src/mesa/swrast/s_readpix.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.0.3
   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 #include "main/glheader.h"
  27 #include "main/bufferobj.h"
  28 #include "main/colormac.h"
  29 #include "main/convolve.h"
  30 #include "main/context.h"
  31 #include "main/feedback.h"
  32 #include "main/formats.h"
  33 #include "main/image.h"
  34 #include "main/macros.h"
  35 #include "main/imports.h"
  36 #include "main/state.h"
  37
  38 #include "s_context.h"
  39 #include "s_depth.h"
  40 #include "s_span.h"
  41 #include "s_stencil.h"
  42
  43
  44 /**
  45  * Read pixels for format=GL_DEPTH_COMPONENT.
  46  */
  47 static void
  48 read_depth_pixels( GLcontext *ctx,
  49                    GLint x, GLint y,
  50                    GLsizei width, GLsizei height,
  51                    GLenum type, GLvoid *pixels,
  52                    const struct gl_pixelstore_attrib *packing )
  53 {
  54    struct gl_framebuffer *fb = ctx->ReadBuffer;
  55    struct gl_renderbuffer *rb = fb->_DepthBuffer;
  56    const GLboolean biasOrScale
  57       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
  58
  59    if (!rb)
  60       return;
  61
  62    /* clipping should have been done already */
  63    ASSERT(x >= 0);
  64    ASSERT(y >= 0);
  65    ASSERT(x + width <= (GLint) rb->Width);
  66    ASSERT(y + height <= (GLint) rb->Height);
  67    /* width should never be > MAX_WIDTH since we did clipping earlier */
  68    ASSERT(width <= MAX_WIDTH);
  69
  70    if (type == GL_UNSIGNED_SHORT && fb->Visual.depthBits == 16
  71        && !biasOrScale && !packing->SwapBytes) {
  72       /* Special case: directly read 16-bit unsigned depth values. */
  73       GLint j;
  74       ASSERT(rb->Format == MESA_FORMAT_Z16);
  75       ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
  76       for (j = 0; j < height; j++, y++) {
  77          void *dest =_mesa_image_address2d(packing, pixels, width, height,
  78                                            GL_DEPTH_COMPONENT, type, j, 0);
  79          rb->GetRow(ctx, rb, width, x, y, dest);
  80       }
  81    }
  82    else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 24
  83             && !biasOrScale && !packing->SwapBytes) {
  84       /* Special case: directly read 24-bit unsigned depth values. */
  85       GLint j;
  86       ASSERT(rb->Format == MESA_FORMAT_X8_Z24 ||
  87              rb->Format == MESA_FORMAT_S8_Z24 ||
  88              rb->Format == MESA_FORMAT_Z24_X8 ||
  89              rb->Format == MESA_FORMAT_Z24_S8);
  90       ASSERT(rb->DataType == GL_UNSIGNED_INT ||
  91              rb->DataType == GL_UNSIGNED_INT_24_8);
  92       for (j = 0; j < height; j++, y++) {
  93          GLuint *dest = (GLuint *)
  94             _mesa_image_address2d(packing, pixels, width, height,
  95                                   GL_DEPTH_COMPONENT, type, j, 0);
  96          GLint k;
  97          rb->GetRow(ctx, rb, width, x, y, dest);
  98          /* convert range from 24-bit to 32-bit */
  99          if (rb->Format == MESA_FORMAT_X8_Z24 ||
 100              rb->Format == MESA_FORMAT_S8_Z24) {
 101             for (k = 0; k < width; k++) {
 102                /* Note: put MSByte of 24-bit value into LSByte */
 103                dest[k] = (dest[k] << 8) | ((dest[k] >> 16) & 0xff);
 104             }
 105          }
 106          else {
 107             for (k = 0; k < width; k++) {
 108                /* Note: fill in LSByte by replication */
 109                dest[k] = dest[k] | ((dest[k] >> 8) & 0xff);
 110             }
 111          }
 112       }
 113    }
 114    else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 32
 115             && !biasOrScale && !packing->SwapBytes) {
 116       /* Special case: directly read 32-bit unsigned depth values. */
 117       GLint j;
 118       ASSERT(rb->Format == MESA_FORMAT_Z32);
 119       ASSERT(rb->DataType == GL_UNSIGNED_INT);
 120       for (j = 0; j < height; j++, y++) {
 121          void *dest = _mesa_image_address2d(packing, pixels, width, height,
 122                                             GL_DEPTH_COMPONENT, type, j, 0);
 123          rb->GetRow(ctx, rb, width, x, y, dest);
 124       }
 125    }
 126    else {
 127       /* General case (slower) */
 128       GLint j;
 129       for (j = 0; j < height; j++, y++) {
 130          GLfloat depthValues[MAX_WIDTH];
 131          GLvoid *dest = _mesa_image_address2d(packing, pixels, width, height,
 132                                               GL_DEPTH_COMPONENT, type, j, 0);
 133          _swrast_read_depth_span_float(ctx, rb, width, x, y, depthValues);
 134          _mesa_pack_depth_span(ctx, width, dest, type, depthValues, packing);
 135       }
 136    }
 137 }
 138
 139
 140 /**
 141  * Read pixels for format=GL_STENCIL_INDEX.
 142  */
 143 static void
 144 read_stencil_pixels( GLcontext *ctx,
 145                      GLint x, GLint y,
 146                      GLsizei width, GLsizei height,
 147                      GLenum type, GLvoid *pixels,
 148                      const struct gl_pixelstore_attrib *packing )
 149 {
 150    struct gl_framebuffer *fb = ctx->ReadBuffer;
 151    struct gl_renderbuffer *rb = fb->_StencilBuffer;
 152    GLint j;
 153
 154    if (!rb)
 155       return;
 156
 157    /* width should never be > MAX_WIDTH since we did clipping earlier */
 158    ASSERT(width <= MAX_WIDTH);
 159
 160    /* process image row by row */
 161    for (j=0;j<height;j++,y++) {
 162       GLvoid *dest;
 163       GLstencil stencil[MAX_WIDTH];
 164
 165       _swrast_read_stencil_span(ctx, rb, width, x, y, stencil);
 166
 167       dest = _mesa_image_address2d(packing, pixels, width, height,
 168                                    GL_STENCIL_INDEX, type, j, 0);
 169
 170       _mesa_pack_stencil_span(ctx, width, type, dest, stencil, packing);
 171    }
 172 }
 173
 174
 175
 176 /**
 177  * Optimized glReadPixels for particular pixel formats when pixel
 178  * scaling, biasing, mapping, etc. are disabled.
 179  * \return GL_TRUE if success, GL_FALSE if unable to do the readpixels
 180  */
 181 static GLboolean
 182 fast_read_rgba_pixels( GLcontext *ctx,
 183                        GLint x, GLint y,
 184                        GLsizei width, GLsizei height,
 185                        GLenum format, GLenum type,
 186                        GLvoid *pixels,
 187                        const struct gl_pixelstore_attrib *packing,
 188                        GLbitfield transferOps)
 189 {
 190    struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
 191
 192    if (!rb)
 193       return GL_FALSE;
 194
 195    ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB);
 196
 197    /* clipping should have already been done */
 198    ASSERT(x + width <= (GLint) rb->Width);
 199    ASSERT(y + height <= (GLint) rb->Height);
 200
 201    /* check for things we can't handle here */
 202    if (transferOps ||
 203        packing->SwapBytes ||
 204        packing->LsbFirst) {
 205       return GL_FALSE;
 206    }
 207
 208    if (format == GL_RGBA && rb->DataType == type) {
 209       const GLint dstStride = _mesa_image_row_stride(packing, width,
 210                                                      format, type);
 211       GLubyte *dest
 212          = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
 213                                              format, type, 0, 0);
 214       GLint row;
 215       ASSERT(rb->GetRow);
 216       for (row = 0; row < height; row++) {
 217          rb->GetRow(ctx, rb, width, x, y + row, dest);
 218          dest += dstStride;
 219       }
 220       return GL_TRUE;
 221    }
 222
 223    if (format == GL_RGB &&
 224        rb->DataType == GL_UNSIGNED_BYTE &&
 225        type == GL_UNSIGNED_BYTE) {
 226       const GLint dstStride = _mesa_image_row_stride(packing, width,
 227                                                      format, type);
 228       GLubyte *dest
 229          = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
 230                                              format, type, 0, 0);
 231       GLint row;
 232       ASSERT(rb->GetRow);
 233       for (row = 0; row < height; row++) {
 234          GLubyte tempRow[MAX_WIDTH][4];
 235          GLint col;
 236          rb->GetRow(ctx, rb, width, x, y + row, tempRow);
 237          /* convert RGBA to RGB */
 238          for (col = 0; col < width; col++) {
 239             dest[col * 3 + 0] = tempRow[col][0];
 240             dest[col * 3 + 1] = tempRow[col][1];
 241             dest[col * 3 + 2] = tempRow[col][2];
 242          }
 243          dest += dstStride;
 244       }
 245       return GL_TRUE;
 246    }
 247
 248    /* not handled */
 249    return GL_FALSE;
 250 }
 251
 252
 253 /**
 254  * When we're using a low-precision color buffer (like 16-bit 5/6/5)
 255  * we have to adjust our color values a bit to pass conformance.
 256  * The problem is when a 5 or 6-bit color value is converted to an 8-bit
 257  * value and then a floating point value, the floating point values don't
 258  * increment uniformly as the 5 or 6-bit value is incremented.
 259  *
 260  * This function adjusts floating point values to compensate.
 261  */
 262 static void
 263 adjust_colors(const struct gl_framebuffer *fb, GLuint n, GLfloat rgba[][4])
 264 {
 265    const GLuint rShift = 8 - fb->Visual.redBits;
 266    const GLuint gShift = 8 - fb->Visual.greenBits;
 267    const GLuint bShift = 8 - fb->Visual.blueBits;
 268    const GLfloat rScale = 1.0F / (GLfloat) ((1 << fb->Visual.redBits  ) - 1);
 269    const GLfloat gScale = 1.0F / (GLfloat) ((1 << fb->Visual.greenBits) - 1);
 270    const GLfloat bScale = 1.0F / (GLfloat) ((1 << fb->Visual.blueBits ) - 1);
 271    GLuint i;
 272    for (i = 0; i < n; i++) {
 273       GLint r, g, b;
 274       /* convert float back to ubyte */
 275       CLAMPED_FLOAT_TO_UBYTE(r, rgba[i][RCOMP]);
 276       CLAMPED_FLOAT_TO_UBYTE(g, rgba[i][GCOMP]);
 277       CLAMPED_FLOAT_TO_UBYTE(b, rgba[i][BCOMP]);
 278       /* using only the N most significant bits of the ubyte value, convert to
 279        * float in [0,1].
 280        */
 281       rgba[i][RCOMP] = (GLfloat) (r >> rShift) * rScale;
 282       rgba[i][GCOMP] = (GLfloat) (g >> gShift) * gScale;
 283       rgba[i][BCOMP] = (GLfloat) (b >> bShift) * bScale;
 284    }
 285 }
 286
 287
 288
 289 /*
 290  * Read R, G, B, A, RGB, L, or LA pixels.
 291  */
 292 static void
 293 read_rgba_pixels( GLcontext *ctx,
 294                   GLint x, GLint y,
 295                   GLsizei width, GLsizei height,
 296                   GLenum format, GLenum type, GLvoid *pixels,
 297                   const struct gl_pixelstore_attrib *packing )
 298 {
 299    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 300    GLbitfield transferOps = ctx->_ImageTransferState;
 301    struct gl_framebuffer *fb = ctx->ReadBuffer;
 302    struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
 303
 304    if (!rb)
 305       return;
 306
 307    if (type == GL_FLOAT && ((ctx->Color.ClampReadColor == GL_TRUE) ||
 308                             (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB &&
 309                              rb->DataType != GL_FLOAT)))
 310       transferOps |= IMAGE_CLAMP_BIT;
 311
 312    /* Try optimized path first */
 313    if (fast_read_rgba_pixels(ctx, x, y, width, height,
 314                              format, type, pixels, packing, transferOps)) {
 315       return; /* done! */
 316    }
 317
 318    /* width should never be > MAX_WIDTH since we did clipping earlier */
 319    ASSERT(width <= MAX_WIDTH);
 320
 321    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 322       GLfloat *dest, *src, *tmpImage, *convImage;
 323       GLint row;
 324
 325       tmpImage = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 326       if (!tmpImage) {
 327          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
 328          return;
 329       }
 330       convImage = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 331       if (!convImage) {
 332          free(tmpImage);
 333          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
 334          return;
 335       }
 336
 337       /* read full RGBA, FLOAT image */
 338       dest = tmpImage;
 339       for (row = 0; row < height; row++, y++) {
 340          _swrast_read_rgba_span(ctx, rb, width, x, y, GL_FLOAT, dest);
 341          _mesa_apply_rgba_transfer_ops(ctx,
 342                                       transferOps & IMAGE_PRE_CONVOLUTION_BITS,
 343                                       width, (GLfloat (*)[4]) dest);
 344          dest += width * 4;
 345       }
 346
 347       /* do convolution */
 348       if (ctx->Pixel.Convolution2DEnabled) {
 349          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 350       }
 351       else {
 352          ASSERT(ctx->Pixel.Separable2DEnabled);
 353          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 354       }
 355       free(tmpImage);
 356
 357       /* finish transfer ops and pack the resulting image */
 358       src = convImage;
 359       for (row = 0; row < height; row++) {
 360          GLvoid *dest;
 361          dest = _mesa_image_address2d(packing, pixels, width, height,
 362                                       format, type, row, 0);
 363          _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) src,
 364                                     format, type, dest, packing,
 365                                     transferOps & IMAGE_POST_CONVOLUTION_BITS);
 366          src += width * 4;
 367       }
 368       free(convImage);
 369    }
 370    else {
 371       /* no convolution */
 372       const GLint dstStride
 373          = _mesa_image_row_stride(packing, width, format, type);
 374       GLfloat (*rgba)[4] = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 375       GLint row;
 376       GLubyte *dst
 377          = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
 378                                              format, type, 0, 0);
 379
 380       /* make sure we don't apply 1D convolution */
 381       transferOps &= ~(IMAGE_CONVOLUTION_BIT |
 382                        IMAGE_POST_CONVOLUTION_SCALE_BIAS);
 383
 384       for (row = 0; row < height; row++, y++) {
 385
 386          /* Get float rgba pixels */
 387          _swrast_read_rgba_span(ctx, rb, width, x, y, GL_FLOAT, rgba);
 388
 389          /* apply fudge factor for shallow color buffers */
 390          if (fb->Visual.redBits < 8 ||
 391              fb->Visual.greenBits < 8 ||
 392              fb->Visual.blueBits < 8) {
 393             adjust_colors(fb, width, rgba);
 394          }
 395
 396          /* pack the row of RGBA pixels into user's buffer */
 397          _mesa_pack_rgba_span_float(ctx, width, rgba, format, type, dst,
 398                                     packing, transferOps);
 399
 400          dst += dstStride;
 401       }
 402    }
 403 }
 404
 405
 406 /**
 407  * Read combined depth/stencil values.
 408  * We'll have already done error checking to be sure the expected
 409  * depth and stencil buffers really exist.
 410  */
 411 static void
 412 read_depth_stencil_pixels(GLcontext *ctx,
 413                           GLint x, GLint y,
 414                           GLsizei width, GLsizei height,
 415                           GLenum type, GLvoid *pixels,
 416                           const struct gl_pixelstore_attrib *packing )
 417 {
 418    const GLboolean scaleOrBias
 419       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 420    const GLboolean stencilTransfer = ctx->Pixel.IndexShift
 421       || ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag;
 422    struct gl_renderbuffer *depthRb, *stencilRb;
 423
 424    depthRb = ctx->ReadBuffer->_DepthBuffer;
 425    stencilRb = ctx->ReadBuffer->_StencilBuffer;
 426
 427    if (!depthRb || !stencilRb)
 428       return;
 429
 430    depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 431    stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 432
 433    if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 434        stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 435        depthRb == stencilRb &&
 436        !scaleOrBias &&
 437        !stencilTransfer) {
 438       /* This is the ideal case.
 439        * Reading GL_DEPTH_STENCIL pixels from combined depth/stencil buffer.
 440        * Plus, no pixel transfer ops to worry about!
 441        */
 442       GLint i;
 443       GLint dstStride = _mesa_image_row_stride(packing, width,
 444                                                GL_DEPTH_STENCIL_EXT, type);
 445       GLubyte *dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
 446                                                        width, height,
 447                                                        GL_DEPTH_STENCIL_EXT,
 448                                                        type, 0, 0);
 449       for (i = 0; i < height; i++) {
 450          depthRb->GetRow(ctx, depthRb, width, x, y + i, dst);
 451          dst += dstStride;
 452       }
 453    }
 454    else {
 455       /* Reading GL_DEPTH_STENCIL pixels from separate depth/stencil buffers,
 456        * or we need pixel transfer.
 457        */
 458       GLint i;
 459       depthRb = ctx->ReadBuffer->_DepthBuffer;
 460       stencilRb = ctx->ReadBuffer->_StencilBuffer;
 461
 462       for (i = 0; i < height; i++) {
 463          GLstencil stencilVals[MAX_WIDTH];
 464
 465          GLuint *depthStencilDst = (GLuint *)
 466             _mesa_image_address2d(packing, pixels, width, height,
 467                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 468
 469          _swrast_read_stencil_span(ctx, stencilRb, width,
 470                                    x, y + i, stencilVals);
 471
 472          if (!scaleOrBias && !stencilTransfer
 473              && ctx->ReadBuffer->Visual.depthBits == 24) {
 474             /* ideal case */
 475             GLuint zVals[MAX_WIDTH]; /* 24-bit values! */
 476             GLint j;
 477             ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
 478             /* note, we've already been clipped */
 479             depthRb->GetRow(ctx, depthRb, width, x, y + i, zVals);
 480             for (j = 0; j < width; j++) {
 481                depthStencilDst[j] = (zVals[j] << 8) | (stencilVals[j] & 0xff);
 482             }
 483          }
 484          else {
 485             /* general case */
 486             GLfloat depthVals[MAX_WIDTH];
 487             _swrast_read_depth_span_float(ctx, depthRb, width, x, y + i,
 488                                           depthVals);
 489             _mesa_pack_depth_stencil_span(ctx, width, depthStencilDst,
 490                                           depthVals, stencilVals, packing);
 491          }
 492       }
 493    }
 494 }
 495
 496
 497
 498 /**
 499  * Software fallback routine for ctx->Driver.ReadPixels().
 500  * By time we get here, all error checking will have been done.
 501  */
 502 void
 503 _swrast_ReadPixels( GLcontext *ctx,
 504                     GLint x, GLint y, GLsizei width, GLsizei height,
 505                     GLenum format, GLenum type,
 506                     const struct gl_pixelstore_attrib *packing,
 507                     GLvoid *pixels )
 508 {
 509    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 510    struct gl_pixelstore_attrib clippedPacking = *packing;
 511
 512    if (ctx->NewState)
 513       _mesa_update_state(ctx);
 514
 515    /* Need to do swrast_render_start() before clipping or anything else
 516     * since this is where a driver may grab the hw lock and get an updated
 517     * window size.
 518     */
 519    swrast_render_start(ctx);
 520
 521    if (swrast->NewState)
 522       _swrast_validate_derived( ctx );
 523
 524    /* Do all needed clipping here, so that we can forget about it later */
 525    if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
 526       /* The ReadPixels region is totally outside the window bounds */
 527       swrast_render_finish(ctx);
 528       return;
 529    }
 530
 531    pixels = _mesa_map_pbo_dest(ctx, &clippedPacking, pixels);
 532    if (!pixels)
 533       return;
 534
 535    switch (format) {
 536       case GL_STENCIL_INDEX:
 537          read_stencil_pixels(ctx, x, y, width, height, type, pixels,
 538                              &clippedPacking);
 539          break;
 540       case GL_DEPTH_COMPONENT:
 541          read_depth_pixels(ctx, x, y, width, height, type, pixels,
 542                            &clippedPacking);
 543          break;
 544       case GL_RED:
 545       case GL_GREEN:
 546       case GL_BLUE:
 547       case GL_ALPHA:
 548       case GL_RGB:
 549       case GL_LUMINANCE:
 550       case GL_LUMINANCE_ALPHA:
 551       case GL_RGBA:
 552       case GL_BGR:
 553       case GL_BGRA:
 554       case GL_ABGR_EXT:
 555          read_rgba_pixels(ctx, x, y, width, height,
 556                           format, type, pixels, &clippedPacking);
 557          break;
 558       case GL_DEPTH_STENCIL_EXT:
 559          read_depth_stencil_pixels(ctx, x, y, width, height,
 560                                    type, pixels, &clippedPacking);
 561          break;
 562       default:
 563          _mesa_problem(ctx, "unexpected format in _swrast_ReadPixels");
 564          /* don't return yet, clean-up */
 565    }
 566
 567    swrast_render_finish(ctx);
 568
 569    _mesa_unmap_pbo_dest(ctx, &clippedPacking);
 570 }