src/mesa/state_tracker/st_cb_bitmap.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   * Authors:
  30   *   Brian Paul
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/bufferobj.h"
  36 #include "main/macros.h"
  37 #include "main/texformat.h"
  38 #include "shader/program.h"
  39 #include "shader/prog_parameter.h"
  40 #include "shader/prog_print.h"
  41
  42 #include "st_context.h"
  43 #include "st_atom.h"
  44 #include "st_atom_constbuf.h"
  45 #include "st_program.h"
  46 #include "st_cb_bitmap.h"
  47 #include "st_cb_program.h"
  48 #include "st_mesa_to_tgsi.h"
  49 #include "st_texture.h"
  50 #include "pipe/p_context.h"
  51 #include "pipe/p_defines.h"
  52 #include "pipe/p_inlines.h"
  53 #include "pipe/p_winsys.h"
  54 #include "util/p_tile.h"
  55 #include "util/u_draw_quad.h"
  56 #include "util/u_simple_shaders.h"
  57 #include "shader/prog_instruction.h"
  58 #include "cso_cache/cso_context.h"
  59
  60
  61
  62 /**
  63  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  64  * is stored in a texture image.  An alpha8 texture format is used.
  65  * The fragment shader samples a bit (texel) from the texture, then
  66  * discards the fragment if the bit is off.
  67  *
  68  * Note that we actually store the inverse image of the bitmap to
  69  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  70  * and an "off" bit is stored as texel=0xff.  Then we kill the
  71  * fragment if the negated texel value is less than zero.
  72  */
  73
  74
  75 /**
  76  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  77  * buffer which is then rendered en mass upon a flush, state change, etc.
  78  * A wide, short buffer is used to target the common case of a series
  79  * of glBitmap calls being used to draw text.
  80  */
  81 static GLboolean UseBitmapCache = GL_TRUE;
  82
  83
  84 #define BITMAP_CACHE_WIDTH  512
  85 #define BITMAP_CACHE_HEIGHT 32
  86
  87 struct bitmap_cache
  88 {
  89    /** Window pos to render the cached image */
  90    GLint xpos, ypos;
  91    /** Bounds of region used in window coords */
  92    GLint xmin, ymin, xmax, ymax;
  93    struct pipe_texture *texture;
  94    GLboolean empty;
  95    /** An I8 texture image: */
  96    GLubyte buffer[BITMAP_CACHE_HEIGHT][BITMAP_CACHE_WIDTH];
  97 };
  98
  99
 100
 101
 102 /**
 103  * Make fragment program for glBitmap:
 104  *   Sample the texture and kill the fragment if the bit is 0.
 105  * This program will be combined with the user's fragment program.
 106  */
 107 static struct st_fragment_program *
 108 make_bitmap_fragment_program(GLcontext *ctx)
 109 {
 110    struct st_fragment_program *stfp;
 111    struct gl_program *p;
 112    GLuint ic = 0;
 113
 114    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 115    if (!p)
 116       return NULL;
 117
 118    p->NumInstructions = 3;
 119
 120    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 121    if (!p->Instructions) {
 122       ctx->Driver.DeleteProgram(ctx, p);
 123       return NULL;
 124    }
 125    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 126
 127    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 128    p->Instructions[ic].Opcode = OPCODE_TEX;
 129    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 130    p->Instructions[ic].DstReg.Index = 0;
 131    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 132    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 133    p->Instructions[ic].TexSrcUnit = 0;
 134    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 135    ic++;
 136
 137    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 138    p->Instructions[ic].Opcode = OPCODE_KIL;
 139    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 140    p->Instructions[ic].SrcReg[0].Index = 0;
 141    p->Instructions[ic].SrcReg[0].NegateBase = NEGATE_XYZW;
 142    ic++;
 143
 144    /* END; */
 145    p->Instructions[ic++].Opcode = OPCODE_END;
 146
 147    assert(ic == p->NumInstructions);
 148
 149    p->InputsRead = FRAG_BIT_TEX0;
 150    p->OutputsWritten = 0x0;
 151    p->SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
 152
 153    stfp = (struct st_fragment_program *) p;
 154    stfp->Base.UsesKill = GL_TRUE;
 155    st_translate_fragment_program(ctx->st, stfp, NULL);
 156
 157    return stfp;
 158 }
 159
 160
 161 /**
 162  * Combine basic bitmap fragment program with the user-defined program.
 163  */
 164 static struct st_fragment_program *
 165 combined_bitmap_fragment_program(GLcontext *ctx)
 166 {
 167    struct st_context *st = ctx->st;
 168    struct st_fragment_program *stfp;
 169
 170    if (!st->bitmap.program) {
 171       /* create the basic bitmap fragment program */
 172       st->bitmap.program = make_bitmap_fragment_program(ctx);
 173    }
 174
 175    if (st->bitmap.user_prog_sn == st->fp->serialNo) {
 176       /* re-use */
 177       stfp = st->bitmap.combined_prog;
 178    }
 179    else {
 180       /* Concatenate the bitmap program with the current user-defined program.
 181        */
 182       stfp = (struct st_fragment_program *)
 183          _mesa_combine_programs(ctx,
 184                                 &st->bitmap.program->Base.Base,
 185                                 &st->fp->Base.Base);
 186
 187 #if 0
 188       {
 189          struct gl_program *p = &stfp->Base.Base;
 190          printf("Combined bitmap program:\n");
 191          _mesa_print_program(p);
 192          printf("InputsRead: 0x%x\n", p->InputsRead);
 193          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 194          _mesa_print_parameter_list(p->Parameters);
 195       }
 196 #endif
 197
 198       /* translate to TGSI tokens */
 199       st_translate_fragment_program(st, stfp, NULL);
 200
 201       /* save new program, update serial numbers */
 202       st->bitmap.user_prog_sn = st->fp->serialNo;
 203       st->bitmap.combined_prog = stfp;
 204    }
 205
 206    /* Ideally we'd have updated the pipe constants during the normal
 207     * st/atom mechanism.  But we can't since this is specific to glBitmap.
 208     */
 209    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 210
 211    return stfp;
 212 }
 213
 214
 215 /**
 216  * Create a texture which represents a bitmap image.
 217  */
 218 static struct pipe_texture *
 219 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 220                     const struct gl_pixelstore_attrib *unpack,
 221                     const GLubyte *bitmap)
 222 {
 223    struct pipe_context *pipe = ctx->st->pipe;
 224    struct pipe_screen *screen = pipe->screen;
 225    struct pipe_surface *surface;
 226    uint format = 0, cpp, comp;
 227    ubyte *dest;
 228    struct pipe_texture *pt;
 229    int row, col;
 230
 231    /* find a texture format we know */
 232    if (screen->is_format_supported( screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE )) {
 233       format = PIPE_FORMAT_U_I8;
 234       cpp = 1;
 235       comp = 0;
 236    }
 237    else if (screen->is_format_supported( screen, PIPE_FORMAT_A8R8G8B8_UNORM, PIPE_TEXTURE )) {
 238       format = PIPE_FORMAT_A8R8G8B8_UNORM;
 239       cpp = 4;
 240       comp = 3; /* alpha channel */ /*XXX little-endian dependency */
 241    }
 242    else {
 243       /* XXX support more formats */
 244       assert( 0 );
 245    }
 246
 247    /* PBO source... */
 248    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 249    if (!bitmap) {
 250       return NULL;
 251    }
 252
 253    /**
 254     * Create texture to hold bitmap pattern.
 255     */
 256    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, format, 0, width, height,
 257                           1, 0);
 258    if (!pt) {
 259       _mesa_unmap_bitmap_pbo(ctx, unpack);
 260       return NULL;
 261    }
 262
 263    surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 264
 265    /* map texture surface */
 266    dest = pipe_surface_map(surface);
 267
 268    /* Put image into texture surface.
 269     * Note that the image is actually going to be upside down in
 270     * the texture.  We deal with that with texcoords.
 271     */
 272
 273    for (row = 0; row < height; row++) {
 274       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 275                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 276       ubyte *destRow = dest + row * surface->pitch * cpp;
 277
 278       if (unpack->LsbFirst) {
 279          /* Lsb first */
 280          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 281          for (col = 0; col < width; col++) {
 282
 283             /* set texel to 255 if bit is set */
 284             destRow[comp] = (*src & mask) ? 0x0 : 0xff;
 285             destRow += cpp;
 286
 287             if (mask == 128U) {
 288                src++;
 289                mask = 1U;
 290             }
 291             else {
 292                mask = mask << 1;
 293             }
 294          }
 295
 296          /* get ready for next row */
 297          if (mask != 1)
 298             src++;
 299       }
 300       else {
 301          /* Msb first */
 302          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 303          for (col = 0; col < width; col++) {
 304
 305             /* set texel to 255 if bit is set */
 306             destRow[comp] =(*src & mask) ? 0x0 : 0xff;
 307             destRow += cpp;
 308
 309             if (mask == 1U) {
 310                src++;
 311                mask = 128U;
 312             }
 313             else {
 314                mask = mask >> 1;
 315             }
 316          }
 317
 318          /* get ready for next row */
 319          if (mask != 128)
 320             src++;
 321       }
 322
 323    } /* row */
 324
 325    _mesa_unmap_bitmap_pbo(ctx, unpack);
 326
 327    /* Release surface */
 328    pipe_surface_unmap(surface);
 329    pipe_surface_reference(&surface, NULL);
 330    pipe->texture_update(pipe, pt, 0, 0x1);
 331
 332    pt->format = format;
 333
 334    return pt;
 335 }
 336
 337
 338 static void
 339 setup_bitmap_vertex_data(struct st_context *st,
 340                          int x, int y, int width, int height,
 341                          float z, const float color[4])
 342 {
 343    struct pipe_context *pipe = st->pipe;
 344    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 345    const GLfloat fb_width = fb->Width;
 346    const GLfloat fb_height = fb->Height;
 347    const GLfloat x0 = x;
 348    const GLfloat x1 = x + width;
 349    const GLfloat y0 = y;
 350    const GLfloat y1 = y + height;
 351    const GLfloat bias = st->bitmap_texcoord_bias;
 352    const GLfloat xBias = bias / (x1-x0);
 353    const GLfloat yBias = bias / (y1-y0);
 354    const GLfloat sLeft = 0.0 + xBias, sRight = 1.0 + xBias;
 355    const GLfloat tTop = yBias, tBot = 1.0 - tTop - yBias;
 356    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 357    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 358    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 359    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 360    GLuint i;
 361    void *buf;
 362
 363    if (!st->bitmap.vbuf) {
 364       st->bitmap.vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
 365                                                    PIPE_BUFFER_USAGE_VERTEX,
 366                                                    sizeof(st->bitmap.vertices));
 367    }
 368
 369    /* Positions are in clip coords since we need to do clipping in case
 370     * the bitmap quad goes beyond the window bounds.
 371     */
 372    st->bitmap.vertices[0][0][0] = clip_x0;
 373    st->bitmap.vertices[0][0][1] = clip_y0;
 374    st->bitmap.vertices[0][2][0] = sLeft;
 375    st->bitmap.vertices[0][2][1] = tTop;
 376
 377    st->bitmap.vertices[1][0][0] = clip_x1;
 378    st->bitmap.vertices[1][0][1] = clip_y0;
 379    st->bitmap.vertices[1][2][0] = sRight;
 380    st->bitmap.vertices[1][2][1] = tTop;
 381
 382    st->bitmap.vertices[2][0][0] = clip_x1;
 383    st->bitmap.vertices[2][0][1] = clip_y1;
 384    st->bitmap.vertices[2][2][0] = sRight;
 385    st->bitmap.vertices[2][2][1] = tBot;
 386
 387    st->bitmap.vertices[3][0][0] = clip_x0;
 388    st->bitmap.vertices[3][0][1] = clip_y1;
 389    st->bitmap.vertices[3][2][0] = sLeft;
 390    st->bitmap.vertices[3][2][1] = tBot;
 391
 392    /* same for all verts: */
 393    for (i = 0; i < 4; i++) {
 394       st->bitmap.vertices[i][0][2] = z;
 395       st->bitmap.vertices[i][0][3] = 1.0;
 396       st->bitmap.vertices[i][1][0] = color[0];
 397       st->bitmap.vertices[i][1][1] = color[1];
 398       st->bitmap.vertices[i][1][2] = color[2];
 399       st->bitmap.vertices[i][1][3] = color[3];
 400       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 401       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 402    }
 403
 404    /* put vertex data into vbuf */
 405    buf = pipe->winsys->buffer_map(pipe->winsys, st->bitmap.vbuf,
 406                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 407    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 408    pipe->winsys->buffer_unmap(pipe->winsys, st->bitmap.vbuf);
 409 }
 410
 411
 412
 413 /**
 414  * Render a glBitmap by drawing a textured quad
 415  */
 416 static void
 417 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 418                  GLsizei width, GLsizei height,
 419                  struct pipe_texture *pt)
 420 {
 421    struct st_context *st = ctx->st;
 422    struct pipe_context *pipe = ctx->st->pipe;
 423    struct cso_context *cso = ctx->st->cso_context;
 424    struct st_fragment_program *stfp;
 425    GLuint maxSize;
 426
 427    stfp = combined_bitmap_fragment_program(ctx);
 428
 429    /* limit checks */
 430    /* XXX if the bitmap is larger than the max texture size, break
 431     * it up into chunks.
 432     */
 433    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 434    assert(width <= maxSize);
 435    assert(height <= maxSize);
 436
 437    cso_save_rasterizer(cso);
 438    cso_save_samplers(cso);
 439    cso_save_sampler_textures(cso);
 440    cso_save_viewport(cso);
 441    cso_save_fragment_shader(cso);
 442    cso_save_vertex_shader(cso);
 443
 444    /* rasterizer state: just scissor */
 445    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 446    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 447
 448    /* fragment shader state: TEX lookup program */
 449    cso_set_fragment_shader(cso, stfp->driver_shader);
 450
 451    /* vertex shader state: position + texcoord pass-through */
 452    cso_set_vertex_shader(cso, st->bitmap.vs);
 453
 454    /* sampler / texture state */
 455    cso_single_sampler(cso, 0, &st->bitmap.sampler);
 456    cso_single_sampler_done(cso);
 457    pipe->set_sampler_textures(pipe, 1, &pt);
 458
 459    /* viewport state: viewport matching window dims */
 460    {
 461       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 462       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 463       const float width = fb->Width;
 464       const float height = fb->Height;
 465       struct pipe_viewport_state vp;
 466       vp.scale[0] =  0.5 * width;
 467       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 468       vp.scale[2] = 1.0;
 469       vp.scale[3] = 1.0;
 470       vp.translate[0] = 0.5 * width;
 471       vp.translate[1] = 0.5 * height;
 472       vp.translate[2] = 0.0;
 473       vp.translate[3] = 0.0;
 474       cso_set_viewport(cso, &vp);
 475    }
 476
 477    /* draw textured quad */
 478    setup_bitmap_vertex_data(st, x, y, width, height,
 479                             ctx->Current.RasterPos[2],
 480                             ctx->Current.RasterColor);
 481
 482    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 483                            PIPE_PRIM_TRIANGLE_FAN,
 484                            4,  /* verts */
 485                            3); /* attribs/vert */
 486
 487
 488    /* restore state */
 489    cso_restore_rasterizer(cso);
 490    cso_restore_samplers(cso);
 491    cso_restore_sampler_textures(cso);
 492    cso_restore_viewport(cso);
 493    cso_save_fragment_shader(cso);
 494    cso_save_vertex_shader(cso);
 495 }
 496
 497
 498 static void
 499 reset_cache(struct st_context *st)
 500 {
 501    memset(st->bitmap.cache->buffer, 0xff, sizeof(st->bitmap.cache->buffer));
 502    st->bitmap.cache->empty = GL_TRUE;
 503
 504    st->bitmap.cache->xmin = 1000000;
 505    st->bitmap.cache->xmax = -1000000;
 506    st->bitmap.cache->ymin = 1000000;
 507    st->bitmap.cache->ymax = -1000000;
 508 }
 509
 510
 511 static void
 512 init_bitmap_cache(struct st_context *st)
 513 {
 514    struct pipe_context *pipe = st->pipe;
 515    struct pipe_screen *screen = pipe->screen;
 516    enum pipe_format format;
 517
 518    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 519    if (!st->bitmap.cache)
 520       return;
 521
 522    /* find a usable texture format */
 523    if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
 524       format = PIPE_FORMAT_U_I8;
 525    }
 526    else {
 527       /* XXX support more formats */
 528       assert(0);
 529    }
 530
 531    st->bitmap.cache->texture
 532       = st_texture_create(st, PIPE_TEXTURE_2D, format, 0,
 533                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 1, 0);
 534    if (!st->bitmap.cache->texture) {
 535       FREE(st->bitmap.cache);
 536       st->bitmap.cache = NULL;
 537       return;
 538    }
 539
 540    reset_cache(st);
 541 }
 542
 543
 544 /**
 545  * If there's anything in the bitmap cache, draw/flush it now.
 546  */
 547 void
 548 st_flush_bitmap_cache(struct st_context *st)
 549 {
 550    if (!st->bitmap.cache->empty) {
 551       if (st->ctx->DrawBuffer) {
 552          struct bitmap_cache *cache = st->bitmap.cache;
 553          struct pipe_context *pipe = st->pipe;
 554          struct pipe_screen *screen = pipe->screen;
 555          struct pipe_surface *surf;
 556          void *dest;
 557
 558          assert(cache->xmin <= cache->xmax);
 559          /*
 560          printf("flush size %d x %d  at %d, %d\n",
 561                 cache->xmax - cache->xmin,
 562                 cache->ymax - cache->ymin,
 563                 cache->xpos, cache->ypos);
 564          */
 565
 566          /* update the texture map image */
 567          surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0);
 568          dest = pipe_surface_map(surf);
 569          memcpy(dest, cache->buffer, sizeof(cache->buffer));
 570          pipe_surface_unmap(surf);
 571          pipe_surface_reference(&surf, NULL);
 572
 573          pipe->texture_update(pipe, cache->texture, 0, 0x1);
 574
 575          draw_bitmap_quad(st->ctx,
 576                           cache->xpos,
 577                           cache->ypos,
 578                           st->ctx->Current.RasterPos[2],
 579                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 580                           cache->texture);
 581
 582       }
 583       reset_cache(st);
 584    }
 585 }
 586
 587
 588 /**
 589  * Try to accumulate this glBitmap call in the bitmap cache.
 590  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 591  */
 592 static GLboolean
 593 accum_bitmap(struct st_context *st,
 594              GLint x, GLint y, GLsizei width, GLsizei height,
 595              const struct gl_pixelstore_attrib *unpack,
 596              const GLubyte *bitmap )
 597 {
 598    struct bitmap_cache *cache = st->bitmap.cache;
 599    int row, col;
 600    int px = -999, py;
 601
 602    if (width > BITMAP_CACHE_WIDTH ||
 603        height > BITMAP_CACHE_HEIGHT)
 604       return GL_FALSE; /* too big to cache */
 605
 606    if (!cache->empty) {
 607       px = x - cache->xpos;  /* pos in buffer */
 608       py = y - cache->ypos;
 609       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 610           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 611          /* This bitmap would extend beyond cache bounds,
 612           * so flush and continue.
 613           */
 614          st_flush_bitmap_cache(st);
 615       }
 616    }
 617
 618    if (cache->empty) {
 619       /* Initialize.  Center bitmap vertically in the buffer. */
 620       px = 0;
 621       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 622       cache->xpos = x;
 623       cache->ypos = y - py;
 624       cache->empty = GL_FALSE;
 625    }
 626
 627    assert(px != -999);
 628
 629    if (x < cache->xmin)
 630       cache->xmin = x;
 631    if (y < cache->ymin)
 632       cache->ymin = y;
 633    if (x + width > cache->xmax)
 634       cache->xmax = x + width;
 635    if (y + height > cache->ymax)
 636       cache->ymax = y + height;
 637
 638    /* XXX try to combine this code with code in make_bitmap_texture() */
 639 #define SET_PIXEL(COL, ROW) \
 640    cache->buffer[py + (ROW)][px + (COL)] = 0x0;
 641
 642    for (row = 0; row < height; row++) {
 643       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 644                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 645
 646       if (unpack->LsbFirst) {
 647          /* Lsb first */
 648          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 649          for (col = 0; col < width; col++) {
 650
 651             if (*src & mask) {
 652                SET_PIXEL(col, row);
 653             }
 654
 655             if (mask == 128U) {
 656                src++;
 657                mask = 1U;
 658             }
 659             else {
 660                mask = mask << 1;
 661             }
 662          }
 663
 664          /* get ready for next row */
 665          if (mask != 1)
 666             src++;
 667       }
 668       else {
 669          /* Msb first */
 670          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 671          for (col = 0; col < width; col++) {
 672
 673             if (*src & mask) {
 674                SET_PIXEL(col, row);
 675             }
 676
 677             if (mask == 1U) {
 678                src++;
 679                mask = 128U;
 680             }
 681             else {
 682                mask = mask >> 1;
 683             }
 684          }
 685
 686          /* get ready for next row */
 687          if (mask != 128)
 688             src++;
 689       }
 690
 691    } /* row */
 692
 693    return GL_TRUE; /* accumulated */
 694 }
 695
 696
 697
 698 /**
 699  * Called via ctx->Driver.Bitmap()
 700  */
 701 static void
 702 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 703           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 704 {
 705    struct st_context *st = ctx->st;
 706    struct pipe_texture *pt;
 707
 708    st_validate_state(st);
 709
 710    if (!st->bitmap.vs) {
 711       /* create pass-through vertex shader now */
 712       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 713                                       TGSI_SEMANTIC_COLOR,
 714                                       TGSI_SEMANTIC_GENERIC };
 715       const uint semantic_indexes[] = { 0, 0, 0 };
 716       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 717                                                           semantic_names,
 718                                                           semantic_indexes,
 719                                                           &st->bitmap.vert_shader);
 720    }
 721
 722    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 723       return;
 724
 725    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 726    if (pt) {
 727       assert(pt->target == PIPE_TEXTURE_2D);
 728       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 729                        width, height, pt);
 730       pipe_texture_reference(&pt, NULL);
 731    }
 732 }
 733
 734
 735 /** Per-context init */
 736 void
 737 st_init_bitmap_functions(struct dd_function_table *functions)
 738 {
 739    functions->Bitmap = st_Bitmap;
 740 }
 741
 742
 743 /** Per-context init */
 744 void
 745 st_init_bitmap(struct st_context *st)
 746 {
 747    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 748
 749    /* init sampler state once */
 750    memset(sampler, 0, sizeof(*sampler));
 751    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 752    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 753    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 754    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 755    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 756    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 757    sampler->normalized_coords = 1;
 758
 759    /* init baseline rasterizer state once */
 760    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 761    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 762    st->bitmap.rasterizer.bypass_vs = 1;
 763
 764    init_bitmap_cache(st);
 765 }
 766
 767
 768 /** Per-context tear-down */
 769 void
 770 st_destroy_bitmap(struct st_context *st)
 771 {
 772    struct pipe_context *pipe = st->pipe;
 773
 774    if (st->bitmap.combined_prog) {
 775       st_delete_program(st->ctx, &st->bitmap.combined_prog->Base.Base);
 776    }
 777
 778    if (st->bitmap.program) {
 779       st_delete_program(st->ctx, &st->bitmap.program->Base.Base);
 780    }
 781
 782    if (st->bitmap.vs) {
 783       pipe->delete_vs_state(pipe, st->bitmap.vs);
 784       st->bitmap.vs = NULL;
 785    }
 786
 787    if (st->bitmap.vbuf) {
 788       pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
 789       st->bitmap.vbuf = NULL;
 790    }
 791
 792    if (st->bitmap.cache) {
 793       pipe_texture_release(&st->bitmap.cache->texture);
 794       FREE(st->bitmap.cache);
 795       st->bitmap.cache = NULL;
 796    }
 797 }