src/mesa/swrast/s_copypix.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 "context.h"
  28 #include "colormac.h"
  29 #include "convolve.h"
  30 #include "histogram.h"
  31 #include "image.h"
  32 #include "macros.h"
  33 #include "imports.h"
  34 #include "pixel.h"
  35
  36 #include "s_context.h"
  37 #include "s_depth.h"
  38 #include "s_span.h"
  39 #include "s_stencil.h"
  40 #include "s_zoom.h"
  41
  42
  43
  44 /**
  45  * Determine if there's overlap in an image copy.
  46  * This test also compensates for the fact that copies are done from
  47  * bottom to top and overlaps can sometimes be handled correctly
  48  * without making a temporary image copy.
  49  * \return GL_TRUE if the regions overlap, GL_FALSE otherwise.
  50  */
  51 static GLboolean
  52 regions_overlap(GLint srcx, GLint srcy,
  53                 GLint dstx, GLint dsty,
  54                 GLint width, GLint height,
  55                 GLfloat zoomX, GLfloat zoomY)
  56 {
  57    if (zoomX == 1.0 && zoomY == 1.0) {
  58       /* no zoom */
  59       if (srcx >= dstx + width || (srcx + width <= dstx)) {
  60          return GL_FALSE;
  61       }
  62       else if (srcy < dsty) { /* this is OK */
  63          return GL_FALSE;
  64       }
  65       else if (srcy > dsty + height) {
  66          return GL_FALSE;
  67       }
  68       else {
  69          return GL_TRUE;
  70       }
  71    }
  72    else {
  73       /* add one pixel of slop when zooming, just to be safe */
  74       if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
  75          return GL_FALSE;
  76       }
  77       else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
  78          return GL_FALSE;
  79       }
  80       else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
  81          return GL_FALSE;
  82       }
  83       else {
  84          return GL_TRUE;
  85       }
  86    }
  87 }
  88
  89
  90 /**
  91  * RGBA copypixels with convolution.
  92  */
  93 static void
  94 copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
  95                       GLint width, GLint height, GLint destx, GLint desty)
  96 {
  97    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  98    GLint row;
  99    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 100    const GLbitfield transferOps = ctx->_ImageTransferState;
 101    const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
 102       || (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
 103    GLfloat *dest, *tmpImage, *convImage;
 104    SWspan span;
 105
 106    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
 107
 108    if (ctx->Depth.Test)
 109       _swrast_span_default_z(ctx, &span);
 110    if (swrast->_FogEnabled)
 111       _swrast_span_default_fog(ctx, &span);
 112
 113
 114    /* allocate space for GLfloat image */
 115    tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 116    if (!tmpImage) {
 117       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 118       return;
 119    }
 120    convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 121    if (!convImage) {
 122       _mesa_free(tmpImage);
 123       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 124       return;
 125    }
 126
 127    /* read source image as float/RGBA */
 128    dest = tmpImage;
 129    for (row = 0; row < height; row++) {
 130       _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
 131                              width, srcx, srcy + row, GL_FLOAT, dest);
 132       dest += 4 * width;
 133    }
 134
 135    /* do the image transfer ops which preceed convolution */
 136    for (row = 0; row < height; row++) {
 137       GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
 138       _mesa_apply_rgba_transfer_ops(ctx,
 139                                     transferOps & IMAGE_PRE_CONVOLUTION_BITS,
 140                                     width, rgba);
 141    }
 142
 143    /* do convolution */
 144    if (ctx->Pixel.Convolution2DEnabled) {
 145       _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
 146    }
 147    else {
 148       ASSERT(ctx->Pixel.Separable2DEnabled);
 149       _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
 150    }
 151    _mesa_free(tmpImage);
 152
 153    /* do remaining post-convolution image transfer ops */
 154    for (row = 0; row < height; row++) {
 155       GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
 156       _mesa_apply_rgba_transfer_ops(ctx,
 157                                     transferOps & IMAGE_POST_CONVOLUTION_BITS,
 158                                     width, rgba);
 159    }
 160
 161    if (!sink) {
 162       /* write the new image */
 163       for (row = 0; row < height; row++) {
 164          const GLfloat *src = convImage + row * width * 4;
 165          GLvoid *rgba = span.array->color.sz1.rgba; /* row storage */
 166
 167          /* copy convolved colors into span array */
 168          _mesa_memcpy(rgba, src, width * 4 * sizeof(GLfloat));
 169
 170          /* write span */
 171          span.x = destx;
 172          span.y = desty + row;
 173          span.end = width;
 174          span.array->ChanType = GL_FLOAT;
 175          if (zoom) {
 176             _swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
 177          }
 178          else {
 179             _swrast_write_rgba_span(ctx, &span);
 180          }
 181       }
 182       /* restore this */
 183       span.array->ChanType = CHAN_TYPE;
 184    }
 185
 186    _mesa_free(convImage);
 187 }
 188
 189
 190 /**
 191  * RGBA copypixels
 192  */
 193 static void
 194 copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 195                  GLint width, GLint height, GLint destx, GLint desty)
 196 {
 197    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 198    GLfloat *tmpImage, *p;
 199    GLint sy, dy, stepy, row;
 200    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 201    GLint overlapping;
 202    const GLuint transferOps = ctx->_ImageTransferState;
 203    SWspan span;
 204
 205    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 206       /* no readbuffer - OK */
 207       return;
 208    }
 209
 210    if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
 211       copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
 212       return;
 213    }
 214
 215    /* Determine if copy should be done bottom-to-top or top-to-bottom */
 216    if (srcy < desty) {
 217       /* top-down  max-to-min */
 218       sy = srcy + height - 1;
 219       dy = desty + height - 1;
 220       stepy = -1;
 221    }
 222    else {
 223       /* bottom-up  min-to-max */
 224       sy = srcy;
 225       dy = desty;
 226       stepy = 1;
 227    }
 228
 229    if (ctx->DrawBuffer == ctx->ReadBuffer) {
 230       overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 231                                     ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 232    }
 233    else {
 234       overlapping = GL_FALSE;
 235    }
 236
 237    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
 238    if (ctx->Depth.Test)
 239       _swrast_span_default_z(ctx, &span);
 240    if (swrast->_FogEnabled)
 241       _swrast_span_default_fog(ctx, &span);
 242
 243    if (overlapping) {
 244       tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat) * 4);
 245       if (!tmpImage) {
 246          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 247          return;
 248       }
 249       /* read the source image as RGBA/float */
 250       p = tmpImage;
 251       for (row = 0; row < height; row++) {
 252          _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 253                                  width, srcx, sy + row, GL_FLOAT, p );
 254          p += width * 4;
 255       }
 256       p = tmpImage;
 257    }
 258    else {
 259       tmpImage = NULL;  /* silence compiler warnings */
 260       p = NULL;
 261    }
 262
 263    ASSERT(width < MAX_WIDTH);
 264
 265    for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
 266       GLvoid *rgba = span.array->color.sz4.rgba;
 267
 268       /* Get row/span of source pixels */
 269       if (overlapping) {
 270          /* get from buffered image */
 271          _mesa_memcpy(rgba, p, width * sizeof(GLfloat) * 4);
 272          p += width * 4;
 273       }
 274       else {
 275          /* get from framebuffer */
 276          _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 277                                  width, srcx, sy, GL_FLOAT, rgba );
 278       }
 279
 280       if (transferOps) {
 281          _mesa_apply_rgba_transfer_ops(ctx, transferOps, width,
 282                                        (GLfloat (*)[4]) rgba);
 283       }
 284
 285       /* Write color span */
 286       span.x = destx;
 287       span.y = dy;
 288       span.end = width;
 289       span.array->ChanType = GL_FLOAT;
 290       if (zoom) {
 291          _swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
 292       }
 293       else {
 294          _swrast_write_rgba_span(ctx, &span);
 295       }
 296    }
 297
 298    span.array->ChanType = CHAN_TYPE; /* restore */
 299
 300    if (overlapping)
 301       _mesa_free(tmpImage);
 302 }
 303
 304
 305 static void
 306 copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 307                 GLint width, GLint height,
 308                 GLint destx, GLint desty )
 309 {
 310    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 311    GLuint *tmpImage,*p;
 312    GLint sy, dy, stepy;
 313    GLint j;
 314    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 315    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 316    GLint overlapping;
 317    SWspan span;
 318
 319    if (!ctx->ReadBuffer->_ColorReadBuffer) {
 320       /* no readbuffer - OK */
 321       return;
 322    }
 323
 324    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
 325
 326    /* Determine if copy should be bottom-to-top or top-to-bottom */
 327    if (srcy<desty) {
 328       /* top-down  max-to-min */
 329       sy = srcy + height - 1;
 330       dy = desty + height - 1;
 331       stepy = -1;
 332    }
 333    else {
 334       /* bottom-up  min-to-max */
 335       sy = srcy;
 336       dy = desty;
 337       stepy = 1;
 338    }
 339
 340    if (ctx->DrawBuffer == ctx->ReadBuffer) {
 341       overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 342                                     ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 343    }
 344    else {
 345       overlapping = GL_FALSE;
 346    }
 347
 348    if (ctx->Depth.Test)
 349       _swrast_span_default_z(ctx, &span);
 350    if (swrast->_FogEnabled)
 351       _swrast_span_default_fog(ctx, &span);
 352
 353    if (overlapping) {
 354       GLint ssy = sy;
 355       tmpImage = (GLuint *) _mesa_malloc(width * height * sizeof(GLuint));
 356       if (!tmpImage) {
 357          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 358          return;
 359       }
 360       /* read the image */
 361       p = tmpImage;
 362       for (j = 0; j < height; j++, ssy += stepy) {
 363          _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 364                                   width, srcx, ssy, p );
 365          p += width;
 366       }
 367       p = tmpImage;
 368    }
 369    else {
 370       tmpImage = NULL;  /* silence compiler warning */
 371       p = NULL;
 372    }
 373
 374    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 375       /* Get color indexes */
 376       if (overlapping) {
 377          _mesa_memcpy(span.array->index, p, width * sizeof(GLuint));
 378          p += width;
 379       }
 380       else {
 381          _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
 382                                   width, srcx, sy, span.array->index );
 383       }
 384
 385       /* Apply shift, offset, look-up table */
 386       if (shift_or_offset) {
 387          _mesa_shift_and_offset_ci( ctx, width, span.array->index );
 388       }
 389       if (ctx->Pixel.MapColorFlag) {
 390          _mesa_map_ci( ctx, width, span.array->index );
 391       }
 392
 393       /* write color indexes */
 394       span.x = destx;
 395       span.y = dy;
 396       span.end = width;
 397       if (zoom)
 398          _swrast_write_zoomed_index_span(ctx, destx, desty, &span);
 399       else
 400          _swrast_write_index_span(ctx, &span);
 401    }
 402
 403    if (overlapping)
 404       _mesa_free(tmpImage);
 405 }
 406
 407
 408 /**
 409  * Convert floating point Z values to integer Z values with pixel transfer's
 410  * Z scale and bias.
 411  */
 412 static void
 413 scale_and_bias_z(GLcontext *ctx, GLuint width,
 414                  const GLfloat depth[], GLuint z[])
 415 {
 416    const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
 417    GLuint i;
 418
 419    if (depthMax <= 0xffffff &&
 420        ctx->Pixel.DepthScale == 1.0 &&
 421        ctx->Pixel.DepthBias == 0.0) {
 422       /* no scale or bias and no clamping and no worry of overflow */
 423       const GLfloat depthMaxF = ctx->DrawBuffer->_DepthMaxF;
 424       for (i = 0; i < width; i++) {
 425          z[i] = (GLuint) (depth[i] * depthMaxF);
 426       }
 427    }
 428    else {
 429       /* need to be careful with overflow */
 430       const GLdouble depthMaxF = ctx->DrawBuffer->_DepthMaxF;
 431       for (i = 0; i < width; i++) {
 432          GLdouble d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
 433          d = CLAMP(d, 0.0, 1.0) * depthMaxF;
 434          if (d >= depthMaxF)
 435             z[i] = depthMax;
 436          else
 437             z[i] = (GLuint) d;
 438       }
 439    }
 440 }
 441
 442
 443
 444 /*
 445  * TODO: Optimize!!!!
 446  */
 447 static void
 448 copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 449                    GLint width, GLint height,
 450                    GLint destx, GLint desty )
 451 {
 452    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 453    struct gl_framebuffer *fb = ctx->ReadBuffer;
 454    struct gl_renderbuffer *readRb = fb->_DepthBuffer;
 455    GLfloat *p, *tmpImage;
 456    GLint sy, dy, stepy;
 457    GLint j;
 458    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 459    GLint overlapping;
 460    SWspan span;
 461
 462    if (!readRb) {
 463       /* no readbuffer - OK */
 464       return;
 465    }
 466
 467    INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
 468
 469    /* Determine if copy should be bottom-to-top or top-to-bottom */
 470    if (srcy<desty) {
 471       /* top-down  max-to-min */
 472       sy = srcy + height - 1;
 473       dy = desty + height - 1;
 474       stepy = -1;
 475    }
 476    else {
 477       /* bottom-up  min-to-max */
 478       sy = srcy;
 479       dy = desty;
 480       stepy = 1;
 481    }
 482
 483    if (ctx->DrawBuffer == ctx->ReadBuffer) {
 484       overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 485                                     ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 486    }
 487    else {
 488       overlapping = GL_FALSE;
 489    }
 490
 491    _swrast_span_default_color(ctx, &span);
 492    if (swrast->_FogEnabled)
 493       _swrast_span_default_fog(ctx, &span);
 494
 495    if (overlapping) {
 496       GLint ssy = sy;
 497       tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
 498       if (!tmpImage) {
 499          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 500          return;
 501       }
 502       p = tmpImage;
 503       for (j = 0; j < height; j++, ssy += stepy) {
 504          _swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
 505          p += width;
 506       }
 507       p = tmpImage;
 508    }
 509    else {
 510       tmpImage = NULL;  /* silence compiler warning */
 511       p = NULL;
 512    }
 513
 514    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 515       GLfloat depth[MAX_WIDTH];
 516       /* get depth values */
 517       if (overlapping) {
 518          _mesa_memcpy(depth, p, width * sizeof(GLfloat));
 519          p += width;
 520       }
 521       else {
 522          _swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
 523       }
 524
 525       /* apply scale and bias */
 526       scale_and_bias_z(ctx, width, depth, span.array->z);
 527
 528       /* write depth values */
 529       span.x = destx;
 530       span.y = dy;
 531       span.end = width;
 532       if (fb->Visual.rgbMode) {
 533          if (zoom)
 534             _swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
 535                                            span.array->rgba);
 536          else
 537             _swrast_write_rgba_span(ctx, &span);
 538       }
 539       else {
 540          if (zoom)
 541             _swrast_write_zoomed_index_span(ctx, destx, desty, &span);
 542          else
 543             _swrast_write_index_span(ctx, &span);
 544       }
 545    }
 546
 547    if (overlapping)
 548       _mesa_free(tmpImage);
 549 }
 550
 551
 552
 553 static void
 554 copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 555                      GLint width, GLint height,
 556                      GLint destx, GLint desty )
 557 {
 558    struct gl_framebuffer *fb = ctx->ReadBuffer;
 559    struct gl_renderbuffer *rb = fb->_StencilBuffer;
 560    GLint sy, dy, stepy;
 561    GLint j;
 562    GLstencil *p, *tmpImage;
 563    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 564    const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 565    GLint overlapping;
 566
 567    if (!rb) {
 568       /* no readbuffer - OK */
 569       return;
 570    }
 571
 572    /* Determine if copy should be bottom-to-top or top-to-bottom */
 573    if (srcy < desty) {
 574       /* top-down  max-to-min */
 575       sy = srcy + height - 1;
 576       dy = desty + height - 1;
 577       stepy = -1;
 578    }
 579    else {
 580       /* bottom-up  min-to-max */
 581       sy = srcy;
 582       dy = desty;
 583       stepy = 1;
 584    }
 585
 586    if (ctx->DrawBuffer == ctx->ReadBuffer) {
 587       overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
 588                                     ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 589    }
 590    else {
 591       overlapping = GL_FALSE;
 592    }
 593
 594    if (overlapping) {
 595       GLint ssy = sy;
 596       tmpImage = (GLstencil *) _mesa_malloc(width * height * sizeof(GLstencil));
 597       if (!tmpImage) {
 598          _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
 599          return;
 600       }
 601       p = tmpImage;
 602       for (j = 0; j < height; j++, ssy += stepy) {
 603          _swrast_read_stencil_span( ctx, rb, width, srcx, ssy, p );
 604          p += width;
 605       }
 606       p = tmpImage;
 607    }
 608    else {
 609       tmpImage = NULL;  /* silence compiler warning */
 610       p = NULL;
 611    }
 612
 613    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 614       GLstencil stencil[MAX_WIDTH];
 615
 616       /* Get stencil values */
 617       if (overlapping) {
 618          _mesa_memcpy(stencil, p, width * sizeof(GLstencil));
 619          p += width;
 620       }
 621       else {
 622          _swrast_read_stencil_span( ctx, rb, width, srcx, sy, stencil );
 623       }
 624
 625       /* Apply shift, offset, look-up table */
 626       if (shift_or_offset) {
 627          _mesa_shift_and_offset_stencil( ctx, width, stencil );
 628       }
 629       if (ctx->Pixel.MapStencilFlag) {
 630          _mesa_map_stencil( ctx, width, stencil );
 631       }
 632
 633       /* Write stencil values */
 634       if (zoom) {
 635          _swrast_write_zoomed_stencil_span(ctx, destx, desty, width,
 636                                            destx, dy, stencil);
 637       }
 638       else {
 639          _swrast_write_stencil_span( ctx, width, destx, dy, stencil );
 640       }
 641    }
 642
 643    if (overlapping)
 644       _mesa_free(tmpImage);
 645 }
 646
 647
 648 /**
 649  * This isn't terribly efficient.  If a driver really has combined
 650  * depth/stencil buffers the driver should implement an optimized
 651  * CopyPixels function.
 652  */
 653 static void
 654 copy_depth_stencil_pixels(GLcontext *ctx,
 655                           const GLint srcX, const GLint srcY,
 656                           const GLint width, const GLint height,
 657                           const GLint destX, const GLint destY)
 658 {
 659    struct gl_renderbuffer *stencilReadRb, *depthReadRb, *depthDrawRb;
 660    GLint sy, dy, stepy;
 661    GLint j;
 662    GLstencil *tempStencilImage = NULL, *stencilPtr = NULL;
 663    GLfloat *tempDepthImage = NULL, *depthPtr = NULL;
 664    const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
 665    const GLuint stencilMask = ctx->Stencil.WriteMask[0];
 666    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
 667    const GLboolean shiftOrOffset
 668       = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
 669    const GLboolean scaleOrBias
 670       = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
 671    GLint overlapping;
 672
 673    depthDrawRb = ctx->DrawBuffer->_DepthBuffer;
 674    depthReadRb = ctx->ReadBuffer->_DepthBuffer;
 675    stencilReadRb = ctx->ReadBuffer->_StencilBuffer;
 676
 677    ASSERT(depthDrawRb);
 678    ASSERT(depthReadRb);
 679    ASSERT(stencilReadRb);
 680
 681    /* Determine if copy should be bottom-to-top or top-to-bottom */
 682    if (srcY < destY) {
 683       /* top-down  max-to-min */
 684       sy = srcY + height - 1;
 685       dy = destY + height - 1;
 686       stepy = -1;
 687    }
 688    else {
 689       /* bottom-up  min-to-max */
 690       sy = srcY;
 691       dy = destY;
 692       stepy = 1;
 693    }
 694
 695    if (ctx->DrawBuffer == ctx->ReadBuffer) {
 696       overlapping = regions_overlap(srcX, srcY, destX, destY, width, height,
 697                                     ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
 698    }
 699    else {
 700       overlapping = GL_FALSE;
 701    }
 702
 703    if (overlapping) {
 704       GLint ssy = sy;
 705
 706       if (stencilMask != 0x0) {
 707          tempStencilImage
 708             = (GLstencil *) _mesa_malloc(width * height * sizeof(GLstencil));
 709          if (!tempStencilImage) {
 710             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 711             return;
 712          }
 713
 714          /* get copy of stencil pixels */
 715          stencilPtr = tempStencilImage;
 716          for (j = 0; j < height; j++, ssy += stepy) {
 717             _swrast_read_stencil_span(ctx, stencilReadRb,
 718                                       width, srcX, ssy, stencilPtr);
 719             stencilPtr += width;
 720          }
 721          stencilPtr = tempStencilImage;
 722       }
 723
 724       if (ctx->Depth.Mask) {
 725          tempDepthImage
 726             = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
 727          if (!tempDepthImage) {
 728             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
 729             _mesa_free(tempStencilImage);
 730             return;
 731          }
 732
 733          /* get copy of depth pixels */
 734          depthPtr = tempDepthImage;
 735          for (j = 0; j < height; j++, ssy += stepy) {
 736             _swrast_read_depth_span_float(ctx, depthReadRb,
 737                                           width, srcX, ssy, depthPtr);
 738             depthPtr += width;
 739          }
 740          depthPtr = tempDepthImage;
 741       }
 742    }
 743
 744    for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
 745       if (stencilMask != 0x0) {
 746          GLstencil stencil[MAX_WIDTH];
 747
 748          /* Get stencil values */
 749          if (overlapping) {
 750             _mesa_memcpy(stencil, stencilPtr, width * sizeof(GLstencil));
 751             stencilPtr += width;
 752          }
 753          else {
 754             _swrast_read_stencil_span(ctx, stencilReadRb,
 755                                       width, srcX, sy, stencil);
 756          }
 757
 758          /* Apply shift, offset, look-up table */
 759          if (shiftOrOffset) {
 760             _mesa_shift_and_offset_stencil(ctx, width, stencil);
 761          }
 762          if (ctx->Pixel.MapStencilFlag) {
 763             _mesa_map_stencil(ctx, width, stencil);
 764          }
 765
 766          /* Write values */
 767          if (zoom) {
 768             _swrast_write_zoomed_stencil_span(ctx, destX, destY, width,
 769                                               destX, dy, stencil);
 770          }
 771          else {
 772             _swrast_write_stencil_span( ctx, width, destX, dy, stencil );
 773          }
 774       }
 775
 776       if (ctx->Depth.Mask) {
 777          GLfloat depth[MAX_WIDTH];
 778          GLuint zVals32[MAX_WIDTH];
 779          GLushort zVals16[MAX_WIDTH];
 780          GLvoid *zVals;
 781          GLuint zBytes;
 782
 783          /* get depth values */
 784          if (overlapping) {
 785             _mesa_memcpy(depth, depthPtr, width * sizeof(GLfloat));
 786             depthPtr += width;
 787          }
 788          else {
 789             _swrast_read_depth_span_float(ctx, depthReadRb,
 790                                           width, srcX, sy, depth);
 791          }
 792
 793          /* scale & bias */
 794          if (scaleOrBias) {
 795             _mesa_scale_and_bias_depth(ctx, width, depth);
 796          }
 797          /* convert to integer Z values */
 798          if (depthDrawRb->DataType == GL_UNSIGNED_SHORT) {
 799             GLint k;
 800             for (k = 0; k < width; k++)
 801                zVals16[k] = (GLushort) (depth[k] * depthScale);
 802             zVals = zVals16;
 803             zBytes = 2;
 804          }
 805          else {
 806             GLint k;
 807             for (k = 0; k < width; k++)
 808                zVals32[k] = (GLuint) (depth[k] * depthScale);
 809             zVals = zVals32;
 810             zBytes = 4;
 811          }
 812
 813          /* Write values */
 814          if (zoom) {
 815             _swrast_write_zoomed_z_span(ctx, destX, destY, width,
 816                                         destX, dy, zVals);
 817          }
 818          else {
 819             _swrast_put_row(ctx, depthDrawRb, width, destX, dy, zVals, zBytes);
 820          }
 821       }
 822    }
 823
 824    if (tempStencilImage)
 825       _mesa_free(tempStencilImage);
 826
 827    if (tempDepthImage)
 828       _mesa_free(tempDepthImage);
 829 }
 830
 831
 832
 833 /**
 834  * Try to do a fast copy pixels.
 835  */
 836 static GLboolean
 837 fast_copy_pixels(GLcontext *ctx,
 838                  GLint srcX, GLint srcY, GLsizei width, GLsizei height,
 839                  GLint dstX, GLint dstY, GLenum type)
 840 {
 841    struct gl_framebuffer *srcFb = ctx->ReadBuffer;
 842    struct gl_framebuffer *dstFb = ctx->DrawBuffer;
 843    struct gl_renderbuffer *srcRb, *dstRb;
 844    GLint row, yStep;
 845
 846    if (SWRAST_CONTEXT(ctx)->_RasterMask != 0x0 ||
 847        ctx->Pixel.ZoomX != 1.0F ||
 848        ctx->Pixel.ZoomY != 1.0F ||
 849        ctx->_ImageTransferState) {
 850       /* can't handle these */
 851       return GL_FALSE;
 852    }
 853
 854    if (type == GL_COLOR) {
 855       if (dstFb->_NumColorDrawBuffers[0] != 1)
 856          return GL_FALSE;
 857       srcRb = srcFb->_ColorReadBuffer;
 858       dstRb = dstFb->_ColorDrawBuffers[0][0];
 859    }
 860    else if (type == GL_STENCIL) {
 861       srcRb = srcFb->_StencilBuffer;
 862       dstRb = dstFb->_StencilBuffer;
 863    }
 864    else if (type == GL_DEPTH) {
 865       srcRb = srcFb->_DepthBuffer;
 866       dstRb = dstFb->_DepthBuffer;
 867    }
 868    else if (type == GL_DEPTH_STENCIL_EXT) {
 869       /* XXX correct? */
 870       srcRb = srcFb->Attachment[BUFFER_DEPTH].Renderbuffer;
 871       dstRb = dstFb->Attachment[BUFFER_DEPTH].Renderbuffer;
 872    }
 873
 874    /* src and dst renderbuffers must be same format and type */
 875    if (!srcRb || !dstRb ||
 876        srcRb->DataType != dstRb->DataType ||
 877        srcRb->_BaseFormat != dstRb->_BaseFormat) {
 878       return GL_FALSE;
 879    }
 880
 881    /* clipping not supported */
 882    if (srcX < 0 || srcX + width > srcFb->Width ||
 883        srcY < 0 || srcY + height > srcFb->Width ||
 884        dstX < dstFb->_Xmin || dstX + width > dstFb->_Xmax ||
 885        dstY < dstFb->_Ymin || dstY + height > dstFb->_Ymax) {
 886       return GL_FALSE;
 887    }
 888
 889    /* overlapping src/dst doesn't matter, just determine Y direction */
 890    if (srcY < dstY) {
 891       /* top-down  max-to-min */
 892       srcY = srcY + height - 1;
 893       dstY = dstY + height - 1;
 894       yStep = -1;
 895    }
 896    else {
 897       /* bottom-up  min-to-max */
 898       yStep = 1;
 899    }
 900
 901    for (row = 0; row < height; row++) {
 902       GLuint temp[MAX_WIDTH][4];
 903       srcRb->GetRow(ctx, srcRb, width, srcX, srcY, temp);
 904       dstRb->PutRow(ctx, dstRb, width, dstX, dstY, temp, NULL);
 905       srcY += yStep;
 906       dstY += yStep;
 907    }
 908
 909    return GL_TRUE;
 910 }
 911
 912
 913 /**
 914  * Do software-based glCopyPixels.
 915  * By time we get here, all parameters will have been error-checked.
 916  */
 917 void
 918 _swrast_CopyPixels( GLcontext *ctx,
 919                     GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 920                     GLint destx, GLint desty, GLenum type )
 921 {
 922    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 923    RENDER_START(swrast,ctx);
 924
 925    if (swrast->NewState)
 926       _swrast_validate_derived( ctx );
 927
 928    if (!fast_copy_pixels(ctx, srcx, srcy, width, height, destx, desty, type)) {
 929       switch (type) {
 930       case GL_COLOR:
 931          if (ctx->Visual.rgbMode) {
 932             copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
 933          }
 934          else {
 935             copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
 936          }
 937          break;
 938       case GL_DEPTH:
 939          copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
 940          break;
 941       case GL_STENCIL:
 942          copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
 943          break;
 944       case GL_DEPTH_STENCIL_EXT:
 945          copy_depth_stencil_pixels(ctx, srcx, srcy, width, height, destx, desty);
 946          break;
 947       default:
 948          _mesa_problem(ctx, "unexpected type in _swrast_CopyPixels");
 949       }
 950    }
 951
 952    RENDER_FINISH(swrast,ctx);
 953 }