 const struct gl_texture_image *texImg = \
534 obj->Image[0][obj->BaseLevel]; \
535 const GLfloat twidth = (GLfloat) texImg->Width; \
536 const GLfloat theight = (GLfloat) texImg->Height; \
537 info.texture = (const GLchan *) texImg->Data; \
538 info.twidth_log2 = texImg->WidthLog2; \
539 info.smask = texImg->Width - 1; \
540 info.tmask = texImg->Height - 1; \
541 info.format = texImg->TexFormat; \
542 info.filter = obj->MinFilter; \
543 info.envmode = unit->EnvMode; \
544 info.er = 0; \
545 info.eg = 0; \
546 info.eb = 0; \
547 span.arrayMask |= SPAN_RGBA; \
548 \
549 if (info.envmode == GL_BLEND) { \
550 /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
551 info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
552 info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
553 info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
554 info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
555 } \
556 if (!info.texture) { \
557 /* this shouldn't happen */ \
558 return; \
559 } \
560 \
561 switch (info.format) { \
562 case MESA_FORMAT_RGB888: \
563 info.tbytesline = texImg->Width * 3; \
564 break; \
565 case MESA_FORMAT_RGBA8888: \
566 info.tbytesline = texImg->Width * 4; \
567 break; \
568 default: \
569 _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\
570 return; \
571 } \
572 info.tsize = texImg->Height * info.tbytesline;
573
574 #define RENDER_SPAN( span ) affine_span(ctx, &span, &info);
575
576 #include "s_tritemp.h"
577
578
579
580 struct persp_info
581 {
582 GLenum filter;
583 GLenum format;
584 GLenum envmode;
585 GLint smask, tmask;
586 GLint twidth_log2;
587 const GLchan *texture;
588 GLfixed er, eg, eb, ea; /* texture env color */
589 GLint tbytesline, tsize;
590 };
591
592
593 static INLINE void
594 fast_persp_span(GLcontext *ctx, SWspan *span,
595 struct persp_info *info)
596 {
597 GLchan sample[4]; /* the filtered texture sample */
598
599 /* Instead of defining a function for each mode, a test is done
600 * between the outer and inner loops. This is to reduce code size
601 * and complexity. Observe that an optimizing compiler kills
602 * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
603 */
604 #define SPAN_NEAREST(DO_TEX,COMP) \
605 for (i = 0; i < span->end; i++) { \
606 GLdouble invQ = tex_coord[2] ? \
607 (1.0 / tex_coord[2]) : 1.0; \
608 GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
609 GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
610 GLint s = IFLOOR(s_tmp) & info->smask; \
611 GLint t = IFLOOR(t_tmp) & info->tmask; \
612 GLint pos = (t << info->twidth_log2) + s; \
613 const GLchan *tex00 = info->texture + COMP * pos; \
614 DO_TEX; \
615 span->red += span->redStep; \
616 span->green += span->greenStep; \
617 span->blue += span->blueStep; \
618 span->alpha += span->alphaStep; \
619 tex_coord[0] += tex_step[0]; \
620 tex_coord[1] += tex_step[1]; \
621 tex_coord[2] += tex_step[2]; \
622 dest += 4; \
623 }
624
625 #define SPAN_LINEAR(DO_TEX,COMP) \
626 for (i = 0; i < span->end; i++) { \
627 GLdouble invQ = tex_coord[2] ? \
628 (1.0 / tex_coord[2]) : 1.0; \
629 const GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
630 const GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
631 const GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF; \
632 const GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF; \
633 const GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \
634 const GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \
635 const GLfixed sf = s_fix & FIXED_FRAC_MASK; \
636 const GLfixed tf = t_fix & FIXED_FRAC_MASK; \
637 const GLint pos = (t << info->twidth_log2) + s; \
638 const GLchan *tex00 = info->texture + COMP * pos; \
639 const GLchan *tex10 = tex00 + info->tbytesline; \
640 const GLchan *tex01 = tex00 + COMP; \
641 const GLchan *tex11 = tex10 + COMP; \
642 if (t == info->tmask) { \
643 tex10 -= info->tsize; \
644 tex11 -= info->tsize; \
645 } \
646 if (s == info->smask) { \
647 tex01 -= info->tbytesline; \
648 tex11 -= info->tbytesline; \
649 } \
650 DO_TEX; \
651 span->red += span->redStep; \
652 span->green += span->greenStep; \
653 span->blue += span->blueStep; \
654 span->alpha += span->alphaStep; \
655 tex_coord[0] += tex_step[0]; \
656 tex_coord[1] += tex_step[1]; \
657 tex_coord[2] += tex_step[2]; \
658 dest += 4; \
659 }
660
661 GLuint i;
662 GLfloat tex_coord[3], tex_step[3];
663 GLchan *dest = span->array->rgba[0];
664
665 const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
666 ctx->Texture._EnabledCoordUnits = 0;
667
668 tex_coord[0] = span->attrStart[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
669 tex_step[0] = span->attrStepX[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
670 tex_coord[1] = span->attrStart[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
671 tex_step[1] = span->attrStepX[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
672 /* span->attrStart[FRAG_ATTRIB_TEX0][2] only if 3D-texturing, here only 2D */
673 tex_coord[2] = span->attrStart[FRAG_ATTRIB_TEX0][3];
674 tex_step[2] = span->attrStepX[FRAG_ATTRIB_TEX0][3];
675
676 switch (info->filter) {
677 case GL_NEAREST:
678 switch (info->format) {
679 case MESA_FORMAT_RGB888:
680 switch (info->envmode) {
681 case GL_MODULATE:
682 SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
683 break;
684 case GL_DECAL:
685 case GL_REPLACE:
686 SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
687 break;
688 case GL_BLEND:
689 SPAN_NEAREST(NEAREST_RGB;BLEND,3);
690 break;
691 case GL_ADD:
692 SPAN_NEAREST(NEAREST_RGB;ADD,3);
693 break;
694 default:
695 _mesa_problem(ctx, "bad tex env mode (5) in SPAN_LINEAR");
696 return;
697 }
698 break;
699 case MESA_FORMAT_RGBA8888:
700 switch(info->envmode) {
701 case GL_MODULATE:
702 SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
703 break;
704 case GL_DECAL:
705 SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
706 break;
707 case GL_BLEND:
708 SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
709 break;
710 case GL_ADD:
711 SPAN_NEAREST(NEAREST_RGBA;ADD,4);
712 break;
713 case GL_REPLACE:
714 SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
715 break;
716 default:
717 _mesa_problem(ctx, "bad tex env mode (6) in SPAN_LINEAR");
718 return;
719 }
720 break;
721 }
722 break;
723
724 case GL_LINEAR:
725 switch (info->format) {
726 case MESA_FORMAT_RGB888:
727 switch (info->envmode) {
728 case GL_MODULATE:
729 SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
730 break;
731 case GL_DECAL:
732 case GL_REPLACE:
733 SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
734 break;
735 case GL_BLEND:
736 SPAN_LINEAR(LINEAR_RGB;BLEND,3);
737 break;
738 case GL_ADD:
739 SPAN_LINEAR(LINEAR_RGB;ADD,3);
740 break;
741 default:
742 _mesa_problem(ctx, "bad tex env mode (7) in SPAN_LINEAR");
743 return;
744 }
745 break;
746 case MESA_FORMAT_RGBA8888:
747 switch (info->envmode) {
748 case GL_MODULATE:
749 SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
750 break;
751 case GL_DECAL:
752 SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
753 break;
754 case GL_BLEND:
755 SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
756 break;
757 case GL_ADD:
758 SPAN_LINEAR(LINEAR_RGBA;ADD,4);
759 break;
760 case GL_REPLACE:
761 SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
762 break;
763 default:
764 _mesa_problem(ctx, "bad tex env mode (8) in SPAN_LINEAR");
765 return;
766 }
767 break;
768 }
769 break;
770 }
771
772 ASSERT(span->arrayMask & SPAN_RGBA);
773 _swrast_write_rgba_span(ctx, span);
774
775 #undef SPAN_NEAREST
776 #undef SPAN_LINEAR
777
778 /* restore state */
779 ctx->Texture._EnabledCoordUnits = texEnableSave;
780 }
781
782
783 /*
784 * Render an perspective corrected RGB/RGBA textured triangle.
785 * The Q (aka V in Mesa) coordinate must be zero such that the divide
786 * by interpolated Q/W comes out right.
787 *
788 */
789 #define NAME persp_textured_triangle
790 #define INTERP_Z 1
791 #define INTERP_RGB 1
792 #define INTERP_ALPHA 1
793 #define INTERP_ATTRIBS 1
794
795 #define SETUP_CODE \
796 struct persp_info info; \
797 const struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
798 const struct gl_texture_object *obj = \
799 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
800 const struct gl_texture_image *texImg = \
801 obj->Image[0][obj->BaseLevel]; \
802 info.texture = (const GLchan *) texImg->Data; \
803 info.twidth_log2 = texImg->WidthLog2; \
804 info.smask = texImg->Width - 1; \
805 info.tmask = texImg->Height - 1; \
806 info.format = texImg->TexFormat; \
807 info.filter = obj->MinFilter; \
808 info.envmode = unit->EnvMode; \
809 info.er = 0; \
810 info.eg = 0; \
811 info.eb = 0; \
812 \
813 if (info.envmode == GL_BLEND) { \
814 /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
815 info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
816 info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
817 info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
818 info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
819 } \
820 if (!info.texture) { \
821 /* this shouldn't happen */ \
822 return; \
823 } \
824 \
825 switch (info.format) { \
826 case MESA_FORMAT_RGB888: \
827 info.tbytesline = texImg->Width * 3; \
828 break; \
829 case MESA_FORMAT_RGBA8888: \
830 info.tbytesline = texImg->Width * 4; \
831 break; \
832 default: \
833 _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\
834 return; \
835 } \
836 info.tsize = texImg->Height * info.tbytesline;
837
838 #define RENDER_SPAN( span ) \
839 span.interpMask &= ~SPAN_RGBA; \
840 span.arrayMask |= SPAN_RGBA; \
841 fast_persp_span(ctx, &span, &info);
842
843 #include "s_tritemp.h"
844
845 #endif /*CHAN_TYPE != GL_FLOAT*/
846
847
848
849 /*
850 * Render an RGBA triangle with arbitrary attributes.
851 */
852 #define NAME general_triangle
853 #define INTERP_Z 1
854 #define INTERP_RGB 1
855 #define INTERP_ALPHA 1
856 #define INTERP_ATTRIBS 1
857 #define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
858 #include "s_tritemp.h"
859
860
861
862
863 /*
864 * Special tri function for occlusion testing
865 */
866 #define NAME occlusion_zless_triangle
867 #define INTERP_Z 1
868 #define SETUP_CODE \
869 struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer; \
870 struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; \
871 ASSERT(ctx->Depth.Test); \
872 ASSERT(!ctx->Depth.Mask); \
873 ASSERT(ctx->Depth.Func == GL_LESS); \
874 if (!q) { \
875 return; \
876 }
877 #define RENDER_SPAN( span ) \
878 if (rb->Format == MESA_FORMAT_Z16) { \
879 GLuint i; \
880 const GLushort *zRow = (const GLushort *) \
881 rb->GetPointer(ctx, rb, span.x, span.y); \
882 for (i = 0; i < span.end; i++) { \
883 GLuint z = FixedToDepth(span.z); \
884 if (z < zRow[i]) { \
885 q->Result++; \
886 } \
887 span.z += span.zStep; \
888 } \
889 } \
890 else { \
891 GLuint i; \
892 const GLuint *zRow = (const GLuint *) \
893 rb->GetPointer(ctx, rb, span.x, span.y); \
894 for (i = 0; i < span.end; i++) { \
895 if ((GLuint)span.z < zRow[i]) { \
896 q->Result++; \
897 } \
898 span.z += span.zStep; \
899 } \
900 }
901 #include "s_tritemp.h"
902
903
904
905 static void
906 nodraw_triangle( GLcontext *ctx,
907 const SWvertex *v0,
908 const SWvertex *v1,
909 const SWvertex *v2 )
910 {
911 (void) (ctx && v0 && v1 && v2);
912 }
913
914
915 /*
916 * This is used when separate specular color is enabled, but not
917 * texturing. We add the specular color to the primary color,
918 * draw the triangle, then restore the original primary color.
919 * Inefficient, but seldom needed.
920 */
921 void
922 _swrast_add_spec_terms_triangle(GLcontext *ctx, const SWvertex *v0,
923 const SWvertex *v1, const SWvertex *v2)
924 {
925 SWvertex *ncv0 = (SWvertex *)v0; /* drop const qualifier */
926 SWvertex *ncv1 = (SWvertex *)v1;
927 SWvertex *ncv2 = (SWvertex *)v2;
928 GLfloat rSum, gSum, bSum;
929 GLchan cSave[3][4];
930
931 /* save original colors */
932 COPY_CHAN4( cSave[0], ncv0->color );
933 COPY_CHAN4( cSave[1], ncv1->color );
934 COPY_CHAN4( cSave[2], ncv2->color );
935 /* sum v0 */
936 rSum = CHAN_TO_FLOAT(ncv0->color[0]) + ncv0->attrib[FRAG_ATTRIB_COL1][0];
937 gSum = CHAN_TO_FLOAT(ncv0->color[1]) + ncv0->attrib[FRAG_ATTRIB_COL1][1];
938 bSum = CHAN_TO_FLOAT(ncv0->color[2]) + ncv0->attrib[FRAG_ATTRIB_COL1][2];
939 UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[0], rSum);
940 UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[1], gSum);
941 UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[2], bSum);
942 /* sum v1 */
943 rSum = CHAN_TO_FLOAT(ncv1->color[0]) + ncv1->attrib[FRAG_ATTRIB_COL1][0];
944 gSum = CHAN_TO_FLOAT(ncv1->color[1]) + ncv1->attrib[FRAG_ATTRIB_COL1][1];
945 bSum = CHAN_TO_FLOAT(ncv1->color[2]) + ncv1->attrib[FRAG_ATTRIB_COL1][2];
946 UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[0], rSum);
947 UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[1], gSum);
948 UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[2], bSum);
949 /* sum v2 */
950 rSum = CHAN_TO_FLOAT(ncv2->color[0]) + ncv2->attrib[FRAG_ATTRIB_COL1][0];
951 gSum = CHAN_TO_FLOAT(ncv2->color[1]) + ncv2->attrib[FRAG_ATTRIB_COL1][1];
952 bSum = CHAN_TO_FLOAT(ncv2->color[2]) + ncv2->attrib[FRAG_ATTRIB_COL1][2];
953 UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[0], rSum);
954 UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[1], gSum);
955 UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[2], bSum);
956 /* draw */
957 SWRAST_CONTEXT(ctx)->SpecTriangle( ctx, ncv0, ncv1, ncv2 );
958 /* restore original colors */
959 COPY_CHAN4( ncv0->color, cSave[0] );
960 COPY_CHAN4( ncv1->color, cSave[1] );
961 COPY_CHAN4( ncv2->color, cSave[2] );
962 }
963
964
965
966 #ifdef DEBUG
967
968 /* record the current triangle function name */
969 const char *_mesa_triFuncName = NULL;
970
971 #define USE(triFunc) \
972 do { \
973 _mesa_triFuncName = #triFunc; \
974 /*printf("%s\n", _mesa_triFuncName);*/ \
975 swrast->Triangle = triFunc; \
976 } while (0)
977
978 #else
979
980 #define USE(triFunc) swrast->Triangle = triFunc;
981
982 #endif
983
984
985
986
987 /*
988 * Determine which triangle rendering function to use given the current
989 * rendering context.
990 *
991 * Please update the summary flag _SWRAST_NEW_TRIANGLE if you add or
992 * remove tests to this code.
993 */
994 void
995 _swrast_choose_triangle( GLcontext *ctx )
996 {
997 SWcontext *swrast = SWRAST_CONTEXT(ctx);
998
999 if (ctx->Polygon.CullFlag &&
1000 ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
1001 USE(nodraw_triangle);
1002 return;
1003 }
1004
1005 if (ctx->RenderMode==GL_RENDER) {
1006
1007 if (ctx->Polygon.SmoothFlag) {
1008 _swrast_set_aa_triangle_function(ctx);
1009 ASSERT(swrast->Triangle);
1010 return;
1011 }
1012
1013 /* special case for occlusion testing */
1014 if (ctx->Query.CurrentOcclusionObject &&
1015 ctx->Depth.Test &&
1016 ctx->Depth.Mask == GL_FALSE &&
1017 ctx->Depth.Func == GL_LESS &&
1018 !ctx->Stencil._Enabled) {
1019 if (ctx->Color.ColorMask[0][0] == 0 &&
1020 ctx->Color.ColorMask[0][1] == 0 &&
1021 ctx->Color.ColorMask[0][2] == 0 &&
1022 ctx->Color.ColorMask[0][3] == 0) {
1023 USE(occlusion_zless_triangle);
1024 return;
1025 }
1026 }
1027
1028 /*
1029 * XXX should examine swrast->_ActiveAttribMask to determine what
1030 * needs to be interpolated.
1031 */
1032 if (ctx->Texture._EnabledCoordUnits ||
1033 ctx->FragmentProgram._Current ||
1034 ctx->ATIFragmentShader._Enabled ||
1035 NEED_SECONDARY_COLOR(ctx) ||
1036 swrast->_FogEnabled) {
1037 /* Ugh, we do a _lot_ of tests to pick the best textured tri func */
1038 const struct gl_texture_object *texObj2D;
1039 const struct gl_texture_image *texImg;
1040 GLenum minFilter, magFilter, envMode;
1041 gl_format format;
1042 texObj2D = ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];
1043
1044 texImg = texObj2D ? texObj2D->Image[0][texObj2D->BaseLevel] : NULL;
1045 format = texImg ? texImg->TexFormat : MESA_FORMAT_NONE;
1046 minFilter = texObj2D ? texObj2D->MinFilter : GL_NONE;
1047 magFilter = texObj2D ? texObj2D->MagFilter : GL_NONE;
1048 envMode = ctx->Texture.Unit[0].EnvMode;
1049
1050 /* First see if we can use an optimized 2-D texture function */
1051 if (ctx->Texture._EnabledCoordUnits == 0x1
1052 && !ctx->FragmentProgram._Current
1053 && !ctx->ATIFragmentShader._Enabled
1054 && ctx->Texture._EnabledUnits == 0x1
1055 && ctx->Texture.Unit[0]._ReallyEnabled == TEXTURE_2D_BIT
1056 && texObj2D->WrapS == GL_REPEAT
1057 && texObj2D->WrapT == GL_REPEAT
1058 && texObj2D->_Swizzle == SWIZZLE_NOOP
1059 && texImg->_IsPowerOfTwo
1060 && texImg->Border == 0
1061 && texImg->Width == texImg->RowStride
1062 && (format == MESA_FORMAT_RGB888 || format == MESA_FORMAT_RGBA8888)
1063 && minFilter == magFilter
1064 && ctx->Light.Model.ColorControl == GL_SINGLE_COLOR
1065 && !swrast->_FogEnabled
1066 && ctx->Texture.Unit[0].EnvMode != GL_COMBINE_EXT
1067 && ctx->Texture.Unit[0].EnvMode != GL_COMBINE4_NV) {
1068 if (ctx->Hint.PerspectiveCorrection==GL_FASTEST) {
1069 if (minFilter == GL_NEAREST
1070 && format == MESA_FORMAT_RGB888
1071 && (envMode == GL_REPLACE || envMode == GL_DECAL)
1072 && ((swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)
1073 && ctx->Depth.Func == GL_LESS
1074 && ctx->Depth.Mask == GL_TRUE)
1075 || swrast->_RasterMask == TEXTURE_BIT)
1076 && ctx->Polygon.StippleFlag == GL_FALSE
1077 && ctx->DrawBuffer->Visual.depthBits <= 16) {
1078 if (swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)) {
1079 USE(simple_z_textured_triangle);
1080 }
1081 else {
1082 USE(simple_textured_triangle);
1083 }
1084 }
1085 else {
1086 #if CHAN_BITS != 8
1087 USE(general_triangle);
1088 #else
1089 if (format == MESA_FORMAT_RGBA8888 && !_mesa_little_endian()) {
1090 /* We only handle RGBA8888 correctly on little endian
1091 * in the optimized code above.
1092 */
1093 USE(general_triangle);
1094 }
1095 else {
1096 USE(affine_textured_triangle);
1097 }
1098 #endif
1099 }
1100 }
1101 else {
1102 #if CHAN_BITS != 8
1103 USE(general_triangle);
1104 #else
1105 USE(persp_textured_triangle);
1106 #endif
1107 }
1108 }
1109 else {
1110 /* general case textured triangles */
1111 USE(general_triangle);
1112 }
1113 }
1114 else {
1115 ASSERT(!swrast->_FogEnabled);
1116 ASSERT(!NEED_SECONDARY_COLOR(ctx));
1117 if (ctx->Light.ShadeModel==GL_SMOOTH) {
1118 /* smooth shaded, no texturing, stippled or some raster ops */
1119 #if CHAN_BITS != 8
1120 USE(general_triangle);
1121 #else
1122 USE(smooth_rgba_triangle);
1123 #endif
1124 }
1125 else {
1126 /* flat shaded, no texturing, stippled or some raster ops */
1127 #if CHAN_BITS != 8
1128 USE(general_triangle);
1129 #else
1130 USE(flat_rgba_triangle);
1131 #endif
1132 }
1133 }
1134 }
1135 else if (ctx->RenderMode==GL_FEEDBACK) {
1136 USE(_swrast_feedback_triangle);
1137 }
1138 else {
1139 /* GL_SELECT mode */
1140 USE(_swrast_select_triangle);
1141 }
1142 }