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[mesa.git] / src / mesa / swrast / s_tritemp.h
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.5
4 *
5 * Copyright (C) 1999-2006 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 * Triangle Rasterizer Template
27 *
28 * This file is #include'd to generate custom triangle rasterizers.
29 *
30 * The following macros may be defined to indicate what auxillary information
31 * must be interpolated across the triangle:
32 * INTERP_Z - if defined, interpolate vertex Z values
33 * INTERP_W - if defined, interpolate vertex W values
34 * INTERP_FOG - if defined, interpolate fog values
35 * INTERP_RGB - if defined, interpolate RGB values
36 * INTERP_ALPHA - if defined, interpolate Alpha values (req's INTERP_RGB)
37 * INTERP_SPEC - if defined, interpolate specular RGB values
38 * INTERP_INDEX - if defined, interpolate color index values
39 * INTERP_INT_TEX - if defined, interpolate integer ST texcoords
40 * (fast, simple 2-D texture mapping)
41 * INTERP_TEX - if defined, interpolate set 0 float STRQ texcoords
42 * NOTE: OpenGL STRQ = Mesa STUV (R was taken for red)
43 * INTERP_MULTITEX - if defined, interpolate N units of STRQ texcoords
44 * INTERP_VARYING - if defined, interpolate M GLSL varyings
45 *
46 * When one can directly address pixels in the color buffer the following
47 * macros can be defined and used to compute pixel addresses during
48 * rasterization (see pRow):
49 * PIXEL_TYPE - the datatype of a pixel (GLubyte, GLushort, GLuint)
50 * BYTES_PER_ROW - number of bytes per row in the color buffer
51 * PIXEL_ADDRESS(X,Y) - returns the address of pixel at (X,Y) where
52 * Y==0 at bottom of screen and increases upward.
53 *
54 * Similarly, for direct depth buffer access, this type is used for depth
55 * buffer addressing:
56 * DEPTH_TYPE - either GLushort or GLuint
57 *
58 * Optionally, one may provide one-time setup code per triangle:
59 * SETUP_CODE - code which is to be executed once per triangle
60 * CLEANUP_CODE - code to execute at end of triangle
61 *
62 * The following macro MUST be defined:
63 * RENDER_SPAN(span) - code to write a span of pixels.
64 *
65 * This code was designed for the origin to be in the lower-left corner.
66 *
67 * Inspired by triangle rasterizer code written by Allen Akin. Thanks Allen!
68 *
69 *
70 * Some notes on rasterization accuracy:
71 *
72 * This code uses fixed point arithmetic (the GLfixed type) to iterate
73 * over the triangle edges and interpolate ancillary data (such as Z,
74 * color, secondary color, etc). The number of fractional bits in
75 * GLfixed and the value of SUB_PIXEL_BITS has a direct bearing on the
76 * accuracy of rasterization.
77 *
78 * If SUB_PIXEL_BITS=4 then we'll snap the vertices to the nearest
79 * 1/16 of a pixel. If we're walking up a long, nearly vertical edge
80 * (dx=1/16, dy=1024) we'll need 4 + 10 = 14 fractional bits in
81 * GLfixed to walk the edge without error. If the maximum viewport
82 * height is 4K pixels, then we'll need 4 + 12 = 16 fractional bits.
83 *
84 * Historically, Mesa has used 11 fractional bits in GLfixed, snaps
85 * vertices to 1/16 pixel and allowed a maximum viewport height of 2K
86 * pixels. 11 fractional bits is actually insufficient for accurately
87 * rasterizing some triangles. More recently, the maximum viewport
88 * height was increased to 4K pixels. Thus, Mesa should be using 16
89 * fractional bits in GLfixed. Unfortunately, there may be some issues
90 * with setting FIXED_FRAC_BITS=16, such as multiplication overflow.
91 * This will have to be examined in some detail...
92 *
93 * For now, if you find rasterization errors, particularly with tall,
94 * sliver triangles, try increasing FIXED_FRAC_BITS and/or decreasing
95 * SUB_PIXEL_BITS.
96 */
97
98 /*
99 * ColorTemp is used for intermediate color values.
100 */
101 #if CHAN_TYPE == GL_FLOAT
102 #define ColorTemp GLfloat
103 #else
104 #define ColorTemp GLint /* same as GLfixed */
105 #endif
106
107
108 /*
109 * Walk triangle edges with GLfixed or GLdouble
110 */
111 #if TRIANGLE_WALK_DOUBLE
112 #define GLinterp GLdouble
113 #define InterpToInt(X) ((GLint) (X))
114 #define INTERP_ONE 1.0
115 #else
116 #define GLinterp GLfixed
117 #define InterpToInt(X) FixedToInt(X)
118 #define INTERP_ONE FIXED_ONE
119 #endif
120
121
122 /*
123 * Either loop over all texture units, or just use unit zero.
124 */
125 #ifdef INTERP_MULTITEX
126 #define TEX_UNIT_LOOP(CODE) \
127 { \
128 GLuint u; \
129 for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { \
130 if (ctx->Texture._EnabledCoordUnits & (1 << u)) { \
131 const GLuint attr = FRAG_ATTRIB_TEX0 + u; \
132 (void) attr; \
133 CODE \
134 } \
135 } \
136 }
137 #define INTERP_TEX
138 #elif defined(INTERP_TEX)
139 #define TEX_UNIT_LOOP(CODE) \
140 { \
141 const GLuint u = 0; \
142 const GLuint attr = FRAG_ATTRIB_TEX0 + u; \
143 (void) attr; \
144 CODE \
145 }
146 #endif
147
148
149
150 #ifdef INTERP_VARYING
151
152 #define VARYING_LOOP(CODE) \
153 { \
154 GLuint iv, ic; \
155 for (iv = 0; iv < MAX_VARYING; iv++) { \
156 if (inputsUsed & FRAG_BIT_VAR(iv)) { \
157 GLuint attr = FRAG_ATTRIB_VAR0 + iv; \
158 (void) attr; \
159 for (ic = 0; ic < 4; ic++) { \
160 CODE \
161 } \
162 } \
163 } \
164 }
165 #endif
166
167
168
169 /*
170 * Some code we unfortunately need to prevent negative interpolated colors.
171 */
172 #ifndef CLAMP_INTERPOLANT
173 #define CLAMP_INTERPOLANT(CHANNEL, CHANNELSTEP, LEN) \
174 do { \
175 GLfixed endVal = span.CHANNEL + (LEN) * span.CHANNELSTEP; \
176 if (endVal < 0) { \
177 span.CHANNEL -= endVal; \
178 } \
179 if (span.CHANNEL < 0) { \
180 span.CHANNEL = 0; \
181 } \
182 } while (0)
183 #endif
184
185
186 static void NAME(GLcontext *ctx, const SWvertex *v0,
187 const SWvertex *v1,
188 const SWvertex *v2 )
189 {
190 typedef struct {
191 const SWvertex *v0, *v1; /* Y(v0) < Y(v1) */
192 #if TRIANGLE_WALK_DOUBLE
193 GLdouble dx; /* X(v1) - X(v0) */
194 GLdouble dy; /* Y(v1) - Y(v0) */
195 GLdouble dxdy; /* dx/dy */
196 GLdouble adjy; /* adjust from v[0]->fy to fsy, scaled */
197 GLdouble fsx; /* first sample point x coord */
198 GLdouble fsy;
199 GLdouble fx0; /*X of lower endpoint */
200 #else
201 GLfloat dx; /* X(v1) - X(v0) */
202 GLfloat dy; /* Y(v1) - Y(v0) */
203 GLfloat dxdy; /* dx/dy */
204 GLfixed fdxdy; /* dx/dy in fixed-point */
205 GLfloat adjy; /* adjust from v[0]->fy to fsy, scaled */
206 GLfixed fsx; /* first sample point x coord */
207 GLfixed fsy;
208 GLfixed fx0; /* fixed pt X of lower endpoint */
209 #endif
210 GLint lines; /* number of lines to be sampled on this edge */
211 } EdgeT;
212
213 #ifdef INTERP_Z
214 const GLint depthBits = ctx->DrawBuffer->Visual.depthBits;
215 const GLint fixedToDepthShift = depthBits <= 16 ? FIXED_SHIFT : 0;
216 const GLfloat maxDepth = ctx->DrawBuffer->_DepthMaxF;
217 #define FixedToDepth(F) ((F) >> fixedToDepthShift)
218 #endif
219 EdgeT eMaj, eTop, eBot;
220 GLfloat oneOverArea;
221 const SWvertex *vMin, *vMid, *vMax; /* Y(vMin)<=Y(vMid)<=Y(vMax) */
222 GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceSign;
223 #if !TRIANGLE_WALK_DOUBLE
224 const GLint snapMask = ~((FIXED_ONE / (1 << SUB_PIXEL_BITS)) - 1); /* for x/y coord snapping */
225 #endif
226 GLinterp vMin_fx, vMin_fy, vMid_fx, vMid_fy, vMax_fx, vMax_fy;
227 #ifdef INTERP_VARYING
228 const GLbitfield inputsUsed = ctx->FragmentProgram._Current ?
229 ctx->FragmentProgram._Current->Base.InputsRead : 0x0;
230 #endif
231
232 SWspan span;
233
234 INIT_SPAN(span, GL_POLYGON, 0, 0, 0);
235
236 #ifdef INTERP_Z
237 (void) fixedToDepthShift;
238 #endif
239
240 /*
241 printf("%s()\n", __FUNCTION__);
242 printf(" %g, %g, %g\n", v0->win[0], v0->win[1], v0->win[2]);
243 printf(" %g, %g, %g\n", v1->win[0], v1->win[1], v1->win[2]);
244 printf(" %g, %g, %g\n", v2->win[0], v2->win[1], v2->win[2]);
245 */
246 /*
247 ASSERT(v0->win[2] >= 0.0);
248 ASSERT(v1->win[2] >= 0.0);
249 ASSERT(v2->win[2] >= 0.0);
250 */
251 /* Compute fixed point x,y coords w/ half-pixel offsets and snapping.
252 * And find the order of the 3 vertices along the Y axis.
253 */
254 {
255 #if TRIANGLE_WALK_DOUBLE
256 const GLdouble fy0 = v0->win[1] - 0.5;
257 const GLdouble fy1 = v1->win[1] - 0.5;
258 const GLdouble fy2 = v2->win[1] - 0.5;
259 #else
260 const GLfixed fy0 = FloatToFixed(v0->win[1] - 0.5F) & snapMask;
261 const GLfixed fy1 = FloatToFixed(v1->win[1] - 0.5F) & snapMask;
262 const GLfixed fy2 = FloatToFixed(v2->win[1] - 0.5F) & snapMask;
263 #endif
264 if (fy0 <= fy1) {
265 if (fy1 <= fy2) {
266 /* y0 <= y1 <= y2 */
267 vMin = v0; vMid = v1; vMax = v2;
268 vMin_fy = fy0; vMid_fy = fy1; vMax_fy = fy2;
269 }
270 else if (fy2 <= fy0) {
271 /* y2 <= y0 <= y1 */
272 vMin = v2; vMid = v0; vMax = v1;
273 vMin_fy = fy2; vMid_fy = fy0; vMax_fy = fy1;
274 }
275 else {
276 /* y0 <= y2 <= y1 */
277 vMin = v0; vMid = v2; vMax = v1;
278 vMin_fy = fy0; vMid_fy = fy2; vMax_fy = fy1;
279 bf = -bf;
280 }
281 }
282 else {
283 if (fy0 <= fy2) {
284 /* y1 <= y0 <= y2 */
285 vMin = v1; vMid = v0; vMax = v2;
286 vMin_fy = fy1; vMid_fy = fy0; vMax_fy = fy2;
287 bf = -bf;
288 }
289 else if (fy2 <= fy1) {
290 /* y2 <= y1 <= y0 */
291 vMin = v2; vMid = v1; vMax = v0;
292 vMin_fy = fy2; vMid_fy = fy1; vMax_fy = fy0;
293 bf = -bf;
294 }
295 else {
296 /* y1 <= y2 <= y0 */
297 vMin = v1; vMid = v2; vMax = v0;
298 vMin_fy = fy1; vMid_fy = fy2; vMax_fy = fy0;
299 }
300 }
301
302 /* fixed point X coords */
303 #if TRIANGLE_WALK_DOUBLE
304 vMin_fx = vMin->win[0] + 0.5;
305 vMid_fx = vMid->win[0] + 0.5;
306 vMax_fx = vMax->win[0] + 0.5;
307 #else
308 vMin_fx = FloatToFixed(vMin->win[0] + 0.5F) & snapMask;
309 vMid_fx = FloatToFixed(vMid->win[0] + 0.5F) & snapMask;
310 vMax_fx = FloatToFixed(vMax->win[0] + 0.5F) & snapMask;
311 #endif
312 }
313
314 /* vertex/edge relationship */
315 eMaj.v0 = vMin; eMaj.v1 = vMax; /*TODO: .v1's not needed */
316 eTop.v0 = vMid; eTop.v1 = vMax;
317 eBot.v0 = vMin; eBot.v1 = vMid;
318
319 /* compute deltas for each edge: vertex[upper] - vertex[lower] */
320 #if TRIANGLE_WALK_DOUBLE
321 eMaj.dx = vMax_fx - vMin_fx;
322 eMaj.dy = vMax_fy - vMin_fy;
323 eTop.dx = vMax_fx - vMid_fx;
324 eTop.dy = vMax_fy - vMid_fy;
325 eBot.dx = vMid_fx - vMin_fx;
326 eBot.dy = vMid_fy - vMin_fy;
327 #else
328 eMaj.dx = FixedToFloat(vMax_fx - vMin_fx);
329 eMaj.dy = FixedToFloat(vMax_fy - vMin_fy);
330 eTop.dx = FixedToFloat(vMax_fx - vMid_fx);
331 eTop.dy = FixedToFloat(vMax_fy - vMid_fy);
332 eBot.dx = FixedToFloat(vMid_fx - vMin_fx);
333 eBot.dy = FixedToFloat(vMid_fy - vMin_fy);
334 #endif
335
336 /* compute area, oneOverArea and perform backface culling */
337 {
338 #if TRIANGLE_WALK_DOUBLE
339 const GLdouble area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
340 #else
341 const GLfloat area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
342 #endif
343 /* Do backface culling */
344 if (area * bf < 0.0)
345 return;
346
347 if (IS_INF_OR_NAN(area) || area == 0.0F)
348 return;
349
350 oneOverArea = 1.0F / area;
351 }
352
353
354 span.facing = ctx->_Facing; /* for 2-sided stencil test */
355
356 /* Edge setup. For a triangle strip these could be reused... */
357 {
358 #if TRIANGLE_WALK_DOUBLE
359 eMaj.fsy = CEILF(vMin_fy);
360 eMaj.lines = (GLint) CEILF(vMax_fy - eMaj.fsy);
361 #else
362 eMaj.fsy = FixedCeil(vMin_fy);
363 eMaj.lines = FixedToInt(FixedCeil(vMax_fy - eMaj.fsy));
364 #endif
365 if (eMaj.lines > 0) {
366 eMaj.dxdy = eMaj.dx / eMaj.dy;
367 #if TRIANGLE_WALK_DOUBLE
368 eMaj.adjy = (eMaj.fsy - vMin_fy) * FIXED_SCALE; /* SCALED! */
369 eMaj.fx0 = vMin_fx;
370 eMaj.fsx = eMaj.fx0 + (eMaj.adjy * eMaj.dxdy) / (GLdouble) FIXED_SCALE;
371 #else
372 eMaj.fdxdy = SignedFloatToFixed(eMaj.dxdy);
373 eMaj.adjy = (GLfloat) (eMaj.fsy - vMin_fy); /* SCALED! */
374 eMaj.fx0 = vMin_fx;
375 eMaj.fsx = eMaj.fx0 + (GLfixed) (eMaj.adjy * eMaj.dxdy);
376 #endif
377 }
378 else {
379 return; /*CULLED*/
380 }
381
382 #if TRIANGLE_WALK_DOUBLE
383 eTop.fsy = CEILF(vMid_fy);
384 eTop.lines = (GLint) CEILF(vMax_fy - eTop.fsy);
385 #else
386 eTop.fsy = FixedCeil(vMid_fy);
387 eTop.lines = FixedToInt(FixedCeil(vMax_fy - eTop.fsy));
388 #endif
389 if (eTop.lines > 0) {
390 eTop.dxdy = eTop.dx / eTop.dy;
391 #if TRIANGLE_WALK_DOUBLE
392 eTop.adjy = (eTop.fsy - vMid_fy) * FIXED_SCALE; /* SCALED! */
393 eTop.fx0 = vMid_fx;
394 eTop.fsx = eTop.fx0 + (eTop.adjy * eTop.dxdy) / (GLdouble) FIXED_SCALE;
395 #else
396 eTop.fdxdy = SignedFloatToFixed(eTop.dxdy);
397 eTop.adjy = (GLfloat) (eTop.fsy - vMid_fy); /* SCALED! */
398 eTop.fx0 = vMid_fx;
399 eTop.fsx = eTop.fx0 + (GLfixed) (eTop.adjy * eTop.dxdy);
400 #endif
401 }
402
403 #if TRIANGLE_WALK_DOUBLE
404 eBot.fsy = CEILF(vMin_fy);
405 eBot.lines = (GLint) CEILF(vMid_fy - eBot.fsy);
406 #else
407 eBot.fsy = FixedCeil(vMin_fy);
408 eBot.lines = FixedToInt(FixedCeil(vMid_fy - eBot.fsy));
409 #endif
410 if (eBot.lines > 0) {
411 eBot.dxdy = eBot.dx / eBot.dy;
412 #if TRIANGLE_WALK_DOUBLE
413 eBot.adjy = (eBot.fsy - vMin_fy) * FIXED_SCALE; /* SCALED! */
414 eBot.fx0 = vMin_fx;
415 eBot.fsx = eBot.fx0 + (eBot.adjy * eBot.dxdy) / (GLdouble) FIXED_SCALE;
416 #else
417 eBot.fdxdy = SignedFloatToFixed(eBot.dxdy);
418 eBot.adjy = (GLfloat) (eBot.fsy - vMin_fy); /* SCALED! */
419 eBot.fx0 = vMin_fx;
420 eBot.fsx = eBot.fx0 + (GLfixed) (eBot.adjy * eBot.dxdy);
421 #endif
422 }
423 }
424
425 /*
426 * Conceptually, we view a triangle as two subtriangles
427 * separated by a perfectly horizontal line. The edge that is
428 * intersected by this line is one with maximal absolute dy; we
429 * call it a ``major'' edge. The other two edges are the
430 * ``top'' edge (for the upper subtriangle) and the ``bottom''
431 * edge (for the lower subtriangle). If either of these two
432 * edges is horizontal or very close to horizontal, the
433 * corresponding subtriangle might cover zero sample points;
434 * we take care to handle such cases, for performance as well
435 * as correctness.
436 *
437 * By stepping rasterization parameters along the major edge,
438 * we can avoid recomputing them at the discontinuity where
439 * the top and bottom edges meet. However, this forces us to
440 * be able to scan both left-to-right and right-to-left.
441 * Also, we must determine whether the major edge is at the
442 * left or right side of the triangle. We do this by
443 * computing the magnitude of the cross-product of the major
444 * and top edges. Since this magnitude depends on the sine of
445 * the angle between the two edges, its sign tells us whether
446 * we turn to the left or to the right when travelling along
447 * the major edge to the top edge, and from this we infer
448 * whether the major edge is on the left or the right.
449 *
450 * Serendipitously, this cross-product magnitude is also a
451 * value we need to compute the iteration parameter
452 * derivatives for the triangle, and it can be used to perform
453 * backface culling because its sign tells us whether the
454 * triangle is clockwise or counterclockwise. In this code we
455 * refer to it as ``area'' because it's also proportional to
456 * the pixel area of the triangle.
457 */
458
459 {
460 GLint scan_from_left_to_right; /* true if scanning left-to-right */
461 #ifdef INTERP_INDEX
462 GLfloat didx, didy;
463 #endif
464
465 /*
466 * Execute user-supplied setup code
467 */
468 #ifdef SETUP_CODE
469 SETUP_CODE
470 #endif
471
472 scan_from_left_to_right = (oneOverArea < 0.0F);
473
474
475 /* compute d?/dx and d?/dy derivatives */
476 #ifdef INTERP_Z
477 span.interpMask |= SPAN_Z;
478 {
479 GLfloat eMaj_dz = vMax->win[2] - vMin->win[2];
480 GLfloat eBot_dz = vMid->win[2] - vMin->win[2];
481 span.attrStepX[FRAG_ATTRIB_WPOS][2] = oneOverArea * (eMaj_dz * eBot.dy - eMaj.dy * eBot_dz);
482 if (span.attrStepX[FRAG_ATTRIB_WPOS][2] > maxDepth || span.attrStepX[FRAG_ATTRIB_WPOS][2] < -maxDepth) {
483 /* probably a sliver triangle */
484 span.attrStepX[FRAG_ATTRIB_WPOS][2] = 0.0;
485 span.attrStepY[FRAG_ATTRIB_WPOS][2] = 0.0;
486 }
487 else {
488 span.attrStepY[FRAG_ATTRIB_WPOS][2] = oneOverArea * (eMaj.dx * eBot_dz - eMaj_dz * eBot.dx);
489 }
490 if (depthBits <= 16)
491 span.zStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_WPOS][2]);
492 else
493 span.zStep = (GLint) span.attrStepX[FRAG_ATTRIB_WPOS][2];
494 }
495 #endif
496 #ifdef INTERP_W
497 span.interpMask |= SPAN_W;
498 {
499 const GLfloat eMaj_dw = vMax->win[3] - vMin->win[3];
500 const GLfloat eBot_dw = vMid->win[3] - vMin->win[3];
501 span.attrStepX[FRAG_ATTRIB_WPOS][3] = oneOverArea * (eMaj_dw * eBot.dy - eMaj.dy * eBot_dw);
502 span.attrStepY[FRAG_ATTRIB_WPOS][3] = oneOverArea * (eMaj.dx * eBot_dw - eMaj_dw * eBot.dx);
503 }
504 #endif
505 #ifdef INTERP_FOG
506 span.interpMask |= SPAN_FOG;
507 {
508 # ifdef INTERP_W
509 const GLfloat wMax = vMax->win[3], wMin = vMin->win[3], wMid = vMid->win[3];
510 const GLfloat eMaj_dfog = vMax->fog * wMax - vMin->fog * wMin;
511 const GLfloat eBot_dfog = vMid->fog * wMid - vMin->fog * wMin;
512 # else
513 const GLfloat eMaj_dfog = vMax->fog - vMin->fog;
514 const GLfloat eBot_dfog = vMid->fog - vMin->fog;
515 # endif
516 span.attrStepX[FRAG_ATTRIB_FOGC][0] = oneOverArea * (eMaj_dfog * eBot.dy - eMaj.dy * eBot_dfog);
517 span.attrStepY[FRAG_ATTRIB_FOGC][0] = oneOverArea * (eMaj.dx * eBot_dfog - eMaj_dfog * eBot.dx);
518 }
519 #endif
520 #ifdef INTERP_RGB
521 span.interpMask |= SPAN_RGBA;
522 if (ctx->Light.ShadeModel == GL_SMOOTH) {
523 GLfloat eMaj_dr = (GLfloat) ((ColorTemp) vMax->color[RCOMP] - (ColorTemp) vMin->color[RCOMP]);
524 GLfloat eBot_dr = (GLfloat) ((ColorTemp) vMid->color[RCOMP] - (ColorTemp) vMin->color[RCOMP]);
525 GLfloat eMaj_dg = (GLfloat) ((ColorTemp) vMax->color[GCOMP] - (ColorTemp) vMin->color[GCOMP]);
526 GLfloat eBot_dg = (GLfloat) ((ColorTemp) vMid->color[GCOMP] - (ColorTemp) vMin->color[GCOMP]);
527 GLfloat eMaj_db = (GLfloat) ((ColorTemp) vMax->color[BCOMP] - (ColorTemp) vMin->color[BCOMP]);
528 GLfloat eBot_db = (GLfloat) ((ColorTemp) vMid->color[BCOMP] - (ColorTemp) vMin->color[BCOMP]);
529 # ifdef INTERP_ALPHA
530 GLfloat eMaj_da = (GLfloat) ((ColorTemp) vMax->color[ACOMP] - (ColorTemp) vMin->color[ACOMP]);
531 GLfloat eBot_da = (GLfloat) ((ColorTemp) vMid->color[ACOMP] - (ColorTemp) vMin->color[ACOMP]);
532 # endif
533 span.attrStepX[FRAG_ATTRIB_COL0][0] = oneOverArea * (eMaj_dr * eBot.dy - eMaj.dy * eBot_dr);
534 span.attrStepY[FRAG_ATTRIB_COL0][0] = oneOverArea * (eMaj.dx * eBot_dr - eMaj_dr * eBot.dx);
535 span.attrStepX[FRAG_ATTRIB_COL0][1] = oneOverArea * (eMaj_dg * eBot.dy - eMaj.dy * eBot_dg);
536 span.attrStepY[FRAG_ATTRIB_COL0][1] = oneOverArea * (eMaj.dx * eBot_dg - eMaj_dg * eBot.dx);
537 span.attrStepX[FRAG_ATTRIB_COL0][2] = oneOverArea * (eMaj_db * eBot.dy - eMaj.dy * eBot_db);
538 span.attrStepY[FRAG_ATTRIB_COL0][2] = oneOverArea * (eMaj.dx * eBot_db - eMaj_db * eBot.dx);
539 # if CHAN_TYPE == GL_FLOAT
540 span.redStep = span.attrStepX[FRAG_ATTRIB_COL0][0];
541 span.greenStep = span.attrStepX[FRAG_ATTRIB_COL0][1];
542 span.blueStep = span.attrStepX[FRAG_ATTRIB_COL0][2];
543 # else
544 span.redStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL0][0]);
545 span.greenStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL0][1]);
546 span.blueStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL0][2]);
547 # endif /* GL_FLOAT */
548 # ifdef INTERP_ALPHA
549 span.attrStepX[FRAG_ATTRIB_COL0][3] = oneOverArea * (eMaj_da * eBot.dy - eMaj.dy * eBot_da);
550 span.attrStepX[FRAG_ATTRIB_COL0][3] = oneOverArea * (eMaj.dx * eBot_da - eMaj_da * eBot.dx);
551 # if CHAN_TYPE == GL_FLOAT
552 span.alphaStep = span.attrStepX[FRAG_ATTRIB_COL0][3];
553 # else
554 span.alphaStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL0][3]);
555 # endif /* GL_FLOAT */
556 # endif /* INTERP_ALPHA */
557 }
558 else {
559 ASSERT(ctx->Light.ShadeModel == GL_FLAT);
560 span.interpMask |= SPAN_FLAT;
561 span.attrStepX[FRAG_ATTRIB_COL0][0] = span.attrStepY[FRAG_ATTRIB_COL0][0] = 0.0F;
562 span.attrStepX[FRAG_ATTRIB_COL0][1] = span.attrStepY[FRAG_ATTRIB_COL0][1] = 0.0F;
563 span.attrStepX[FRAG_ATTRIB_COL0][2] = span.attrStepY[FRAG_ATTRIB_COL0][2] = 0.0F;
564 # if CHAN_TYPE == GL_FLOAT
565 span.redStep = 0.0F;
566 span.greenStep = 0.0F;
567 span.blueStep = 0.0F;
568 # else
569 span.redStep = 0;
570 span.greenStep = 0;
571 span.blueStep = 0;
572 # endif /* GL_FLOAT */
573 # ifdef INTERP_ALPHA
574 span.attrStepX[FRAG_ATTRIB_COL0][3] = span.attrStepX[FRAG_ATTRIB_COL0][3] = 0.0F;
575 # if CHAN_TYPE == GL_FLOAT
576 span.alphaStep = 0.0F;
577 # else
578 span.alphaStep = 0;
579 # endif /* GL_FLOAT */
580 # endif
581 }
582 #endif /* INTERP_RGB */
583 #ifdef INTERP_SPEC
584 span.interpMask |= SPAN_SPEC;
585 if (ctx->Light.ShadeModel == GL_SMOOTH) {
586 GLfloat eMaj_dsr = (GLfloat) ((ColorTemp) vMax->specular[RCOMP] - (ColorTemp) vMin->specular[RCOMP]);
587 GLfloat eBot_dsr = (GLfloat) ((ColorTemp) vMid->specular[RCOMP] - (ColorTemp) vMin->specular[RCOMP]);
588 GLfloat eMaj_dsg = (GLfloat) ((ColorTemp) vMax->specular[GCOMP] - (ColorTemp) vMin->specular[GCOMP]);
589 GLfloat eBot_dsg = (GLfloat) ((ColorTemp) vMid->specular[GCOMP] - (ColorTemp) vMin->specular[GCOMP]);
590 GLfloat eMaj_dsb = (GLfloat) ((ColorTemp) vMax->specular[BCOMP] - (ColorTemp) vMin->specular[BCOMP]);
591 GLfloat eBot_dsb = (GLfloat) ((ColorTemp) vMid->specular[BCOMP] - (ColorTemp) vMin->specular[BCOMP]);
592 span.attrStepX[FRAG_ATTRIB_COL1][0] = oneOverArea * (eMaj_dsr * eBot.dy - eMaj.dy * eBot_dsr);
593 span.attrStepY[FRAG_ATTRIB_COL1][0] = oneOverArea * (eMaj.dx * eBot_dsr - eMaj_dsr * eBot.dx);
594 span.attrStepX[FRAG_ATTRIB_COL1][1] = oneOverArea * (eMaj_dsg * eBot.dy - eMaj.dy * eBot_dsg);
595 span.attrStepY[FRAG_ATTRIB_COL1][1] = oneOverArea * (eMaj.dx * eBot_dsg - eMaj_dsg * eBot.dx);
596 span.attrStepX[FRAG_ATTRIB_COL1][2] = oneOverArea * (eMaj_dsb * eBot.dy - eMaj.dy * eBot_dsb);
597 span.attrStepY[FRAG_ATTRIB_COL1][2] = oneOverArea * (eMaj.dx * eBot_dsb - eMaj_dsb * eBot.dx);
598 # if CHAN_TYPE == GL_FLOAT
599 span.specRedStep = span.attrStep[FRAG_ATTRIB_COL1][0];
600 span.specGreenStep = span.dsgdx;
601 span.specBlueStep = span.dsbdx;
602 # else
603 span.specRedStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL1][0]);
604 span.specGreenStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL1][1]);
605 span.specBlueStep = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL1][2]);
606 # endif
607 }
608 else {
609 span.attrStepX[FRAG_ATTRIB_COL1][0] = span.attrStepY[FRAG_ATTRIB_COL1][0] = 0.0F;
610 span.attrStepX[FRAG_ATTRIB_COL1][1] = span.attrStepY[FRAG_ATTRIB_COL1][1] = 0.0F;
611 span.attrStepX[FRAG_ATTRIB_COL1][2] = span.attrStepY[FRAG_ATTRIB_COL1][2] = 0.0F;
612 # if CHAN_TYPE == GL_FLOAT
613 span.specRedStep = 0.0F;
614 span.specGreenStep = 0.0F;
615 span.specBlueStep = 0.0F;
616 # else
617 span.specRedStep = 0;
618 span.specGreenStep = 0;
619 span.specBlueStep = 0;
620 # endif
621 }
622 #endif /* INTERP_SPEC */
623 #ifdef INTERP_INDEX
624 span.interpMask |= SPAN_INDEX;
625 if (ctx->Light.ShadeModel == GL_SMOOTH) {
626 GLfloat eMaj_di = vMax->index - vMin->index;
627 GLfloat eBot_di = vMid->index - vMin->index;
628 didx = oneOverArea * (eMaj_di * eBot.dy - eMaj.dy * eBot_di);
629 didy = oneOverArea * (eMaj.dx * eBot_di - eMaj_di * eBot.dx);
630 span.indexStep = SignedFloatToFixed(didx);
631 }
632 else {
633 span.interpMask |= SPAN_FLAT;
634 didx = didy = 0.0F;
635 span.indexStep = 0;
636 }
637 #endif
638 #ifdef INTERP_INT_TEX
639 span.interpMask |= SPAN_INT_TEXTURE;
640 {
641 GLfloat eMaj_ds = (vMax->texcoord[0][0] - vMin->texcoord[0][0]) * S_SCALE;
642 GLfloat eBot_ds = (vMid->texcoord[0][0] - vMin->texcoord[0][0]) * S_SCALE;
643 GLfloat eMaj_dt = (vMax->texcoord[0][1] - vMin->texcoord[0][1]) * T_SCALE;
644 GLfloat eBot_dt = (vMid->texcoord[0][1] - vMin->texcoord[0][1]) * T_SCALE;
645 span.attrStepX[FRAG_ATTRIB_TEX0][0] = oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
646 span.attrStepY[FRAG_ATTRIB_TEX0][0] = oneOverArea * (eMaj.dx * eBot_ds - eMaj_ds * eBot.dx);
647 span.attrStepX[FRAG_ATTRIB_TEX0][1] = oneOverArea * (eMaj_dt * eBot.dy - eMaj.dy * eBot_dt);
648 span.attrStepY[FRAG_ATTRIB_TEX0][1] = oneOverArea * (eMaj.dx * eBot_dt - eMaj_dt * eBot.dx);
649 span.intTexStep[0] = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_TEX0][0]);
650 span.intTexStep[1] = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_TEX0][1]);
651 }
652 #endif
653 #ifdef INTERP_TEX
654 span.interpMask |= SPAN_TEXTURE;
655 {
656 /* win[3] is 1/W */
657 const GLfloat wMax = vMax->win[3], wMin = vMin->win[3], wMid = vMid->win[3];
658 TEX_UNIT_LOOP(
659 GLfloat eMaj_ds = vMax->texcoord[u][0] * wMax - vMin->texcoord[u][0] * wMin;
660 GLfloat eBot_ds = vMid->texcoord[u][0] * wMid - vMin->texcoord[u][0] * wMin;
661 GLfloat eMaj_dt = vMax->texcoord[u][1] * wMax - vMin->texcoord[u][1] * wMin;
662 GLfloat eBot_dt = vMid->texcoord[u][1] * wMid - vMin->texcoord[u][1] * wMin;
663 GLfloat eMaj_du = vMax->texcoord[u][2] * wMax - vMin->texcoord[u][2] * wMin;
664 GLfloat eBot_du = vMid->texcoord[u][2] * wMid - vMin->texcoord[u][2] * wMin;
665 GLfloat eMaj_dv = vMax->texcoord[u][3] * wMax - vMin->texcoord[u][3] * wMin;
666 GLfloat eBot_dv = vMid->texcoord[u][3] * wMid - vMin->texcoord[u][3] * wMin;
667 span.attrStepX[attr][0] = oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
668 span.attrStepY[attr][0] = oneOverArea * (eMaj.dx * eBot_ds - eMaj_ds * eBot.dx);
669 span.attrStepX[attr][1] = oneOverArea * (eMaj_dt * eBot.dy - eMaj.dy * eBot_dt);
670 span.attrStepY[attr][1] = oneOverArea * (eMaj.dx * eBot_dt - eMaj_dt * eBot.dx);
671 span.attrStepX[attr][2] = oneOverArea * (eMaj_du * eBot.dy - eMaj.dy * eBot_du);
672 span.attrStepY[attr][2] = oneOverArea * (eMaj.dx * eBot_du - eMaj_du * eBot.dx);
673 span.attrStepX[attr][3] = oneOverArea * (eMaj_dv * eBot.dy - eMaj.dy * eBot_dv);
674 span.attrStepY[attr][3] = oneOverArea * (eMaj.dx * eBot_dv - eMaj_dv * eBot.dx);
675 )
676 }
677 #endif
678 #ifdef INTERP_VARYING
679 span.interpMask |= SPAN_VARYING;
680 {
681 /* win[3] is 1/W */
682 const GLfloat wMax = vMax->win[3], wMin = vMin->win[3], wMid = vMid->win[3];
683 VARYING_LOOP(
684 GLfloat eMaj_dvar = vMax->varying[iv][ic] * wMax - vMin->varying[iv][ic] * wMin;
685 GLfloat eBot_dvar = vMid->varying[iv][ic] * wMid - vMin->varying[iv][ic] * wMin;
686 span.attrStepX[attr][ic] = oneOverArea * (eMaj_dvar * eBot.dy - eMaj.dy * eBot_dvar);
687 span.attrStepY[attr][ic] = oneOverArea * (eMaj.dx * eBot_dvar - eMaj_dvar * eBot.dx);
688 )
689 }
690 #endif
691
692 /*
693 * We always sample at pixel centers. However, we avoid
694 * explicit half-pixel offsets in this code by incorporating
695 * the proper offset in each of x and y during the
696 * transformation to window coordinates.
697 *
698 * We also apply the usual rasterization rules to prevent
699 * cracks and overlaps. A pixel is considered inside a
700 * subtriangle if it meets all of four conditions: it is on or
701 * to the right of the left edge, strictly to the left of the
702 * right edge, on or below the top edge, and strictly above
703 * the bottom edge. (Some edges may be degenerate.)
704 *
705 * The following discussion assumes left-to-right scanning
706 * (that is, the major edge is on the left); the right-to-left
707 * case is a straightforward variation.
708 *
709 * We start by finding the half-integral y coordinate that is
710 * at or below the top of the triangle. This gives us the
711 * first scan line that could possibly contain pixels that are
712 * inside the triangle.
713 *
714 * Next we creep down the major edge until we reach that y,
715 * and compute the corresponding x coordinate on the edge.
716 * Then we find the half-integral x that lies on or just
717 * inside the edge. This is the first pixel that might lie in
718 * the interior of the triangle. (We won't know for sure
719 * until we check the other edges.)
720 *
721 * As we rasterize the triangle, we'll step down the major
722 * edge. For each step in y, we'll move an integer number
723 * of steps in x. There are two possible x step sizes, which
724 * we'll call the ``inner'' step (guaranteed to land on the
725 * edge or inside it) and the ``outer'' step (guaranteed to
726 * land on the edge or outside it). The inner and outer steps
727 * differ by one. During rasterization we maintain an error
728 * term that indicates our distance from the true edge, and
729 * select either the inner step or the outer step, whichever
730 * gets us to the first pixel that falls inside the triangle.
731 *
732 * All parameters (z, red, etc.) as well as the buffer
733 * addresses for color and z have inner and outer step values,
734 * so that we can increment them appropriately. This method
735 * eliminates the need to adjust parameters by creeping a
736 * sub-pixel amount into the triangle at each scanline.
737 */
738
739 {
740 GLint subTriangle;
741 GLinterp fxLeftEdge = 0, fxRightEdge = 0;
742 GLinterp fdxLeftEdge = 0, fdxRightEdge = 0;
743 GLinterp fError = 0, fdError = 0;
744 #ifdef PIXEL_ADDRESS
745 PIXEL_TYPE *pRow = NULL;
746 GLint dPRowOuter = 0, dPRowInner; /* offset in bytes */
747 #endif
748 #ifdef INTERP_Z
749 # ifdef DEPTH_TYPE
750 struct gl_renderbuffer *zrb
751 = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
752 DEPTH_TYPE *zRow = NULL;
753 GLint dZRowOuter = 0, dZRowInner; /* offset in bytes */
754 # endif
755 GLuint zLeft = 0;
756 GLfixed fdzOuter = 0, fdzInner;
757 #endif
758 #ifdef INTERP_W
759 GLfloat wLeft = 0, dwOuter = 0, dwInner;
760 #endif
761 #ifdef INTERP_FOG
762 GLfloat fogLeft = 0, dfogOuter = 0, dfogInner;
763 #endif
764 #ifdef INTERP_RGB
765 ColorTemp rLeft = 0, fdrOuter = 0, fdrInner;
766 ColorTemp gLeft = 0, fdgOuter = 0, fdgInner;
767 ColorTemp bLeft = 0, fdbOuter = 0, fdbInner;
768 #endif
769 #ifdef INTERP_ALPHA
770 ColorTemp aLeft = 0, fdaOuter = 0, fdaInner;
771 #endif
772 #ifdef INTERP_SPEC
773 ColorTemp srLeft=0, dsrOuter=0, dsrInner;
774 ColorTemp sgLeft=0, dsgOuter=0, dsgInner;
775 ColorTemp sbLeft=0, dsbOuter=0, dsbInner;
776 #endif
777 #ifdef INTERP_INDEX
778 GLfixed iLeft=0, diOuter=0, diInner;
779 #endif
780 #ifdef INTERP_INT_TEX
781 GLfixed sLeft=0, dsOuter=0, dsInner;
782 GLfixed tLeft=0, dtOuter=0, dtInner;
783 #endif
784 #ifdef INTERP_TEX
785 GLfloat sLeft[MAX_TEXTURE_COORD_UNITS];
786 GLfloat tLeft[MAX_TEXTURE_COORD_UNITS];
787 GLfloat uLeft[MAX_TEXTURE_COORD_UNITS];
788 GLfloat vLeft[MAX_TEXTURE_COORD_UNITS];
789 GLfloat dsOuter[MAX_TEXTURE_COORD_UNITS], dsInner[MAX_TEXTURE_COORD_UNITS];
790 GLfloat dtOuter[MAX_TEXTURE_COORD_UNITS], dtInner[MAX_TEXTURE_COORD_UNITS];
791 GLfloat duOuter[MAX_TEXTURE_COORD_UNITS], duInner[MAX_TEXTURE_COORD_UNITS];
792 GLfloat dvOuter[MAX_TEXTURE_COORD_UNITS], dvInner[MAX_TEXTURE_COORD_UNITS];
793 #endif
794 #ifdef INTERP_VARYING
795 GLfloat varLeft[MAX_VARYING][4];
796 GLfloat dvarOuter[MAX_VARYING][4];
797 GLfloat dvarInner[MAX_VARYING][4];
798 #endif
799
800 for (subTriangle=0; subTriangle<=1; subTriangle++) {
801 EdgeT *eLeft, *eRight;
802 int setupLeft, setupRight;
803 int lines;
804
805 if (subTriangle==0) {
806 /* bottom half */
807 if (scan_from_left_to_right) {
808 eLeft = &eMaj;
809 eRight = &eBot;
810 lines = eRight->lines;
811 setupLeft = 1;
812 setupRight = 1;
813 }
814 else {
815 eLeft = &eBot;
816 eRight = &eMaj;
817 lines = eLeft->lines;
818 setupLeft = 1;
819 setupRight = 1;
820 }
821 }
822 else {
823 /* top half */
824 if (scan_from_left_to_right) {
825 eLeft = &eMaj;
826 eRight = &eTop;
827 lines = eRight->lines;
828 setupLeft = 0;
829 setupRight = 1;
830 }
831 else {
832 eLeft = &eTop;
833 eRight = &eMaj;
834 lines = eLeft->lines;
835 setupLeft = 1;
836 setupRight = 0;
837 }
838 if (lines == 0)
839 return;
840 }
841
842 if (setupLeft && eLeft->lines > 0) {
843 const SWvertex *vLower = eLeft->v0;
844 #if TRIANGLE_WALK_DOUBLE
845 const GLdouble fsy = eLeft->fsy;
846 const GLdouble fsx = eLeft->fsx;
847 const GLdouble fx = CEILF(fsx);
848 const GLdouble adjx = (fx - eLeft->fx0) * FIXED_SCALE; /* SCALED! */
849 #else
850 const GLfixed fsy = eLeft->fsy;
851 const GLfixed fsx = eLeft->fsx; /* no fractional part */
852 const GLfixed fx = FixedCeil(fsx); /* no fractional part */
853 const GLfixed adjx = (GLinterp) (fx - eLeft->fx0); /* SCALED! */
854 #endif
855 const GLinterp adjy = (GLinterp) eLeft->adjy; /* SCALED! */
856 GLint idxOuter;
857 #if TRIANGLE_WALK_DOUBLE
858 GLdouble dxOuter;
859
860 fError = fx - fsx - 1.0;
861 fxLeftEdge = fsx;
862 fdxLeftEdge = eLeft->dxdy;
863 dxOuter = FLOORF(fdxLeftEdge);
864 fdError = dxOuter - fdxLeftEdge + 1.0;
865 idxOuter = (GLint) dxOuter;
866 span.y = (GLint) fsy;
867 #else
868 GLfloat dxOuter;
869 GLfixed fdxOuter;
870
871 fError = fx - fsx - FIXED_ONE;
872 fxLeftEdge = fsx - FIXED_EPSILON;
873 fdxLeftEdge = eLeft->fdxdy;
874 fdxOuter = FixedFloor(fdxLeftEdge - FIXED_EPSILON);
875 fdError = fdxOuter - fdxLeftEdge + FIXED_ONE;
876 idxOuter = FixedToInt(fdxOuter);
877 dxOuter = (GLfloat) idxOuter;
878 span.y = FixedToInt(fsy);
879 #endif
880
881 /* silence warnings on some compilers */
882 (void) dxOuter;
883 (void) adjx;
884 (void) adjy;
885 (void) vLower;
886
887 #ifdef PIXEL_ADDRESS
888 {
889 pRow = (PIXEL_TYPE *) PIXEL_ADDRESS(InterpToInt(fxLeftEdge), span.y);
890 dPRowOuter = -((int)BYTES_PER_ROW) + idxOuter * sizeof(PIXEL_TYPE);
891 /* negative because Y=0 at bottom and increases upward */
892 }
893 #endif
894 /*
895 * Now we need the set of parameter (z, color, etc.) values at
896 * the point (fx, fsy). This gives us properly-sampled parameter
897 * values that we can step from pixel to pixel. Furthermore,
898 * although we might have intermediate results that overflow
899 * the normal parameter range when we step temporarily outside
900 * the triangle, we shouldn't overflow or underflow for any
901 * pixel that's actually inside the triangle.
902 */
903
904 #ifdef INTERP_Z
905 {
906 GLfloat z0 = vLower->win[2];
907 if (depthBits <= 16) {
908 /* interpolate fixed-pt values */
909 GLfloat tmp = (z0 * FIXED_SCALE
910 + span.attrStepX[FRAG_ATTRIB_WPOS][2] * adjx
911 + span.attrStepY[FRAG_ATTRIB_WPOS][2] * adjy) + FIXED_HALF;
912 if (tmp < MAX_GLUINT / 2)
913 zLeft = (GLfixed) tmp;
914 else
915 zLeft = MAX_GLUINT / 2;
916 fdzOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_WPOS][2] + dxOuter * span.attrStepX[FRAG_ATTRIB_WPOS][2]);
917 }
918 else {
919 /* interpolate depth values w/out scaling */
920 zLeft = (GLuint) (z0 + span.attrStepX[FRAG_ATTRIB_WPOS][2] * FixedToFloat(adjx)
921 + span.attrStepY[FRAG_ATTRIB_WPOS][2] * FixedToFloat(adjy));
922 fdzOuter = (GLint) (span.attrStepY[FRAG_ATTRIB_WPOS][2] + dxOuter * span.attrStepX[FRAG_ATTRIB_WPOS][2]);
923 }
924 # ifdef DEPTH_TYPE
925 zRow = (DEPTH_TYPE *)
926 zrb->GetPointer(ctx, zrb, InterpToInt(fxLeftEdge), span.y);
927 dZRowOuter = (ctx->DrawBuffer->Width + idxOuter) * sizeof(DEPTH_TYPE);
928 # endif
929 }
930 #endif
931 #ifdef INTERP_W
932 wLeft = vLower->win[3] + (span.attrStepX[FRAG_ATTRIB_WPOS][3] * adjx + span.attrStepY[FRAG_ATTRIB_WPOS][3] * adjy) * (1.0F/FIXED_SCALE);
933 dwOuter = span.attrStepY[FRAG_ATTRIB_WPOS][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_WPOS][3];
934 #endif
935 #ifdef INTERP_FOG
936 # ifdef INTERP_W
937 fogLeft = vLower->fog * vLower->win[3] + (span.attrStepX[FRAG_ATTRIB_FOGC][0] * adjx + span.attrStepY[FRAG_ATTRIB_FOGC][0] * adjy) * (1.0F/FIXED_SCALE);
938 # else
939 fogLeft = vLower->fog + (span.attrStepX[FRAG_ATTRIB_FOGC][0] * adjx + span.attrStepY[FRAG_ATTRIB_FOGC][0] * adjy) * (1.0F/FIXED_SCALE);
940 # endif
941 dfogOuter = span.attrStepY[FRAG_ATTRIB_FOGC][0] + dxOuter * span.attrStepX[FRAG_ATTRIB_FOGC][0];
942 #endif
943 #ifdef INTERP_RGB
944 if (ctx->Light.ShadeModel == GL_SMOOTH) {
945 # if CHAN_TYPE == GL_FLOAT
946 rLeft = vLower->color[RCOMP] + (span.attrStepX[FRAG_ATTRIB_COL0][0] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][0] * adjy) * (1.0F / FIXED_SCALE);
947 gLeft = vLower->color[GCOMP] + (span.attrStepX[FRAG_ATTRIB_COL0][1] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][1] * adjy) * (1.0F / FIXED_SCALE);
948 bLeft = vLower->color[BCOMP] + (span.attrStepX[FRAG_ATTRIB_COL0][2] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][2] * adjy) * (1.0F / FIXED_SCALE);
949 fdrOuter = span.attrStepY[FRAG_ATTRIB_COL0][0] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][0];
950 fdgOuter = span.attrStepY[FRAG_ATTRIB_COL0][1] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][1];
951 fdbOuter = span.attrStepY[FRAG_ATTRIB_COL0][2] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][2];
952 # else
953 rLeft = (GLint)(ChanToFixed(vLower->color[RCOMP]) + span.attrStepX[FRAG_ATTRIB_COL0][0] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][0] * adjy) + FIXED_HALF;
954 gLeft = (GLint)(ChanToFixed(vLower->color[GCOMP]) + span.attrStepX[FRAG_ATTRIB_COL0][1] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][1] * adjy) + FIXED_HALF;
955 bLeft = (GLint)(ChanToFixed(vLower->color[BCOMP]) + span.attrStepX[FRAG_ATTRIB_COL0][2] * adjx + span.attrStepY[FRAG_ATTRIB_COL0][2] * adjy) + FIXED_HALF;
956 fdrOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL0][0] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][0]);
957 fdgOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL0][1] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][1]);
958 fdbOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL0][2] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][2]);
959 # endif
960 # ifdef INTERP_ALPHA
961 # if CHAN_TYPE == GL_FLOAT
962 aLeft = vLower->color[ACOMP] + (span.attrStepX[FRAG_ATTRIB_COL0][3] * adjx + span.attrStepX[FRAG_ATTRIB_COL0][3] * adjy) * (1.0F / FIXED_SCALE);
963 fdaOuter = span.attrStepX[FRAG_ATTRIB_COL0][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][3];
964 # else
965 aLeft = (GLint)(ChanToFixed(vLower->color[ACOMP]) + span.attrStepX[FRAG_ATTRIB_COL0][3] * adjx + span.attrStepX[FRAG_ATTRIB_COL0][3] * adjy) + FIXED_HALF;
966 fdaOuter = SignedFloatToFixed(span.attrStepX[FRAG_ATTRIB_COL0][3] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL0][3]);
967 # endif
968 # endif
969 }
970 else {
971 ASSERT(ctx->Light.ShadeModel == GL_FLAT);
972 # if CHAN_TYPE == GL_FLOAT
973 rLeft = v2->color[RCOMP];
974 gLeft = v2->color[GCOMP];
975 bLeft = v2->color[BCOMP];
976 fdrOuter = fdgOuter = fdbOuter = 0.0F;
977 # else
978 rLeft = ChanToFixed(v2->color[RCOMP]);
979 gLeft = ChanToFixed(v2->color[GCOMP]);
980 bLeft = ChanToFixed(v2->color[BCOMP]);
981 fdrOuter = fdgOuter = fdbOuter = 0;
982 # endif
983 # ifdef INTERP_ALPHA
984 # if CHAN_TYPE == GL_FLOAT
985 aLeft = v2->color[ACOMP];
986 fdaOuter = 0.0F;
987 # else
988 aLeft = ChanToFixed(v2->color[ACOMP]);
989 fdaOuter = 0;
990 # endif
991 # endif
992 }
993 #endif /* INTERP_RGB */
994
995
996 #ifdef INTERP_SPEC
997 if (ctx->Light.ShadeModel == GL_SMOOTH) {
998 # if CHAN_TYPE == GL_FLOAT
999 srLeft = vLower->specular[RCOMP] + (span.attrStepX[FRAG_ATTRIB_COL1][0] * adjx + span.attrStepY[FRAG_ATTRIB_COL1][0] * adjy) * (1.0F / FIXED_SCALE);
1000 sgLeft = vLower->specular[GCOMP] + (span.attrStepX[FRAG_ATTRIB_COL1][1] * adjx + span.attrStepY[FRAG_ATTRIB_COL1][1] * adjy) * (1.0F / FIXED_SCALE);
1001 sbLeft = vLower->specular[BCOMP] + (span.attrStepX[FRAG_ATTRIB_COL1][2] * adjx + span.attrStepY[FRAG_ATTRIB_COL1][2] * adjy) * (1.0F / FIXED_SCALE);
1002 dsrOuter = span.attrStepY[FRAG_ATTRIB_COL1][0] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL1][0];
1003 dsgOuter = span.attrStepY[FRAG_ATTRIB_COL1][1] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL1][1];
1004 dsbOuter = span.attrStepY[FRAG_ATTRIB_COL1][2] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL1][2];
1005 # else
1006 srLeft = (GLfixed) (ChanToFixed(vLower->specular[RCOMP]) + span.attrStepX[FRAG_ATTRIB_COL1][0] * adjx + span.attrStepY[FRAG_ATTRIB_COL1][0] * adjy) + FIXED_HALF;
1007 sgLeft = (GLfixed) (ChanToFixed(vLower->specular[GCOMP]) + span.attrStepX[FRAG_ATTRIB_COL1][1] * adjx + span.attrStepY[FRAG_ATTRIB_COL1][1] * adjy) + FIXED_HALF;
1008 sbLeft = (GLfixed) (ChanToFixed(vLower->specular[BCOMP]) + span.attrStepX[FRAG_ATTRIB_COL1][2] * adjx + span.attrStepY[FRAG_ATTRIB_COL1][2] * adjy) + FIXED_HALF;
1009 dsrOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL1][0] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL1][0]);
1010 dsgOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL1][1] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL1][1]);
1011 dsbOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_COL1][2] + dxOuter * span.attrStepX[FRAG_ATTRIB_COL1][2]);
1012 # endif
1013 }
1014 else {
1015 ASSERT(ctx->Light.ShadeModel == GL_FLAT);
1016 #if CHAN_TYPE == GL_FLOAT
1017 srLeft = v2->specular[RCOMP];
1018 sgLeft = v2->specular[GCOMP];
1019 sbLeft = v2->specular[BCOMP];
1020 dsrOuter = dsgOuter = dsbOuter = 0.0F;
1021 # else
1022 srLeft = ChanToFixed(v2->specular[RCOMP]);
1023 sgLeft = ChanToFixed(v2->specular[GCOMP]);
1024 sbLeft = ChanToFixed(v2->specular[BCOMP]);
1025 dsrOuter = dsgOuter = dsbOuter = 0;
1026 # endif
1027 }
1028 #endif
1029
1030 #ifdef INTERP_INDEX
1031 if (ctx->Light.ShadeModel == GL_SMOOTH) {
1032 iLeft = (GLfixed)(vLower->index * FIXED_SCALE
1033 + didx * adjx + didy * adjy) + FIXED_HALF;
1034 diOuter = SignedFloatToFixed(didy + dxOuter * didx);
1035 }
1036 else {
1037 ASSERT(ctx->Light.ShadeModel == GL_FLAT);
1038 iLeft = FloatToFixed(v2->index);
1039 diOuter = 0;
1040 }
1041 #endif
1042 #ifdef INTERP_INT_TEX
1043 {
1044 GLfloat s0, t0;
1045 s0 = vLower->texcoord[0][0] * S_SCALE;
1046 sLeft = (GLfixed)(s0 * FIXED_SCALE + span.attrStepX[FRAG_ATTRIB_TEX0][0] * adjx
1047 + span.attrStepY[FRAG_ATTRIB_TEX0][0] * adjy) + FIXED_HALF;
1048 dsOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_TEX0][0] + dxOuter * span.attrStepX[FRAG_ATTRIB_TEX0][0]);
1049
1050 t0 = vLower->texcoord[0][1] * T_SCALE;
1051 tLeft = (GLfixed)(t0 * FIXED_SCALE + span.attrStepX[FRAG_ATTRIB_TEX0][1] * adjx
1052 + span.attrStepY[FRAG_ATTRIB_TEX0][1] * adjy) + FIXED_HALF;
1053 dtOuter = SignedFloatToFixed(span.attrStepY[FRAG_ATTRIB_TEX0][1] + dxOuter * span.attrStepX[FRAG_ATTRIB_TEX0][1]);
1054 }
1055 #endif
1056 #ifdef INTERP_TEX
1057 TEX_UNIT_LOOP(
1058 const GLfloat invW = vLower->win[3];
1059 const GLfloat s0 = vLower->texcoord[u][0] * invW;
1060 const GLfloat t0 = vLower->texcoord[u][1] * invW;
1061 const GLfloat u0 = vLower->texcoord[u][2] * invW;
1062 const GLfloat v0 = vLower->texcoord[u][3] * invW;
1063 sLeft[u] = s0 + (span.attrStepX[attr][0] * adjx + span.attrStepY[attr][0] * adjy) * (1.0F/FIXED_SCALE);
1064 tLeft[u] = t0 + (span.attrStepX[attr][1] * adjx + span.attrStepY[attr][1] * adjy) * (1.0F/FIXED_SCALE);
1065 uLeft[u] = u0 + (span.attrStepX[attr][2] * adjx + span.attrStepY[attr][2] * adjy) * (1.0F/FIXED_SCALE);
1066 vLeft[u] = v0 + (span.attrStepX[attr][3] * adjx + span.attrStepY[attr][3] * adjy) * (1.0F/FIXED_SCALE);
1067 dsOuter[u] = span.attrStepY[attr][0] + dxOuter * span.attrStepX[attr][0];
1068 dtOuter[u] = span.attrStepY[attr][1] + dxOuter * span.attrStepX[attr][1];
1069 duOuter[u] = span.attrStepY[attr][2] + dxOuter * span.attrStepX[attr][2];
1070 dvOuter[u] = span.attrStepY[attr][3] + dxOuter * span.attrStepX[attr][3];
1071 )
1072 #endif
1073 #ifdef INTERP_VARYING
1074 VARYING_LOOP(
1075 const GLfloat invW = vLower->win[3];
1076 const GLfloat var0 = vLower->varying[iv][ic] * invW;
1077 varLeft[iv][ic] = var0 + (span.attrStepX[attr][ic] * adjx +
1078 span.attrStepY[attr][ic] * adjy) * (1.0f / FIXED_SCALE);
1079 dvarOuter[iv][ic] = span.attrStepY[attr][ic] + dxOuter * span.attrStepX[attr][ic];
1080 )
1081 #endif
1082 } /*if setupLeft*/
1083
1084
1085 if (setupRight && eRight->lines>0) {
1086 #if TRIANGLE_WALK_DOUBLE
1087 fxRightEdge = eRight->fsx;
1088 fdxRightEdge = eRight->dxdy;
1089 #else
1090 fxRightEdge = eRight->fsx - FIXED_EPSILON;
1091 fdxRightEdge = eRight->fdxdy;
1092 #endif
1093 }
1094
1095 if (lines==0) {
1096 continue;
1097 }
1098
1099
1100 /* Rasterize setup */
1101 #ifdef PIXEL_ADDRESS
1102 dPRowInner = dPRowOuter + sizeof(PIXEL_TYPE);
1103 #endif
1104 #ifdef INTERP_Z
1105 # ifdef DEPTH_TYPE
1106 dZRowInner = dZRowOuter + sizeof(DEPTH_TYPE);
1107 # endif
1108 fdzInner = fdzOuter + span.zStep;
1109 #endif
1110 #ifdef INTERP_W
1111 dwInner = dwOuter + span.attrStepX[FRAG_ATTRIB_WPOS][3];
1112 #endif
1113 #ifdef INTERP_FOG
1114 dfogInner = dfogOuter + span.attrStepX[FRAG_ATTRIB_FOGC][0];
1115 #endif
1116 #ifdef INTERP_RGB
1117 fdrInner = fdrOuter + span.redStep;
1118 fdgInner = fdgOuter + span.greenStep;
1119 fdbInner = fdbOuter + span.blueStep;
1120 #endif
1121 #ifdef INTERP_ALPHA
1122 fdaInner = fdaOuter + span.alphaStep;
1123 #endif
1124 #ifdef INTERP_SPEC
1125 dsrInner = dsrOuter + span.specRedStep;
1126 dsgInner = dsgOuter + span.specGreenStep;
1127 dsbInner = dsbOuter + span.specBlueStep;
1128 #endif
1129 #ifdef INTERP_INDEX
1130 diInner = diOuter + span.indexStep;
1131 #endif
1132 #ifdef INTERP_INT_TEX
1133 dsInner = dsOuter + span.intTexStep[0];
1134 dtInner = dtOuter + span.intTexStep[1];
1135 #endif
1136 #ifdef INTERP_TEX
1137 TEX_UNIT_LOOP(
1138 dsInner[u] = dsOuter[u] + span.attrStepX[attr][0];
1139 dtInner[u] = dtOuter[u] + span.attrStepX[attr][1];
1140 duInner[u] = duOuter[u] + span.attrStepX[attr][2];
1141 dvInner[u] = dvOuter[u] + span.attrStepX[attr][3];
1142 )
1143 #endif
1144 #ifdef INTERP_VARYING
1145 VARYING_LOOP(
1146 dvarInner[iv][ic] = dvarOuter[iv][ic] + span.attrStepX[attr][ic];
1147 )
1148 #endif
1149
1150 while (lines > 0) {
1151 /* initialize the span interpolants to the leftmost value */
1152 /* ff = fixed-pt fragment */
1153 const GLint right = InterpToInt(fxRightEdge);
1154 span.x = InterpToInt(fxLeftEdge);
1155 if (right <= span.x)
1156 span.end = 0;
1157 else
1158 span.end = right - span.x;
1159
1160 #ifdef INTERP_Z
1161 span.z = zLeft;
1162 #endif
1163 #ifdef INTERP_W
1164 span.attrStart[FRAG_ATTRIB_WPOS][3] = wLeft;
1165 #endif
1166 #ifdef INTERP_FOG
1167 span.attrStart[FRAG_ATTRIB_FOGC][0] = fogLeft;
1168 #endif
1169 #ifdef INTERP_RGB
1170 span.red = rLeft;
1171 span.green = gLeft;
1172 span.blue = bLeft;
1173 #endif
1174 #ifdef INTERP_ALPHA
1175 span.alpha = aLeft;
1176 #endif
1177 #ifdef INTERP_SPEC
1178 span.specRed = srLeft;
1179 span.specGreen = sgLeft;
1180 span.specBlue = sbLeft;
1181 #endif
1182 #ifdef INTERP_INDEX
1183 span.index = iLeft;
1184 #endif
1185 #ifdef INTERP_INT_TEX
1186 span.intTex[0] = sLeft;
1187 span.intTex[1] = tLeft;
1188 #endif
1189
1190 #ifdef INTERP_TEX
1191 TEX_UNIT_LOOP(
1192 span.attrStart[attr][0] = sLeft[u];
1193 span.attrStart[attr][1] = tLeft[u];
1194 span.attrStart[attr][2] = uLeft[u];
1195 span.attrStart[attr][3] = vLeft[u];
1196 )
1197 #endif
1198 #ifdef INTERP_VARYING
1199 VARYING_LOOP(
1200 span.attrStart[attr][ic] = varLeft[iv][ic];
1201 )
1202 #endif
1203
1204 /* This is where we actually generate fragments */
1205 /* XXX the test for span.y > 0 _shouldn't_ be needed but
1206 * it fixes a problem on 64-bit Opterons (bug 4842).
1207 */
1208 if (span.end > 0 && span.y >= 0) {
1209 const GLint len = span.end - 1;
1210 (void) len;
1211 #ifdef INTERP_RGB
1212 CLAMP_INTERPOLANT(red, redStep, len);
1213 CLAMP_INTERPOLANT(green, greenStep, len);
1214 CLAMP_INTERPOLANT(blue, blueStep, len);
1215 #endif
1216 #ifdef INTERP_ALPHA
1217 CLAMP_INTERPOLANT(alpha, alphaStep, len);
1218 #endif
1219 #ifdef INTERP_SPEC
1220 CLAMP_INTERPOLANT(specRed, specRedStep, len);
1221 CLAMP_INTERPOLANT(specGreen, specGreenStep, len);
1222 CLAMP_INTERPOLANT(specBlue, specBlueStep, len);
1223 #endif
1224 #ifdef INTERP_INDEX
1225 CLAMP_INTERPOLANT(index, indexStep, len);
1226 #endif
1227 {
1228 RENDER_SPAN( span );
1229 }
1230 }
1231
1232 /*
1233 * Advance to the next scan line. Compute the
1234 * new edge coordinates, and adjust the
1235 * pixel-center x coordinate so that it stays
1236 * on or inside the major edge.
1237 */
1238 span.y++;
1239 lines--;
1240
1241 fxLeftEdge += fdxLeftEdge;
1242 fxRightEdge += fdxRightEdge;
1243
1244 fError += fdError;
1245 if (fError >= 0) {
1246 fError -= INTERP_ONE;
1247
1248 #ifdef PIXEL_ADDRESS
1249 pRow = (PIXEL_TYPE *) ((GLubyte *) pRow + dPRowOuter);
1250 #endif
1251 #ifdef INTERP_Z
1252 # ifdef DEPTH_TYPE
1253 zRow = (DEPTH_TYPE *) ((GLubyte *) zRow + dZRowOuter);
1254 # endif
1255 zLeft += fdzOuter;
1256 #endif
1257 #ifdef INTERP_W
1258 wLeft += dwOuter;
1259 #endif
1260 #ifdef INTERP_FOG
1261 fogLeft += dfogOuter;
1262 #endif
1263 #ifdef INTERP_RGB
1264 rLeft += fdrOuter;
1265 gLeft += fdgOuter;
1266 bLeft += fdbOuter;
1267 #endif
1268 #ifdef INTERP_ALPHA
1269 aLeft += fdaOuter;
1270 #endif
1271 #ifdef INTERP_SPEC
1272 srLeft += dsrOuter;
1273 sgLeft += dsgOuter;
1274 sbLeft += dsbOuter;
1275 #endif
1276 #ifdef INTERP_INDEX
1277 iLeft += diOuter;
1278 #endif
1279 #ifdef INTERP_INT_TEX
1280 sLeft += dsOuter;
1281 tLeft += dtOuter;
1282 #endif
1283 #ifdef INTERP_TEX
1284 TEX_UNIT_LOOP(
1285 sLeft[u] += dsOuter[u];
1286 tLeft[u] += dtOuter[u];
1287 uLeft[u] += duOuter[u];
1288 vLeft[u] += dvOuter[u];
1289 )
1290 #endif
1291 #ifdef INTERP_VARYING
1292 VARYING_LOOP(
1293 varLeft[iv][ic] += dvarOuter[iv][ic];
1294 )
1295 #endif
1296 }
1297 else {
1298 #ifdef PIXEL_ADDRESS
1299 pRow = (PIXEL_TYPE *) ((GLubyte *) pRow + dPRowInner);
1300 #endif
1301 #ifdef INTERP_Z
1302 # ifdef DEPTH_TYPE
1303 zRow = (DEPTH_TYPE *) ((GLubyte *) zRow + dZRowInner);
1304 # endif
1305 zLeft += fdzInner;
1306 #endif
1307 #ifdef INTERP_W
1308 wLeft += dwInner;
1309 #endif
1310 #ifdef INTERP_FOG
1311 fogLeft += dfogInner;
1312 #endif
1313 #ifdef INTERP_RGB
1314 rLeft += fdrInner;
1315 gLeft += fdgInner;
1316 bLeft += fdbInner;
1317 #endif
1318 #ifdef INTERP_ALPHA
1319 aLeft += fdaInner;
1320 #endif
1321 #ifdef INTERP_SPEC
1322 srLeft += dsrInner;
1323 sgLeft += dsgInner;
1324 sbLeft += dsbInner;
1325 #endif
1326 #ifdef INTERP_INDEX
1327 iLeft += diInner;
1328 #endif
1329 #ifdef INTERP_INT_TEX
1330 sLeft += dsInner;
1331 tLeft += dtInner;
1332 #endif
1333 #ifdef INTERP_TEX
1334 TEX_UNIT_LOOP(
1335 sLeft[u] += dsInner[u];
1336 tLeft[u] += dtInner[u];
1337 uLeft[u] += duInner[u];
1338 vLeft[u] += dvInner[u];
1339 )
1340 #endif
1341 #ifdef INTERP_VARYING
1342 VARYING_LOOP(
1343 varLeft[iv][ic] += dvarInner[iv][ic];
1344 )
1345 #endif
1346 }
1347 } /*while lines>0*/
1348
1349 } /* for subTriangle */
1350
1351 }
1352 #ifdef CLEANUP_CODE
1353 CLEANUP_CODE
1354 #endif
1355 }
1356 }
1357
1358 #undef SETUP_CODE
1359 #undef CLEANUP_CODE
1360 #undef RENDER_SPAN
1361
1362 #undef PIXEL_TYPE
1363 #undef BYTES_PER_ROW
1364 #undef PIXEL_ADDRESS
1365 #undef DEPTH_TYPE
1366
1367 #undef INTERP_Z
1368 #undef INTERP_W
1369 #undef INTERP_FOG
1370 #undef INTERP_RGB
1371 #undef INTERP_ALPHA
1372 #undef INTERP_SPEC
1373 #undef INTERP_INDEX
1374 #undef INTERP_INT_TEX
1375 #undef INTERP_TEX
1376 #undef INTERP_MULTITEX
1377 #undef INTERP_VARYING
1378 #undef TEX_UNIT_LOOP
1379 #undef VARYING_LOOP
1380
1381 #undef S_SCALE
1382 #undef T_SCALE
1383
1384 #undef FixedToDepth
1385 #undef ColorTemp
1386 #undef GLinterp
1387 #undef InterpToInt
1388 #undef INTERP_ONE
1389
1390 #undef NAME