src/mesa/swrast/s_drawpix.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.2
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include "glheader.h"
  27 #include "bufferobj.h"
  28 #include "context.h"
  29 #include "convolve.h"
  30 #include "image.h"
  31 #include "macros.h"
  32 #include "imports.h"
  33 #include "pixel.h"
  34 #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][0];
  57    const GLenum rbType = rb->DataType;
  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 ((swrast->_RasterMask & ~CLIP_BIT) ||
  66        ctx->Texture._EnabledCoordUnits ||
  67        userUnpack->SwapBytes ||
  68        ctx->_ImageTransferState) {
  69       /* can't handle any of those conditions */
  70       return GL_FALSE;
  71    }
  72
  73    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
  74    if (ctx->Depth.Test)
  75       _swrast_span_default_z(ctx, &span);
  76    if (swrast->_FogEnabled)
  77       _swrast_span_default_fog(ctx, &span);
  78    if (ctx->Texture._EnabledCoordUnits)
  79       _swrast_span_default_texcoords(ctx, &span);
  80
  81    /* copy input params since clipping may change them */
  82    unpack = *userUnpack;
  83    destX = x;
  84    destY = y;
  85    drawWidth = width;
  86    drawHeight = height;
  87
  88    /* check for simple zooming and clipping */
  89    if (ctx->Pixel.ZoomX == 1.0F &&
  90        (ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F)) {
  91       if (!_mesa_clip_drawpixels(ctx, &destX, &destY,
  92                                  &drawWidth, &drawHeight, &unpack)) {
  93          /* image was completely clipped: no-op, all done */
  94          return GL_TRUE;
  95       }
  96       simpleZoom = GL_TRUE;
  97       yStep = (GLint) ctx->Pixel.ZoomY;
  98       ASSERT(yStep == 1 || yStep == -1);
  99    }
 100    else {
 101       /* non-simple zooming */
 102       simpleZoom = GL_FALSE;
 103       yStep = 1;
 104       if (unpack.RowLength == 0)
 105          unpack.RowLength = width;
 106    }
 107
 108    /*
 109     * Ready to draw!
 110     */
 111
 112    if (format == GL_RGBA && type == rbType) {
 113       const GLubyte *src
 114          = (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
 115                                                    height, format, type, 0, 0);
 116       const GLint srcStride = _mesa_image_row_stride(&unpack, width,
 117                                                      format, type);
 118       if (simpleZoom) {
 119          GLint row;
 120          for (row = 0; row < drawHeight; row++) {
 121             rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
 122             src += srcStride;
 123             destY += yStep;
 124          }
 125       }
 126       else {
 127          /* with zooming */
 128          GLint row;
 129          for (row = 0; row < drawHeight; row++) {
 130             span.x = destX;
 131             span.y = destY + row;
 132             span.end = drawWidth;
 133             span.array->ChanType = rbType;
 134             _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, src);
 135             src += srcStride;
 136          }
 137          span.array->ChanType = CHAN_TYPE;
 138       }
 139       return GL_TRUE;
 140    }
 141
 142    if (format == GL_RGB && type == rbType) {
 143       const GLubyte *src
 144          = (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
 145                                                    height, format, type, 0, 0);
 146       const GLint srcStride = _mesa_image_row_stride(&unpack, width,
 147                                                      format, type);
 148       if (simpleZoom) {
 149          GLint row;
 150          for (row = 0; row < drawHeight; row++) {
 151             rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
 152             src += srcStride;
 153             destY += yStep;
 154          }
 155       }
 156       else {
 157          /* with zooming */
 158          GLint row;
 159          for (row = 0; row < drawHeight; row++) {
 160             span.x = destX;
 161             span.y = destY;
 162             span.end = drawWidth;
 163             span.array->ChanType = rbType;
 164             _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, src);
 165             src += srcStride;
 166             destY++;
 167          }
 168          span.array->ChanType = CHAN_TYPE;
 169       }
 170       return GL_TRUE;
 171    }
 172
 173    /* Remaining cases haven't been tested with alignment != 1 */
 174    if (userUnpack->Alignment != 1)
 175       return GL_FALSE;
 176
 177    if (format == GL_LUMINANCE && type == CHAN_TYPE && rbType == CHAN_TYPE) {
 178       const GLchan *src = (const GLchan *) pixels
 179          + (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels);
 180       if (simpleZoom) {
 181          /* no zooming */
 182          GLint row;
 183          ASSERT(drawWidth <= MAX_WIDTH);
 184          for (row = 0; row < drawHeight; row++) {
 185             GLchan rgb[MAX_WIDTH][3];
 186             GLint i;
 187             for (i = 0;i<drawWidth;i++) {
 188                rgb[i][0] = src[i];
 189                rgb[i][1] = src[i];
 190                rgb[i][2] = src[i];
 191             }
 192             rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, rgb, NULL);
 193             src += unpack.RowLength;
 194             destY += yStep;
 195          }
 196       }
 197       else {
 198          /* with zooming */
 199          GLint row;
 200          ASSERT(drawWidth <= MAX_WIDTH);
 201          for (row = 0; row < drawHeight; row++) {
 202             GLchan rgb[MAX_WIDTH][3];
 203             GLint i;
 204             for (i = 0;i<drawWidth;i++) {
 205                rgb[i][0] = src[i];
 206                rgb[i][1] = src[i];
 207                rgb[i][2] = src[i];
 208             }
 209             span.x = destX;
 210             span.y = destY;
 211             span.end = drawWidth;
 212             _swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, rgb);
 213             src += unpack.RowLength;
 214             destY++;
 215          }
 216       }
 217       return GL_TRUE;
 218    }
 219
 220    if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE && rbType == CHAN_TYPE) {
 221       const GLchan *src = (const GLchan *) pixels
 222          + (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels)*2;
 223       if (simpleZoom) {
 224          GLint row;
 225          ASSERT(drawWidth <= MAX_WIDTH);
 226          for (row = 0; row < drawHeight; row++) {
 227             GLint i;
 228             const GLchan *ptr = src;
 229             for (i = 0;i<drawWidth;i++) {
 230                span.array->rgba[i][0] = *ptr;
 231                span.array->rgba[i][1] = *ptr;
 232                span.array->rgba[i][2] = *ptr++;
 233                span.array->rgba[i][3] = *ptr++;
 234             }
 235             rb->PutRow(ctx, rb, drawWidth, destX, destY,
 236                        span.array->rgba, NULL);
 237             src += unpack.RowLength*2;
 238             destY += yStep;
 239          }
 240       }
 241       else {
 242          /* with zooming */
 243          GLint row;
 244          ASSERT(drawWidth <= MAX_WIDTH);
 245          for (row = 0; row < drawHeight; row++) {
 246             const GLchan *ptr = src;
 247             GLint i;
 248             for (i = 0;i<drawWidth;i++) {
 249                span.array->rgba[i][0] = *ptr;
 250                span.array->rgba[i][1] = *ptr;
 251                span.array->rgba[i][2] = *ptr++;
 252                span.array->rgba[i][3] = *ptr++;
 253             }
 254             span.x = destX;
 255             span.y = destY;
 256             span.end = drawWidth;
 257             _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 258                                            span.array->rgba);
 259             src += unpack.RowLength*2;
 260             destY++;
 261          }
 262       }
 263       return GL_TRUE;
 264    }
 265
 266    if (format == GL_COLOR_INDEX && type == GL_UNSIGNED_BYTE) {
 267       const GLubyte *src = (const GLubyte *) pixels
 268          + unpack.SkipRows * unpack.RowLength + unpack.SkipPixels;
 269       if (ctx->Visual.rgbMode && rbType == GL_UNSIGNED_BYTE) {
 270          /* convert ubyte/CI data to ubyte/RGBA */
 271          if (simpleZoom) {
 272             GLint row;
 273             for (row = 0; row < drawHeight; row++) {
 274                ASSERT(drawWidth <= MAX_WIDTH);
 275                _mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
 276                                       span.array->color.sz1.rgba);
 277                rb->PutRow(ctx, rb, drawWidth, destX, destY,
 278                           span.array->color.sz1.rgba, NULL);
 279                src += unpack.RowLength;
 280                destY += yStep;
 281             }
 282          }
 283          else {
 284             /* ubyte/CI to ubyte/RGBA with zooming */
 285             GLint row;
 286             for (row = 0; row < drawHeight; row++) {
 287                ASSERT(drawWidth <= MAX_WIDTH);
 288                _mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
 289                                       span.array->color.sz1.rgba);
 290                span.x = destX;
 291                span.y = destY;
 292                span.end = drawWidth;
 293                _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
 294                                               span.array->color.sz1.rgba);
 295                src += unpack.RowLength;
 296                destY++;
 297             }
 298          }
 299          return GL_TRUE;
 300       }
 301       else if (!ctx->Visual.rgbMode && rbType == GL_UNSIGNED_INT) {
 302          /* write CI data to CI frame buffer */
 303          GLint row;
 304          if (simpleZoom) {
 305             for (row = 0; row < drawHeight; row++) {
 306                GLuint index32[MAX_WIDTH];
 307                GLint col;
 308                for (col = 0; col < drawWidth; col++)
 309                   index32[col] = src[col];
 310                rb->PutRow(ctx, rb, drawWidth, destX, destY, index32, NULL);
 311                src += unpack.RowLength;
 312                destY += yStep;
 313             }
 314             return GL_TRUE;
 315          }
 316       }
 317    }
 318
 319    /* can't handle this pixel format and/or data type */
 320    return GL_FALSE;
 321 }
 322
 323
 324
 325 /*
 326  * Draw color index image.
 327  */
 328 static void
 329 draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
 330                    GLsizei width, GLsizei height,
 331                    GLenum type,
 332                    const struct gl_pixelstore_attrib *unpack,
 333                    const GLvoid *pixels )
 334 {
 335    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 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, 0, 0, SPAN_INDEX);
 342
 343    if (ctx->Depth.Test)
 344       _swrast_span_default_z(ctx, &span);
 345    if (swrast->_FogEnabled)
 346       _swrast_span_default_fog(ctx, &span);
 347
 348    /*
 349     * General solution
 350     */
 351    skipPixels = 0;
 352    while (skipPixels < width) {
 353       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 354       ASSERT(spanWidth <= MAX_WIDTH);
 355       for (row = 0; row < height; row++) {
 356          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 357                                                       width, height,
 358                                                       GL_COLOR_INDEX, type,
 359                                                       row, skipPixels);
 360          _mesa_unpack_index_span(ctx, spanWidth, GL_UNSIGNED_INT,
 361                                  span.array->index, type, source, unpack,
 362                                  ctx->_ImageTransferState);
 363
 364          /* These may get changed during writing/clipping */
 365          span.x = x + skipPixels;
 366          span.y = y + row;
 367          span.end = spanWidth;
 368
 369          if (zoom)
 370             _swrast_write_zoomed_index_span(ctx, imgX, imgY, &span);
 371          else
 372             _swrast_write_index_span(ctx, &span);
 373       }
 374       skipPixels += spanWidth;
 375    }
 376 }
 377
 378
 379
 380 /*
 381  * Draw stencil image.
 382  */
 383 static void
 384 draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 385                      GLsizei width, GLsizei height,
 386                      GLenum type,
 387                      const struct gl_pixelstore_attrib *unpack,
 388                      const GLvoid *pixels )
 389 {
 390    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 391    GLint skipPixels;
 392
 393    /* if width > MAX_WIDTH, have to process image in chunks */
 394    skipPixels = 0;
 395    while (skipPixels < width) {
 396       const GLint spanX = x + skipPixels;
 397       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 398       GLint row;
 399       for (row = 0; row < height; row++) {
 400          const GLint spanY = y + row;
 401          GLstencil values[MAX_WIDTH];
 402          GLenum destType = (sizeof(GLstencil) == sizeof(GLubyte))
 403                          ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 404          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 405                                                       width, height,
 406                                                       GL_COLOR_INDEX, type,
 407                                                       row, skipPixels);
 408          _mesa_unpack_index_span(ctx, spanWidth, destType, values,
 409                                  type, source, unpack,
 410                                  ctx->_ImageTransferState);
 411          _mesa_apply_stencil_transfer_ops(ctx, spanWidth, values);
 412          if (zoom) {
 413             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 414                                               spanX, spanY, values);
 415          }
 416          else {
 417             _swrast_write_stencil_span(ctx, spanWidth, spanX, spanY, values);
 418          }
 419       }
 420       skipPixels += spanWidth;
 421    }
 422 }
 423
 424
 425 /*
 426  * Draw depth image.
 427  */
 428 static void
 429 draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
 430                    GLsizei width, GLsizei height,
 431                    GLenum type,
 432                    const struct gl_pixelstore_attrib *unpack,
 433                    const GLvoid *pixels )
 434 {
 435    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 436    const GLboolean scaleOrBias
 437       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 438    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 439    SWspan span;
 440
 441    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
 442
 443    _swrast_span_default_color(ctx, &span);
 444
 445    if (swrast->_FogEnabled)
 446       _swrast_span_default_fog(ctx, &span);
 447    if (ctx->Texture._EnabledCoordUnits)
 448       _swrast_span_default_texcoords(ctx, &span);
 449
 450    if (type == GL_UNSIGNED_SHORT
 451        && ctx->DrawBuffer->Visual.depthBits == 16
 452        && !scaleOrBias
 453        && !zoom
 454        && ctx->Visual.rgbMode
 455        && width <= MAX_WIDTH) {
 456       /* Special case: directly write 16-bit depth values */
 457       GLint row;
 458       for (row = 0; row < height; row++) {
 459          const GLushort *zSrc = (const GLushort *)
 460             _mesa_image_address2d(unpack, pixels, width, height,
 461                                   GL_DEPTH_COMPONENT, type, row, 0);
 462          GLint i;
 463          for (i = 0; i < width; i++)
 464             span.array->z[i] = zSrc[i];
 465          span.x = x;
 466          span.y = y + row;
 467          span.end = width;
 468          _swrast_write_rgba_span(ctx, &span);
 469       }
 470    }
 471    else if (type == GL_UNSIGNED_INT
 472             && !scaleOrBias
 473             && !zoom
 474             && ctx->Visual.rgbMode
 475             && width <= MAX_WIDTH) {
 476       /* Special case: shift 32-bit values down to Visual.depthBits */
 477       const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
 478       GLint row;
 479       for (row = 0; row < height; row++) {
 480          const GLuint *zSrc = (const GLuint *)
 481             _mesa_image_address2d(unpack, pixels, width, height,
 482                                   GL_DEPTH_COMPONENT, type, row, 0);
 483          if (shift == 0) {
 484             _mesa_memcpy(span.array->z, zSrc, width * sizeof(GLuint));
 485          }
 486          else {
 487             GLint col;
 488             for (col = 0; col < width; col++)
 489                span.array->z[col] = zSrc[col] >> shift;
 490          }
 491          span.x = x;
 492          span.y = y + row;
 493          span.end = width;
 494          _swrast_write_rgba_span(ctx, &span);
 495       }
 496    }
 497    else {
 498       /* General case */
 499       const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 500       GLint skipPixels = 0;
 501
 502       /* in case width > MAX_WIDTH do the copy in chunks */
 503       while (skipPixels < width) {
 504          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 505          GLint row;
 506          ASSERT(span.end <= MAX_WIDTH);
 507          for (row = 0; row < height; row++) {
 508             const GLvoid *zSrc = _mesa_image_address2d(unpack,
 509                                                       pixels, width, height,
 510                                                       GL_DEPTH_COMPONENT, type,
 511                                                       row, skipPixels);
 512
 513             /* Set these for each row since the _swrast_write_* function may
 514              * change them while clipping.
 515              */
 516             span.x = x + skipPixels;
 517             span.y = y + row;
 518             span.end = spanWidth;
 519
 520             _mesa_unpack_depth_span(ctx, spanWidth,
 521                                     GL_UNSIGNED_INT, span.array->z, depthMax,
 522                                     type, zSrc, unpack);
 523             if (zoom) {
 524                _swrast_write_zoomed_depth_span(ctx, x, y, &span);
 525             }
 526             else if (ctx->Visual.rgbMode) {
 527                _swrast_write_rgba_span(ctx, &span);
 528             }
 529             else {
 530                _swrast_write_index_span(ctx, &span);
 531             }
 532          }
 533          skipPixels += spanWidth;
 534       }
 535    }
 536 }
 537
 538
 539
 540 /**
 541  * Draw RGBA image.
 542  */
 543 static void
 544 draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 545                   GLsizei width, GLsizei height,
 546                   GLenum format, GLenum type,
 547                   const struct gl_pixelstore_attrib *unpack,
 548                   const GLvoid *pixels )
 549 {
 550    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 551    const GLint imgX = x, imgY = y;
 552    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 553    GLfloat *convImage = NULL;
 554    GLbitfield transferOps = ctx->_ImageTransferState;
 555    SWspan span;
 556
 557    /* Try an optimized glDrawPixels first */
 558    if (fast_draw_rgba_pixels(ctx, x, y, width, height, format, type,
 559                              unpack, pixels))
 560       return;
 561
 562    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
 563    if (ctx->Depth.Test)
 564       _swrast_span_default_z(ctx, &span);
 565    if (swrast->_FogEnabled)
 566       _swrast_span_default_fog(ctx, &span);
 567    if (ctx->Texture._EnabledCoordUnits)
 568       _swrast_span_default_texcoords(ctx, &span);
 569
 570    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 571       /* Convolution has to be handled specially.  We'll create an
 572        * intermediate image, applying all pixel transfer operations
 573        * up to convolution.  Then we'll convolve the image.  Then
 574        * we'll proceed with the rest of the transfer operations and
 575        * rasterize the image.
 576        */
 577       GLint row;
 578       GLfloat *dest, *tmpImage;
 579
 580       tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 581       if (!tmpImage) {
 582          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 583          return;
 584       }
 585       convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 586       if (!convImage) {
 587          _mesa_free(tmpImage);
 588          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 589          return;
 590       }
 591
 592       /* Unpack the image and apply transfer ops up to convolution */
 593       dest = tmpImage;
 594       for (row = 0; row < height; row++) {
 595          const GLvoid *source = _mesa_image_address2d(unpack,
 596                                   pixels, width, height, format, type, row, 0);
 597          _mesa_unpack_color_span_float(ctx, width, GL_RGBA, (GLfloat *) dest,
 598                                      format, type, source, unpack,
 599                                      transferOps & IMAGE_PRE_CONVOLUTION_BITS);
 600          dest += width * 4;
 601       }
 602
 603       /* do convolution */
 604       if (ctx->Pixel.Convolution2DEnabled) {
 605          _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 606       }
 607       else {
 608          ASSERT(ctx->Pixel.Separable2DEnabled);
 609          _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 610       }
 611       _mesa_free(tmpImage);
 612
 613       /* continue transfer ops and draw the convolved image */
 614       unpack = &ctx->DefaultPacking;
 615       pixels = convImage;
 616       format = GL_RGBA;
 617       type = GL_FLOAT;
 618       transferOps &= IMAGE_POST_CONVOLUTION_BITS;
 619    }
 620
 621    if (ctx->DrawBuffer->_NumColorDrawBuffers[0] > 0 &&
 622        ctx->DrawBuffer->_ColorDrawBuffers[0][0]->DataType != GL_FLOAT &&
 623        ctx->Color.ClampFragmentColor != GL_FALSE) {
 624       /* need to clamp colors before applying fragment ops */
 625       transferOps |= IMAGE_CLAMP_BIT;
 626    }
 627
 628    /*
 629     * General solution
 630     */
 631    {
 632       const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
 633          || (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
 634       const GLbitfield interpMask = span.interpMask;
 635       const GLbitfield arrayMask = span.arrayMask;
 636       const GLint srcStride
 637          = _mesa_image_row_stride(unpack, width, format, type);
 638       GLint skipPixels = 0;
 639       /* use span array for temp color storage */
 640       GLfloat *rgba = (GLfloat *) span.array->color.sz4.rgba;
 641
 642       /* if the span is wider than MAX_WIDTH we have to do it in chunks */
 643       while (skipPixels < width) {
 644          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 645          const GLubyte *source
 646             = (const GLubyte *) _mesa_image_address2d(unpack, pixels,
 647                                                       width, height, format,
 648                                                       type, 0, skipPixels);
 649          GLint row;
 650
 651          for (row = 0; row < height; row++) {
 652             /* get image row as float/RGBA */
 653             _mesa_unpack_color_span_float(ctx, spanWidth, GL_RGBA, rgba,
 654                                      format, type, source, unpack,
 655                                      transferOps);
 656             /* draw the span */
 657             if (!sink) {
 658                /* Set these for each row since the _swrast_write_* functions
 659                 * may change them while clipping/rendering.
 660                 */
 661                span.array->ChanType = GL_FLOAT;
 662                span.x = x + skipPixels;
 663                span.y = y + row;
 664                span.end = spanWidth;
 665                span.arrayMask = arrayMask;
 666                span.interpMask = interpMask;
 667                if (zoom) {
 668                   _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, rgba);
 669                }
 670                else {
 671                   _swrast_write_rgba_span(ctx, &span);
 672                }
 673             }
 674
 675             source += srcStride;
 676          } /* for row */
 677
 678          skipPixels += spanWidth;
 679       } /* while skipPixels < width */
 680
 681       /* XXX this is ugly/temporary, to undo above change */
 682       span.array->ChanType = CHAN_TYPE;
 683    }
 684
 685    if (convImage) {
 686       _mesa_free(convImage);
 687    }
 688 }
 689
 690
 691 /**
 692  * This is a bit different from drawing GL_DEPTH_COMPONENT pixels.
 693  * The only per-pixel operations that apply are depth scale/bias,
 694  * stencil offset/shift, GL_DEPTH_WRITEMASK and GL_STENCIL_WRITEMASK,
 695  * and pixel zoom.
 696  * Also, only the depth buffer and stencil buffers are touched, not the
 697  * color buffer(s).
 698  */
 699 static void
 700 draw_depth_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 701                           GLsizei width, GLsizei height, GLenum type,
 702                           const struct gl_pixelstore_attrib *unpack,
 703                           const GLvoid *pixels)
 704 {
 705    const GLint imgX = x, imgY = y;
 706    const GLboolean scaleOrBias
 707       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 708    const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
 709    const GLuint stencilMask = ctx->Stencil.WriteMask[0];
 710    const GLuint stencilType = (STENCIL_BITS == 8) ?
 711       GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
 712    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 713    struct gl_renderbuffer *depthRb, *stencilRb;
 714    struct gl_pixelstore_attrib clippedUnpack = *unpack;
 715
 716    if (!zoom) {
 717       if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
 718                                  &clippedUnpack)) {
 719          /* totally clipped */
 720          return;
 721       }
 722    }
 723
 724    depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 725    stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 726    ASSERT(depthRb);
 727    ASSERT(stencilRb);
 728
 729    if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 730        stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT &&
 731        depthRb == stencilRb &&
 732        !scaleOrBias &&
 733        !zoom &&
 734        ctx->Depth.Mask &&
 735        (stencilMask & 0xff) == 0xff) {
 736       /* This is the ideal case.
 737        * Drawing GL_DEPTH_STENCIL pixels into a combined depth/stencil buffer.
 738        * Plus, no pixel transfer ops, zooming, or masking needed.
 739        */
 740       GLint i;
 741       for (i = 0; i < height; i++) {
 742          const GLuint *src = (const GLuint *)
 743             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 744                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 745          depthRb->PutRow(ctx, depthRb, width, x, y + i, src, NULL);
 746       }
 747    }
 748    else {
 749       /* sub-optimal cases:
 750        * Separate depth/stencil buffers, or pixel transfer ops required.
 751        */
 752       /* XXX need to handle very wide images (skippixels) */
 753       GLint i;
 754
 755       depthRb = ctx->DrawBuffer->_DepthBuffer;
 756       stencilRb = ctx->DrawBuffer->_StencilBuffer;
 757
 758       for (i = 0; i < height; i++) {
 759          const GLuint *depthStencilSrc = (const GLuint *)
 760             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 761                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 762
 763          if (ctx->Depth.Mask) {
 764             if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 24) {
 765                /* fast path 24-bit zbuffer */
 766                GLuint zValues[MAX_WIDTH];
 767                GLint j;
 768                ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
 769                for (j = 0; j < width; j++) {
 770                   zValues[j] = depthStencilSrc[j] >> 8;
 771                }
 772                if (zoom)
 773                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
 774                                               x, y + i, zValues);
 775                else
 776                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 777             }
 778             else if (!scaleOrBias && ctx->DrawBuffer->Visual.depthBits == 16) {
 779                /* fast path 16-bit zbuffer */
 780                GLushort zValues[MAX_WIDTH];
 781                GLint j;
 782                ASSERT(depthRb->DataType == GL_UNSIGNED_SHORT);
 783                for (j = 0; j < width; j++) {
 784                   zValues[j] = depthStencilSrc[j] >> 16;
 785                }
 786                if (zoom)
 787                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width,
 788                                               x, y + i, zValues);
 789                else
 790                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 791             }
 792             else {
 793                /* general case */
 794                GLuint zValues[MAX_WIDTH];  /* 16 or 32-bit Z value storage */
 795                _mesa_unpack_depth_span(ctx, width,
 796                                        depthRb->DataType, zValues, depthScale,
 797                                        type, depthStencilSrc, &clippedUnpack);
 798                if (zoom) {
 799                   _swrast_write_zoomed_z_span(ctx, imgX, imgY, width, x,
 800                                               y + i, zValues);
 801                }
 802                else {
 803                   depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues,NULL);
 804                }
 805             }
 806          }
 807
 808          if (stencilMask != 0x0) {
 809             GLstencil stencilValues[MAX_WIDTH];
 810             /* get stencil values, with shift/offset/mapping */
 811             _mesa_unpack_stencil_span(ctx, width, stencilType, stencilValues,
 812                                       type, depthStencilSrc, &clippedUnpack,
 813                                       ctx->_ImageTransferState);
 814             if (zoom)
 815                _swrast_write_zoomed_stencil_span(ctx, imgX, imgY, width,
 816                                                   x, y + i, stencilValues);
 817             else
 818                _swrast_write_stencil_span(ctx, width, x, y + i, stencilValues);
 819          }
 820       }
 821    }
 822 }
 823
 824
 825
 826 /**
 827  * Execute software-based glDrawPixels.
 828  * By time we get here, all error checking will have been done.
 829  */
 830 void
 831 _swrast_DrawPixels( GLcontext *ctx,
 832                     GLint x, GLint y,
 833                     GLsizei width, GLsizei height,
 834                     GLenum format, GLenum type,
 835                     const struct gl_pixelstore_attrib *unpack,
 836                     const GLvoid *pixels )
 837 {
 838    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 839
 840    RENDER_START(swrast,ctx);
 841
 842    if (ctx->NewState)
 843       _mesa_update_state(ctx);
 844
 845    if (swrast->NewState)
 846       _swrast_validate_derived( ctx );
 847
 848    if (unpack->BufferObj->Name) {
 849       /* unpack from PBO */
 850       GLubyte *buf;
 851       if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
 852                                      format, type, pixels)) {
 853          _mesa_error(ctx, GL_INVALID_OPERATION,
 854                      "glDrawPixels(invalid PBO access)");
 855          goto end;
 856       }
 857       buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
 858                                               GL_READ_ONLY_ARB,
 859                                               unpack->BufferObj);
 860       if (!buf) {
 861          /* buffer is already mapped - that's an error */
 862          _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawPixels(PBO is mapped)");
 863          goto end;
 864       }
 865       pixels = ADD_POINTERS(buf, pixels);
 866    }
 867
 868    switch (format) {
 869    case GL_STENCIL_INDEX:
 870       draw_stencil_pixels( ctx, x, y, width, height, type, unpack, pixels );
 871       break;
 872    case GL_DEPTH_COMPONENT:
 873       draw_depth_pixels( ctx, x, y, width, height, type, unpack, pixels );
 874       break;
 875    case GL_COLOR_INDEX:
 876       if (ctx->Visual.rgbMode)
 877          draw_rgba_pixels(ctx, x,y, width, height, format, type, unpack, pixels);
 878       else
 879          draw_index_pixels(ctx, x, y, width, height, type, unpack, pixels);
 880       break;
 881    case GL_RED:
 882    case GL_GREEN:
 883    case GL_BLUE:
 884    case GL_ALPHA:
 885    case GL_LUMINANCE:
 886    case GL_LUMINANCE_ALPHA:
 887    case GL_RGB:
 888    case GL_BGR:
 889    case GL_RGBA:
 890    case GL_BGRA:
 891    case GL_ABGR_EXT:
 892       draw_rgba_pixels(ctx, x, y, width, height, format, type, unpack, pixels);
 893       break;
 894    case GL_DEPTH_STENCIL_EXT:
 895       draw_depth_stencil_pixels(ctx, x, y, width, height,
 896                                 type, unpack, pixels);
 897       break;
 898    default:
 899       _mesa_problem(ctx, "unexpected format in _swrast_DrawPixels");
 900       /* don't return yet, clean-up */
 901    }
 902
 903 end:
 904
 905    RENDER_FINISH(swrast,ctx);
 906
 907    if (unpack->BufferObj->Name) {
 908       /* done with PBO so unmap it now */
 909       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
 910                               unpack->BufferObj);
 911    }
 912 }
 913
 914
 915
 916 #if 0  /* experimental */
 917 /*
 918  * Execute glDrawDepthPixelsMESA().
 919  */
 920 void
 921 _swrast_DrawDepthPixelsMESA( GLcontext *ctx,
 922                              GLint x, GLint y,
 923                              GLsizei width, GLsizei height,
 924                              GLenum colorFormat, GLenum colorType,
 925                              const GLvoid *colors,
 926                              GLenum depthType, const GLvoid *depths,
 927                              const struct gl_pixelstore_attrib *unpack )
 928 {
 929    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 930
 931    if (swrast->NewState)
 932       _swrast_validate_derived( ctx );
 933
 934    RENDER_START(swrast,ctx);
 935
 936    switch (colorFormat) {
 937    case GL_COLOR_INDEX:
 938       if (ctx->Visual.rgbMode)
 939          draw_rgba_pixels(ctx, x,y, width, height, colorFormat, colorType,
 940                           unpack, colors);
 941       else
 942          draw_index_pixels(ctx, x, y, width, height, colorType,
 943                            unpack, colors);
 944       break;
 945    case GL_RED:
 946    case GL_GREEN:
 947    case GL_BLUE:
 948    case GL_ALPHA:
 949    case GL_LUMINANCE:
 950    case GL_LUMINANCE_ALPHA:
 951    case GL_RGB:
 952    case GL_BGR:
 953    case GL_RGBA:
 954    case GL_BGRA:
 955    case GL_ABGR_EXT:
 956       draw_rgba_pixels(ctx, x, y, width, height, colorFormat, colorType,
 957                        unpack, colors);
 958       break;
 959    default:
 960       _mesa_problem(ctx, "unexpected format in glDrawDepthPixelsMESA");
 961    }
 962
 963    RENDER_FINISH(swrast,ctx);
 964 }
 965 #endif