src/mesa/swrast/s_drawpix.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   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 "bufferobj.h"
  28 #include "main/context.h"
  29 #include "convolve.h"
  30 #include "image.h"
  31 #include "main/macros.h"
  32 #include "main/imports.h"
  33 #include "pixel.h"
  34 #include "state.h"
  35
  36 #include "s_context.h"
  37 #include "s_drawpix.h"
  38 #include "s_span.h"
  39 #include "s_stencil.h"
  40 #include "s_zoom.h"
  41
  42
  43
  44 /**
  45  * Try to do a fast and simple RGB(a) glDrawPixels.
  46  * Return:  GL_TRUE if success, GL_FALSE if slow path must be used instead
  47  */
  48 static GLboolean
  49 fast_draw_rgba_pixels(GLcontext *ctx, GLint x, GLint y,
  50                       GLsizei width, GLsizei height,
  51                       GLenum format, GLenum type,
  52                       const struct gl_pixelstore_attrib *userUnpack,
  53                       const GLvoid *pixels)
  54 {
  55    const GLint imgX = x, imgY = y;
  56    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
  57    GLenum rbType;
  58    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  59    SWspan span;
  60    GLboolean simpleZoom;
  61    GLint yStep;  /* +1 or -1 */
  62    struct gl_pixelstore_attrib unpack;
  63    GLint destX, destY, drawWidth, drawHeight; /* post clipping */
  64
  65    if (!rb)
  66       return GL_TRUE; /* no-op */
  67
  68    rbType = rb->DataType;
  69
  70    if ((swrast->_RasterMask & ~CLIP_BIT) ||
  71        ctx->Texture._EnabledCoordUnits ||
  72        userUnpack->SwapBytes ||
  73        ctx->_ImageTransferState) {
  74       /* can't handle any of those conditions */
  75       return GL_FALSE;
  76    }
  77
  78    INIT_SPAN(span, GL_BITMAP);
  79    span.arrayMask = SPAN_RGBA;
  80    span.arrayAttribs = FRAG_BIT_COL0;
  81    _swrast_span_default_attribs(ctx, &span);
  82
  83    /* copy input params since clipping may change them */
  84    unpack = *userUnpack;
  85    destX = x;
  86    destY = y;
  87    drawWidth = width;
  88    drawHeight = height;
  89
  90    /* check for simple zooming and clipping */
  91    if (ctx->Pixel.ZoomX == 1.0F &&
  92        (ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F)) {
  93       if (!_mesa_clip_drawpixels(ctx, &destX, &destY,
  94                                  &drawWidth, &drawHeight, &unpack)) {
  95          /* image was completely clipped: no-op, all done */
  96          return GL_TRUE;
  97       }
  98       simpleZoom = GL_TRUE;
  99       yStep = (GLint) ctx->Pixel.ZoomY;
 100       ASSERT(yStep == 1 || yStep == -1);
 101    }
 102    else {
 103       /* non-simple zooming */
 104       simpleZoom = GL_FALSE;
 105       yStep = 1;
 106       if (unpack.RowLength == 0)
 107          unpack.RowLength = width;
 108    }
 109
 110    /*
 111     * Ready to draw!
 112     */
 113
 114    if (format == GL_RGBA && type == rbType) {
 115       const GLubyte *src
 116          = (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
 117                                                    height, format, type, 0, 0);
 118       const GLint srcStride = _mesa_image_row_stride(&unpack, width,
 119                                                      format, type);
 120       if (simpleZoom) {
 121          GLint row;
 122          for (row = 0; row < drawHeight; row++) {
 123             rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
 124             src += srcStride;
 125             destY += yStep;
 126          }
 127       }
 128       else {
 129          /* with zooming */
 130          GLint row;
 131          for (row = 0; row < drawHeight; row++) {
 132             span.x = destX;
 133             span.y = destY + row;
 134             span.end = drawWidth;
 135             span.array->ChanType = rbType;
 136             _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, src);
 137             src += srcStride;
 138          }
 139          span.array->ChanType = CHAN_TYPE;
 140       }
 141       return GL_TRUE;
 142    }
 143
 144    if (format == GL_RGB && type == rbType) {
 145       const GLubyte *src
 146          = (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
 147                                                    height, format, type, 0, 0);
 148       const GLint srcStride = _mesa_image_row_stride(&unpack, width,
 149                                                      format, type);
 150       if (simpleZoom) {
 151          GLint row;
 152          for (row = 0; row < drawHeight; row++) {
 153             rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
 154             src += srcStride;
 155             destY += yStep;
 156          }
 157       }
 158       else {
 159          /* with zooming */
 160          GLint row;
 161          for (row = 0; row < drawHeight; row++) {
 162             span.x = destX;
 163             span.y = destY;
 164             span.end = drawWidth;
 165             span.array->ChanType = rbType;
 166             _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, src);
 167             src += srcStride;
 168             destY++;
 169          }
 170          span.array->ChanType = CHAN_TYPE;
 171       }
 172       return GL_TRUE;
 173    }
 174
 175    /* Remaining cases haven't been tested with alignment != 1 */
 176    if (userUnpack->Alignment != 1)
 177       return GL_FALSE;
 178
 179    if (format == GL_LUMINANCE && type == CHAN_TYPE && rbType == CHAN_TYPE) {
 180       const GLchan *src = (const GLchan *) pixels
 181          + (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels);
 182       if (simpleZoom) {
 183          /* no zooming */
 184          GLint row;
 185          ASSERT(drawWidth <= MAX_WIDTH);
 186          for (row = 0; row < drawHeight; row++) {
 187             GLchan rgb[MAX_WIDTH][3];
 188             GLint i;
 189             for (i = 0;i<drawWidth;i++) {
 190                rgb[i][0] = src[i];
 191                rgb[i][1] = src[i];
 192                rgb[i][2] = src[i];
 193             }
 194             rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, rgb, NULL);
 195             src += unpack.RowLength;
 196             destY += yStep;
 197          }
 198       }
 199       else {
 200          /* with zooming */
 201          GLint row;
 202          ASSERT(drawWidth <= MAX_WIDTH);
 203          for (row = 0; row < drawHeight; row++) {
 204             GLchan rgb[MAX_WIDTH][3];
 205             GLint i;
 206             for (i = 0;i<drawWidth;i++) {
 207                rgb[i][0] = src[i];
 208                rgb[i][1] = src[i];
 209                rgb[i][2] = src[i];
 210             }
 211             span.x = destX;
 212             span.y = destY;
 213             span.end = drawWidth;
 214             _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, rgb);
 215             src += unpack.RowLength;
 216             destY++;
 217          }
 218       }
 219       return GL_TRUE;
 220    }
 221
 222    if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE && rbType == CHAN_TYPE) {
 223       const GLchan *src = (const GLchan *) pixels
 224          + (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels)*2;
 225       if (simpleZoom) {
 226          GLint row;
 227          ASSERT(drawWidth <= MAX_WIDTH);
 228          for (row = 0; row < drawHeight; row++) {
 229             GLint i;
 230             const GLchan *ptr = src;
 231             for (i = 0;i<drawWidth;i++) {
 232                span.array->rgba[i][0] = *ptr;
 233                span.array->rgba[i][1] = *ptr;
 234                span.array->rgba[i][2] = *ptr++;
 235                span.array->rgba[i][3] = *ptr++;
 236             }
 237             rb->PutRow(ctx, rb, drawWidth, destX, destY,
 238                        span.array->rgba, NULL);
 239             src += unpack.RowLength*2;
 240             destY += yStep;
 241          }
 242       }
 243       else {
 244          /* with zooming */
 245          GLint row;
 246          ASSERT(drawWidth <= MAX_WIDTH);
 247          for (row = 0; row < drawHeight; row++) {
 248             const GLchan *ptr = src;
 249             GLint i;
 250             for (i = 0;i<drawWidth;i++) {
 251                span.array->rgba[i][0] = *ptr;
 252                span.array->rgba[i][1] = *ptr;
 253                span.array->rgba[i][2] = *ptr++;
 254                span.array->rgba[i][3] = *ptr++;
 255             }
 256             span.x = destX;
 257             span.y = destY;
 258             span.end = drawWidth;
 259             _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 260                                            span.array->rgba);
 261             src += unpack.RowLength*2;
 262             destY++;
 263          }
 264       }
 265       return GL_TRUE;
 266    }
 267
 268    if (format == GL_COLOR_INDEX && type == GL_UNSIGNED_BYTE) {
 269       const GLubyte *src = (const GLubyte *) pixels
 270          + unpack.SkipRows * unpack.RowLength + unpack.SkipPixels;
 271       if (ctx->Visual.rgbMode && rbType == GL_UNSIGNED_BYTE) {
 272          /* convert ubyte/CI data to ubyte/RGBA */
 273          if (simpleZoom) {
 274             GLint row;
 275             for (row = 0; row < drawHeight; row++) {
 276                ASSERT(drawWidth <= MAX_WIDTH);
 277                _mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
 278                                       span.array->rgba8);
 279                rb->PutRow(ctx, rb, drawWidth, destX, destY,
 280                           span.array->rgba8, NULL);
 281                src += unpack.RowLength;
 282                destY += yStep;
 283             }
 284          }
 285          else {
 286             /* ubyte/CI to ubyte/RGBA with zooming */
 287             GLint row;
 288             for (row = 0; row < drawHeight; row++) {
 289                ASSERT(drawWidth <= MAX_WIDTH);
 290                _mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
 291                                       span.array->rgba8);
 292                span.x = destX;
 293                span.y = destY;
 294                span.end = drawWidth;
 295                _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 296                                               span.array->rgba8);
 297                src += unpack.RowLength;
 298                destY++;
 299             }
 300          }
 301          return GL_TRUE;
 302       }
 303       else if (!ctx->Visual.rgbMode && rbType == GL_UNSIGNED_INT) {
 304          /* write CI data to CI frame buffer */
 305          GLint row;
 306          if (simpleZoom) {
 307             for (row = 0; row < drawHeight; row++) {
 308                GLuint index32[MAX_WIDTH];
 309                GLint col;
 310                for (col = 0; col < drawWidth; col++)
 311                   index32[col] = src[col];
 312                rb->PutRow(ctx, rb, drawWidth, destX, destY, index32, NULL);
 313                src += unpack.RowLength;
 314                destY += yStep;
 315             }
 316             return GL_TRUE;
 317          }
 318       }
 319    }
 320
 321    /* can't handle this pixel format and/or data type */
 322    return GL_FALSE;
 323 }
 324
 325
 326
 327 /*
 328  * Draw color index image.
 329  */
 330 static void
 331 draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
 332                    GLsizei width, GLsizei height,
 333                    GLenum type,
 334                    const struct gl_pixelstore_attrib *unpack,
 335                    const GLvoid *pixels )
 336 {
 337    const GLint imgX = x, imgY = y;
 338    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 339    GLint row, skipPixels;
 340    SWspan span;
 341
 342    INIT_SPAN(span, GL_BITMAP);
 343    span.arrayMask = SPAN_INDEX;
 344    _swrast_span_default_attribs(ctx, &span);
 345
 346    /*
 347     * General solution
 348     */
 349    skipPixels = 0;
 350    while (skipPixels < width) {
 351       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 352       ASSERT(spanWidth <= MAX_WIDTH);
 353       for (row = 0; row < height; row++) {
 354          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 355                                                       width, height,
 356                                                       GL_COLOR_INDEX, type,
 357                                                       row, skipPixels);
 358          _mesa_unpack_index_span(ctx, spanWidth, GL_UNSIGNED_INT,
 359                                  span.array->index, type, source, unpack,
 360                                  ctx->_ImageTransferState);
 361
 362          /* These may get changed during writing/clipping */
 363          span.x = x + skipPixels;
 364          span.y = y + row;
 365          span.end = spanWidth;
 366
 367          if (zoom)
 368             _swrast_write_zoomed_index_span(ctx, imgX, imgY, &span);
 369          else
 370             _swrast_write_index_span(ctx, &span);
 371       }
 372       skipPixels += spanWidth;
 373    }
 374 }
 375
 376
 377
 378 /*
 379  * Draw stencil image.
 380  */
 381 static void
 382 draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 383                      GLsizei width, GLsizei height,
 384                      GLenum type,
 385                      const struct gl_pixelstore_attrib *unpack,
 386                      const GLvoid *pixels )
 387 {
 388    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 389    GLint skipPixels;
 390
 391    /* if width > MAX_WIDTH, have to process image in chunks */
 392    skipPixels = 0;
 393    while (skipPixels < width) {
 394       const GLint spanX = x + skipPixels;
 395       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 396       GLint row;
 397       for (row = 0; row < height; row++) {
 398          const GLint spanY = y + row;
 399          GLstencil values[MAX_WIDTH];
 400          GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
 401                          ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 402          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 403                                                       width, height,
 404                                                       GL_COLOR_INDEX, type,
 405                                                       row, skipPixels);
 406          _mesa_unpack_stencil_span(ctx, spanWidth, destType, values,
 407                                    type, source, unpack,
 408                                    ctx->_ImageTransferState);
 409          if (zoom) {
 410             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 411                                               spanX, spanY, values);
 412          }
 413          else {
 414             _swrast_write_stencil_span(ctx, spanWidth, spanX, spanY, values);
 415          }
 416       }
 417       skipPixels += spanWidth;
 418    }
 419 }
 420
 421
 422 /*
 423  * Draw depth image.
 424  */
 425 static void
 426 draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
 427                    GLsizei width, GLsizei height,
 428                    GLenum type,
 429                    const struct gl_pixelstore_attrib *unpack,
 430                    const GLvoid *pixels )
 431 {
 432    const GLboolean scaleOrBias
 433       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 434    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 435    SWspan span;
 436
 437    INIT_SPAN(span, GL_BITMAP);
 438    span.arrayMask = SPAN_Z;
 439    _swrast_span_default_attribs(ctx, &span);
 440
 441    if (type == GL_UNSIGNED_SHORT
 442        && ctx->DrawBuffer->Visual.depthBits == 16
 443        && !scaleOrBias
 444        && !zoom
 445        && ctx->Visual.rgbMode
 446        && width <= MAX_WIDTH
 447        && !unpack->SwapBytes) {
 448       /* Special case: directly write 16-bit depth values */
 449       GLint row;
 450       for (row = 0; row < height; row++) {
 451          const GLushort *zSrc = (const GLushort *)
 452             _mesa_image_address2d(unpack, pixels, width, height,
 453                                   GL_DEPTH_COMPONENT, type, row, 0);
 454          GLint i;
 455          for (i = 0; i < width; i++)
 456             span.array->z[i] = zSrc[i];
 457          span.x = x;
 458          span.y = y + row;
 459          span.end = width;
 460          _swrast_write_rgba_span(ctx, &span);
 461       }
 462    }
 463    else if (type == GL_UNSIGNED_INT
 464             && !scaleOrBias
 465             && !zoom
 466             && ctx->Visual.rgbMode
 467             && width <= MAX_WIDTH
 468             && !unpack->SwapBytes) {
 469       /* Special case: shift 32-bit values down to Visual.depthBits */
 470       const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
 471       GLint row;
 472       for (row = 0; row < height; row++) {
 473          const GLuint *zSrc = (const GLuint *)
 474             _mesa_image_address2d(unpack, pixels, width, height,
 475                                   GL_DEPTH_COMPONENT, type, row, 0);
 476          if (shift == 0) {
 477             _mesa_memcpy(span.array->z, zSrc, width * sizeof(GLuint));
 478          }
 479          else {
 480             GLint col;
 481             for (col = 0; col < width; col++)
 482                span.array->z[col] = zSrc[col] >> shift;
 483          }
 484          span.x = x;
 485          span.y = y + row;
 486          span.end = width;
 487          _swrast_write_rgba_span(ctx, &span);
 488       }
 489    }
 490    else {
 491       /* General case */
 492       const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
 493       GLint skipPixels = 0;
 494
 495       /* in case width > MAX_WIDTH do the copy in chunks */
 496       while (skipPixels < width) {
 497          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 498          GLint row;
 499          ASSERT(span.end <= MAX_WIDTH);
 500          for (row = 0; row < height; row++) {
 501             const GLvoid *zSrc = _mesa_image_address2d(unpack,
 502                                                       pixels, width, height,
 503                                                       GL_DEPTH_COMPONENT, type,
 504                                                       row, skipPixels);
 505
 506             /* Set these for each row since the _swrast_write_* function may
 507              * change them while clipping.
 508              */
 509             span.x = x + skipPixels;
 510             span.y = y + row;
 511             span.end = spanWidth;
 512
 513             _mesa_unpack_depth_span(ctx, spanWidth,
 514                                     GL_UNSIGNED_INT, span.array->z, depthMax,
 515                                     type, zSrc, unpack);
 516             if (zoom) {
 517                _swrast_write_zoomed_depth_span(ctx, x, y, &span);
 518             }
 519             else if (ctx->Visual.rgbMode) {
 520                _swrast_write_rgba_span(ctx, &span);
 521             }
 522             else {
 523                _swrast_write_index_span(ctx, &span);
 524             }
 525          }
 526          skipPixels += spanWidth;
 527       }
 528    }
 529 }
 530
 531
 532
 533 /**
 534  * Draw RGBA image.
 535  */
 536 static void
 537 draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 538                   GLsizei width, GLsizei height,
 539                   GLenum format, GLenum type,
 540                   const struct gl_pixelstore_attrib *unpack,
 541                   const GLvoid *pixels )
 542 {
 543    const GLint imgX = x, imgY = y;
 544    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 545    GLfloat *convImage = NULL;
 546    GLbitfield transferOps = ctx->_ImageTransferState;
 547    SWspan span;
 548
 549    /* Try an optimized glDrawPixels first */
 550    if (fast_draw_rgba_pixels(ctx, x, y, width, height, format, type,
 551                              unpack, pixels)) {
 552       return;
 553    }
 554
 555    INIT_SPAN(span, GL_BITMAP);
 556    _swrast_span_default_attribs(ctx, &span);
 557    span.arrayMask = SPAN_RGBA;
 558    span.arrayAttribs = FRAG_BIT_COL0; /* we're fill in COL0 attrib values */
 559
 560    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 561       /* Convolution has to be handled specially.  We'll create an
 562        * intermediate image, applying all pixel transfer operations
 563        * up to convolution.  Then we'll convolve the image.  Then
 564        * we'll proceed with the rest of the transfer operations and
 565        * rasterize the image.
 566        */
 567       GLint row;
 568       GLfloat *dest, *tmpImage;
 569
 570       tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 571       if (!tmpImage) {
 572          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 573          return;
 574       }
 575       convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 576       if (!convImage) {
 577          _mesa_free(tmpImage);
 578          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 579          return;
 580       }
 581
 582       /* Unpack the image and apply transfer ops up to convolution */
 583       dest = tmpImage;
 584       for (row = 0; row < height; row++) {
 585          const GLvoid *source = _mesa_image_address2d(unpack,
 586                                   pixels, width, height, format, type, row, 0);
 587          _mesa_unpack_color_span_float(ctx, width, GL_RGBA, (GLfloat *) dest,
 588                                      format, type, source, unpack,
 589                                      transferOps & IMAGE_PRE_CONVOLUTION_BITS);
 590          dest += width * 4;
 591       }
 592
 593       /* do convolution */
 594       if (ctx->Pixel.Convolution2DEnabled) {
 595          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 596       }
 597       else {
 598          ASSERT(ctx->Pixel.Separable2DEnabled);
 599          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 600       }
 601       _mesa_free(tmpImage);
 602
 603       /* continue transfer ops and draw the convolved image */
 604       unpack = &ctx->DefaultPacking;
 605       pixels = convImage;
 606       format = GL_RGBA;
 607       type = GL_FLOAT;
 608       transferOps &= IMAGE_POST_CONVOLUTION_BITS;
 609    }
 610    else if (ctx->Pixel.Convolution1DEnabled) {
 611       /* we only want to apply 1D convolution to glTexImage1D */
 612       transferOps &= ~(IMAGE_CONVOLUTION_BIT |
 613                        IMAGE_POST_CONVOLUTION_SCALE_BIAS);
 614    }
 615
 616    if (ctx->DrawBuffer->_NumColorDrawBuffers > 0 &&
 617        ctx->DrawBuffer->_ColorDrawBuffers[0]->DataType != GL_FLOAT &&
 618        ctx->Color.ClampFragmentColor != GL_FALSE) {
 619       /* need to clamp colors before applying fragment ops */
 620       transferOps |= IMAGE_CLAMP_BIT;
 621    }
 622
 623    /*
 624     * General solution
 625     */
 626    {
 627       const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
 628          || (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
 629       const GLbitfield interpMask = span.interpMask;
 630       const GLbitfield arrayMask = span.arrayMask;
 631       const GLint srcStride
 632          = _mesa_image_row_stride(unpack, width, format, type);
 633       GLint skipPixels = 0;
 634       /* use span array for temp color storage */
 635       GLfloat *rgba = (GLfloat *) span.array->attribs[FRAG_ATTRIB_COL0];
 636
 637       /* if the span is wider than MAX_WIDTH we have to do it in chunks */
 638       while (skipPixels < width) {
 639          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 640          const GLubyte *source
 641             = (const GLubyte *) _mesa_image_address2d(unpack, pixels,
 642                                                       width, height, format,
 643                                                       type, 0, skipPixels);
 644          GLint row;
 645
 646          for (row = 0; row < height; row++) {
 647             /* get image row as float/RGBA */
 648             _mesa_unpack_color_span_float(ctx, spanWidth, GL_RGBA, rgba,
 649                                      format, type, source, unpack,
 650                                      transferOps);
 651             /* draw the span */
 652             if (!sink) {
 653                /* Set these for each row since the _swrast_write_* functions
 654                 * may change them while clipping/rendering.
 655                 */
 656                span.array->ChanType = GL_FLOAT;
 657                span.x = x + skipPixels;
 658                span.y = y + row;
 659                span.end = spanWidth;
 660                span.arrayMask = arrayMask;
 661                span.interpMask = interpMask;
 662                if (zoom) {
 663                   _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, rgba);
 664                }
 665                else {
 666                   _swrast_write_rgba_span(ctx, &span);
 667                }
 668             }
 669
 670             source += srcStride;
 671          } /* for row */
 672
 673          skipPixels += spanWidth;
 674       } /* while skipPixels < width */
 675
 676       /* XXX this is ugly/temporary, to undo above change */
 677       span.array->ChanType = CHAN_TYPE;
 678    }
 679
 680    if (convImage) {
 681       _mesa_free(convImage);
 682    }
 683 }
 684
 685
 686 /**
 687  * This is a bit different from drawing GL_DEPTH_COMPONENT pixels.
 688  * The only per-pixel operations that apply are depth scale/bias,
 689  * stencil offset/shift, GL_DEPTH_WRITEMASK and GL_STENCIL_WRITEMASK,
 690  * and pixel zoom.
 691  * Also, only the depth buffer and stencil buffers are touched, not the
 692  * color buffer(s).
 693  */
 694 static void
 695 draw_depth_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 696                           GLsizei width, GLsizei height, GLenum type,
 697                           const struct gl_pixelstore_attrib *unpack,
 698                           const GLvoid *pixels)
 699 {
 700    const GLint imgX = x, imgY = y;
 701    const GLboolean scaleOrBias
 702       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 703    const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
 704    const GLuint stencilMask = ctx->Stencil.WriteMask[0];
 705    const GLuint stencilType = (STENCIL_BITS == 8) ?
 706       GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 707    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 708    struct gl_renderbuffer *depthRb, *stencilRb;
 709    struct gl_pixelstore_attrib clippedUnpack = *unpack;
 710
 711    if (!zoom) {
 712       if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
 713                                  &clippedUnpack)) {
 714          /* totally clipped */
 715          return;
 716       }
 717    }
 718
 719    depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 720    stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 721    ASSERT(depthRb);
 722    ASSERT(stencilRb);
 723
 724    if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 725        stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 726        depthRb == stencilRb &&
 727        !scaleOrBias &&
 728        !zoom &&
 729        ctx->Depth.Mask &&
 730        (stencilMask & 0xff) == 0xff) {
 731       /* This is the ideal case.
 732        * Drawing GL_DEPTH_STENCIL pixels into a combined depth/stencil buffer.
 733        * Plus, no pixel transfer ops, zooming, or masking needed.
 734        */
 735       GLint i;
 736       for (i = 0; i < height; i++) {
 737          const GLuint *src = (const GLuint *)
 738             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 739                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 740          depthRb->PutRow(ctx, depthRb, width, x, y + i, src, NULL);
 741       }
 742    }
 743    else {
 744       /* sub-optimal cases:
 745        * Separate depth/stencil buffers, or pixel transfer ops required.
 746        */
 747       /* XXX need to handle very wide images (skippixels) */
 748       GLint i;
 749
 750       depthRb = ctx->DrawBuffer->_DepthBuffer;
 751       stencilRb = ctx->DrawBuffer->_StencilBuffer;
 752
 753       for (i = 0; i < height; i++) {
 754          const GLuint *depthStencilSrc = (const GLuint *)
 755             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 756                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 757
 758          if (ctx->Depth.Mask) {
 759             if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 24) {
 760                /* fast path 24-bit zbuffer */
 761                GLuint zValues[MAX_WIDTH];
 762                GLint j;
 763                ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
 764                for (j = 0; j < width; j++) {
 765                   zValues[j] = depthStencilSrc[j] >> 8;
 766                }
 767                if (zoom)
 768                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
 769                                               x, y + i, zValues);
 770                else
 771                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 772             }
 773             else if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 16) {
 774                /* fast path 16-bit zbuffer */
 775                GLushort zValues[MAX_WIDTH];
 776                GLint j;
 777                ASSERT(depthRb->DataType == GL_UNSIGNED_SHORT);
 778                for (j = 0; j < width; j++) {
 779                   zValues[j] = depthStencilSrc[j] >> 16;
 780                }
 781                if (zoom)
 782                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
 783                                               x, y + i, zValues);
 784                else
 785                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 786             }
 787             else {
 788                /* general case */
 789                GLuint zValues[MAX_WIDTH];  /* 16 or 32-bit Z value storage */
 790                _mesa_unpack_depth_span(ctx, width,
 791                                        depthRb->DataType, zValues, depthMax,
 792                                        type, depthStencilSrc, &clippedUnpack);
 793                if (zoom) {
 794                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width, x,
 795                                               y + i, zValues);
 796                }
 797                else {
 798                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 799                }
 800             }
 801          }
 802
 803          if (stencilMask != 0x0) {
 804             GLstencil stencilValues[MAX_WIDTH];
 805             /* get stencil values, with shift/offset/mapping */
 806             _mesa_unpack_stencil_span(ctx, width, stencilType, stencilValues,
 807                                       type, depthStencilSrc, &clippedUnpack,
 808                                       ctx->_ImageTransferState);
 809             if (zoom)
 810                _swrast_write_zoomed_stencil_span(ctx, imgX, imgY, width,
 811                                                   x, y + i, stencilValues);
 812             else
 813                _swrast_write_stencil_span(ctx, width, x, y + i, stencilValues);
 814          }
 815       }
 816    }
 817 }
 818
 819
 820 /**
 821  * Execute software-based glDrawPixels.
 822  * By time we get here, all error checking will have been done.
 823  */
 824 void
 825 _swrast_DrawPixels( GLcontext *ctx,
 826                     GLint x, GLint y,
 827                     GLsizei width, GLsizei height,
 828                     GLenum format, GLenum type,
 829                     const struct gl_pixelstore_attrib *unpack,
 830                     const GLvoid *pixels )
 831 {
 832    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 833
 834    RENDER_START(swrast,ctx);
 835
 836    if (ctx->NewState)
 837       _mesa_update_state(ctx);
 838
 839    if (swrast->NewState)
 840       _swrast_validate_derived( ctx );
 841
 842     pixels = _mesa_map_drawpix_pbo(ctx, unpack, pixels);
 843     if (!pixels) {
 844        RENDER_FINISH(swrast,ctx);
 845        return;
 846     }
 847
 848    switch (format) {
 849    case GL_STENCIL_INDEX:
 850       draw_stencil_pixels( ctx, x, y, width, height, type, unpack, pixels );
 851       break;
 852    case GL_DEPTH_COMPONENT:
 853       draw_depth_pixels( ctx, x, y, width, height, type, unpack, pixels );
 854       break;
 855    case GL_COLOR_INDEX:
 856       if (ctx->Visual.rgbMode)
 857          draw_rgba_pixels(ctx, x,y, width, height, format, type, unpack, pixels);
 858       else
 859          draw_index_pixels(ctx, x, y, width, height, type, unpack, pixels);
 860       break;
 861    case GL_RED:
 862    case GL_GREEN:
 863    case GL_BLUE:
 864    case GL_ALPHA:
 865    case GL_LUMINANCE:
 866    case GL_LUMINANCE_ALPHA:
 867    case GL_RGB:
 868    case GL_BGR:
 869    case GL_RGBA:
 870    case GL_BGRA:
 871    case GL_ABGR_EXT:
 872       draw_rgba_pixels(ctx, x, y, width, height, format, type, unpack, pixels);
 873       break;
 874    case GL_DEPTH_STENCIL_EXT:
 875       draw_depth_stencil_pixels(ctx, x, y, width, height,
 876                                 type, unpack, pixels);
 877       break;
 878    default:
 879       _mesa_problem(ctx, "unexpected format in _swrast_DrawPixels");
 880       /* don't return yet, clean-up */
 881    }
 882
 883    RENDER_FINISH(swrast,ctx);
 884
 885    _mesa_unmap_drapix_pbo(ctx, unpack);
 886 }
 887
 888
 889
 890 #if 0  /* experimental */
 891 /*
 892  * Execute glDrawDepthPixelsMESA().
 893  */
 894 void
 895 _swrast_DrawDepthPixelsMESA( GLcontext *ctx,
 896                              GLint x, GLint y,
 897                              GLsizei width, GLsizei height,
 898                              GLenum colorFormat, GLenum colorType,
 899                              const GLvoid *colors,
 900                              GLenum depthType, const GLvoid *depths,
 901                              const struct gl_pixelstore_attrib *unpack )
 902 {
 903    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 904
 905    if (swrast->NewState)
 906       _swrast_validate_derived( ctx );
 907
 908    RENDER_START(swrast,ctx);
 909
 910    switch (colorFormat) {
 911    case GL_COLOR_INDEX:
 912       if (ctx->Visual.rgbMode)
 913          draw_rgba_pixels(ctx, x,y, width, height, colorFormat, colorType,
 914                           unpack, colors);
 915       else
 916          draw_index_pixels(ctx, x, y, width, height, colorType,
 917                            unpack, colors);
 918       break;
 919    case GL_RED:
 920    case GL_GREEN:
 921    case GL_BLUE:
 922    case GL_ALPHA:
 923    case GL_LUMINANCE:
 924    case GL_LUMINANCE_ALPHA:
 925    case GL_RGB:
 926    case GL_BGR:
 927    case GL_RGBA:
 928    case GL_BGRA:
 929    case GL_ABGR_EXT:
 930       draw_rgba_pixels(ctx, x, y, width, height, colorFormat, colorType,
 931                        unpack, colors);
 932       break;
 933    default:
 934       _mesa_problem(ctx, "unexpected format in glDrawDepthPixelsMESA");
 935    }
 936
 937    RENDER_FINISH(swrast,ctx);
 938 }
 939 #endif