src/mesa/state_tracker/st_cb_readpixels.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 /**
  30  * glReadPixels interface to pipe
  31  *
  32  * \author Brian Paul
  33  */
  34
  35
  36 #include "main/imports.h"
  37 #include "main/bufferobj.h"
  38 #include "main/context.h"
  39 #include "main/image.h"
  40
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43 #include "util/u_inlines.h"
  44 #include "util/u_tile.h"
  45
  46 #include "st_debug.h"
  47 #include "st_context.h"
  48 #include "st_atom.h"
  49 #include "st_cb_bitmap.h"
  50 #include "st_cb_readpixels.h"
  51 #include "st_cb_fbo.h"
  52
  53 /**
  54  * Special case for reading stencil buffer.
  55  * For color/depth we use get_tile().  For stencil, map the stencil buffer.
  56  */
  57 void
  58 st_read_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
  59                        GLsizei width, GLsizei height,
  60                        GLenum format, GLenum type,
  61                        const struct gl_pixelstore_attrib *packing,
  62                        GLvoid *pixels)
  63 {
  64    struct gl_framebuffer *fb = ctx->ReadBuffer;
  65    struct pipe_context *pipe = st_context(ctx)->pipe;
  66    struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);
  67    struct pipe_transfer *pt;
  68    ubyte *stmap;
  69    GLint j;
  70
  71    if (strb->Base.Wrapped) {
  72       strb = st_renderbuffer(strb->Base.Wrapped);
  73    }
  74
  75    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
  76       y = ctx->DrawBuffer->Height - y - height;
  77    }
  78
  79    /* Create a read transfer from the renderbuffer's texture */
  80
  81    pt = pipe_get_transfer(pipe, strb->texture,
  82                           0, 0, 0,  /* face, level, zslice */
  83                           PIPE_TRANSFER_READ,
  84                           x, y, width, height);
  85
  86    /* map the stencil buffer */
  87    stmap = pipe_transfer_map(pipe, pt);
  88
  89    /* width should never be > MAX_WIDTH since we did clipping earlier */
  90    ASSERT(width <= MAX_WIDTH);
  91
  92    /* process image row by row */
  93    for (j = 0; j < height; j++) {
  94       GLvoid *dest;
  95       GLstencil sValues[MAX_WIDTH];
  96       GLfloat zValues[MAX_WIDTH];
  97       GLint srcY;
  98
  99       if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 100          srcY = height - j - 1;
 101       }
 102       else {
 103          srcY = j;
 104       }
 105
 106       /* get stencil (and Z) values */
 107       switch (pt->resource->format) {
 108       case PIPE_FORMAT_S8_USCALED:
 109          {
 110             const ubyte *src = stmap + srcY * pt->stride;
 111             memcpy(sValues, src, width);
 112          }
 113          break;
 114       case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 115          if (format == GL_DEPTH_STENCIL) {
 116             const uint *src = (uint *) (stmap + srcY * pt->stride);
 117             const GLfloat scale = 1.0f / (0xffffff);
 118             GLint k;
 119             for (k = 0; k < width; k++) {
 120                sValues[k] = src[k] >> 24;
 121                zValues[k] = (src[k] & 0xffffff) * scale;
 122             }
 123          }
 124          else {
 125             const uint *src = (uint *) (stmap + srcY * pt->stride);
 126             GLint k;
 127             for (k = 0; k < width; k++) {
 128                sValues[k] = src[k] >> 24;
 129             }
 130          }
 131          break;
 132       case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 133          if (format == GL_DEPTH_STENCIL) {
 134             const uint *src = (uint *) (stmap + srcY * pt->stride);
 135             const GLfloat scale = 1.0f / (0xffffff);
 136             GLint k;
 137             for (k = 0; k < width; k++) {
 138                sValues[k] = src[k] & 0xff;
 139                zValues[k] = (src[k] >> 8) * scale;
 140             }
 141          }
 142          else {
 143             const uint *src = (uint *) (stmap + srcY * pt->stride);
 144             GLint k;
 145             for (k = 0; k < width; k++) {
 146                sValues[k] = src[k] & 0xff;
 147             }
 148          }
 149          break;
 150       default:
 151          assert(0);
 152       }
 153
 154       /* store */
 155       dest = _mesa_image_address2d(packing, pixels, width, height,
 156                                    format, type, j, 0);
 157       if (format == GL_DEPTH_STENCIL) {
 158          _mesa_pack_depth_stencil_span(ctx, width, dest,
 159                                        zValues, sValues, packing);
 160       }
 161       else {
 162          _mesa_pack_stencil_span(ctx, width, type, dest, sValues, packing);
 163       }
 164    }
 165
 166    /* unmap the stencil buffer */
 167    pipe_transfer_unmap(pipe, pt);
 168    pipe->transfer_destroy(pipe, pt);
 169 }
 170
 171
 172 /**
 173  * Return renderbuffer to use for reading color pixels for glRead/CopyPixel
 174  * commands.
 175  */
 176 struct st_renderbuffer *
 177 st_get_color_read_renderbuffer(GLcontext *ctx)
 178 {
 179    struct gl_framebuffer *fb = ctx->ReadBuffer;
 180    struct st_renderbuffer *strb =
 181       st_renderbuffer(fb->_ColorReadBuffer);
 182
 183    return strb;
 184 }
 185
 186
 187 /**
 188  * Try to do glReadPixels in a fast manner for common cases.
 189  * \return GL_TRUE for success, GL_FALSE for failure
 190  */
 191 static GLboolean
 192 st_fast_readpixels(GLcontext *ctx, struct st_renderbuffer *strb,
 193                    GLint x, GLint y, GLsizei width, GLsizei height,
 194                    GLenum format, GLenum type,
 195                    const struct gl_pixelstore_attrib *pack,
 196                    GLvoid *dest)
 197 {
 198    enum combination {
 199       A8R8G8B8_UNORM_TO_RGBA_UBYTE,
 200       A8R8G8B8_UNORM_TO_RGB_UBYTE,
 201       A8R8G8B8_UNORM_TO_BGRA_UINT
 202    } combo;
 203
 204    if (ctx->_ImageTransferState)
 205       return GL_FALSE;
 206
 207    if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
 208        format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
 209       combo = A8R8G8B8_UNORM_TO_RGBA_UBYTE;
 210    }
 211    else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
 212             format == GL_RGB && type == GL_UNSIGNED_BYTE) {
 213       combo = A8R8G8B8_UNORM_TO_RGB_UBYTE;
 214    }
 215    else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
 216             format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV) {
 217       combo = A8R8G8B8_UNORM_TO_BGRA_UINT;
 218    }
 219    else {
 220       return GL_FALSE;
 221    }
 222
 223    /*printf("st_fast_readpixels combo %d\n", (GLint) combo);*/
 224
 225    {
 226       struct pipe_context *pipe = st_context(ctx)->pipe;
 227       struct pipe_transfer *trans;
 228       const GLubyte *map;
 229       GLubyte *dst;
 230       GLint row, col, dy, dstStride;
 231
 232       if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
 233          /* convert GL Y to Gallium Y */
 234          y = strb->texture->height0 - y - height;
 235       }
 236
 237       trans = pipe_get_transfer(pipe, strb->texture,
 238                                 0, 0, 0,  /* face, level, zslice */
 239                                 PIPE_TRANSFER_READ,
 240                                 x, y, width, height);
 241       if (!trans) {
 242          return GL_FALSE;
 243       }
 244
 245       map = pipe_transfer_map(pipe, trans);
 246       if (!map) {
 247          pipe->transfer_destroy(pipe, trans);
 248          return GL_FALSE;
 249       }
 250
 251       /* We always write to the user/dest buffer from low addr to high addr
 252        * but the read order depends on renderbuffer orientation
 253        */
 254       if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
 255          /* read source rows from bottom to top */
 256          y = height - 1;
 257          dy = -1;
 258       }
 259       else {
 260          /* read source rows from top to bottom */
 261          y = 0;
 262          dy = 1;
 263       }
 264
 265       dst = _mesa_image_address2d(pack, dest, width, height,
 266                                   format, type, 0, 0);
 267       dstStride = _mesa_image_row_stride(pack, width, format, type);
 268
 269       switch (combo) {
 270       case A8R8G8B8_UNORM_TO_RGBA_UBYTE:
 271          for (row = 0; row < height; row++) {
 272             const GLubyte *src = map + y * trans->stride;
 273             for (col = 0; col < width; col++) {
 274                GLuint pixel = ((GLuint *) src)[col];
 275                dst[col*4+0] = (pixel >> 16) & 0xff;
 276                dst[col*4+1] = (pixel >>  8) & 0xff;
 277                dst[col*4+2] = (pixel >>  0) & 0xff;
 278                dst[col*4+3] = (pixel >> 24) & 0xff;
 279             }
 280             dst += dstStride;
 281             y += dy;
 282          }
 283          break;
 284       case A8R8G8B8_UNORM_TO_RGB_UBYTE:
 285          for (row = 0; row < height; row++) {
 286             const GLubyte *src = map + y * trans->stride;
 287             for (col = 0; col < width; col++) {
 288                GLuint pixel = ((GLuint *) src)[col];
 289                dst[col*3+0] = (pixel >> 16) & 0xff;
 290                dst[col*3+1] = (pixel >>  8) & 0xff;
 291                dst[col*3+2] = (pixel >>  0) & 0xff;
 292             }
 293             dst += dstStride;
 294             y += dy;
 295          }
 296          break;
 297       case A8R8G8B8_UNORM_TO_BGRA_UINT:
 298          for (row = 0; row < height; row++) {
 299             const GLubyte *src = map + y * trans->stride;
 300             memcpy(dst, src, 4 * width);
 301             dst += dstStride;
 302             y += dy;
 303          }
 304          break;
 305       default:
 306          ; /* nothing */
 307       }
 308
 309       pipe_transfer_unmap(pipe, trans);
 310       pipe->transfer_destroy(pipe, trans);
 311    }
 312
 313    return GL_TRUE;
 314 }
 315
 316
 317 /**
 318  * Do glReadPixels by getting rows from the framebuffer transfer with
 319  * get_tile().  Convert to requested format/type with Mesa image routines.
 320  * Image transfer ops are done in software too.
 321  */
 322 static void
 323 st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 324               GLenum format, GLenum type,
 325               const struct gl_pixelstore_attrib *pack,
 326               GLvoid *dest)
 327 {
 328    struct st_context *st = st_context(ctx);
 329    struct pipe_context *pipe = st->pipe;
 330    GLfloat temp[MAX_WIDTH][4];
 331    const GLbitfield transferOps = ctx->_ImageTransferState;
 332    GLsizei i, j;
 333    GLint yStep, dfStride;
 334    GLfloat *df;
 335    struct st_renderbuffer *strb;
 336    struct gl_pixelstore_attrib clippedPacking = *pack;
 337    struct pipe_transfer *trans;
 338
 339    assert(ctx->ReadBuffer->Width > 0);
 340
 341    st_validate_state(st);
 342
 343    /* Do all needed clipping here, so that we can forget about it later */
 344    if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
 345       /* The ReadPixels transfer is totally outside the window bounds */
 346       return;
 347    }
 348
 349    st_flush_bitmap_cache(st);
 350
 351    dest = _mesa_map_pbo_dest(ctx, &clippedPacking, dest);
 352    if (!dest)
 353       return;
 354
 355    if (format == GL_STENCIL_INDEX ||
 356        format == GL_DEPTH_STENCIL) {
 357       st_read_stencil_pixels(ctx, x, y, width, height,
 358                              format, type, pack, dest);
 359       return;
 360    }
 361    else if (format == GL_DEPTH_COMPONENT) {
 362       strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
 363       if (strb->Base.Wrapped) {
 364          strb = st_renderbuffer(strb->Base.Wrapped);
 365       }
 366    }
 367    else {
 368       /* Read color buffer */
 369       strb = st_get_color_read_renderbuffer(ctx);
 370    }
 371
 372    if (!strb)
 373       return;
 374
 375    /* try a fast-path readpixels before anything else */
 376    if (st_fast_readpixels(ctx, strb, x, y, width, height,
 377                           format, type, pack, dest)) {
 378       /* success! */
 379       _mesa_unmap_pbo_dest(ctx, &clippedPacking);
 380       return;
 381    }
 382
 383    if (format == GL_RGBA && type == GL_FLOAT) {
 384       /* write tile(row) directly into user's buffer */
 385       df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,
 386                                              height, format, type, 0, 0);
 387       dfStride = width * 4;
 388    }
 389    else {
 390       /* write tile(row) into temp row buffer */
 391       df = (GLfloat *) temp;
 392       dfStride = 0;
 393    }
 394
 395    if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
 396       /* convert GL Y to Gallium Y */
 397       y = strb->Base.Height - y - height;
 398    }
 399
 400    /* Create a read transfer from the renderbuffer's texture */
 401    trans = pipe_get_transfer(pipe, strb->texture,
 402                              0, 0, 0,  /* face, level, zslice */
 403                              PIPE_TRANSFER_READ,
 404                              x, y, width, height);
 405
 406    /* determine bottom-to-top vs. top-to-bottom order */
 407    if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
 408       y = height - 1;
 409       yStep = -1;
 410    }
 411    else {
 412       y = 0;
 413       yStep = 1;
 414    }
 415
 416    if (ST_DEBUG & DEBUG_FALLBACK)
 417       debug_printf("%s: fallback processing\n", __FUNCTION__);
 418
 419    /*
 420     * Copy pixels from pipe_transfer to user memory
 421     */
 422    {
 423       /* dest of first pixel in client memory */
 424       GLubyte *dst = _mesa_image_address2d(&clippedPacking, dest, width,
 425                                            height, format, type, 0, 0);
 426       /* dest row stride */
 427       const GLint dstStride = _mesa_image_row_stride(&clippedPacking, width,
 428                                                      format, type);
 429
 430       if (trans->resource->format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
 431           trans->resource->format == PIPE_FORMAT_Z24X8_UNORM) {
 432          if (format == GL_DEPTH_COMPONENT) {
 433             for (i = 0; i < height; i++) {
 434                GLuint ztemp[MAX_WIDTH];
 435                GLfloat zfloat[MAX_WIDTH];
 436                const double scale = 1.0 / ((1 << 24) - 1);
 437                pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
 438                y += yStep;
 439                for (j = 0; j < width; j++) {
 440                   zfloat[j] = (float) (scale * (ztemp[j] & 0xffffff));
 441                }
 442                _mesa_pack_depth_span(ctx, width, dst, type,
 443                                      zfloat, &clippedPacking);
 444                dst += dstStride;
 445             }
 446          }
 447          else {
 448             /* XXX: unreachable code -- should be before st_read_stencil_pixels */
 449             assert(format == GL_DEPTH_STENCIL_EXT);
 450             for (i = 0; i < height; i++) {
 451                GLuint *zshort = (GLuint *)dst;
 452                pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);
 453                y += yStep;
 454                /* Reverse into 24/8 */
 455                for (j = 0; j < width; j++) {
 456                   zshort[j] = (zshort[j] << 8) | (zshort[j] >> 24);
 457                }
 458                dst += dstStride;
 459             }
 460          }
 461       }
 462       else if (trans->resource->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
 463                trans->resource->format == PIPE_FORMAT_X8Z24_UNORM) {
 464          if (format == GL_DEPTH_COMPONENT) {
 465             for (i = 0; i < height; i++) {
 466                GLuint ztemp[MAX_WIDTH];
 467                GLfloat zfloat[MAX_WIDTH];
 468                const double scale = 1.0 / ((1 << 24) - 1);
 469                pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
 470                y += yStep;
 471                for (j = 0; j < width; j++) {
 472                   zfloat[j] = (float) (scale * ((ztemp[j] >> 8) & 0xffffff));
 473                }
 474                _mesa_pack_depth_span(ctx, width, dst, type,
 475                                      zfloat, &clippedPacking);
 476                dst += dstStride;
 477             }
 478          }
 479          else {
 480             /* XXX: unreachable code -- should be before st_read_stencil_pixels */
 481             assert(format == GL_DEPTH_STENCIL_EXT);
 482             for (i = 0; i < height; i++) {
 483                pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);
 484                y += yStep;
 485                dst += dstStride;
 486             }
 487          }
 488       }
 489       else if (trans->resource->format == PIPE_FORMAT_Z16_UNORM) {
 490          for (i = 0; i < height; i++) {
 491             GLushort ztemp[MAX_WIDTH];
 492             GLfloat zfloat[MAX_WIDTH];
 493             const double scale = 1.0 / 0xffff;
 494             pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
 495             y += yStep;
 496             for (j = 0; j < width; j++) {
 497                zfloat[j] = (float) (scale * ztemp[j]);
 498             }
 499             _mesa_pack_depth_span(ctx, width, dst, type,
 500                                   zfloat, &clippedPacking);
 501             dst += dstStride;
 502          }
 503       }
 504       else if (trans->resource->format == PIPE_FORMAT_Z32_UNORM) {
 505          for (i = 0; i < height; i++) {
 506             GLuint ztemp[MAX_WIDTH];
 507             GLfloat zfloat[MAX_WIDTH];
 508             const double scale = 1.0 / 0xffffffff;
 509             pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);
 510             y += yStep;
 511             for (j = 0; j < width; j++) {
 512                zfloat[j] = (float) (scale * ztemp[j]);
 513             }
 514             _mesa_pack_depth_span(ctx, width, dst, type,
 515                                   zfloat, &clippedPacking);
 516             dst += dstStride;
 517          }
 518       }
 519       else {
 520          /* RGBA format */
 521          /* Do a row at a time to flip image data vertically */
 522          for (i = 0; i < height; i++) {
 523             pipe_get_tile_rgba(pipe, trans, 0, y, width, 1, df);
 524             y += yStep;
 525             df += dfStride;
 526             if (!dfStride) {
 527                _mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,
 528                                           &clippedPacking, transferOps);
 529                dst += dstStride;
 530             }
 531          }
 532       }
 533    }
 534
 535    pipe->transfer_destroy(pipe, trans);
 536
 537    _mesa_unmap_pbo_dest(ctx, &clippedPacking);
 538 }
 539
 540
 541 void st_init_readpixels_functions(struct dd_function_table *functions)
 542 {
 543    functions->ReadPixels = st_readpixels;
 544 }