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 smooth or flat-shaded color index triangle.
  74  */
  75 #define NAME ci_triangle
  76 #define INTERP_Z 1
  77 #define INTERP_ATTRIBS 1  /* just for fog */
  78 #define INTERP_INDEX 1
  79 #define RENDER_SPAN( span )  _swrast_write_index_span(ctx, &span);
  80 #include "s_tritemp.h"
  81
  82
  83
  84 /*
  85  * Render a flat-shaded RGBA triangle.
  86  */
  87 #define NAME flat_rgba_triangle
  88 #define INTERP_Z 1
  89 #define SETUP_CODE                              \
  90    ASSERT(ctx->Texture._EnabledCoordUnits == 0);\
  91    ASSERT(ctx->Light.ShadeModel==GL_FLAT);      \
  92    span.interpMask |= SPAN_RGBA;                \
  93    span.red = ChanToFixed(v2->color[0]);        \
  94    span.green = ChanToFixed(v2->color[1]);      \
  95    span.blue = ChanToFixed(v2->color[2]);       \
  96    span.alpha = ChanToFixed(v2->color[3]);      \
  97    span.redStep = 0;                            \
  98    span.greenStep = 0;                          \
  99    span.blueStep = 0;                           \
 100    span.alphaStep = 0;
 101 #define RENDER_SPAN( span )  _swrast_write_rgba_span(ctx, &span);
 102 #include "s_tritemp.h"
 103
 104
 105
 106 /*
 107  * Render a smooth-shaded RGBA triangle.
 108  */
 109 #define NAME smooth_rgba_triangle
 110 #define INTERP_Z 1
 111 #define INTERP_RGB 1
 112 #define INTERP_ALPHA 1
 113 #define SETUP_CODE                              \
 114    {                                            \
 115       /* texturing must be off */               \
 116       ASSERT(ctx->Texture._EnabledCoordUnits == 0);     \
 117       ASSERT(ctx->Light.ShadeModel==GL_SMOOTH); \
 118    }
 119 #define RENDER_SPAN( span )  _swrast_write_rgba_span(ctx, &span);
 120 #include "s_tritemp.h"
 121
 122
 123
 124 /*
 125  * Render an RGB, GL_DECAL, textured triangle.
 126  * Interpolate S,T only w/out mipmapping or perspective correction.
 127  *
 128  * No fog.  No depth testing.
 129  */
 130 #define NAME simple_textured_triangle
 131 #define INTERP_INT_TEX 1
 132 #define S_SCALE twidth
 133 #define T_SCALE theight
 134
 135 #define SETUP_CODE                                                      \
 136    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];  \
 137    const struct gl_texture_object *obj =                                \
 138       ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];                \
 139    const struct gl_texture_image *texImg =                              \
 140       obj->Image[0][obj->BaseLevel];                                    \
 141    const GLfloat twidth = (GLfloat) texImg->Width;                      \
 142    const GLfloat theight = (GLfloat) texImg->Height;                    \
 143    const GLint twidth_log2 = texImg->WidthLog2;                         \
 144    const GLubyte *texture = (const GLubyte *) texImg->Data;             \
 145    const GLint smask = texImg->Width - 1;                               \
 146    const GLint tmask = texImg->Height - 1;                              \
 147    ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888);                     \
 148    if (!rb || !texture) {                                               \
 149       return;                                                           \
 150    }
 151
 152 #define RENDER_SPAN( span )                                             \
 153    GLuint i;                                                            \
 154    GLubyte rgb[MAX_WIDTH][3];                                           \
 155    span.intTex[0] -= FIXED_HALF; /* off-by-one error? */                \
 156    span.intTex[1] -= FIXED_HALF;                                        \
 157    for (i = 0; i < span.end; i++) {                                     \
 158       GLint s = FixedToInt(span.intTex[0]) & smask;                     \
 159       GLint t = FixedToInt(span.intTex[1]) & tmask;                     \
 160       GLint pos = (t << twidth_log2) + s;                               \
 161       pos = pos + pos + pos;  /* multiply by 3 */                       \
 162       rgb[i][RCOMP] = texture[pos+2];                                   \
 163       rgb[i][GCOMP] = texture[pos+1];                                   \
 164       rgb[i][BCOMP] = texture[pos+0];                                   \
 165       span.intTex[0] += span.intTexStep[0];                             \
 166       span.intTex[1] += span.intTexStep[1];                             \
 167    }                                                                    \
 168    rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, NULL);
 169
 170 #include "s_tritemp.h"
 171
 172
 173
 174 /*
 175  * Render an RGB, GL_DECAL, textured triangle.
 176  * Interpolate S,T, GL_LESS depth test, w/out mipmapping or
 177  * perspective correction.
 178  * Depth buffer bits must be <= sizeof(DEFAULT_SOFTWARE_DEPTH_TYPE)
 179  *
 180  * No fog.
 181  */
 182 #define NAME simple_z_textured_triangle
 183 #define INTERP_Z 1
 184 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 185 #define INTERP_INT_TEX 1
 186 #define S_SCALE twidth
 187 #define T_SCALE theight
 188
 189 #define SETUP_CODE                                                      \
 190    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];  \
 191    const struct gl_texture_object *obj =                                \
 192       ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];                \
 193    const struct gl_texture_image *texImg =                              \
 194        obj->Image[0][obj->BaseLevel];                                   \
 195    const GLfloat twidth = (GLfloat) texImg->Width;                      \
 196    const GLfloat theight = (GLfloat) texImg->Height;                    \
 197    const GLint twidth_log2 = texImg->WidthLog2;                         \
 198    const GLubyte *texture = (const GLubyte *) texImg->Data;             \
 199    const GLint smask = texImg->Width - 1;                               \
 200    const GLint tmask = texImg->Height - 1;                              \
 201    ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888);                     \
 202    if (!rb || !texture) {                                               \
 203       return;                                                           \
 204    }
 205
 206 #define RENDER_SPAN( span )                                             \
 207    GLuint i;                                                            \
 208    GLubyte rgb[MAX_WIDTH][3];                                           \
 209    span.intTex[0] -= FIXED_HALF; /* off-by-one error? */                \
 210    span.intTex[1] -= FIXED_HALF;                                        \
 211    for (i = 0; i < span.end; i++) {                                     \
 212       const GLuint z = FixedToDepth(span.z);                            \
 213       if (z < zRow[i]) {                                                \
 214          GLint s = FixedToInt(span.intTex[0]) & smask;                  \
 215          GLint t = FixedToInt(span.intTex[1]) & tmask;                  \
 216          GLint pos = (t << twidth_log2) + s;                            \
 217          pos = pos + pos + pos;  /* multiply by 3 */                    \
 218          rgb[i][RCOMP] = texture[pos+2];                                \
 219          rgb[i][GCOMP] = texture[pos+1];                                \
 220          rgb[i][BCOMP] = texture[pos+0];                                \
 221          zRow[i] = z;                                                   \
 222          span.array->mask[i] = 1;                                       \
 223       }                                                                 \
 224       else {                                                            \
 225          span.array->mask[i] = 0;                                       \
 226       }                                                                 \
 227       span.intTex[0] += span.intTexStep[0];                             \
 228       span.intTex[1] += span.intTexStep[1];                             \
 229       span.z += span.zStep;                                             \
 230    }                                                                    \
 231    rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, span.array->mask);
 232
 233 #include "s_tritemp.h"
 234
 235
 236 #if CHAN_TYPE != GL_FLOAT
 237
 238 struct affine_info
 239 {
 240    GLenum filter;
 241    GLenum format;
 242    GLenum envmode;
 243    GLint smask, tmask;
 244    GLint twidth_log2;
 245    const GLchan *texture;
 246    GLfixed er, eg, eb, ea;
 247    GLint tbytesline, tsize;
 248 };
 249
 250
 251 static INLINE GLint
 252 ilerp(GLint t, GLint a, GLint b)
 253 {
 254    return a + ((t * (b - a)) >> FIXED_SHIFT);
 255 }
 256
 257 static INLINE GLint
 258 ilerp_2d(GLint ia, GLint ib, GLint v00, GLint v10, GLint v01, GLint v11)
 259 {
 260    const GLint temp0 = ilerp(ia, v00, v10);
 261    const GLint temp1 = ilerp(ia, v01, v11);
 262    return ilerp(ib, temp0, temp1);
 263 }
 264
 265
 266 /* This function can handle GL_NEAREST or GL_LINEAR sampling of 2D RGB or RGBA
 267  * textures with GL_REPLACE, GL_MODULATE, GL_BLEND, GL_DECAL or GL_ADD
 268  * texture env modes.
 269  */
 270 static INLINE void
 271 affine_span(GLcontext *ctx, SWspan *span,
 272             struct affine_info *info)
 273 {
 274    GLchan sample[4];  /* the filtered texture sample */
 275    const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
 276
 277    /* Instead of defining a function for each mode, a test is done
 278     * between the outer and inner loops. This is to reduce code size
 279     * and complexity. Observe that an optimizing compiler kills
 280     * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
 281     */
 282
 283 #define NEAREST_RGB             \
 284    sample[RCOMP] = tex00[2];    \
 285    sample[GCOMP] = tex00[1];    \
 286    sample[BCOMP] = tex00[0];    \
 287    sample[ACOMP] = CHAN_MAX;
 288
 289 #define LINEAR_RGB                                                      \
 290    sample[RCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
 291    sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
 292    sample[BCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\
 293    sample[ACOMP] = CHAN_MAX;
 294
 295 #define NEAREST_RGBA  \
 296    sample[RCOMP] = tex00[3];    \
 297    sample[GCOMP] = tex00[2];    \
 298    sample[BCOMP] = tex00[1];    \
 299    sample[ACOMP] = tex00[0];
 300
 301 #define LINEAR_RGBA                                                     \
 302    sample[RCOMP] = ilerp_2d(sf, tf, tex00[3], tex01[3], tex10[3], tex11[3]);\
 303    sample[GCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
 304    sample[BCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
 305    sample[ACOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0])
 306
 307 #define MODULATE                                                          \
 308    dest[RCOMP] = span->red   * (sample[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \
 309    dest[GCOMP] = span->green * (sample[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \
 310    dest[BCOMP] = span->blue  * (sample[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \
 311    dest[ACOMP] = span->alpha * (sample[ACOMP] + 1u) >> (FIXED_SHIFT + 8)
 312
 313 #define DECAL                                                           \
 314    dest[RCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->red +              \
 315                ((sample[ACOMP] + 1) * sample[RCOMP] << FIXED_SHIFT))    \
 316                >> (FIXED_SHIFT + 8);                                    \
 317    dest[GCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->green +            \
 318                ((sample[ACOMP] + 1) * sample[GCOMP] << FIXED_SHIFT))    \
 319                >> (FIXED_SHIFT + 8);                                    \
 320    dest[BCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->blue +             \
 321                ((sample[ACOMP] + 1) * sample[BCOMP] << FIXED_SHIFT))    \
 322                >> (FIXED_SHIFT + 8);                                    \
 323    dest[ACOMP] = FixedToInt(span->alpha)
 324
 325 #define BLEND                                                           \
 326    dest[RCOMP] = ((CHAN_MAX - sample[RCOMP]) * span->red                \
 327                + (sample[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8);  \
 328    dest[GCOMP] = ((CHAN_MAX - sample[GCOMP]) * span->green              \
 329                + (sample[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8);  \
 330    dest[BCOMP] = ((CHAN_MAX - sample[BCOMP]) * span->blue               \
 331                + (sample[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8);  \
 332    dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8)
 333
 334 #define REPLACE  COPY_CHAN4(dest, sample)
 335
 336 #define ADD                                                             \
 337    {                                                                    \
 338       GLint rSum = FixedToInt(span->red)   + (GLint) sample[RCOMP];     \
 339       GLint gSum = FixedToInt(span->green) + (GLint) sample[GCOMP];     \
 340       GLint bSum = FixedToInt(span->blue)  + (GLint) sample[BCOMP];     \
 341       dest[RCOMP] = MIN2(rSum, CHAN_MAX);                               \
 342       dest[GCOMP] = MIN2(gSum, CHAN_MAX);                               \
 343       dest[BCOMP] = MIN2(bSum, CHAN_MAX);                               \
 344       dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8); \
 345   }
 346
 347 /* shortcuts */
 348
 349 #define NEAREST_RGB_REPLACE             \
 350    NEAREST_RGB;                         \
 351    dest[0] = sample[0];                 \
 352    dest[1] = sample[1];                 \
 353    dest[2] = sample[2];                 \
 354    dest[3] = FixedToInt(span->alpha);
 355
 356 #define NEAREST_RGBA_REPLACE  \
 357    dest[RCOMP] = tex00[3]; \
 358    dest[GCOMP] = tex00[2]; \
 359    dest[BCOMP] = tex00[1]; \
 360    dest[ACOMP] = tex00[0]
 361
 362 #define SPAN_NEAREST(DO_TEX, COMPS)                                     \
 363         for (i = 0; i < span->end; i++) {                               \
 364            /* Isn't it necessary to use FixedFloor below?? */           \
 365            GLint s = FixedToInt(span->intTex[0]) & info->smask;         \
 366            GLint t = FixedToInt(span->intTex[1]) & info->tmask;         \
 367            GLint pos = (t << info->twidth_log2) + s;                    \
 368            const GLchan *tex00 = info->texture + COMPS * pos;           \
 369            DO_TEX;                                                      \
 370            span->red += span->redStep;                                  \
 371            span->green += span->greenStep;                              \
 372            span->blue += span->blueStep;                                \
 373            span->alpha += span->alphaStep;                              \
 374            span->intTex[0] += span->intTexStep[0];                      \
 375            span->intTex[1] += span->intTexStep[1];                      \
 376            dest += 4;                                                   \
 377         }
 378
 379 #define SPAN_LINEAR(DO_TEX, COMPS)                                      \
 380         for (i = 0; i < span->end; i++) {                               \
 381            /* Isn't it necessary to use FixedFloor below?? */           \
 382            const GLint s = FixedToInt(span->intTex[0]) & info->smask;   \
 383            const GLint t = FixedToInt(span->intTex[1]) & info->tmask;   \
 384            const GLfixed sf = span->intTex[0] & FIXED_FRAC_MASK;        \
 385            const GLfixed tf = span->intTex[1] & FIXED_FRAC_MASK;        \
 386            const GLint pos = (t << info->twidth_log2) + s;              \
 387            const GLchan *tex00 = info->texture + COMPS * pos;           \
 388            const GLchan *tex10 = tex00 + info->tbytesline;              \
 389            const GLchan *tex01 = tex00 + COMPS;                         \
 390            const GLchan *tex11 = tex10 + COMPS;                         \
 391            if (t == info->tmask) {                                      \
 392               tex10 -= info->tsize;                                     \
 393               tex11 -= info->tsize;                                     \
 394            }                                                            \
 395            if (s == info->smask) {                                      \
 396               tex01 -= info->tbytesline;                                \
 397               tex11 -= info->tbytesline;                                \
 398            }                                                            \
 399            DO_TEX;                                                      \
 400            span->red += span->redStep;                                  \
 401            span->green += span->greenStep;                              \
 402            span->blue += span->blueStep;                                \
 403            span->alpha += span->alphaStep;                              \
 404            span->intTex[0] += span->intTexStep[0];                      \
 405            span->intTex[1] += span->intTexStep[1];                      \
 406            dest += 4;                                                   \
 407         }
 408
 409
 410    GLuint i;
 411    GLchan *dest = span->array->rgba[0];
 412
 413    /* Disable tex units so they're not re-applied in swrast_write_rgba_span */
 414    ctx->Texture._EnabledCoordUnits = 0x0;
 415
 416    span->intTex[0] -= FIXED_HALF;
 417    span->intTex[1] -= FIXED_HALF;
 418    switch (info->filter) {
 419    case GL_NEAREST:
 420       switch (info->format) {
 421       case MESA_FORMAT_RGB888:
 422          switch (info->envmode) {
 423          case GL_MODULATE:
 424             SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
 425             break;
 426          case GL_DECAL:
 427          case GL_REPLACE:
 428             SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
 429             break;
 430          case GL_BLEND:
 431             SPAN_NEAREST(NEAREST_RGB;BLEND,3);
 432             break;
 433          case GL_ADD:
 434             SPAN_NEAREST(NEAREST_RGB;ADD,3);
 435             break;
 436          default:
 437             _mesa_problem(ctx, "bad tex env mode in SPAN_LINEAR");
 438             return;
 439          }
 440          break;
 441       case MESA_FORMAT_RGBA8888:
 442          switch(info->envmode) {
 443          case GL_MODULATE:
 444             SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
 445             break;
 446          case GL_DECAL:
 447             SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
 448             break;
 449          case GL_BLEND:
 450             SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
 451             break;
 452          case GL_ADD:
 453             SPAN_NEAREST(NEAREST_RGBA;ADD,4);
 454             break;
 455          case GL_REPLACE:
 456             SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
 457             break;
 458          default:
 459             _mesa_problem(ctx, "bad tex env mode (2) in SPAN_LINEAR");
 460             return;
 461          }
 462          break;
 463       }
 464       break;
 465
 466    case GL_LINEAR:
 467       span->intTex[0] -= FIXED_HALF;
 468       span->intTex[1] -= FIXED_HALF;
 469       switch (info->format) {
 470       case MESA_FORMAT_RGB888:
 471          switch (info->envmode) {
 472          case GL_MODULATE:
 473             SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
 474             break;
 475          case GL_DECAL:
 476          case GL_REPLACE:
 477             SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
 478             break;
 479          case GL_BLEND:
 480             SPAN_LINEAR(LINEAR_RGB;BLEND,3);
 481             break;
 482          case GL_ADD:
 483             SPAN_LINEAR(LINEAR_RGB;ADD,3);
 484             break;
 485          default:
 486             _mesa_problem(ctx, "bad tex env mode (3) in SPAN_LINEAR");
 487             return;
 488          }
 489          break;
 490       case MESA_FORMAT_RGBA8888:
 491          switch (info->envmode) {
 492          case GL_MODULATE:
 493             SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
 494             break;
 495          case GL_DECAL:
 496             SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
 497             break;
 498          case GL_BLEND:
 499             SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
 500             break;
 501          case GL_ADD:
 502             SPAN_LINEAR(LINEAR_RGBA;ADD,4);
 503             break;
 504          case GL_REPLACE:
 505             SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
 506             break;
 507          default:
 508             _mesa_problem(ctx, "bad tex env mode (4) in SPAN_LINEAR");
 509             return;
 510          }
 511          break;
 512       }
 513       break;
 514    }
 515    span->interpMask &= ~SPAN_RGBA;
 516    ASSERT(span->arrayMask & SPAN_RGBA);
 517
 518    _swrast_write_rgba_span(ctx, span);
 519
 520    /* re-enable texture units */
 521    ctx->Texture._EnabledCoordUnits = texEnableSave;
 522
 523 #undef SPAN_NEAREST
 524 #undef SPAN_LINEAR
 525 }
 526
 527
 528
 529 /*
 530  * Render an RGB/RGBA textured triangle without perspective correction.
 531  */
 532 #define NAME affine_textured_triangle
 533 #define INTERP_Z 1
 534 #define INTERP_RGB 1
 535 #define INTERP_ALPHA 1
 536 #define INTERP_INT_TEX 1
 537 #define S_SCALE twidth
 538 #define T_SCALE theight
 539
 540 #define SETUP_CODE                                                      \
 541    struct affine_info info;                                             \
 542    struct gl_texture_unit *unit = ctx->Texture.Unit+0;                  \
 543    const struct gl_texture_object *obj =                                \
 544       ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];                \
 545    const struct gl_texture_image *texImg =                              \
 546       obj->Image[0][obj->BaseLevel];                                    \
 547    const GLfloat twidth = (GLfloat) texImg->Width;                      \
 548    const GLfloat theight = (GLfloat) texImg->Height;                    \
 549    info.texture = (const GLchan *) texImg->Data;                        \
 550    info.twidth_log2 = texImg->WidthLog2;                                \
 551    info.smask = texImg->Width - 1;                                      \
 552    info.tmask = texImg->Height - 1;                                     \
 553    info.format = texImg->TexFormat;                                     \
 554    info.filter = obj->MinFilter;                                        \
 555    info.envmode = unit->EnvMode;                                        \
 556    info.er = 0;                                 \
 557    info.eg = 0;                                 \
 558    info.eb = 0;                                 \
 559    span.arrayMask |= SPAN_RGBA;                                         \
 560                                                                         \
 561    if (info.envmode == GL_BLEND) {                                      \
 562       /* potential off-by-one error here? (1.0f -> 2048 -> 0) */        \
 563       info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF);        \
 564       info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF);        \
 565       info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF);        \
 566       info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF);        \
 567    }                                                                    \
 568    if (!info.texture) {                                                 \
 569       /* this shouldn't happen */                                       \
 570       return;                                                           \
 571    }                                                                    \
 572                                                                         \
 573    switch (info.format) {                                               \
 574    case MESA_FORMAT_RGB888:                                             \
 575       info.tbytesline = texImg->Width * 3;                              \
 576       break;                                                            \
 577    case MESA_FORMAT_RGBA8888:                                           \
 578       info.tbytesline = texImg->Width * 4;                              \
 579       break;                                                            \
 580    default:                                                             \
 581       _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\
 582       return;                                                           \
 583    }                                                                    \
 584    info.tsize = texImg->Height * info.tbytesline;
 585
 586 #define RENDER_SPAN( span )   affine_span(ctx, &span, &info);
 587
 588 #include "s_tritemp.h"
 589
 590
 591
 592 struct persp_info
 593 {
 594    GLenum filter;
 595    GLenum format;
 596    GLenum envmode;
 597    GLint smask, tmask;
 598    GLint twidth_log2;
 599    const GLchan *texture;
 600    GLfixed er, eg, eb, ea;   /* texture env color */
 601    GLint tbytesline, tsize;
 602 };
 603
 604
 605 static INLINE void
 606 fast_persp_span(GLcontext *ctx, SWspan *span,
 607                 struct persp_info *info)
 608 {
 609    GLchan sample[4];  /* the filtered texture sample */
 610
 611   /* Instead of defining a function for each mode, a test is done
 612    * between the outer and inner loops. This is to reduce code size
 613    * and complexity. Observe that an optimizing compiler kills
 614    * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
 615    */
 616 #define SPAN_NEAREST(DO_TEX,COMP)                                       \
 617         for (i = 0; i < span->end; i++) {                               \
 618            GLdouble invQ = tex_coord[2] ?                               \
 619                                  (1.0 / tex_coord[2]) : 1.0;            \
 620            GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ);             \
 621            GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ);             \
 622            GLint s = IFLOOR(s_tmp) & info->smask;                       \
 623            GLint t = IFLOOR(t_tmp) & info->tmask;                       \
 624            GLint pos = (t << info->twidth_log2) + s;                    \
 625            const GLchan *tex00 = info->texture + COMP * pos;            \
 626            DO_TEX;                                                      \
 627            span->red += span->redStep;                                  \
 628            span->green += span->greenStep;                              \
 629            span->blue += span->blueStep;                                \
 630            span->alpha += span->alphaStep;                              \
 631            tex_coord[0] += tex_step[0];                                 \
 632            tex_coord[1] += tex_step[1];                                 \
 633            tex_coord[2] += tex_step[2];                                 \
 634            dest += 4;                                                   \
 635         }
 636
 637 #define SPAN_LINEAR(DO_TEX,COMP)                                        \
 638         for (i = 0; i < span->end; i++) {                               \
 639            GLdouble invQ = tex_coord[2] ?                               \
 640                                  (1.0 / tex_coord[2]) : 1.0;            \
 641            const GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ);       \
 642            const GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ);       \
 643            const GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF;      \
 644            const GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF;      \
 645            const GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \
 646            const GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \
 647            const GLfixed sf = s_fix & FIXED_FRAC_MASK;                  \
 648            const GLfixed tf = t_fix & FIXED_FRAC_MASK;                  \
 649            const GLint pos = (t << info->twidth_log2) + s;              \
 650            const GLchan *tex00 = info->texture + COMP * pos;            \
 651            const GLchan *tex10 = tex00 + info->tbytesline;              \
 652            const GLchan *tex01 = tex00 + COMP;                          \
 653            const GLchan *tex11 = tex10 + COMP;                          \
 654            if (t == info->tmask) {                                      \
 655               tex10 -= info->tsize;                                     \
 656               tex11 -= info->tsize;                                     \
 657            }                                                            \
 658            if (s == info->smask) {                                      \
 659               tex01 -= info->tbytesline;                                \
 660               tex11 -= info->tbytesline;                                \
 661            }                                                            \
 662            DO_TEX;                                                      \
 663            span->red   += span->redStep;                                \
 664            span->green += span->greenStep;                              \
 665            span->blue  += span->blueStep;                               \
 666            span->alpha += span->alphaStep;                              \
 667            tex_coord[0] += tex_step[0];                                 \
 668            tex_coord[1] += tex_step[1];                                 \
 669            tex_coord[2] += tex_step[2];                                 \
 670            dest += 4;                                                   \
 671         }
 672
 673    GLuint i;
 674    GLfloat tex_coord[3], tex_step[3];
 675    GLchan *dest = span->array->rgba[0];
 676
 677    const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
 678    ctx->Texture._EnabledCoordUnits = 0;
 679
 680    tex_coord[0] = span->attrStart[FRAG_ATTRIB_TEX0][0]  * (info->smask + 1);
 681    tex_step[0] = span->attrStepX[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
 682    tex_coord[1] = span->attrStart[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
 683    tex_step[1] = span->attrStepX[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
 684    /* span->attrStart[FRAG_ATTRIB_TEX0][2] only if 3D-texturing, here only 2D */
 685    tex_coord[2] = span->attrStart[FRAG_ATTRIB_TEX0][3];
 686    tex_step[2] = span->attrStepX[FRAG_ATTRIB_TEX0][3];
 687
 688    switch (info->filter) {
 689    case GL_NEAREST:
 690       switch (info->format) {
 691       case MESA_FORMAT_RGB888:
 692          switch (info->envmode) {
 693          case GL_MODULATE:
 694             SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
 695             break;
 696          case GL_DECAL:
 697          case GL_REPLACE:
 698             SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
 699             break;
 700          case GL_BLEND:
 701             SPAN_NEAREST(NEAREST_RGB;BLEND,3);
 702             break;
 703          case GL_ADD:
 704             SPAN_NEAREST(NEAREST_RGB;ADD,3);
 705             break;
 706          default:
 707             _mesa_problem(ctx, "bad tex env mode (5) in SPAN_LINEAR");
 708             return;
 709          }
 710          break;
 711       case MESA_FORMAT_RGBA8888:
 712          switch(info->envmode) {
 713          case GL_MODULATE:
 714             SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
 715             break;
 716          case GL_DECAL:
 717             SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
 718             break;
 719          case GL_BLEND:
 720             SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
 721             break;
 722          case GL_ADD:
 723             SPAN_NEAREST(NEAREST_RGBA;ADD,4);
 724             break;
 725          case GL_REPLACE:
 726             SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
 727             break;
 728          default:
 729             _mesa_problem(ctx, "bad tex env mode (6) in SPAN_LINEAR");
 730             return;
 731          }
 732          break;
 733       }
 734       break;
 735
 736    case GL_LINEAR:
 737       switch (info->format) {
 738       case MESA_FORMAT_RGB888:
 739          switch (info->envmode) {
 740          case GL_MODULATE:
 741             SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
 742             break;
 743          case GL_DECAL:
 744          case GL_REPLACE:
 745             SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
 746             break;
 747          case GL_BLEND:
 748             SPAN_LINEAR(LINEAR_RGB;BLEND,3);
 749             break;
 750          case GL_ADD:
 751             SPAN_LINEAR(LINEAR_RGB;ADD,3);
 752             break;
 753          default:
 754             _mesa_problem(ctx, "bad tex env mode (7) in SPAN_LINEAR");
 755             return;
 756          }
 757          break;
 758       case MESA_FORMAT_RGBA8888:
 759          switch (info->envmode) {
 760          case GL_MODULATE:
 761             SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
 762             break;
 763          case GL_DECAL:
 764             SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
 765             break;
 766          case GL_BLEND:
 767             SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
 768             break;
 769          case GL_ADD:
 770             SPAN_LINEAR(LINEAR_RGBA;ADD,4);
 771             break;
 772          case GL_REPLACE:
 773             SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
 774             break;
 775          default:
 776             _mesa_problem(ctx, "bad tex env mode (8) in SPAN_LINEAR");
 777             return;
 778          }
 779          break;
 780       }
 781       break;
 782    }
 783
 784    ASSERT(span->arrayMask & SPAN_RGBA);
 785    _swrast_write_rgba_span(ctx, span);
 786
 787 #undef SPAN_NEAREST
 788 #undef SPAN_LINEAR
 789
 790    /* restore state */
 791    ctx->Texture._EnabledCoordUnits = texEnableSave;
 792 }
 793
 794
 795 /*
 796  * Render an perspective corrected RGB/RGBA textured triangle.
 797  * The Q (aka V in Mesa) coordinate must be zero such that the divide
 798  * by interpolated Q/W comes out right.
 799  *
 800  */
 801 #define NAME persp_textured_triangle
 802 #define INTERP_Z 1
 803 #define INTERP_RGB 1
 804 #define INTERP_ALPHA 1
 805 #define INTERP_ATTRIBS 1
 806
 807 #define SETUP_CODE                                                      \
 808    struct persp_info info;                                              \
 809    const struct gl_texture_unit *unit = ctx->Texture.Unit+0;            \
 810    const struct gl_texture_object *obj =                                \
 811       ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];                \
 812    const struct gl_texture_image *texImg =                              \
 813       obj->Image[0][obj->BaseLevel];                                    \
 814    info.texture = (const GLchan *) texImg->Data;                        \
 815    info.twidth_log2 = texImg->WidthLog2;                                \
 816    info.smask = texImg->Width - 1;                                      \
 817    info.tmask = texImg->Height - 1;                                     \
 818    info.format = texImg->TexFormat;                                     \
 819    info.filter = obj->MinFilter;                                        \
 820    info.envmode = unit->EnvMode;                                        \
 821    info.er = 0;                                 \
 822    info.eg = 0;                                 \
 823    info.eb = 0;                                 \
 824                                                                         \
 825    if (info.envmode == GL_BLEND) {                                      \
 826       /* potential off-by-one error here? (1.0f -> 2048 -> 0) */        \
 827       info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF);        \
 828       info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF);        \
 829       info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF);        \
 830       info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF);        \
 831    }                                                                    \
 832    if (!info.texture) {                                                 \
 833       /* this shouldn't happen */                                       \
 834       return;                                                           \
 835    }                                                                    \
 836                                                                         \
 837    switch (info.format) {                                               \
 838    case MESA_FORMAT_RGB888:                                             \
 839       info.tbytesline = texImg->Width * 3;                              \
 840       break;                                                            \
 841    case MESA_FORMAT_RGBA8888:                                           \
 842       info.tbytesline = texImg->Width * 4;                              \
 843       break;                                                            \
 844    default:                                                             \
 845       _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\
 846       return;                                                           \
 847    }                                                                    \
 848    info.tsize = texImg->Height * info.tbytesline;
 849
 850 #define RENDER_SPAN( span )                     \
 851    span.interpMask &= ~SPAN_RGBA;               \
 852    span.arrayMask |= SPAN_RGBA;                 \
 853    fast_persp_span(ctx, &span, &info);
 854
 855 #include "s_tritemp.h"
 856
 857 #endif /*CHAN_TYPE != GL_FLOAT*/
 858
 859
 860
 861 /*
 862  * Render an RGBA triangle with arbitrary attributes.
 863  */
 864 #define NAME general_triangle
 865 #define INTERP_Z 1
 866 #define INTERP_RGB 1
 867 #define INTERP_ALPHA 1
 868 #define INTERP_ATTRIBS 1
 869 #define RENDER_SPAN( span )   _swrast_write_rgba_span(ctx, &span);
 870 #include "s_tritemp.h"
 871
 872
 873
 874
 875 /*
 876  * Special tri function for occlusion testing
 877  */
 878 #define NAME occlusion_zless_triangle
 879 #define INTERP_Z 1
 880 #define SETUP_CODE                                                      \
 881    struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer;          \
 882    struct gl_query_object *q = ctx->Query.CurrentOcclusionObject;       \
 883    ASSERT(ctx->Depth.Test);                                             \
 884    ASSERT(!ctx->Depth.Mask);                                            \
 885    ASSERT(ctx->Depth.Func == GL_LESS);                                  \
 886    if (!q) {                                                            \
 887       return;                                                           \
 888    }
 889 #define RENDER_SPAN( span )                                             \
 890    if (rb->Format == MESA_FORMAT_Z16) {                                 \
 891       GLuint i;                                                         \
 892       const GLushort *zRow = (const GLushort *)                         \
 893          rb->GetPointer(ctx, rb, span.x, span.y);                       \
 894       for (i = 0; i < span.end; i++) {                                  \
 895          GLuint z = FixedToDepth(span.z);                               \
 896          if (z < zRow[i]) {                                             \
 897             q->Result++;                                                \
 898          }                                                              \
 899          span.z += span.zStep;                                          \
 900       }                                                                 \
 901    }                                                                    \
 902    else {                                                               \
 903       GLuint i;                                                         \
 904       const GLuint *zRow = (const GLuint *)                             \
 905          rb->GetPointer(ctx, rb, span.x, span.y);                       \
 906       for (i = 0; i < span.end; i++) {                                  \
 907          if ((GLuint)span.z < zRow[i]) {                                \
 908             q->Result++;                                                \
 909          }                                                              \
 910          span.z += span.zStep;                                          \
 911       }                                                                 \
 912    }
 913 #include "s_tritemp.h"
 914
 915
 916
 917 static void
 918 nodraw_triangle( GLcontext *ctx,
 919                  const SWvertex *v0,
 920                  const SWvertex *v1,
 921                  const SWvertex *v2 )
 922 {
 923    (void) (ctx && v0 && v1 && v2);
 924 }
 925
 926
 927 /*
 928  * This is used when separate specular color is enabled, but not
 929  * texturing.  We add the specular color to the primary color,
 930  * draw the triangle, then restore the original primary color.
 931  * Inefficient, but seldom needed.
 932  */
 933 void
 934 _swrast_add_spec_terms_triangle(GLcontext *ctx, const SWvertex *v0,
 935                                 const SWvertex *v1, const SWvertex *v2)
 936 {
 937    SWvertex *ncv0 = (SWvertex *)v0; /* drop const qualifier */
 938    SWvertex *ncv1 = (SWvertex *)v1;
 939    SWvertex *ncv2 = (SWvertex *)v2;
 940    GLfloat rSum, gSum, bSum;
 941    GLchan cSave[3][4];
 942
 943    /* save original colors */
 944    COPY_CHAN4( cSave[0], ncv0->color );
 945    COPY_CHAN4( cSave[1], ncv1->color );
 946    COPY_CHAN4( cSave[2], ncv2->color );
 947    /* sum v0 */
 948    rSum = CHAN_TO_FLOAT(ncv0->color[0]) + ncv0->attrib[FRAG_ATTRIB_COL1][0];
 949    gSum = CHAN_TO_FLOAT(ncv0->color[1]) + ncv0->attrib[FRAG_ATTRIB_COL1][1];
 950    bSum = CHAN_TO_FLOAT(ncv0->color[2]) + ncv0->attrib[FRAG_ATTRIB_COL1][2];
 951    UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[0], rSum);
 952    UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[1], gSum);
 953    UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[2], bSum);
 954    /* sum v1 */
 955    rSum = CHAN_TO_FLOAT(ncv1->color[0]) + ncv1->attrib[FRAG_ATTRIB_COL1][0];
 956    gSum = CHAN_TO_FLOAT(ncv1->color[1]) + ncv1->attrib[FRAG_ATTRIB_COL1][1];
 957    bSum = CHAN_TO_FLOAT(ncv1->color[2]) + ncv1->attrib[FRAG_ATTRIB_COL1][2];
 958    UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[0], rSum);
 959    UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[1], gSum);
 960    UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[2], bSum);
 961    /* sum v2 */
 962    rSum = CHAN_TO_FLOAT(ncv2->color[0]) + ncv2->attrib[FRAG_ATTRIB_COL1][0];
 963    gSum = CHAN_TO_FLOAT(ncv2->color[1]) + ncv2->attrib[FRAG_ATTRIB_COL1][1];
 964    bSum = CHAN_TO_FLOAT(ncv2->color[2]) + ncv2->attrib[FRAG_ATTRIB_COL1][2];
 965    UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[0], rSum);
 966    UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[1], gSum);
 967    UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[2], bSum);
 968    /* draw */
 969    SWRAST_CONTEXT(ctx)->SpecTriangle( ctx, ncv0, ncv1, ncv2 );
 970    /* restore original colors */
 971    COPY_CHAN4( ncv0->color, cSave[0] );
 972    COPY_CHAN4( ncv1->color, cSave[1] );
 973    COPY_CHAN4( ncv2->color, cSave[2] );
 974 }
 975
 976
 977
 978 #ifdef DEBUG
 979
 980 /* record the current triangle function name */
 981 const char *_mesa_triFuncName = NULL;
 982
 983 #define USE(triFunc)                            \
 984 do {                                            \
 985     _mesa_triFuncName = #triFunc;               \
 986     /*printf("%s\n", _mesa_triFuncName);*/      \
 987     swrast->Triangle = triFunc;                 \
 988 } while (0)
 989
 990 #else
 991
 992 #define USE(triFunc)  swrast->Triangle = triFunc;
 993
 994 #endif
 995
 996
 997
 998
 999 /*
1000  * Determine which triangle rendering function to use given the current
1001  * rendering context.
1002  *
1003  * Please update the summary flag _SWRAST_NEW_TRIANGLE if you add or
1004  * remove tests to this code.
1005  */
1006 void
1007 _swrast_choose_triangle( GLcontext *ctx )
1008 {
1009    SWcontext *swrast = SWRAST_CONTEXT(ctx);
1010    const GLboolean rgbmode = ctx->Visual.rgbMode;
1011
1012    if (ctx->Polygon.CullFlag &&
1013        ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
1014       USE(nodraw_triangle);
1015       return;
1016    }
1017
1018    if (ctx->RenderMode==GL_RENDER) {
1019
1020       if (ctx->Polygon.SmoothFlag) {
1021          _swrast_set_aa_triangle_function(ctx);
1022          ASSERT(swrast->Triangle);
1023          return;
1024       }
1025
1026       /* special case for occlusion testing */
1027       if (ctx->Query.CurrentOcclusionObject &&
1028           ctx->Depth.Test &&
1029           ctx->Depth.Mask == GL_FALSE &&
1030           ctx->Depth.Func == GL_LESS &&
1031           !ctx->Stencil._Enabled) {
1032          if ((rgbmode &&
1033               ctx->Color.ColorMask[0][0] == 0 &&
1034               ctx->Color.ColorMask[0][1] == 0 &&
1035               ctx->Color.ColorMask[0][2] == 0 &&
1036               ctx->Color.ColorMask[0][3] == 0)
1037              ||
1038              (!rgbmode && ctx->Color.IndexMask == 0)) {
1039             USE(occlusion_zless_triangle);
1040             return;
1041          }
1042       }
1043
1044       if (!rgbmode) {
1045          USE(ci_triangle);
1046          return;
1047       }
1048
1049       /*
1050        * XXX should examine swrast->_ActiveAttribMask to determine what
1051        * needs to be interpolated.
1052        */
1053       if (ctx->Texture._EnabledCoordUnits ||
1054           ctx->FragmentProgram._Current ||
1055           ctx->ATIFragmentShader._Enabled ||
1056           NEED_SECONDARY_COLOR(ctx) ||
1057           swrast->_FogEnabled) {
1058          /* Ugh, we do a _lot_ of tests to pick the best textured tri func */
1059          const struct gl_texture_object *texObj2D;
1060          const struct gl_texture_image *texImg;
1061          GLenum minFilter, magFilter, envMode;
1062          gl_format format;
1063          texObj2D = ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];
1064
1065          texImg = texObj2D ? texObj2D->Image[0][texObj2D->BaseLevel] : NULL;
1066          format = texImg ? texImg->TexFormat : MESA_FORMAT_NONE;
1067          minFilter = texObj2D ? texObj2D->MinFilter : GL_NONE;
1068          magFilter = texObj2D ? texObj2D->MagFilter : GL_NONE;
1069          envMode = ctx->Texture.Unit[0].EnvMode;
1070
1071          /* First see if we can use an optimized 2-D texture function */
1072          if (ctx->Texture._EnabledCoordUnits == 0x1
1073              && !ctx->FragmentProgram._Current
1074              && !ctx->ATIFragmentShader._Enabled
1075              && ctx->Texture._EnabledUnits == 0x1
1076              && ctx->Texture.Unit[0]._ReallyEnabled == TEXTURE_2D_BIT
1077              && texObj2D->WrapS == GL_REPEAT
1078              && texObj2D->WrapT == GL_REPEAT
1079              && texObj2D->_Swizzle == SWIZZLE_NOOP
1080              && texImg->_IsPowerOfTwo
1081              && texImg->Border == 0
1082              && texImg->Width == texImg->RowStride
1083              && (format == MESA_FORMAT_RGB888 || format == MESA_FORMAT_RGBA8888)
1084              && minFilter == magFilter
1085              && ctx->Light.Model.ColorControl == GL_SINGLE_COLOR
1086              && !swrast->_FogEnabled
1087              && ctx->Texture.Unit[0].EnvMode != GL_COMBINE_EXT
1088              && ctx->Texture.Unit[0].EnvMode != GL_COMBINE4_NV) {
1089             if (ctx->Hint.PerspectiveCorrection==GL_FASTEST) {
1090                if (minFilter == GL_NEAREST
1091                    && format == MESA_FORMAT_RGB888
1092                    && (envMode == GL_REPLACE || envMode == GL_DECAL)
1093                    && ((swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)
1094                         && ctx->Depth.Func == GL_LESS
1095                         && ctx->Depth.Mask == GL_TRUE)
1096                        || swrast->_RasterMask == TEXTURE_BIT)
1097                    && ctx->Polygon.StippleFlag == GL_FALSE
1098                    && ctx->DrawBuffer->Visual.depthBits <= 16) {
1099                   if (swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)) {
1100                      USE(simple_z_textured_triangle);
1101                   }
1102                   else {
1103                      USE(simple_textured_triangle);
1104                   }
1105                }
1106                else {
1107 #if CHAN_BITS != 8
1108                   USE(general_triangle);
1109 #else
1110                   if (format == MESA_FORMAT_RGBA8888 && !_mesa_little_endian()) {
1111                      /* We only handle RGBA8888 correctly on little endian
1112                       * in the optimized code above.
1113                       */
1114                      USE(general_triangle);
1115                   }
1116                   else {
1117                      USE(affine_textured_triangle);
1118                  }
1119 #endif
1120                }
1121             }
1122             else {
1123 #if CHAN_BITS != 8
1124                USE(general_triangle);
1125 #else
1126                USE(persp_textured_triangle);
1127 #endif
1128             }
1129          }
1130          else {
1131             /* general case textured triangles */
1132             USE(general_triangle);
1133          }
1134       }
1135       else {
1136          ASSERT(!swrast->_FogEnabled);
1137          ASSERT(!NEED_SECONDARY_COLOR(ctx));
1138          if (ctx->Light.ShadeModel==GL_SMOOTH) {
1139             /* smooth shaded, no texturing, stippled or some raster ops */
1140 #if CHAN_BITS != 8
1141                USE(general_triangle);
1142 #else
1143                USE(smooth_rgba_triangle);
1144 #endif
1145          }
1146          else {
1147             /* flat shaded, no texturing, stippled or some raster ops */
1148 #if CHAN_BITS != 8
1149             USE(general_triangle);
1150 #else
1151             USE(flat_rgba_triangle);
1152 #endif
1153          }
1154       }
1155    }
1156    else if (ctx->RenderMode==GL_FEEDBACK) {
1157       USE(_swrast_feedback_triangle);
1158    }
1159    else {
1160       /* GL_SELECT mode */
1161       USE(_swrast_select_triangle);
1162    }
1163 }