src/mesa/swrast/s_drawpix.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  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 #include "glheader.h"
  27 #include "bufferobj.h"
  28 #include "context.h"
  29 #include "convolve.h"
  30 #include "image.h"
  31 #include "macros.h"
  32 #include "imports.h"
  33 #include "pixel.h"
  34
  35 #include "s_context.h"
  36 #include "s_drawpix.h"
  37 #include "s_span.h"
  38 #include "s_stencil.h"
  39 #include "s_zoom.h"
  40
  41
  42 /*
  43  * Try to do a fast and simple RGB(a) glDrawPixels.
  44  * Return:  GL_TRUE if success, GL_FALSE if slow path must be used instead
  45  */
  46 static GLboolean
  47 fast_draw_pixels(GLcontext *ctx, GLint x, GLint y,
  48                  GLsizei width, GLsizei height,
  49                  GLenum format, GLenum type,
  50                  const struct gl_pixelstore_attrib *unpack,
  51                  const GLvoid *pixels)
  52 {
  53    const GLint imgX = x, imgY = y;
  54    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    struct sw_span span;
  57
  58    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
  59
  60    if (swrast->_RasterMask & MULTI_DRAW_BIT)
  61       return GL_FALSE;
  62
  63    if (ctx->Depth.Test)
  64       _swrast_span_default_z(ctx, &span);
  65    if (swrast->_FogEnabled)
  66       _swrast_span_default_fog(ctx, &span);
  67    if (ctx->Texture._EnabledCoordUnits)
  68       _swrast_span_default_texcoords(ctx, &span);
  69
  70    if ((SWRAST_CONTEXT(ctx)->_RasterMask & ~CLIP_BIT) == 0
  71        && ctx->Texture._EnabledCoordUnits == 0
  72        && unpack->Alignment == 1
  73        && !unpack->SwapBytes
  74        && !unpack->LsbFirst) {
  75
  76       /* XXX there's a lot of clipping code here that should be replaced
  77        * by a call to _mesa_clip_drawpixels().
  78        */
  79       GLint destX = x;
  80       GLint destY = y;
  81       GLint drawWidth = width;           /* actual width drawn */
  82       GLint drawHeight = height;         /* actual height drawn */
  83       GLint skipPixels = unpack->SkipPixels;
  84       GLint skipRows = unpack->SkipRows;
  85       GLint rowLength;
  86
  87       if (unpack->RowLength > 0)
  88          rowLength = unpack->RowLength;
  89       else
  90          rowLength = width;
  91
  92       /* If we're not using pixel zoom then do all clipping calculations
  93        * now.  Otherwise, we'll let the _swrast_write_zoomed_*_span() functions
  94        * handle the clipping.
  95        */
  96       if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
  97          /* horizontal clipping */
  98          if (destX < ctx->DrawBuffer->_Xmin) {
  99             skipPixels += (ctx->DrawBuffer->_Xmin - destX);
 100             drawWidth  -= (ctx->DrawBuffer->_Xmin - destX);
 101             destX = ctx->DrawBuffer->_Xmin;
 102          }
 103          if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
 104             drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
 105          if (drawWidth <= 0)
 106             return GL_TRUE;
 107
 108          /* vertical clipping */
 109          if (destY < ctx->DrawBuffer->_Ymin) {
 110             skipRows   += (ctx->DrawBuffer->_Ymin - destY);
 111             drawHeight -= (ctx->DrawBuffer->_Ymin - destY);
 112             destY = ctx->DrawBuffer->_Ymin;
 113          }
 114          if (destY + drawHeight > ctx->DrawBuffer->_Ymax)
 115             drawHeight -= (destY + drawHeight - ctx->DrawBuffer->_Ymax);
 116          if (drawHeight <= 0)
 117             return GL_TRUE;
 118       }
 119       else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 120          /* upside-down image */
 121          /* horizontal clipping */
 122          if (destX < ctx->DrawBuffer->_Xmin) {
 123             skipPixels += (ctx->DrawBuffer->_Xmin - destX);
 124             drawWidth  -= (ctx->DrawBuffer->_Xmin - destX);
 125             destX = ctx->DrawBuffer->_Xmin;
 126          }
 127          if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
 128             drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
 129          if (drawWidth <= 0)
 130             return GL_TRUE;
 131
 132          /* vertical clipping */
 133          if (destY > ctx->DrawBuffer->_Ymax) {
 134             skipRows   += (destY - ctx->DrawBuffer->_Ymax);
 135             drawHeight -= (destY - ctx->DrawBuffer->_Ymax);
 136             destY = ctx->DrawBuffer->_Ymax;
 137          }
 138          if (destY - drawHeight < ctx->DrawBuffer->_Ymin)
 139             drawHeight -= (ctx->DrawBuffer->_Ymin - (destY - drawHeight));
 140          if (drawHeight <= 0)
 141             return GL_TRUE;
 142       }
 143       else {
 144          if (drawWidth > MAX_WIDTH)
 145             return GL_FALSE; /* fall back to general case path */
 146       }
 147
 148
 149       /*
 150        * Ready to draw!
 151        * The window region at (destX, destY) of size (drawWidth, drawHeight)
 152        * will be written to.
 153        * We'll take pixel data from buffer pointed to by "pixels" but we'll
 154        * skip "skipRows" rows and skip "skipPixels" pixels/row.
 155        */
 156
 157       if (format == GL_RGBA && type == CHAN_TYPE
 158           && ctx->_ImageTransferState==0) {
 159          if (ctx->Visual.rgbMode) {
 160             GLchan *src = (GLchan *) pixels
 161                + (skipRows * rowLength + skipPixels) * 4;
 162             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 163                /* no zooming */
 164                GLint row;
 165                for (row=0; row<drawHeight; row++) {
 166                   rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
 167                   src += rowLength * 4;
 168                   destY++;
 169                }
 170             }
 171             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 172                /* upside-down */
 173                GLint row;
 174                for (row=0; row<drawHeight; row++) {
 175                   destY--;
 176                   rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
 177                   src += rowLength * 4;
 178                }
 179             }
 180             else {
 181                /* with zooming */
 182                GLint row;
 183                for (row=0; row<drawHeight; row++) {
 184                   span.x = destX;
 185                   span.y = destY + row;
 186                   span.end = drawWidth;
 187                   _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 188                                                  (CONST GLchan (*)[4]) src);
 189                   src += rowLength * 4;
 190                }
 191             }
 192          }
 193          return GL_TRUE;
 194       }
 195       else if (format == GL_RGB && type == CHAN_TYPE
 196                && ctx->_ImageTransferState == 0) {
 197          if (ctx->Visual.rgbMode) {
 198             GLchan *src = (GLchan *) pixels
 199                + (skipRows * rowLength + skipPixels) * 3;
 200             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 201                GLint row;
 202                for (row=0; row<drawHeight; row++) {
 203                   rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
 204                   src += rowLength * 3;
 205                   destY++;
 206                }
 207             }
 208             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 209                /* upside-down */
 210                GLint row;
 211                for (row=0; row<drawHeight; row++) {
 212                   destY--;
 213                   rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
 214                   src += rowLength * 3;
 215                }
 216             }
 217             else {
 218                /* with zooming */
 219                GLint row;
 220                for (row=0; row<drawHeight; row++) {
 221                   span.x = destX;
 222                   span.y = destY;
 223                   span.end = drawWidth;
 224                   _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span,
 225                                          (CONST GLchan (*)[3]) src);
 226                   src += rowLength * 3;
 227                   destY++;
 228                }
 229             }
 230          }
 231          return GL_TRUE;
 232       }
 233       else if (format == GL_LUMINANCE && type == CHAN_TYPE
 234                && ctx->_ImageTransferState==0) {
 235          if (ctx->Visual.rgbMode) {
 236             GLchan *src = (GLchan *) pixels
 237                + (skipRows * rowLength + skipPixels);
 238             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 239                /* no zooming */
 240                GLint row;
 241                ASSERT(drawWidth <= MAX_WIDTH);
 242                for (row=0; row<drawHeight; row++) {
 243                   GLint i;
 244                   for (i=0;i<drawWidth;i++) {
 245                      span.array->rgb[i][0] = src[i];
 246                      span.array->rgb[i][1] = src[i];
 247                      span.array->rgb[i][2] = src[i];
 248                   }
 249                   rb->PutRowRGB(ctx, rb, drawWidth, destX, destY,
 250                                 span.array->rgb, NULL);
 251                   src += rowLength;
 252                   destY++;
 253                }
 254             }
 255             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 256                /* upside-down */
 257                GLint row;
 258                ASSERT(drawWidth <= MAX_WIDTH);
 259                for (row=0; row<drawHeight; row++) {
 260                   GLint i;
 261                   for (i=0;i<drawWidth;i++) {
 262                      span.array->rgb[i][0] = src[i];
 263                      span.array->rgb[i][1] = src[i];
 264                      span.array->rgb[i][2] = src[i];
 265                   }
 266                   destY--;
 267                   rb->PutRow(ctx, rb, drawWidth, destX, destY,
 268                              span.array->rgb, NULL);
 269                   src += rowLength;
 270                }
 271             }
 272             else {
 273                /* with zooming */
 274                GLint row;
 275                ASSERT(drawWidth <= MAX_WIDTH);
 276                for (row=0; row<drawHeight; row++) {
 277                   GLint i;
 278                   for (i=0;i<drawWidth;i++) {
 279                      span.array->rgb[i][0] = src[i];
 280                      span.array->rgb[i][1] = src[i];
 281                      span.array->rgb[i][2] = src[i];
 282                   }
 283                   span.x = destX;
 284                   span.y = destY;
 285                   span.end = drawWidth;
 286                   _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span,
 287                              (CONST GLchan (*)[3]) span.array->rgb);
 288                   src += rowLength;
 289                   destY++;
 290                }
 291             }
 292          }
 293          return GL_TRUE;
 294       }
 295       else if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE
 296                && ctx->_ImageTransferState == 0) {
 297          if (ctx->Visual.rgbMode) {
 298             GLchan *src = (GLchan *) pixels
 299                + (skipRows * rowLength + skipPixels)*2;
 300             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 301                /* no zooming */
 302                GLint row;
 303                ASSERT(drawWidth <= MAX_WIDTH);
 304                for (row=0; row<drawHeight; row++) {
 305                   GLint i;
 306                   GLchan *ptr = src;
 307                   for (i=0;i<drawWidth;i++) {
 308                      span.array->rgba[i][0] = *ptr;
 309                      span.array->rgba[i][1] = *ptr;
 310                      span.array->rgba[i][2] = *ptr++;
 311                      span.array->rgba[i][3] = *ptr++;
 312                   }
 313                   rb->PutRow(ctx, rb, drawWidth, destX, destY,
 314                              span.array->rgba, NULL);
 315                   src += rowLength*2;
 316                   destY++;
 317                }
 318             }
 319             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 320                /* upside-down */
 321                GLint row;
 322                ASSERT(drawWidth <= MAX_WIDTH);
 323                for (row=0; row<drawHeight; row++) {
 324                   GLint i;
 325                   GLchan *ptr = src;
 326                   for (i=0;i<drawWidth;i++) {
 327                      span.array->rgba[i][0] = *ptr;
 328                      span.array->rgba[i][1] = *ptr;
 329                      span.array->rgba[i][2] = *ptr++;
 330                      span.array->rgba[i][3] = *ptr++;
 331                   }
 332                   destY--;
 333                   rb->PutRow(ctx, rb, drawWidth, destX, destY,
 334                              span.array->rgba, NULL);
 335                   src += rowLength*2;
 336                }
 337             }
 338             else {
 339                /* with zooming */
 340                GLint row;
 341                ASSERT(drawWidth <= MAX_WIDTH);
 342                for (row=0; row<drawHeight; row++) {
 343                   GLchan *ptr = src;
 344                   GLint i;
 345                   for (i=0;i<drawWidth;i++) {
 346                      span.array->rgba[i][0] = *ptr;
 347                      span.array->rgba[i][1] = *ptr;
 348                      span.array->rgba[i][2] = *ptr++;
 349                      span.array->rgba[i][3] = *ptr++;
 350                   }
 351                   span.x = destX;
 352                   span.y = destY;
 353                   span.end = drawWidth;
 354                   _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 355                             (CONST GLchan (*)[4]) span.array->rgba);
 356                   src += rowLength*2;
 357                   destY++;
 358                }
 359             }
 360          }
 361          return GL_TRUE;
 362       }
 363       else if (format==GL_COLOR_INDEX && type==GL_UNSIGNED_BYTE) {
 364          GLubyte *src = (GLubyte *) pixels + skipRows * rowLength + skipPixels;
 365          if (ctx->Visual.rgbMode) {
 366             /* convert CI data to RGBA */
 367             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 368                /* no zooming */
 369                GLint row;
 370                for (row=0; row<drawHeight; row++) {
 371                   ASSERT(drawWidth <= MAX_WIDTH);
 372                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
 373                   rb->PutRow(ctx, rb, drawWidth, destX, destY,
 374                              span.array->rgba, NULL);
 375                   src += rowLength;
 376                   destY++;
 377                }
 378                return GL_TRUE;
 379             }
 380             else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
 381                /* upside-down */
 382                GLint row;
 383                for (row=0; row<drawHeight; row++) {
 384                   ASSERT(drawWidth <= MAX_WIDTH);
 385                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
 386                   destY--;
 387                   rb->PutRow(ctx, rb, drawWidth, destX, destY,
 388                              span.array->rgba, NULL);
 389                   src += rowLength;
 390                }
 391                return GL_TRUE;
 392             }
 393             else {
 394                /* with zooming */
 395                GLint row;
 396                for (row=0; row<drawHeight; row++) {
 397                   ASSERT(drawWidth <= MAX_WIDTH);
 398                   _mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
 399                   span.x = destX;
 400                   span.y = destY;
 401                   span.end = drawWidth;
 402                   _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 403                             (CONST GLchan (*)[4]) span.array->rgba);
 404                   src += rowLength;
 405                   destY++;
 406                }
 407                return GL_TRUE;
 408             }
 409          }
 410          else if (ctx->_ImageTransferState==0) {
 411             /* write CI data to CI frame buffer */
 412             GLint row;
 413             if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
 414                /* no zooming */
 415                for (row=0; row<drawHeight; row++) {
 416                   GLuint index32[MAX_WIDTH];
 417                   GLint col;
 418                   for (col = 0; col < drawWidth; col++)
 419                      index32[col] = src[col];
 420                   rb->PutRow(ctx, rb, drawWidth, destX, destY, index32, NULL);
 421                   src += rowLength;
 422                   destY++;
 423                }
 424                return GL_TRUE;
 425             }
 426             else {
 427                /* with zooming */
 428                return GL_FALSE;
 429             }
 430          }
 431       }
 432       else {
 433          /* can't handle this pixel format and/or data type here */
 434          return GL_FALSE;
 435       }
 436    }
 437
 438    /* can't do a simple draw, have to use slow path */
 439    return GL_FALSE;
 440 }
 441
 442
 443
 444 /*
 445  * Draw color index image.
 446  */
 447 static void
 448 draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
 449                    GLsizei width, GLsizei height,
 450                    GLenum type,
 451                    const struct gl_pixelstore_attrib *unpack,
 452                    const GLvoid *pixels )
 453 {
 454    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 455    const GLint imgX = x, imgY = y;
 456    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 457    GLint row, skipPixels;
 458    struct sw_span span;
 459
 460    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
 461
 462    if (ctx->Depth.Test)
 463       _swrast_span_default_z(ctx, &span);
 464    if (swrast->_FogEnabled)
 465       _swrast_span_default_fog(ctx, &span);
 466
 467    /*
 468     * General solution
 469     */
 470    skipPixels = 0;
 471    while (skipPixels < width) {
 472       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 473       ASSERT(spanWidth <= MAX_WIDTH);
 474       for (row = 0; row < height; row++) {
 475          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 476                                                       width, height,
 477                                                       GL_COLOR_INDEX, type,
 478                                                       row, skipPixels);
 479          _mesa_unpack_index_span(ctx, spanWidth, GL_UNSIGNED_INT,
 480                                  span.array->index, type, source, unpack,
 481                                  ctx->_ImageTransferState);
 482
 483          /* These may get changed during writing/clipping */
 484          span.x = x + skipPixels;
 485          span.y = y + row;
 486          span.end = spanWidth;
 487
 488          if (zoom)
 489             _swrast_write_zoomed_index_span(ctx, imgX, imgY, &span);
 490          else
 491             _swrast_write_index_span(ctx, &span);
 492       }
 493       skipPixels += spanWidth;
 494    }
 495 }
 496
 497
 498
 499 /*
 500  * Draw stencil image.
 501  */
 502 static void
 503 draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 504                      GLsizei width, GLsizei height,
 505                      GLenum type,
 506                      const struct gl_pixelstore_attrib *unpack,
 507                      const GLvoid *pixels )
 508 {
 509    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 510    GLint skipPixels;
 511
 512    /* if width > MAX_WIDTH, have to process image in chunks */
 513    skipPixels = 0;
 514    while (skipPixels < width) {
 515       const GLint spanX = x + skipPixels;
 516       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 517       GLint row;
 518       for (row = 0; row < height; row++) {
 519          const GLint spanY = y + row;
 520          GLstencil values[MAX_WIDTH];
 521          GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
 522                          ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 523          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 524                                                       width, height,
 525                                                       GL_COLOR_INDEX, type,
 526                                                       row, skipPixels);
 527          _mesa_unpack_index_span(ctx, spanWidth, destType, values,
 528                                  type, source, unpack,
 529                                  ctx->_ImageTransferState);
 530          if (ctx->_ImageTransferState & IMAGE_SHIFT_OFFSET_BIT) {
 531             _mesa_shift_and_offset_stencil(ctx, spanWidth, values);
 532          }
 533          if (ctx->Pixel.MapStencilFlag) {
 534             _mesa_map_stencil(ctx, spanWidth, values);
 535          }
 536
 537          if (zoom) {
 538             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 539                                               spanX, spanY, values);
 540          }
 541          else {
 542             _swrast_write_stencil_span(ctx, spanWidth, spanX, spanY, values);
 543          }
 544       }
 545       skipPixels += spanWidth;
 546    }
 547 }
 548
 549
 550 /*
 551  * Draw depth image.
 552  */
 553 static void
 554 draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
 555                    GLsizei width, GLsizei height,
 556                    GLenum type,
 557                    const struct gl_pixelstore_attrib *unpack,
 558                    const GLvoid *pixels )
 559 {
 560    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 561    const GLboolean scaleOrBias
 562       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 563    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 564    struct sw_span span;
 565
 566    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
 567
 568    _swrast_span_default_color(ctx, &span);
 569
 570    if (swrast->_FogEnabled)
 571       _swrast_span_default_fog(ctx, &span);
 572    if (ctx->Texture._EnabledCoordUnits)
 573       _swrast_span_default_texcoords(ctx, &span);
 574
 575    if (type == GL_UNSIGNED_SHORT
 576        && ctx->DrawBuffer->Visual.depthBits == 16
 577        && !scaleOrBias
 578        && !zoom
 579        && ctx->Visual.rgbMode
 580        && width <= MAX_WIDTH) {
 581       /* Special case: directly write 16-bit depth values */
 582       GLint row;
 583       for (row = 0; row < height; row++) {
 584          const GLushort *zSrc = (const GLushort *)
 585             _mesa_image_address2d(unpack, pixels, width, height,
 586                                   GL_DEPTH_COMPONENT, type, row, 0);
 587          GLint i;
 588          for (i = 0; i < width; i++)
 589             span.array->z[i] = zSrc[i];
 590          span.x = x;
 591          span.y = y + row;
 592          span.end = width;
 593          _swrast_write_rgba_span(ctx, &span);
 594       }
 595    }
 596    else if (type == GL_UNSIGNED_INT
 597             && !scaleOrBias
 598             && !zoom
 599             && ctx->Visual.rgbMode
 600             && width <= MAX_WIDTH) {
 601       /* Special case: shift 32-bit values down to Visual.depthBits */
 602       const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
 603       GLint row;
 604       for (row = 0; row < height; row++) {
 605          const GLuint *zSrc = (const GLuint *)
 606             _mesa_image_address2d(unpack, pixels, width, height,
 607                                   GL_DEPTH_COMPONENT, type, row, 0);
 608          if (shift == 0) {
 609             _mesa_memcpy(span.array->z, zSrc, width * sizeof(GLuint));
 610          }
 611          else {
 612             GLint col;
 613             for (col = 0; col < width; col++)
 614                span.array->z[col] = zSrc[col] >> shift;
 615          }
 616          span.x = x;
 617          span.y = y + row;
 618          span.end = width;
 619          _swrast_write_rgba_span(ctx, &span);
 620       }
 621    }
 622    else {
 623       /* General case */
 624       const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 625       GLint skipPixels = 0;
 626
 627       /* in case width > MAX_WIDTH do the copy in chunks */
 628       while (skipPixels < width) {
 629          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 630          GLint row;
 631          ASSERT(span.end <= MAX_WIDTH);
 632          for (row = 0; row < height; row++) {
 633             const GLvoid *zSrc = _mesa_image_address2d(unpack,
 634                                                       pixels, width, height,
 635                                                       GL_DEPTH_COMPONENT, type,
 636                                                       row, skipPixels);
 637
 638             /* Set these for each row since the _swrast_write_* function may
 639              * change them while clipping.
 640              */
 641             span.x = x + skipPixels;
 642             span.y = y + row;
 643             span.end = spanWidth;
 644
 645             _mesa_unpack_depth_span(ctx, spanWidth,
 646                                     GL_UNSIGNED_INT, span.array->z, depthMax,
 647                                     type, zSrc, unpack);
 648             if (zoom) {
 649                _swrast_write_zoomed_depth_span(ctx, x, y, &span);
 650             }
 651             else if (ctx->Visual.rgbMode) {
 652                _swrast_write_rgba_span(ctx, &span);
 653             }
 654             else {
 655                _swrast_write_index_span(ctx, &span);
 656             }
 657          }
 658          skipPixels += spanWidth;
 659       }
 660    }
 661 }
 662
 663
 664
 665 /*
 666  * Draw RGBA image.
 667  */
 668 static void
 669 draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 670                   GLsizei width, GLsizei height,
 671                   GLenum format, GLenum type,
 672                   const struct gl_pixelstore_attrib *unpack,
 673                   const GLvoid *pixels )
 674 {
 675    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 676    const GLint imgX = x, imgY = y;
 677    struct gl_renderbuffer *rb = NULL; /* only used for quickDraw path */
 678    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 679    GLboolean quickDraw;
 680    GLfloat *convImage = NULL;
 681    GLuint transferOps = ctx->_ImageTransferState;
 682    struct sw_span span;
 683
 684    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
 685
 686    /* Try an optimized glDrawPixels first */
 687    if (fast_draw_pixels(ctx, x, y, width, height, format, type, unpack, pixels))
 688       return;
 689
 690    if (ctx->Depth.Test)
 691       _swrast_span_default_z(ctx, &span);
 692    if (swrast->_FogEnabled)
 693       _swrast_span_default_fog(ctx, &span);
 694    if (ctx->Texture._EnabledCoordUnits)
 695       _swrast_span_default_texcoords(ctx, &span);
 696
 697    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0 && !zoom && x >= 0 && y >= 0
 698        && x + width <= (GLint) ctx->DrawBuffer->Width
 699        && y + height <= (GLint) ctx->DrawBuffer->Height
 700        && ctx->DrawBuffer->_NumColorDrawBuffers[0] == 1) {
 701       quickDraw = GL_TRUE;
 702       rb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
 703    }
 704    else {
 705       quickDraw = GL_FALSE;
 706       rb = NULL;
 707    }
 708
 709    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 710       /* Convolution has to be handled specially.  We'll create an
 711        * intermediate image, applying all pixel transfer operations
 712        * up to convolution.  Then we'll convolve the image.  Then
 713        * we'll proceed with the rest of the transfer operations and
 714        * rasterize the image.
 715        */
 716       GLint row;
 717       GLfloat *dest, *tmpImage;
 718
 719       tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 720       if (!tmpImage) {
 721          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 722          return;
 723       }
 724       convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 725       if (!convImage) {
 726          _mesa_free(tmpImage);
 727          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 728          return;
 729       }
 730
 731       /* Unpack the image and apply transfer ops up to convolution */
 732       dest = tmpImage;
 733       for (row = 0; row < height; row++) {
 734          const GLvoid *source = _mesa_image_address2d(unpack,
 735                                   pixels, width, height, format, type, row, 0);
 736          _mesa_unpack_color_span_float(ctx, width, GL_RGBA, (GLfloat *) dest,
 737                                      format, type, source, unpack,
 738                                      transferOps & IMAGE_PRE_CONVOLUTION_BITS);
 739          dest += width * 4;
 740       }
 741
 742       /* do convolution */
 743       if (ctx->Pixel.Convolution2DEnabled) {
 744          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 745       }
 746       else {
 747          ASSERT(ctx->Pixel.Separable2DEnabled);
 748          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 749       }
 750       _mesa_free(tmpImage);
 751
 752       /* continue transfer ops and draw the convolved image */
 753       unpack = &ctx->DefaultPacking;
 754       pixels = convImage;
 755       format = GL_RGBA;
 756       type = GL_FLOAT;
 757       transferOps &= IMAGE_POST_CONVOLUTION_BITS;
 758    }
 759
 760    /*
 761     * General solution
 762     */
 763    {
 764       const GLbitfield interpMask = span.interpMask;
 765       const GLbitfield arrayMask = span.arrayMask;
 766       GLint skipPixels = 0;
 767
 768       /* if the span is wider than MAX_WIDTH we have to do it in chunks */
 769       while (skipPixels < width) {
 770          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 771          GLint row;
 772
 773          ASSERT(span.end <= MAX_WIDTH);
 774
 775          for (row = 0; row < height; row++) {
 776             const GLvoid *source = _mesa_image_address2d(unpack,
 777                      pixels, width, height, format, type, row, skipPixels);
 778
 779             /* Set these for each row since the _swrast_write_* function may
 780              * change them while clipping.
 781              */
 782             span.x = x + skipPixels;
 783             span.y = y + row;
 784             span.end = spanWidth;
 785             span.arrayMask = arrayMask;
 786             span.interpMask = interpMask;
 787
 788             _mesa_unpack_color_span_chan(ctx, spanWidth, GL_RGBA,
 789                                          (GLchan *) span.array->rgba,
 790                                          format, type, source, unpack,
 791                                          transferOps);
 792
 793             if ((ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink) ||
 794                 (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink))
 795                continue;
 796
 797             /* draw the span */
 798             if (quickDraw) {
 799                rb->PutRow(ctx, rb, span.end, span.x, span.y,
 800                           span.array->rgba, NULL);
 801             }
 802             else if (zoom) {
 803                _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 804                                        (CONST GLchan (*)[4]) span.array->rgba);
 805             }
 806             else {
 807                _swrast_write_rgba_span(ctx, &span);
 808             }
 809          }
 810
 811          skipPixels += spanWidth;
 812       }
 813    }
 814
 815    if (convImage) {
 816       _mesa_free(convImage);
 817    }
 818 }
 819
 820
 821 /**
 822  * This is a bit different from drawing GL_DEPTH_COMPONENT pixels.
 823  * The only per-pixel operations that apply are depth scale/bias,
 824  * stencil offset/shift, GL_DEPTH_WRITEMASK and GL_STENCIL_WRITEMASK,
 825  * and pixel zoom.
 826  * Also, only the depth buffer and stencil buffers are touched, not the
 827  * color buffer(s).
 828  */
 829 static void
 830 draw_depth_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 831                           GLsizei width, GLsizei height, GLenum type,
 832                           const struct gl_pixelstore_attrib *unpack,
 833                           const GLvoid *pixels)
 834 {
 835    const GLint imgX = x, imgY = y;
 836    const GLboolean scaleOrBias =
 837       ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 838    const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
 839    const GLuint stencilMask = ctx->Stencil.WriteMask[0];
 840    const GLuint stencilType = (STENCIL_BITS == 8) ?
 841       GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 842    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 843    struct gl_renderbuffer *depthRb, *stencilRb;
 844    struct gl_pixelstore_attrib clippedUnpack = *unpack;
 845
 846    if (!zoom) {
 847       if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
 848                                  &clippedUnpack)) {
 849          /* totally clipped */
 850          return;
 851       }
 852    }
 853
 854    depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 855    stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 856    ASSERT(depthRb);
 857    ASSERT(stencilRb);
 858
 859    if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 860        stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 861        depthRb == stencilRb &&
 862        !scaleOrBias &&
 863        !zoom &&
 864        ctx->Depth.Mask &&
 865        (stencilMask & 0xff) == 0xff) {
 866       /* This is the ideal case.
 867        * Drawing GL_DEPTH_STENCIL pixels into a combined depth/stencil buffer.
 868        * Plus, no pixel transfer ops, zooming, or masking needed.
 869        */
 870       GLint i;
 871       for (i = 0; i < height; i++) {
 872          const GLuint *src = (const GLuint *)
 873             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 874                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 875          depthRb->PutRow(ctx, depthRb, width, x, y + i, src, NULL);
 876       }
 877    }
 878    else {
 879       /* sub-optimal cases:
 880        * Separate depth/stencil buffers, or pixel transfer ops required.
 881        */
 882       /* XXX need to handle very wide images (skippixels) */
 883       GLint i;
 884
 885       depthRb = ctx->DrawBuffer->_DepthBuffer;
 886       stencilRb = ctx->DrawBuffer->_StencilBuffer;
 887
 888       for (i = 0; i < height; i++) {
 889          const GLuint *depthStencilSrc = (const GLuint *)
 890             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 891                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 892
 893          if (ctx->Depth.Mask) {
 894             if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 24) {
 895                /* fast path 24-bit zbuffer */
 896                GLuint zValues[MAX_WIDTH];
 897                GLint j;
 898                ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
 899                for (j = 0; j < width; j++) {
 900                   zValues[j] = depthStencilSrc[j] >> 8;
 901                }
 902                if (zoom)
 903                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
 904                                               x, y + i, zValues);
 905                else
 906                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 907             }
 908             else if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 16) {
 909                /* fast path 16-bit zbuffer */
 910                GLushort zValues[MAX_WIDTH];
 911                GLint j;
 912                ASSERT(depthRb->DataType == GL_UNSIGNED_SHORT);
 913                for (j = 0; j < width; j++) {
 914                   zValues[j] = depthStencilSrc[j] >> 16;
 915                }
 916                if (zoom)
 917                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
 918                                               x, y + i, zValues);
 919                else
 920                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 921             }
 922             else {
 923                /* general case */
 924                GLuint zValues[MAX_WIDTH];  /* 16 or 32-bit Z value storage */
 925                _mesa_unpack_depth_span(ctx, width,
 926                                        depthRb->DataType, zValues, depthScale,
 927                                        type, depthStencilSrc, &clippedUnpack);
 928                if (zoom) {
 929                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width, x,
 930                                               y + i, zValues);
 931                }
 932                else {
 933                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 934                }
 935             }
 936          }
 937
 938          if (stencilMask != 0x0) {
 939             GLstencil stencilValues[MAX_WIDTH];
 940             /* get stencil values, with shift/offset/mapping */
 941             _mesa_unpack_stencil_span(ctx, width, stencilType, stencilValues,
 942                                       type, depthStencilSrc, &clippedUnpack,
 943                                       ctx->_ImageTransferState);
 944             if (zoom)
 945                _swrast_write_zoomed_stencil_span(ctx, imgX, imgY, width,
 946                                                   x, y + i, stencilValues);
 947             else
 948                _swrast_write_stencil_span(ctx, width, x, y + i, stencilValues);
 949          }
 950       }
 951    }
 952 }
 953
 954
 955
 956 /**
 957  * Execute software-based glDrawPixels.
 958  * By time we get here, all error checking will have been done.
 959  */
 960 void
 961 _swrast_DrawPixels( GLcontext *ctx,
 962                     GLint x, GLint y,
 963                     GLsizei width, GLsizei height,
 964                     GLenum format, GLenum type,
 965                     const struct gl_pixelstore_attrib *unpack,
 966                     const GLvoid *pixels )
 967 {
 968    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 969
 970    if (swrast->NewState)
 971       _swrast_validate_derived( ctx );
 972
 973    if (unpack->BufferObj->Name) {
 974       /* unpack from PBO */
 975       GLubyte *buf;
 976       if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
 977                                      format, type, pixels)) {
 978          _mesa_error(ctx, GL_INVALID_OPERATION,
 979                      "glDrawPixels(invalid PBO access)");
 980          return;
 981       }
 982       buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
 983                                               GL_READ_ONLY_ARB,
 984                                               unpack->BufferObj);
 985       if (!buf) {
 986          /* buffer is already mapped - that's an error */
 987          _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawPixels(PBO is mapped)");
 988          return;
 989       }
 990       pixels = ADD_POINTERS(buf, pixels);
 991    }
 992
 993    RENDER_START(swrast,ctx);
 994
 995    switch (format) {
 996    case GL_STENCIL_INDEX:
 997       draw_stencil_pixels( ctx, x, y, width, height, type, unpack, pixels );
 998       break;
 999    case GL_DEPTH_COMPONENT:
1000       draw_depth_pixels( ctx, x, y, width, height, type, unpack, pixels );
1001       break;
1002    case GL_COLOR_INDEX:
1003       if (ctx->Visual.rgbMode)
1004          draw_rgba_pixels(ctx, x,y, width, height, format, type, unpack, pixels);
1005       else
1006          draw_index_pixels(ctx, x, y, width, height, type, unpack, pixels);
1007       break;
1008    case GL_RED:
1009    case GL_GREEN:
1010    case GL_BLUE:
1011    case GL_ALPHA:
1012    case GL_LUMINANCE:
1013    case GL_LUMINANCE_ALPHA:
1014    case GL_RGB:
1015    case GL_BGR:
1016    case GL_RGBA:
1017    case GL_BGRA:
1018    case GL_ABGR_EXT:
1019       draw_rgba_pixels(ctx, x, y, width, height, format, type, unpack, pixels);
1020       break;
1021    case GL_DEPTH_STENCIL_EXT:
1022       draw_depth_stencil_pixels(ctx, x, y, width, height,
1023                                 type, unpack, pixels);
1024       break;
1025    default:
1026       _mesa_problem(ctx, "unexpected format in _swrast_DrawPixels");
1027       /* don't return yet, clean-up */
1028    }
1029
1030    RENDER_FINISH(swrast,ctx);
1031
1032    if (unpack->BufferObj->Name) {
1033       /* done with PBO so unmap it now */
1034       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
1035                               unpack->BufferObj);
1036    }
1037 }
1038
1039
1040
1041 #if 0  /* experimental */
1042 /*
1043  * Execute glDrawDepthPixelsMESA().
1044  */
1045 void
1046 _swrast_DrawDepthPixelsMESA( GLcontext *ctx,
1047                              GLint x, GLint y,
1048                              GLsizei width, GLsizei height,
1049                              GLenum colorFormat, GLenum colorType,
1050                              const GLvoid *colors,
1051                              GLenum depthType, const GLvoid *depths,
1052                              const struct gl_pixelstore_attrib *unpack )
1053 {
1054    SWcontext *swrast = SWRAST_CONTEXT(ctx);
1055
1056    if (swrast->NewState)
1057       _swrast_validate_derived( ctx );
1058
1059    RENDER_START(swrast,ctx);
1060
1061    switch (colorFormat) {
1062    case GL_COLOR_INDEX:
1063       if (ctx->Visual.rgbMode)
1064          draw_rgba_pixels(ctx, x,y, width, height, colorFormat, colorType,
1065                           unpack, colors);
1066       else
1067          draw_index_pixels(ctx, x, y, width, height, colorType,
1068                            unpack, colors);
1069       break;
1070    case GL_RED:
1071    case GL_GREEN:
1072    case GL_BLUE:
1073    case GL_ALPHA:
1074    case GL_LUMINANCE:
1075    case GL_LUMINANCE_ALPHA:
1076    case GL_RGB:
1077    case GL_BGR:
1078    case GL_RGBA:
1079    case GL_BGRA:
1080    case GL_ABGR_EXT:
1081       draw_rgba_pixels(ctx, x, y, width, height, colorFormat, colorType,
1082                        unpack, colors);
1083       break;
1084    default:
1085       _mesa_problem(ctx, "unexpected format in glDrawDepthPixelsMESA");
1086    }
1087
1088    RENDER_FINISH(swrast,ctx);
1089 }
1090 #endif