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mesa: replace NEED_SECONDARY_COLOR(), RGBA_LOGICOP_ENABLED() with inlines
[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/mtypes.h"
38 #include "main/state.h"
39 #include "program/prog_instruction.h"
40
41 #include "s_aatriangle.h"
42 #include "s_context.h"
43 #include "s_feedback.h"
44 #include "s_span.h"
45 #include "s_triangle.h"
46
47
48 /**
49 * Test if a triangle should be culled. Used for feedback and selection mode.
50 * \return GL_TRUE if the triangle is to be culled, GL_FALSE otherwise.
51 */
52 GLboolean
53 _swrast_culltriangle( struct gl_context *ctx,
54 const SWvertex *v0,
55 const SWvertex *v1,
56 const SWvertex *v2 )
57 {
58 SWcontext *swrast = SWRAST_CONTEXT(ctx);
59 GLfloat ex = v1->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0];
60 GLfloat ey = v1->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1];
61 GLfloat fx = v2->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0];
62 GLfloat fy = v2->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1];
63 GLfloat c = ex*fy-ey*fx;
64
65 if (c * swrast->_BackfaceSign * swrast->_BackfaceCullSign <= 0.0F)
66 return GL_FALSE;
67
68 return GL_TRUE;
69 }
70
71
72
73 /*
74 * Render a flat-shaded RGBA triangle.
75 */
76 #define NAME flat_rgba_triangle
77 #define INTERP_Z 1
78 #define SETUP_CODE \
79 ASSERT(ctx->Texture._EnabledCoordUnits == 0);\
80 ASSERT(ctx->Light.ShadeModel==GL_FLAT); \
81 span.interpMask |= SPAN_RGBA; \
82 span.red = ChanToFixed(v2->color[0]); \
83 span.green = ChanToFixed(v2->color[1]); \
84 span.blue = ChanToFixed(v2->color[2]); \
85 span.alpha = ChanToFixed(v2->color[3]); \
86 span.redStep = 0; \
87 span.greenStep = 0; \
88 span.blueStep = 0; \
89 span.alphaStep = 0;
90 #define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
91 #include "s_tritemp.h"
92
93
94
95 /*
96 * Render a smooth-shaded RGBA triangle.
97 */
98 #define NAME smooth_rgba_triangle
99 #define INTERP_Z 1
100 #define INTERP_RGB 1
101 #define INTERP_ALPHA 1
102 #define SETUP_CODE \
103 { \
104 /* texturing must be off */ \
105 ASSERT(ctx->Texture._EnabledCoordUnits == 0); \
106 ASSERT(ctx->Light.ShadeModel==GL_SMOOTH); \
107 }
108 #define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
109 #include "s_tritemp.h"
110
111
112
113 /*
114 * Render an RGB, GL_DECAL, textured triangle.
115 * Interpolate S,T only w/out mipmapping or perspective correction.
116 *
117 * No fog. No depth testing.
118 */
119 #define NAME simple_textured_triangle
120 #define INTERP_INT_TEX 1
121 #define S_SCALE twidth
122 #define T_SCALE theight
123
124 #define SETUP_CODE \
125 struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \
126 const struct gl_texture_object *obj = \
127 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
128 const struct gl_texture_image *texImg = \
129 obj->Image[0][obj->BaseLevel]; \
130 const GLfloat twidth = (GLfloat) texImg->Width; \
131 const GLfloat theight = (GLfloat) texImg->Height; \
132 const GLint twidth_log2 = texImg->WidthLog2; \
133 const GLubyte *texture = (const GLubyte *) texImg->Data; \
134 const GLint smask = texImg->Width - 1; \
135 const GLint tmask = texImg->Height - 1; \
136 ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \
137 if (!rb || !texture) { \
138 return; \
139 }
140
141 #define RENDER_SPAN( span ) \
142 GLuint i; \
143 GLubyte rgb[MAX_WIDTH][3]; \
144 span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
145 span.intTex[1] -= FIXED_HALF; \
146 for (i = 0; i < span.end; i++) { \
147 GLint s = FixedToInt(span.intTex[0]) & smask; \
148 GLint t = FixedToInt(span.intTex[1]) & tmask; \
149 GLint pos = (t << twidth_log2) + s; \
150 pos = pos + pos + pos; /* multiply by 3 */ \
151 rgb[i][RCOMP] = texture[pos+2]; \
152 rgb[i][GCOMP] = texture[pos+1]; \
153 rgb[i][BCOMP] = texture[pos+0]; \
154 span.intTex[0] += span.intTexStep[0]; \
155 span.intTex[1] += span.intTexStep[1]; \
156 } \
157 rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, NULL);
158
159 #include "s_tritemp.h"
160
161
162
163 /*
164 * Render an RGB, GL_DECAL, textured triangle.
165 * Interpolate S,T, GL_LESS depth test, w/out mipmapping or
166 * perspective correction.
167 * Depth buffer bits must be <= sizeof(DEFAULT_SOFTWARE_DEPTH_TYPE)
168 *
169 * No fog.
170 */
171 #define NAME simple_z_textured_triangle
172 #define INTERP_Z 1
173 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
174 #define INTERP_INT_TEX 1
175 #define S_SCALE twidth
176 #define T_SCALE theight
177
178 #define SETUP_CODE \
179 struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \
180 const struct gl_texture_object *obj = \
181 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
182 const struct gl_texture_image *texImg = \
183 obj->Image[0][obj->BaseLevel]; \
184 const GLfloat twidth = (GLfloat) texImg->Width; \
185 const GLfloat theight = (GLfloat) texImg->Height; \
186 const GLint twidth_log2 = texImg->WidthLog2; \
187 const GLubyte *texture = (const GLubyte *) texImg->Data; \
188 const GLint smask = texImg->Width - 1; \
189 const GLint tmask = texImg->Height - 1; \
190 ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \
191 if (!rb || !texture) { \
192 return; \
193 }
194
195 #define RENDER_SPAN( span ) \
196 GLuint i; \
197 GLubyte rgb[MAX_WIDTH][3]; \
198 span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
199 span.intTex[1] -= FIXED_HALF; \
200 for (i = 0; i < span.end; i++) { \
201 const GLuint z = FixedToDepth(span.z); \
202 if (z < zRow[i]) { \
203 GLint s = FixedToInt(span.intTex[0]) & smask; \
204 GLint t = FixedToInt(span.intTex[1]) & tmask; \
205 GLint pos = (t << twidth_log2) + s; \
206 pos = pos + pos + pos; /* multiply by 3 */ \
207 rgb[i][RCOMP] = texture[pos+2]; \
208 rgb[i][GCOMP] = texture[pos+1]; \
209 rgb[i][BCOMP] = texture[pos+0]; \
210 zRow[i] = z; \
211 span.array->mask[i] = 1; \
212 } \
213 else { \
214 span.array->mask[i] = 0; \
215 } \
216 span.intTex[0] += span.intTexStep[0]; \
217 span.intTex[1] += span.intTexStep[1]; \
218 span.z += span.zStep; \
219 } \
220 rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, span.array->mask);
221
222 #include "s_tritemp.h"
223
224
225 #if CHAN_TYPE != GL_FLOAT
226
227 struct affine_info
228 {
229 GLenum filter;
230 GLenum format;
231 GLenum envmode;
232 GLint smask, tmask;
233 GLint twidth_log2;
234 const GLchan *texture;
235 GLfixed er, eg, eb, ea;
236 GLint tbytesline, tsize;
237 };
238
239
240 static INLINE GLint
241 ilerp(GLint t, GLint a, GLint b)
242 {
243 return a + ((t * (b - a)) >> FIXED_SHIFT);
244 }
245
246 static INLINE GLint
247 ilerp_2d(GLint ia, GLint ib, GLint v00, GLint v10, GLint v01, GLint v11)
248 {
249 const GLint temp0 = ilerp(ia, v00, v10);
250 const GLint temp1 = ilerp(ia, v01, v11);
251 return ilerp(ib, temp0, temp1);
252 }
253
254
255 /* This function can handle GL_NEAREST or GL_LINEAR sampling of 2D RGB or RGBA
256 * textures with GL_REPLACE, GL_MODULATE, GL_BLEND, GL_DECAL or GL_ADD
257 * texture env modes.
258 */
259 static INLINE void
260 affine_span(struct gl_context *ctx, SWspan *span,
261 struct affine_info *info)
262 {
263 GLchan sample[4]; /* the filtered texture sample */
264 const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
265
266 /* Instead of defining a function for each mode, a test is done
267 * between the outer and inner loops. This is to reduce code size
268 * and complexity. Observe that an optimizing compiler kills
269 * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
270 */
271
272 #define NEAREST_RGB \
273 sample[RCOMP] = tex00[2]; \
274 sample[GCOMP] = tex00[1]; \
275 sample[BCOMP] = tex00[0]; \
276 sample[ACOMP] = CHAN_MAX;
277
278 #define LINEAR_RGB \
279 sample[RCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
280 sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
281 sample[BCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\
282 sample[ACOMP] = CHAN_MAX;
283
284 #define NEAREST_RGBA \
285 sample[RCOMP] = tex00[3]; \
286 sample[GCOMP] = tex00[2]; \
287 sample[BCOMP] = tex00[1]; \
288 sample[ACOMP] = tex00[0];
289
290 #define LINEAR_RGBA \
291 sample[RCOMP] = ilerp_2d(sf, tf, tex00[3], tex01[3], tex10[3], tex11[3]);\
292 sample[GCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
293 sample[BCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
294 sample[ACOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0])
295
296 #define MODULATE \
297 dest[RCOMP] = span->red * (sample[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \
298 dest[GCOMP] = span->green * (sample[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \
299 dest[BCOMP] = span->blue * (sample[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \
300 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1u) >> (FIXED_SHIFT + 8)
301
302 #define DECAL \
303 dest[RCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->red + \
304 ((sample[ACOMP] + 1) * sample[RCOMP] << FIXED_SHIFT)) \
305 >> (FIXED_SHIFT + 8); \
306 dest[GCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->green + \
307 ((sample[ACOMP] + 1) * sample[GCOMP] << FIXED_SHIFT)) \
308 >> (FIXED_SHIFT + 8); \
309 dest[BCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->blue + \
310 ((sample[ACOMP] + 1) * sample[BCOMP] << FIXED_SHIFT)) \
311 >> (FIXED_SHIFT + 8); \
312 dest[ACOMP] = FixedToInt(span->alpha)
313
314 #define BLEND \
315 dest[RCOMP] = ((CHAN_MAX - sample[RCOMP]) * span->red \
316 + (sample[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8); \
317 dest[GCOMP] = ((CHAN_MAX - sample[GCOMP]) * span->green \
318 + (sample[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8); \
319 dest[BCOMP] = ((CHAN_MAX - sample[BCOMP]) * span->blue \
320 + (sample[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8); \
321 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8)
322
323 #define REPLACE COPY_CHAN4(dest, sample)
324
325 #define ADD \
326 { \
327 GLint rSum = FixedToInt(span->red) + (GLint) sample[RCOMP]; \
328 GLint gSum = FixedToInt(span->green) + (GLint) sample[GCOMP]; \
329 GLint bSum = FixedToInt(span->blue) + (GLint) sample[BCOMP]; \
330 dest[RCOMP] = MIN2(rSum, CHAN_MAX); \
331 dest[GCOMP] = MIN2(gSum, CHAN_MAX); \
332 dest[BCOMP] = MIN2(bSum, CHAN_MAX); \
333 dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8); \
334 }
335
336 /* shortcuts */
337
338 #define NEAREST_RGB_REPLACE \
339 NEAREST_RGB; \
340 dest[0] = sample[0]; \
341 dest[1] = sample[1]; \
342 dest[2] = sample[2]; \
343 dest[3] = FixedToInt(span->alpha);
344
345 #define NEAREST_RGBA_REPLACE \
346 dest[RCOMP] = tex00[3]; \
347 dest[GCOMP] = tex00[2]; \
348 dest[BCOMP] = tex00[1]; \
349 dest[ACOMP] = tex00[0]
350
351 #define SPAN_NEAREST(DO_TEX, COMPS) \
352 for (i = 0; i < span->end; i++) { \
353 /* Isn't it necessary to use FixedFloor below?? */ \
354 GLint s = FixedToInt(span->intTex[0]) & info->smask; \
355 GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
356 GLint pos = (t << info->twidth_log2) + s; \
357 const GLchan *tex00 = info->texture + COMPS * pos; \
358 DO_TEX; \
359 span->red += span->redStep; \
360 span->green += span->greenStep; \
361 span->blue += span->blueStep; \
362 span->alpha += span->alphaStep; \
363 span->intTex[0] += span->intTexStep[0]; \
364 span->intTex[1] += span->intTexStep[1]; \
365 dest += 4; \
366 }
367
368 #define SPAN_LINEAR(DO_TEX, COMPS) \
369 for (i = 0; i < span->end; i++) { \
370 /* Isn't it necessary to use FixedFloor below?? */ \
371 const GLint s = FixedToInt(span->intTex[0]) & info->smask; \
372 const GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
373 const GLfixed sf = span->intTex[0] & FIXED_FRAC_MASK; \
374 const GLfixed tf = span->intTex[1] & FIXED_FRAC_MASK; \
375 const GLint pos = (t << info->twidth_log2) + s; \
376 const GLchan *tex00 = info->texture + COMPS * pos; \
377 const GLchan *tex10 = tex00 + info->tbytesline; \
378 const GLchan *tex01 = tex00 + COMPS; \
379 const GLchan *tex11 = tex10 + COMPS; \
380 if (t == info->tmask) { \
381 tex10 -= info->tsize; \
382 tex11 -= info->tsize; \
383 } \
384 if (s == info->smask) { \
385 tex01 -= info->tbytesline; \
386 tex11 -= info->tbytesline; \
387 } \
388 DO_TEX; \
389 span->red += span->redStep; \
390 span->green += span->greenStep; \
391 span->blue += span->blueStep; \
392 span->alpha += span->alphaStep; \
393 span->intTex[0] += span->intTexStep[0]; \
394 span->intTex[1] += span->intTexStep[1]; \
395 dest += 4; \
396 }
397
398
399 GLuint i;
400 GLchan *dest = span->array->rgba[0];
401
402 /* Disable tex units so they're not re-applied in swrast_write_rgba_span */
403 ctx->Texture._EnabledCoordUnits = 0x0;
404
405 span->intTex[0] -= FIXED_HALF;
406 span->intTex[1] -= FIXED_HALF;
407 switch (info->filter) {
408 case GL_NEAREST:
409 switch (info->format) {
410 case MESA_FORMAT_RGB888:
411 switch (info->envmode) {
412 case GL_MODULATE:
413 SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
414 break;
415 case GL_DECAL:
416 case GL_REPLACE:
417 SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
418 break;
419 case GL_BLEND:
420 SPAN_NEAREST(NEAREST_RGB;BLEND,3);
421 break;
422 case GL_ADD:
423 SPAN_NEAREST(NEAREST_RGB;ADD,3);
424 break;
425 default:
426 _mesa_problem(ctx, "bad tex env mode in SPAN_LINEAR");
427 return;
428 }
429 break;
430 case MESA_FORMAT_RGBA8888:
431 switch(info->envmode) {
432 case GL_MODULATE:
433 SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
434 break;
435 case GL_DECAL:
436 SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
437 break;
438 case GL_BLEND:
439 SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
440 break;
441 case GL_ADD:
442 SPAN_NEAREST(NEAREST_RGBA;ADD,4);
443 break;
444 case GL_REPLACE:
445 SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
446 break;
447 default:
448 _mesa_problem(ctx, "bad tex env mode (2) in SPAN_LINEAR");
449 return;
450 }
451 break;
452 }
453 break;
454
455 case GL_LINEAR:
456 span->intTex[0] -= FIXED_HALF;
457 span->intTex[1] -= FIXED_HALF;
458 switch (info->format) {
459 case MESA_FORMAT_RGB888:
460 switch (info->envmode) {
461 case GL_MODULATE:
462 SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
463 break;
464 case GL_DECAL:
465 case GL_REPLACE:
466 SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
467 break;
468 case GL_BLEND:
469 SPAN_LINEAR(LINEAR_RGB;BLEND,3);
470 break;
471 case GL_ADD:
472 SPAN_LINEAR(LINEAR_RGB;ADD,3);
473 break;
474 default:
475 _mesa_problem(ctx, "bad tex env mode (3) in SPAN_LINEAR");
476 return;
477 }
478 break;
479 case MESA_FORMAT_RGBA8888:
480 switch (info->envmode) {
481 case GL_MODULATE:
482 SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
483 break;
484 case GL_DECAL:
485 SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
486 break;
487 case GL_BLEND:
488 SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
489 break;
490 case GL_ADD:
491 SPAN_LINEAR(LINEAR_RGBA;ADD,4);
492 break;
493 case GL_REPLACE:
494 SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
495 break;
496 default:
497 _mesa_problem(ctx, "bad tex env mode (4) in SPAN_LINEAR");
498 return;
499 }
500 break;
501 }
502 break;
503 }
504 span->interpMask &= ~SPAN_RGBA;
505 ASSERT(span->arrayMask & SPAN_RGBA);
506
507 _swrast_write_rgba_span(ctx, span);
508
509 /* re-enable texture units */
510 ctx->Texture._EnabledCoordUnits = texEnableSave;
511
512 #undef SPAN_NEAREST
513 #undef SPAN_LINEAR
514 }
515
516
517
518 /*
519 * Render an RGB/RGBA textured triangle without perspective correction.
520 */
521 #define NAME affine_textured_triangle
522 #define INTERP_Z 1
523 #define INTERP_RGB 1
524 #define INTERP_ALPHA 1
525 #define INTERP_INT_TEX 1
526 #define S_SCALE twidth
527 #define T_SCALE theight
528
529 #define SETUP_CODE \
530 struct affine_info info; \
531 struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
532 const struct gl_texture_object *obj = \
533 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
534 const struct gl_texture_image *texImg = \
535 obj->Image[0][obj->BaseLevel]; \
536 const GLfloat twidth = (GLfloat) texImg->Width; \
537 const GLfloat theight = (GLfloat) texImg->Height; \
538 info.texture = (const GLchan *) texImg->Data; \
539 info.twidth_log2 = texImg->WidthLog2; \
540 info.smask = texImg->Width - 1; \
541 info.tmask = texImg->Height - 1; \
542 info.format = texImg->TexFormat; \
543 info.filter = obj->MinFilter; \
544 info.envmode = unit->EnvMode; \
545 info.er = 0; \
546 info.eg = 0; \
547 info.eb = 0; \
548 span.arrayMask |= SPAN_RGBA; \
549 \
550 if (info.envmode == GL_BLEND) { \
551 /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
552 info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
553 info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
554 info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
555 info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
556 } \
557 if (!info.texture) { \
558 /* this shouldn't happen */ \
559 return; \
560 } \
561 \
562 switch (info.format) { \
563 case MESA_FORMAT_RGB888: \
564 info.tbytesline = texImg->Width * 3; \
565 break; \
566 case MESA_FORMAT_RGBA8888: \
567 info.tbytesline = texImg->Width * 4; \
568 break; \
569 default: \
570 _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\
571 return; \
572 } \
573 info.tsize = texImg->Height * info.tbytesline;
574
575 #define RENDER_SPAN( span ) affine_span(ctx, &span, &info);
576
577 #include "s_tritemp.h"
578
579
580
581 struct persp_info
582 {
583 GLenum filter;
584 GLenum format;
585 GLenum envmode;
586 GLint smask, tmask;
587 GLint twidth_log2;
588 const GLchan *texture;
589 GLfixed er, eg, eb, ea; /* texture env color */
590 GLint tbytesline, tsize;
591 };
592
593
594 static INLINE void
595 fast_persp_span(struct gl_context *ctx, SWspan *span,
596 struct persp_info *info)
597 {
598 GLchan sample[4]; /* the filtered texture sample */
599
600 /* Instead of defining a function for each mode, a test is done
601 * between the outer and inner loops. This is to reduce code size
602 * and complexity. Observe that an optimizing compiler kills
603 * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
604 */
605 #define SPAN_NEAREST(DO_TEX,COMP) \
606 for (i = 0; i < span->end; i++) { \
607 GLdouble invQ = tex_coord[2] ? \
608 (1.0 / tex_coord[2]) : 1.0; \
609 GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
610 GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
611 GLint s = IFLOOR(s_tmp) & info->smask; \
612 GLint t = IFLOOR(t_tmp) & info->tmask; \
613 GLint pos = (t << info->twidth_log2) + s; \
614 const GLchan *tex00 = info->texture + COMP * pos; \
615 DO_TEX; \
616 span->red += span->redStep; \
617 span->green += span->greenStep; \
618 span->blue += span->blueStep; \
619 span->alpha += span->alphaStep; \
620 tex_coord[0] += tex_step[0]; \
621 tex_coord[1] += tex_step[1]; \
622 tex_coord[2] += tex_step[2]; \
623 dest += 4; \
624 }
625
626 #define SPAN_LINEAR(DO_TEX,COMP) \
627 for (i = 0; i < span->end; i++) { \
628 GLdouble invQ = tex_coord[2] ? \
629 (1.0 / tex_coord[2]) : 1.0; \
630 const GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
631 const GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
632 const GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF; \
633 const GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF; \
634 const GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \
635 const GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \
636 const GLfixed sf = s_fix & FIXED_FRAC_MASK; \
637 const GLfixed tf = t_fix & FIXED_FRAC_MASK; \
638 const GLint pos = (t << info->twidth_log2) + s; \
639 const GLchan *tex00 = info->texture + COMP * pos; \
640 const GLchan *tex10 = tex00 + info->tbytesline; \
641 const GLchan *tex01 = tex00 + COMP; \
642 const GLchan *tex11 = tex10 + COMP; \
643 if (t == info->tmask) { \
644 tex10 -= info->tsize; \
645 tex11 -= info->tsize; \
646 } \
647 if (s == info->smask) { \
648 tex01 -= info->tbytesline; \
649 tex11 -= info->tbytesline; \
650 } \
651 DO_TEX; \
652 span->red += span->redStep; \
653 span->green += span->greenStep; \
654 span->blue += span->blueStep; \
655 span->alpha += span->alphaStep; \
656 tex_coord[0] += tex_step[0]; \
657 tex_coord[1] += tex_step[1]; \
658 tex_coord[2] += tex_step[2]; \
659 dest += 4; \
660 }
661
662 GLuint i;
663 GLfloat tex_coord[3], tex_step[3];
664 GLchan *dest = span->array->rgba[0];
665
666 const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
667 ctx->Texture._EnabledCoordUnits = 0;
668
669 tex_coord[0] = span->attrStart[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
670 tex_step[0] = span->attrStepX[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
671 tex_coord[1] = span->attrStart[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
672 tex_step[1] = span->attrStepX[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
673 /* span->attrStart[FRAG_ATTRIB_TEX0][2] only if 3D-texturing, here only 2D */
674 tex_coord[2] = span->attrStart[FRAG_ATTRIB_TEX0][3];
675 tex_step[2] = span->attrStepX[FRAG_ATTRIB_TEX0][3];
676
677 switch (info->filter) {
678 case GL_NEAREST:
679 switch (info->format) {
680 case MESA_FORMAT_RGB888:
681 switch (info->envmode) {
682 case GL_MODULATE:
683 SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
684 break;
685 case GL_DECAL:
686 case GL_REPLACE:
687 SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
688 break;
689 case GL_BLEND:
690 SPAN_NEAREST(NEAREST_RGB;BLEND,3);
691 break;
692 case GL_ADD:
693 SPAN_NEAREST(NEAREST_RGB;ADD,3);
694 break;
695 default:
696 _mesa_problem(ctx, "bad tex env mode (5) in SPAN_LINEAR");
697 return;
698 }
699 break;
700 case MESA_FORMAT_RGBA8888:
701 switch(info->envmode) {
702 case GL_MODULATE:
703 SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
704 break;
705 case GL_DECAL:
706 SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
707 break;
708 case GL_BLEND:
709 SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
710 break;
711 case GL_ADD:
712 SPAN_NEAREST(NEAREST_RGBA;ADD,4);
713 break;
714 case GL_REPLACE:
715 SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
716 break;
717 default:
718 _mesa_problem(ctx, "bad tex env mode (6) in SPAN_LINEAR");
719 return;
720 }
721 break;
722 }
723 break;
724
725 case GL_LINEAR:
726 switch (info->format) {
727 case MESA_FORMAT_RGB888:
728 switch (info->envmode) {
729 case GL_MODULATE:
730 SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
731 break;
732 case GL_DECAL:
733 case GL_REPLACE:
734 SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
735 break;
736 case GL_BLEND:
737 SPAN_LINEAR(LINEAR_RGB;BLEND,3);
738 break;
739 case GL_ADD:
740 SPAN_LINEAR(LINEAR_RGB;ADD,3);
741 break;
742 default:
743 _mesa_problem(ctx, "bad tex env mode (7) in SPAN_LINEAR");
744 return;
745 }
746 break;
747 case MESA_FORMAT_RGBA8888:
748 switch (info->envmode) {
749 case GL_MODULATE:
750 SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
751 break;
752 case GL_DECAL:
753 SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
754 break;
755 case GL_BLEND:
756 SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
757 break;
758 case GL_ADD:
759 SPAN_LINEAR(LINEAR_RGBA;ADD,4);
760 break;
761 case GL_REPLACE:
762 SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
763 break;
764 default:
765 _mesa_problem(ctx, "bad tex env mode (8) in SPAN_LINEAR");
766 return;
767 }
768 break;
769 }
770 break;
771 }
772
773 ASSERT(span->arrayMask & SPAN_RGBA);
774 _swrast_write_rgba_span(ctx, span);
775
776 #undef SPAN_NEAREST
777 #undef SPAN_LINEAR
778
779 /* restore state */
780 ctx->Texture._EnabledCoordUnits = texEnableSave;
781 }
782
783
784 /*
785 * Render an perspective corrected RGB/RGBA textured triangle.
786 * The Q (aka V in Mesa) coordinate must be zero such that the divide
787 * by interpolated Q/W comes out right.
788 *
789 */
790 #define NAME persp_textured_triangle
791 #define INTERP_Z 1
792 #define INTERP_RGB 1
793 #define INTERP_ALPHA 1
794 #define INTERP_ATTRIBS 1
795
796 #define SETUP_CODE \
797 struct persp_info info; \
798 const struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
799 const struct gl_texture_object *obj = \
800 ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
801 const struct gl_texture_image *texImg = \
802 obj->Image[0][obj->BaseLevel]; \
803 info.texture = (const GLchan *) texImg->Data; \
804 info.twidth_log2 = texImg->WidthLog2; \
805 info.smask = texImg->Width - 1; \
806 info.tmask = texImg->Height - 1; \
807 info.format = texImg->TexFormat; \
808 info.filter = obj->MinFilter; \
809 info.envmode = unit->EnvMode; \
810 info.er = 0; \
811 info.eg = 0; \
812 info.eb = 0; \
813 \
814 if (info.envmode == GL_BLEND) { \
815 /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
816 info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
817 info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
818 info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
819 info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
820 } \
821 if (!info.texture) { \
822 /* this shouldn't happen */ \
823 return; \
824 } \
825 \
826 switch (info.format) { \
827 case MESA_FORMAT_RGB888: \
828 info.tbytesline = texImg->Width * 3; \
829 break; \
830 case MESA_FORMAT_RGBA8888: \
831 info.tbytesline = texImg->Width * 4; \
832 break; \
833 default: \
834 _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\
835 return; \
836 } \
837 info.tsize = texImg->Height * info.tbytesline;
838
839 #define RENDER_SPAN( span ) \
840 span.interpMask &= ~SPAN_RGBA; \
841 span.arrayMask |= SPAN_RGBA; \
842 fast_persp_span(ctx, &span, &info);
843
844 #include "s_tritemp.h"
845
846 #endif /*CHAN_TYPE != GL_FLOAT*/
847
848
849
850 /*
851 * Render an RGBA triangle with arbitrary attributes.
852 */
853 #define NAME general_triangle
854 #define INTERP_Z 1
855 #define INTERP_RGB 1
856 #define INTERP_ALPHA 1
857 #define INTERP_ATTRIBS 1
858 #define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
859 #include "s_tritemp.h"
860
861
862
863
864 /*
865 * Special tri function for occlusion testing
866 */
867 #define NAME occlusion_zless_triangle
868 #define INTERP_Z 1
869 #define SETUP_CODE \
870 struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer; \
871 struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; \
872 ASSERT(ctx->Depth.Test); \
873 ASSERT(!ctx->Depth.Mask); \
874 ASSERT(ctx->Depth.Func == GL_LESS); \
875 if (!q) { \
876 return; \
877 }
878 #define RENDER_SPAN( span ) \
879 if (rb->Format == MESA_FORMAT_Z16) { \
880 GLuint i; \
881 const GLushort *zRow = (const GLushort *) \
882 rb->GetPointer(ctx, rb, span.x, span.y); \
883 for (i = 0; i < span.end; i++) { \
884 GLuint z = FixedToDepth(span.z); \
885 if (z < zRow[i]) { \
886 q->Result++; \
887 } \
888 span.z += span.zStep; \
889 } \
890 } \
891 else { \
892 GLuint i; \
893 const GLuint *zRow = (const GLuint *) \
894 rb->GetPointer(ctx, rb, span.x, span.y); \
895 for (i = 0; i < span.end; i++) { \
896 if ((GLuint)span.z < zRow[i]) { \
897 q->Result++; \
898 } \
899 span.z += span.zStep; \
900 } \
901 }
902 #include "s_tritemp.h"
903
904
905
906 static void
907 nodraw_triangle( struct gl_context *ctx,
908 const SWvertex *v0,
909 const SWvertex *v1,
910 const SWvertex *v2 )
911 {
912 (void) (ctx && v0 && v1 && v2);
913 }
914
915
916 /*
917 * This is used when separate specular color is enabled, but not
918 * texturing. We add the specular color to the primary color,
919 * draw the triangle, then restore the original primary color.
920 * Inefficient, but seldom needed.
921 */
922 void
923 _swrast_add_spec_terms_triangle(struct gl_context *ctx, const SWvertex *v0,
924 const SWvertex *v1, const SWvertex *v2)
925 {
926 SWvertex *ncv0 = (SWvertex *)v0; /* drop const qualifier */
927 SWvertex *ncv1 = (SWvertex *)v1;
928 SWvertex *ncv2 = (SWvertex *)v2;
929 GLfloat rSum, gSum, bSum;
930 GLchan cSave[3][4];
931
932 /* save original colors */
933 COPY_CHAN4( cSave[0], ncv0->color );
934 COPY_CHAN4( cSave[1], ncv1->color );
935 COPY_CHAN4( cSave[2], ncv2->color );
936 /* sum v0 */
937 rSum = CHAN_TO_FLOAT(ncv0->color[0]) + ncv0->attrib[FRAG_ATTRIB_COL1][0];
938 gSum = CHAN_TO_FLOAT(ncv0->color[1]) + ncv0->attrib[FRAG_ATTRIB_COL1][1];
939 bSum = CHAN_TO_FLOAT(ncv0->color[2]) + ncv0->attrib[FRAG_ATTRIB_COL1][2];
940 UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[0], rSum);
941 UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[1], gSum);
942 UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[2], bSum);
943 /* sum v1 */
944 rSum = CHAN_TO_FLOAT(ncv1->color[0]) + ncv1->attrib[FRAG_ATTRIB_COL1][0];
945 gSum = CHAN_TO_FLOAT(ncv1->color[1]) + ncv1->attrib[FRAG_ATTRIB_COL1][1];
946 bSum = CHAN_TO_FLOAT(ncv1->color[2]) + ncv1->attrib[FRAG_ATTRIB_COL1][2];
947 UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[0], rSum);
948 UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[1], gSum);
949 UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[2], bSum);
950 /* sum v2 */
951 rSum = CHAN_TO_FLOAT(ncv2->color[0]) + ncv2->attrib[FRAG_ATTRIB_COL1][0];
952 gSum = CHAN_TO_FLOAT(ncv2->color[1]) + ncv2->attrib[FRAG_ATTRIB_COL1][1];
953 bSum = CHAN_TO_FLOAT(ncv2->color[2]) + ncv2->attrib[FRAG_ATTRIB_COL1][2];
954 UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[0], rSum);
955 UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[1], gSum);
956 UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[2], bSum);
957 /* draw */
958 SWRAST_CONTEXT(ctx)->SpecTriangle( ctx, ncv0, ncv1, ncv2 );
959 /* restore original colors */
960 COPY_CHAN4( ncv0->color, cSave[0] );
961 COPY_CHAN4( ncv1->color, cSave[1] );
962 COPY_CHAN4( ncv2->color, cSave[2] );
963 }
964
965
966
967 #ifdef DEBUG
968
969 /* record the current triangle function name */
970 const char *_mesa_triFuncName = NULL;
971
972 #define USE(triFunc) \
973 do { \
974 _mesa_triFuncName = #triFunc; \
975 /*printf("%s\n", _mesa_triFuncName);*/ \
976 swrast->Triangle = triFunc; \
977 } while (0)
978
979 #else
980
981 #define USE(triFunc) swrast->Triangle = triFunc;
982
983 #endif
984
985
986
987
988 /*
989 * Determine which triangle rendering function to use given the current
990 * rendering context.
991 *
992 * Please update the summary flag _SWRAST_NEW_TRIANGLE if you add or
993 * remove tests to this code.
994 */
995 void
996 _swrast_choose_triangle( struct gl_context *ctx )
997 {
998 SWcontext *swrast = SWRAST_CONTEXT(ctx);
999
1000 if (ctx->Polygon.CullFlag &&
1001 ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
1002 USE(nodraw_triangle);
1003 return;
1004 }
1005
1006 if (ctx->RenderMode==GL_RENDER) {
1007
1008 if (ctx->Polygon.SmoothFlag) {
1009 _swrast_set_aa_triangle_function(ctx);
1010 ASSERT(swrast->Triangle);
1011 return;
1012 }
1013
1014 /* special case for occlusion testing */
1015 if (ctx->Query.CurrentOcclusionObject &&
1016 ctx->Depth.Test &&
1017 ctx->Depth.Mask == GL_FALSE &&
1018 ctx->Depth.Func == GL_LESS &&
1019 !ctx->Stencil._Enabled) {
1020 if (ctx->Color.ColorMask[0][0] == 0 &&
1021 ctx->Color.ColorMask[0][1] == 0 &&
1022 ctx->Color.ColorMask[0][2] == 0 &&
1023 ctx->Color.ColorMask[0][3] == 0) {
1024 USE(occlusion_zless_triangle);
1025 return;
1026 }
1027 }
1028
1029 /*
1030 * XXX should examine swrast->_ActiveAttribMask to determine what
1031 * needs to be interpolated.
1032 */
1033 if (ctx->Texture._EnabledCoordUnits ||
1034 ctx->FragmentProgram._Current ||
1035 ctx->ATIFragmentShader._Enabled ||
1036 _mesa_need_secondary_color(ctx) ||
1037 swrast->_FogEnabled) {
1038 /* Ugh, we do a _lot_ of tests to pick the best textured tri func */
1039 const struct gl_texture_object *texObj2D;
1040 const struct gl_texture_image *texImg;
1041 GLenum minFilter, magFilter, envMode;
1042 gl_format format;
1043 texObj2D = ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];
1044
1045 texImg = texObj2D ? texObj2D->Image[0][texObj2D->BaseLevel] : NULL;
1046 format = texImg ? texImg->TexFormat : MESA_FORMAT_NONE;
1047 minFilter = texObj2D ? texObj2D->MinFilter : GL_NONE;
1048 magFilter = texObj2D ? texObj2D->MagFilter : GL_NONE;
1049 envMode = ctx->Texture.Unit[0].EnvMode;
1050
1051 /* First see if we can use an optimized 2-D texture function */
1052 if (ctx->Texture._EnabledCoordUnits == 0x1
1053 && !ctx->FragmentProgram._Current
1054 && !ctx->ATIFragmentShader._Enabled
1055 && ctx->Texture._EnabledUnits == 0x1
1056 && ctx->Texture.Unit[0]._ReallyEnabled == TEXTURE_2D_BIT
1057 && texObj2D->WrapS == GL_REPEAT
1058 && texObj2D->WrapT == GL_REPEAT
1059 && texObj2D->_Swizzle == SWIZZLE_NOOP
1060 && texImg->_IsPowerOfTwo
1061 && texImg->Border == 0
1062 && texImg->Width == texImg->RowStride
1063 && (format == MESA_FORMAT_RGB888 || format == MESA_FORMAT_RGBA8888)
1064 && minFilter == magFilter
1065 && ctx->Light.Model.ColorControl == GL_SINGLE_COLOR
1066 && !swrast->_FogEnabled
1067 && ctx->Texture.Unit[0].EnvMode != GL_COMBINE_EXT
1068 && ctx->Texture.Unit[0].EnvMode != GL_COMBINE4_NV) {
1069 if (ctx->Hint.PerspectiveCorrection==GL_FASTEST) {
1070 if (minFilter == GL_NEAREST
1071 && format == MESA_FORMAT_RGB888
1072 && (envMode == GL_REPLACE || envMode == GL_DECAL)
1073 && ((swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)
1074 && ctx->Depth.Func == GL_LESS
1075 && ctx->Depth.Mask == GL_TRUE)
1076 || swrast->_RasterMask == TEXTURE_BIT)
1077 && ctx->Polygon.StippleFlag == GL_FALSE
1078 && ctx->DrawBuffer->Visual.depthBits <= 16) {
1079 if (swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)) {
1080 USE(simple_z_textured_triangle);
1081 }
1082 else {
1083 USE(simple_textured_triangle);
1084 }
1085 }
1086 else {
1087 #if CHAN_BITS != 8
1088 USE(general_triangle);
1089 #else
1090 if (format == MESA_FORMAT_RGBA8888 && !_mesa_little_endian()) {
1091 /* We only handle RGBA8888 correctly on little endian
1092 * in the optimized code above.
1093 */
1094 USE(general_triangle);
1095 }
1096 else {
1097 USE(affine_textured_triangle);
1098 }
1099 #endif
1100 }
1101 }
1102 else {
1103 #if CHAN_BITS != 8
1104 USE(general_triangle);
1105 #else
1106 USE(persp_textured_triangle);
1107 #endif
1108 }
1109 }
1110 else {
1111 /* general case textured triangles */
1112 USE(general_triangle);
1113 }
1114 }
1115 else {
1116 ASSERT(!swrast->_FogEnabled);
1117 ASSERT(!_mesa_need_secondary_color(ctx));
1118 if (ctx->Light.ShadeModel==GL_SMOOTH) {
1119 /* smooth shaded, no texturing, stippled or some raster ops */
1120 #if CHAN_BITS != 8
1121 USE(general_triangle);
1122 #else
1123 USE(smooth_rgba_triangle);
1124 #endif
1125 }
1126 else {
1127 /* flat shaded, no texturing, stippled or some raster ops */
1128 #if CHAN_BITS != 8
1129 USE(general_triangle);
1130 #else
1131 USE(flat_rgba_triangle);
1132 #endif
1133 }
1134 }
1135 }
1136 else if (ctx->RenderMode==GL_FEEDBACK) {
1137 USE(_swrast_feedback_triangle);
1138 }
1139 else {
1140 /* GL_SELECT mode */
1141 USE(_swrast_select_triangle);
1142 }
1143 }