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