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/colormac.h"
  29 #include "main/condrender.h"
  30 #include "main/context.h"
  31 #include "main/format_pack.h"
  32 #include "main/image.h"
  33 #include "main/imports.h"
  34 #include "main/macros.h"
  35 #include "main/pack.h"
  36 #include "main/pbo.h"
  37 #include "main/pixeltransfer.h"
  38 #include "main/state.h"
  39
  40 #include "s_context.h"
  41 #include "s_span.h"
  42 #include "s_stencil.h"
  43 #include "s_zoom.h"
  44
  45
  46 /**
  47  * Handle a common case of drawing GL_RGB/GL_UNSIGNED_BYTE into a
  48  * MESA_FORMAT_XRGB888 or MESA_FORMAT_ARGB888 renderbuffer.
  49  */
  50 static void
  51 fast_draw_rgb_ubyte_pixels(struct gl_context *ctx,
  52                            struct gl_renderbuffer *rb,
  53                            GLint x, GLint y,
  54                            GLsizei width, GLsizei height,
  55                            const struct gl_pixelstore_attrib *unpack,
  56                            const GLvoid *pixels)
  57 {
  58    const GLubyte *src = (const GLubyte *)
  59       _mesa_image_address2d(unpack, pixels, width,
  60                             height, GL_RGB, GL_UNSIGNED_BYTE, 0, 0);
  61    const GLint srcRowStride = _mesa_image_row_stride(unpack, width,
  62                                                      GL_RGB, GL_UNSIGNED_BYTE);
  63    GLint i, j;
  64    GLubyte *dst;
  65    GLint dstRowStride;
  66
  67    ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height,
  68                                GL_MAP_WRITE_BIT, &dst, &dstRowStride);
  69
  70    if (!dst) {
  71       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
  72       return;
  73    }
  74
  75    if (ctx->Pixel.ZoomY == -1.0f) {
  76       dst = dst + (height - 1) * dstRowStride;
  77       dstRowStride = -dstRowStride;
  78    }
  79
  80    for (i = 0; i < height; i++) {
  81       GLuint *dst4 = (GLuint *) dst;
  82       for (j = 0; j < width; j++) {
  83          dst4[j] = PACK_COLOR_8888(0xff, src[j*3+0], src[j*3+1], src[j*3+2]);
  84       }
  85       dst += dstRowStride;
  86       src += srcRowStride;
  87    }
  88
  89    ctx->Driver.UnmapRenderbuffer(ctx, rb);
  90 }
  91
  92
  93 /**
  94  * Handle a common case of drawing GL_RGBA/GL_UNSIGNED_BYTE into a
  95  * MESA_FORMAT_ARGB888 or MESA_FORMAT_xRGB888 renderbuffer.
  96  */
  97 static void
  98 fast_draw_rgba_ubyte_pixels(struct gl_context *ctx,
  99                            struct gl_renderbuffer *rb,
 100                            GLint x, GLint y,
 101                            GLsizei width, GLsizei height,
 102                            const struct gl_pixelstore_attrib *unpack,
 103                            const GLvoid *pixels)
 104 {
 105    const GLubyte *src = (const GLubyte *)
 106       _mesa_image_address2d(unpack, pixels, width,
 107                             height, GL_RGBA, GL_UNSIGNED_BYTE, 0, 0);
 108    const GLint srcRowStride =
 109       _mesa_image_row_stride(unpack, width, GL_RGBA, GL_UNSIGNED_BYTE);
 110    GLint i, j;
 111    GLubyte *dst;
 112    GLint dstRowStride;
 113
 114    ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height,
 115                                GL_MAP_WRITE_BIT, &dst, &dstRowStride);
 116
 117    if (!dst) {
 118       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 119       return;
 120    }
 121
 122    if (ctx->Pixel.ZoomY == -1.0f) {
 123       dst = dst + (height - 1) * dstRowStride;
 124       dstRowStride = -dstRowStride;
 125    }
 126
 127    for (i = 0; i < height; i++) {
 128       GLuint *dst4 = (GLuint *) dst;
 129       for (j = 0; j < width; j++) {
 130          dst4[j] = PACK_COLOR_8888(src[j*4+3], src[j*4+0],
 131                                    src[j*4+1], src[j*4+2]);
 132       }
 133       dst += dstRowStride;
 134       src += srcRowStride;
 135    }
 136
 137    ctx->Driver.UnmapRenderbuffer(ctx, rb);
 138 }
 139
 140
 141 /**
 142  * Handle a common case of drawing a format/type combination that
 143  * exactly matches the renderbuffer format.
 144  */
 145 static void
 146 fast_draw_generic_pixels(struct gl_context *ctx,
 147                          struct gl_renderbuffer *rb,
 148                          GLint x, GLint y,
 149                          GLsizei width, GLsizei height,
 150                          GLenum format, GLenum type,
 151                          const struct gl_pixelstore_attrib *unpack,
 152                          const GLvoid *pixels)
 153 {
 154    const GLubyte *src = (const GLubyte *)
 155       _mesa_image_address2d(unpack, pixels, width,
 156                             height, format, type, 0, 0);
 157    const GLint srcRowStride =
 158       _mesa_image_row_stride(unpack, width, format, type);
 159    const GLint rowLength = width * _mesa_get_format_bytes(rb->Format);
 160    GLint i;
 161    GLubyte *dst;
 162    GLint dstRowStride;
 163
 164    ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height,
 165                                GL_MAP_WRITE_BIT, &dst, &dstRowStride);
 166
 167    if (!dst) {
 168       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glDrawPixels");
 169       return;
 170    }
 171
 172    if (ctx->Pixel.ZoomY == -1.0f) {
 173       dst = dst + (height - 1) * dstRowStride;
 174       dstRowStride = -dstRowStride;
 175    }
 176
 177    for (i = 0; i < height; i++) {
 178       memcpy(dst, src, rowLength);
 179       dst += dstRowStride;
 180       src += srcRowStride;
 181    }
 182
 183    ctx->Driver.UnmapRenderbuffer(ctx, rb);
 184 }
 185
 186
 187 /**
 188  * Try to do a fast and simple RGB(a) glDrawPixels.
 189  * Return:  GL_TRUE if success, GL_FALSE if slow path must be used instead
 190  */
 191 static GLboolean
 192 fast_draw_rgba_pixels(struct gl_context *ctx, GLint x, GLint y,
 193                       GLsizei width, GLsizei height,
 194                       GLenum format, GLenum type,
 195                       const struct gl_pixelstore_attrib *userUnpack,
 196                       const GLvoid *pixels)
 197 {
 198    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
 199    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 200    struct gl_pixelstore_attrib unpack;
 201
 202    if (!rb)
 203       return GL_TRUE; /* no-op */
 204
 205    if (ctx->DrawBuffer->_NumColorDrawBuffers > 1 ||
 206        (swrast->_RasterMask & ~CLIP_BIT) ||
 207        ctx->Texture._EnabledCoordUnits ||
 208        userUnpack->SwapBytes ||
 209        ctx->Pixel.ZoomX != 1.0f ||
 210        fabsf(ctx->Pixel.ZoomY) != 1.0f ||
 211        ctx->_ImageTransferState) {
 212       /* can't handle any of those conditions */
 213       return GL_FALSE;
 214    }
 215
 216    unpack = *userUnpack;
 217
 218    /* clipping */
 219    if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height, &unpack)) {
 220       /* image was completely clipped: no-op, all done */
 221       return GL_TRUE;
 222    }
 223
 224    if (format == GL_RGB &&
 225        type == GL_UNSIGNED_BYTE &&
 226        (rb->Format == MESA_FORMAT_XRGB8888 ||
 227         rb->Format == MESA_FORMAT_ARGB8888)) {
 228       fast_draw_rgb_ubyte_pixels(ctx, rb, x, y, width, height,
 229                                  &unpack, pixels);
 230       return GL_TRUE;
 231    }
 232
 233    if (format == GL_RGBA &&
 234        type == GL_UNSIGNED_BYTE &&
 235        (rb->Format == MESA_FORMAT_XRGB8888 ||
 236         rb->Format == MESA_FORMAT_ARGB8888)) {
 237       fast_draw_rgba_ubyte_pixels(ctx, rb, x, y, width, height,
 238                                   &unpack, pixels);
 239       return GL_TRUE;
 240    }
 241
 242    if (_mesa_format_matches_format_and_type(rb->Format, format, type)) {
 243       fast_draw_generic_pixels(ctx, rb, x, y, width, height,
 244                                format, type, &unpack, pixels);
 245       return GL_TRUE;
 246    }
 247
 248    /* can't handle this pixel format and/or data type */
 249    return GL_FALSE;
 250 }
 251
 252
 253
 254 /*
 255  * Draw stencil image.
 256  */
 257 static void
 258 draw_stencil_pixels( struct gl_context *ctx, GLint x, GLint y,
 259                      GLsizei width, GLsizei height,
 260                      GLenum type,
 261                      const struct gl_pixelstore_attrib *unpack,
 262                      const GLvoid *pixels )
 263 {
 264    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 265    const GLenum destType = GL_UNSIGNED_BYTE;
 266    GLint skipPixels;
 267
 268    /* if width > MAX_WIDTH, have to process image in chunks */
 269    skipPixels = 0;
 270    while (skipPixels < width) {
 271       const GLint spanX = x + skipPixels;
 272       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 273       GLint row;
 274       for (row = 0; row < height; row++) {
 275          const GLint spanY = y + row;
 276          GLubyte values[MAX_WIDTH];
 277          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 278                                                       width, height,
 279                                                       GL_STENCIL_INDEX, type,
 280                                                       row, skipPixels);
 281          _mesa_unpack_stencil_span(ctx, spanWidth, destType, values,
 282                                    type, source, unpack,
 283                                    ctx->_ImageTransferState);
 284          if (zoom) {
 285             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 286                                               spanX, spanY, values);
 287          }
 288          else {
 289             _swrast_write_stencil_span(ctx, spanWidth, spanX, spanY, values);
 290          }
 291       }
 292       skipPixels += spanWidth;
 293    }
 294 }
 295
 296
 297 /*
 298  * Draw depth image.
 299  */
 300 static void
 301 draw_depth_pixels( struct gl_context *ctx, GLint x, GLint y,
 302                    GLsizei width, GLsizei height,
 303                    GLenum type,
 304                    const struct gl_pixelstore_attrib *unpack,
 305                    const GLvoid *pixels )
 306 {
 307    const GLboolean scaleOrBias
 308       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 309    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 310    SWspan span;
 311
 312    INIT_SPAN(span, GL_BITMAP);
 313    span.arrayMask = SPAN_Z;
 314    _swrast_span_default_attribs(ctx, &span);
 315
 316    if (type == GL_UNSIGNED_SHORT
 317        && ctx->DrawBuffer->Visual.depthBits == 16
 318        && !scaleOrBias
 319        && !zoom
 320        && width <= MAX_WIDTH
 321        && !unpack->SwapBytes) {
 322       /* Special case: directly write 16-bit depth values */
 323       GLint row;
 324       for (row = 0; row < height; row++) {
 325          const GLushort *zSrc = (const GLushort *)
 326             _mesa_image_address2d(unpack, pixels, width, height,
 327                                   GL_DEPTH_COMPONENT, type, row, 0);
 328          GLint i;
 329          for (i = 0; i < width; i++)
 330             span.array->z[i] = zSrc[i];
 331          span.x = x;
 332          span.y = y + row;
 333          span.end = width;
 334          _swrast_write_rgba_span(ctx, &span);
 335       }
 336    }
 337    else if (type == GL_UNSIGNED_INT
 338             && !scaleOrBias
 339             && !zoom
 340             && width <= MAX_WIDTH
 341             && !unpack->SwapBytes) {
 342       /* Special case: shift 32-bit values down to Visual.depthBits */
 343       const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
 344       GLint row;
 345       for (row = 0; row < height; row++) {
 346          const GLuint *zSrc = (const GLuint *)
 347             _mesa_image_address2d(unpack, pixels, width, height,
 348                                   GL_DEPTH_COMPONENT, type, row, 0);
 349          if (shift == 0) {
 350             memcpy(span.array->z, zSrc, width * sizeof(GLuint));
 351          }
 352          else {
 353             GLint col;
 354             for (col = 0; col < width; col++)
 355                span.array->z[col] = zSrc[col] >> shift;
 356          }
 357          span.x = x;
 358          span.y = y + row;
 359          span.end = width;
 360          _swrast_write_rgba_span(ctx, &span);
 361       }
 362    }
 363    else {
 364       /* General case */
 365       const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
 366       GLint skipPixels = 0;
 367
 368       /* in case width > MAX_WIDTH do the copy in chunks */
 369       while (skipPixels < width) {
 370          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 371          GLint row;
 372          ASSERT(span.end <= MAX_WIDTH);
 373          for (row = 0; row < height; row++) {
 374             const GLvoid *zSrc = _mesa_image_address2d(unpack,
 375                                                       pixels, width, height,
 376                                                       GL_DEPTH_COMPONENT, type,
 377                                                       row, skipPixels);
 378
 379             /* Set these for each row since the _swrast_write_* function may
 380              * change them while clipping.
 381              */
 382             span.x = x + skipPixels;
 383             span.y = y + row;
 384             span.end = spanWidth;
 385
 386             _mesa_unpack_depth_span(ctx, spanWidth,
 387                                     GL_UNSIGNED_INT, span.array->z, depthMax,
 388                                     type, zSrc, unpack);
 389             if (zoom) {
 390                _swrast_write_zoomed_depth_span(ctx, x, y, &span);
 391             }
 392             else {
 393                _swrast_write_rgba_span(ctx, &span);
 394             }
 395          }
 396          skipPixels += spanWidth;
 397       }
 398    }
 399 }
 400
 401
 402
 403 /**
 404  * Draw RGBA image.
 405  */
 406 static void
 407 draw_rgba_pixels( struct gl_context *ctx, GLint x, GLint y,
 408                   GLsizei width, GLsizei height,
 409                   GLenum format, GLenum type,
 410                   const struct gl_pixelstore_attrib *unpack,
 411                   const GLvoid *pixels )
 412 {
 413    const GLint imgX = x, imgY = y;
 414    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
 415    GLfloat *convImage = NULL;
 416    GLbitfield transferOps = ctx->_ImageTransferState;
 417    SWspan span;
 418
 419    /* Try an optimized glDrawPixels first */
 420    if (fast_draw_rgba_pixels(ctx, x, y, width, height, format, type,
 421                              unpack, pixels)) {
 422       return;
 423    }
 424
 425    swrast_render_start(ctx);
 426
 427    INIT_SPAN(span, GL_BITMAP);
 428    _swrast_span_default_attribs(ctx, &span);
 429    span.arrayMask = SPAN_RGBA;
 430    span.arrayAttribs = FRAG_BIT_COL0; /* we're fill in COL0 attrib values */
 431
 432    if (ctx->DrawBuffer->_NumColorDrawBuffers > 0) {
 433       GLenum datatype = _mesa_get_format_datatype(
 434                  ctx->DrawBuffer->_ColorDrawBuffers[0]->Format);
 435       if (datatype != GL_FLOAT &&
 436           ctx->Color.ClampFragmentColor != GL_FALSE) {
 437          /* need to clamp colors before applying fragment ops */
 438          transferOps |= IMAGE_CLAMP_BIT;
 439       }
 440    }
 441
 442    /*
 443     * General solution
 444     */
 445    {
 446       const GLbitfield interpMask = span.interpMask;
 447       const GLbitfield arrayMask = span.arrayMask;
 448       const GLint srcStride
 449          = _mesa_image_row_stride(unpack, width, format, type);
 450       GLint skipPixels = 0;
 451       /* use span array for temp color storage */
 452       GLfloat *rgba = (GLfloat *) span.array->attribs[FRAG_ATTRIB_COL0];
 453
 454       /* if the span is wider than MAX_WIDTH we have to do it in chunks */
 455       while (skipPixels < width) {
 456          const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 457          const GLubyte *source
 458             = (const GLubyte *) _mesa_image_address2d(unpack, pixels,
 459                                                       width, height, format,
 460                                                       type, 0, skipPixels);
 461          GLint row;
 462
 463          for (row = 0; row < height; row++) {
 464             /* get image row as float/RGBA */
 465             _mesa_unpack_color_span_float(ctx, spanWidth, GL_RGBA, rgba,
 466                                      format, type, source, unpack,
 467                                      transferOps);
 468             /* Set these for each row since the _swrast_write_* functions
 469              * may change them while clipping/rendering.
 470              */
 471             span.array->ChanType = GL_FLOAT;
 472             span.x = x + skipPixels;
 473             span.y = y + row;
 474             span.end = spanWidth;
 475             span.arrayMask = arrayMask;
 476             span.interpMask = interpMask;
 477             if (zoom) {
 478                _swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, rgba);
 479             }
 480             else {
 481                _swrast_write_rgba_span(ctx, &span);
 482             }
 483
 484             source += srcStride;
 485          } /* for row */
 486
 487          skipPixels += spanWidth;
 488       } /* while skipPixels < width */
 489
 490       /* XXX this is ugly/temporary, to undo above change */
 491       span.array->ChanType = CHAN_TYPE;
 492    }
 493
 494    if (convImage) {
 495       free(convImage);
 496    }
 497
 498    swrast_render_finish(ctx);
 499 }
 500
 501
 502 /**
 503  * Draw depth+stencil values into a MESA_FORAMT_Z24_S8 or MESA_FORMAT_S8_Z24
 504  * renderbuffer.  No masking, zooming, scaling, etc.
 505  */
 506 static void
 507 fast_draw_depth_stencil(struct gl_context *ctx, GLint x, GLint y,
 508                         GLsizei width, GLsizei height,
 509                         const struct gl_pixelstore_attrib *unpack,
 510                         const GLvoid *pixels)
 511 {
 512    const GLenum format = GL_DEPTH_STENCIL_EXT;
 513    const GLenum type = GL_UNSIGNED_INT_24_8;
 514    struct gl_renderbuffer *rb =
 515       ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 516    struct swrast_renderbuffer *srb = swrast_renderbuffer(rb);
 517    GLubyte *src, *dst;
 518    GLint srcRowStride, dstRowStride;
 519    GLint i;
 520
 521    src = _mesa_image_address2d(unpack, pixels, width, height,
 522                                format, type, 0, 0);
 523    srcRowStride = _mesa_image_row_stride(unpack, width, format, type);
 524
 525    dst = _swrast_pixel_address(rb, x, y);
 526    dstRowStride = srb->RowStride;
 527
 528    for (i = 0; i < height; i++) {
 529       _mesa_pack_uint_24_8_depth_stencil_row(rb->Format, width,
 530                                              (const GLuint *) src, dst);
 531       dst += dstRowStride;
 532       src += srcRowStride;
 533    }
 534 }
 535
 536
 537
 538 /**
 539  * This is a bit different from drawing GL_DEPTH_COMPONENT pixels.
 540  * The only per-pixel operations that apply are depth scale/bias,
 541  * stencil offset/shift, GL_DEPTH_WRITEMASK and GL_STENCIL_WRITEMASK,
 542  * and pixel zoom.
 543  * Also, only the depth buffer and stencil buffers are touched, not the
 544  * color buffer(s).
 545  */
 546 static void
 547 draw_depth_stencil_pixels(struct gl_context *ctx, GLint x, GLint y,
 548                           GLsizei width, GLsizei height, GLenum type,
 549                           const struct gl_pixelstore_attrib *unpack,
 550                           const GLvoid *pixels)
 551 {
 552    const GLint imgX = x, imgY = y;
 553    const GLboolean scaleOrBias
 554       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 555    const GLuint stencilMask = ctx->Stencil.WriteMask[0];
 556    const GLenum stencilType = GL_UNSIGNED_BYTE;
 557    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 558    struct gl_renderbuffer *depthRb, *stencilRb;
 559    struct gl_pixelstore_attrib clippedUnpack = *unpack;
 560
 561    if (!zoom) {
 562       if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
 563                                  &clippedUnpack)) {
 564          /* totally clipped */
 565          return;
 566       }
 567    }
 568
 569    depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 570    stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 571    ASSERT(depthRb);
 572    ASSERT(stencilRb);
 573
 574    if (depthRb == stencilRb &&
 575        (depthRb->Format == MESA_FORMAT_Z24_S8 ||
 576         depthRb->Format == MESA_FORMAT_S8_Z24) &&
 577        type == GL_UNSIGNED_INT_24_8 &&
 578        !scaleOrBias &&
 579        !zoom &&
 580        ctx->Depth.Mask &&
 581        (stencilMask & 0xff) == 0xff) {
 582       fast_draw_depth_stencil(ctx, x, y, width, height,
 583                               &clippedUnpack, pixels);
 584    }
 585    else {
 586       /* sub-optimal cases:
 587        * Separate depth/stencil buffers, or pixel transfer ops required.
 588        */
 589       /* XXX need to handle very wide images (skippixels) */
 590       GLint i;
 591
 592       for (i = 0; i < height; i++) {
 593          const GLuint *depthStencilSrc = (const GLuint *)
 594             _mesa_image_address2d(&clippedUnpack, pixels, width, height,
 595                                   GL_DEPTH_STENCIL_EXT, type, i, 0);
 596
 597          if (ctx->Depth.Mask) {
 598             GLuint zValues[MAX_WIDTH];  /* 32-bit Z values */
 599             _mesa_unpack_depth_span(ctx, width,
 600                                     GL_UNSIGNED_INT, /* dest type */
 601                                     zValues,         /* dest addr */
 602                                     0xffffffff,      /* depth max */
 603                                     type,            /* src type */
 604                                     depthStencilSrc, /* src addr */
 605                                     &clippedUnpack);
 606             if (zoom) {
 607                _swrast_write_zoomed_z_span(ctx, imgX, imgY, width, x,
 608                                            y + i, zValues);
 609             }
 610             else {
 611                GLubyte *dst = _swrast_pixel_address(depthRb, x, y + i);
 612                _mesa_pack_uint_z_row(depthRb->Format, width, zValues, dst);
 613             }
 614          }
 615
 616          if (stencilMask != 0x0) {
 617             GLubyte stencilValues[MAX_WIDTH];
 618             /* get stencil values, with shift/offset/mapping */
 619             _mesa_unpack_stencil_span(ctx, width, stencilType, stencilValues,
 620                                       type, depthStencilSrc, &clippedUnpack,
 621                                       ctx->_ImageTransferState);
 622             if (zoom)
 623                _swrast_write_zoomed_stencil_span(ctx, imgX, imgY, width,
 624                                                   x, y + i, stencilValues);
 625             else
 626                _swrast_write_stencil_span(ctx, width, x, y + i, stencilValues);
 627          }
 628       }
 629    }
 630 }
 631
 632
 633 /**
 634  * Execute software-based glDrawPixels.
 635  * By time we get here, all error checking will have been done.
 636  */
 637 void
 638 _swrast_DrawPixels( struct gl_context *ctx,
 639                     GLint x, GLint y,
 640                     GLsizei width, GLsizei height,
 641                     GLenum format, GLenum type,
 642                     const struct gl_pixelstore_attrib *unpack,
 643                     const GLvoid *pixels )
 644 {
 645    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 646    GLboolean save_vp_override = ctx->VertexProgram._Overriden;
 647
 648    if (!_mesa_check_conditional_render(ctx))
 649       return; /* don't draw */
 650
 651    /* We are creating fragments directly, without going through vertex
 652     * programs.
 653     *
 654     * This override flag tells the fragment processing code that its input
 655     * comes from a non-standard source, and it may therefore not rely on
 656     * optimizations that assume e.g. constant color if there is no color
 657     * vertex array.
 658     */
 659    _mesa_set_vp_override(ctx, GL_TRUE);
 660
 661    if (ctx->NewState)
 662       _mesa_update_state(ctx);
 663
 664    if (swrast->NewState)
 665       _swrast_validate_derived( ctx );
 666
 667    pixels = _mesa_map_pbo_source(ctx, unpack, pixels);
 668    if (!pixels) {
 669       _mesa_set_vp_override(ctx, save_vp_override);
 670       return;
 671    }
 672
 673    /*
 674     * By time we get here, all error checking should have been done.
 675     */
 676    switch (format) {
 677    case GL_STENCIL_INDEX:
 678       swrast_render_start(ctx);
 679       draw_stencil_pixels( ctx, x, y, width, height, type, unpack, pixels );
 680       swrast_render_finish(ctx);
 681       break;
 682    case GL_DEPTH_COMPONENT:
 683       swrast_render_start(ctx);
 684       draw_depth_pixels( ctx, x, y, width, height, type, unpack, pixels );
 685       swrast_render_finish(ctx);
 686       break;
 687    case GL_DEPTH_STENCIL_EXT:
 688       swrast_render_start(ctx);
 689       draw_depth_stencil_pixels(ctx, x, y, width, height, type, unpack, pixels);
 690       swrast_render_finish(ctx);
 691       break;
 692    default:
 693       /* all other formats should be color formats */
 694       draw_rgba_pixels(ctx, x, y, width, height, format, type, unpack, pixels);
 695    }
 696
 697    _mesa_set_vp_override(ctx, save_vp_override);
 698
 699    _mesa_unmap_pbo_source(ctx, unpack);
 700 }