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