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, GLuint samplerIndex)
 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 = samplerIndex;
 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 = (1 << samplerIndex);
 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 static int
 162 find_free_bit(uint bitfield)
 163 {
 164    int i;
 165    for (i = 0; i < 32; i++) {
 166       if ((bitfield & (1 << i)) == 0) {
 167          return i;
 168       }
 169    }
 170    return -1;
 171 }
 172
 173
 174 /**
 175  * Combine basic bitmap fragment program with the user-defined program.
 176  */
 177 static struct st_fragment_program *
 178 combined_bitmap_fragment_program(GLcontext *ctx)
 179 {
 180    struct st_context *st = ctx->st;
 181    struct st_fragment_program *stfp = st->fp;
 182
 183    if (!stfp->bitmap_program) {
 184       /*
 185        * Generate new program which is the user-defined program prefixed
 186        * with the bitmap sampler/kill instructions.
 187        */
 188       struct st_fragment_program *bitmap_prog;
 189       uint sampler;
 190
 191       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 192       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 193
 194       stfp->bitmap_program = (struct st_fragment_program *)
 195          _mesa_combine_programs(ctx,
 196                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 197       stfp->bitmap_program->bitmap_sampler = sampler;
 198 #if 0
 199       {
 200          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 201          printf("Combined bitmap program:\n");
 202          _mesa_print_program(p);
 203          printf("InputsRead: 0x%x\n", p->InputsRead);
 204          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 205          _mesa_print_parameter_list(p->Parameters);
 206       }
 207 #endif
 208
 209       /* translate to TGSI tokens */
 210       st_translate_fragment_program(st, stfp->bitmap_program, NULL);
 211    }
 212
 213    /* Ideally we'd have updated the pipe constants during the normal
 214     * st/atom mechanism.  But we can't since this is specific to glBitmap.
 215     */
 216    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 217
 218    return stfp->bitmap_program;
 219 }
 220
 221
 222 /**
 223  * Create a texture which represents a bitmap image.
 224  */
 225 static struct pipe_texture *
 226 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 227                     const struct gl_pixelstore_attrib *unpack,
 228                     const GLubyte *bitmap)
 229 {
 230    struct pipe_context *pipe = ctx->st->pipe;
 231    struct pipe_screen *screen = pipe->screen;
 232    struct pipe_surface *surface;
 233    ubyte *dest;
 234    struct pipe_texture *pt;
 235    int row, col;
 236
 237    /* PBO source... */
 238    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 239    if (!bitmap) {
 240       return NULL;
 241    }
 242
 243    /**
 244     * Create texture to hold bitmap pattern.
 245     */
 246    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 247                           0, width, height, 1, 0);
 248    if (!pt) {
 249       _mesa_unmap_bitmap_pbo(ctx, unpack);
 250       return NULL;
 251    }
 252
 253    surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 254
 255    /* map texture surface */
 256    dest = pipe_surface_map(surface);
 257
 258    /* Put image into texture surface.
 259     * Note that the image is actually going to be upside down in
 260     * the texture.  We deal with that with texcoords.
 261     */
 262
 263    for (row = 0; row < height; row++) {
 264       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 265                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 266       ubyte *destRow = dest + row * surface->pitch;
 267
 268       if (unpack->LsbFirst) {
 269          /* Lsb first */
 270          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 271          for (col = 0; col < width; col++) {
 272
 273             /* set texel to 255 if bit is set */
 274             destRow[col] = (*src & mask) ? 0x0 : 0xff;
 275
 276             if (mask == 128U) {
 277                src++;
 278                mask = 1U;
 279             }
 280             else {
 281                mask = mask << 1;
 282             }
 283          }
 284
 285          /* get ready for next row */
 286          if (mask != 1)
 287             src++;
 288       }
 289       else {
 290          /* Msb first */
 291          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 292          for (col = 0; col < width; col++) {
 293
 294             /* set texel to 255 if bit is set */
 295             destRow[col] =(*src & mask) ? 0x0 : 0xff;
 296
 297             if (mask == 1U) {
 298                src++;
 299                mask = 128U;
 300             }
 301             else {
 302                mask = mask >> 1;
 303             }
 304          }
 305
 306          /* get ready for next row */
 307          if (mask != 128)
 308             src++;
 309       }
 310
 311    } /* row */
 312
 313    _mesa_unmap_bitmap_pbo(ctx, unpack);
 314
 315    /* Release surface */
 316    pipe_surface_unmap(surface);
 317    pipe_surface_reference(&surface, NULL);
 318    pipe->texture_update(pipe, pt, 0, 0x1);
 319
 320    return pt;
 321 }
 322
 323
 324 static void
 325 setup_bitmap_vertex_data(struct st_context *st,
 326                          int x, int y, int width, int height,
 327                          float z, const float color[4])
 328 {
 329    struct pipe_context *pipe = st->pipe;
 330    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 331    const GLfloat fb_width = fb->Width;
 332    const GLfloat fb_height = fb->Height;
 333    const GLfloat x0 = x;
 334    const GLfloat x1 = x + width;
 335    const GLfloat y0 = y;
 336    const GLfloat y1 = y + height;
 337    const GLfloat sLeft = 0.0F, sRight = 1.0F;
 338    const GLfloat tTop = 0.0, tBot = 1.0 - tTop;
 339    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 340    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 341    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 342    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 343    GLuint i;
 344    void *buf;
 345
 346    if (!st->bitmap.vbuf) {
 347       st->bitmap.vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
 348                                                    PIPE_BUFFER_USAGE_VERTEX,
 349                                                    sizeof(st->bitmap.vertices));
 350    }
 351
 352    /* Positions are in clip coords since we need to do clipping in case
 353     * the bitmap quad goes beyond the window bounds.
 354     */
 355    st->bitmap.vertices[0][0][0] = clip_x0;
 356    st->bitmap.vertices[0][0][1] = clip_y0;
 357    st->bitmap.vertices[0][2][0] = sLeft;
 358    st->bitmap.vertices[0][2][1] = tTop;
 359
 360    st->bitmap.vertices[1][0][0] = clip_x1;
 361    st->bitmap.vertices[1][0][1] = clip_y0;
 362    st->bitmap.vertices[1][2][0] = sRight;
 363    st->bitmap.vertices[1][2][1] = tTop;
 364
 365    st->bitmap.vertices[2][0][0] = clip_x1;
 366    st->bitmap.vertices[2][0][1] = clip_y1;
 367    st->bitmap.vertices[2][2][0] = sRight;
 368    st->bitmap.vertices[2][2][1] = tBot;
 369
 370    st->bitmap.vertices[3][0][0] = clip_x0;
 371    st->bitmap.vertices[3][0][1] = clip_y1;
 372    st->bitmap.vertices[3][2][0] = sLeft;
 373    st->bitmap.vertices[3][2][1] = tBot;
 374
 375    /* same for all verts: */
 376    for (i = 0; i < 4; i++) {
 377       st->bitmap.vertices[i][0][2] = z;
 378       st->bitmap.vertices[i][0][3] = 1.0;
 379       st->bitmap.vertices[i][1][0] = color[0];
 380       st->bitmap.vertices[i][1][1] = color[1];
 381       st->bitmap.vertices[i][1][2] = color[2];
 382       st->bitmap.vertices[i][1][3] = color[3];
 383       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 384       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 385    }
 386
 387    /* put vertex data into vbuf */
 388    buf = pipe->winsys->buffer_map(pipe->winsys, st->bitmap.vbuf,
 389                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 390    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 391    pipe->winsys->buffer_unmap(pipe->winsys, st->bitmap.vbuf);
 392 }
 393
 394
 395
 396 /**
 397  * Render a glBitmap by drawing a textured quad
 398  */
 399 static void
 400 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 401                  GLsizei width, GLsizei height,
 402                  struct pipe_texture *pt)
 403 {
 404    struct st_context *st = ctx->st;
 405    struct pipe_context *pipe = ctx->st->pipe;
 406    struct cso_context *cso = ctx->st->cso_context;
 407    struct st_fragment_program *stfp;
 408    GLuint maxSize;
 409
 410    stfp = combined_bitmap_fragment_program(ctx);
 411
 412    /* limit checks */
 413    /* XXX if the bitmap is larger than the max texture size, break
 414     * it up into chunks.
 415     */
 416    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 417    assert(width <= maxSize);
 418    assert(height <= maxSize);
 419
 420    cso_save_rasterizer(cso);
 421    cso_save_samplers(cso);
 422    cso_save_sampler_textures(cso);
 423    cso_save_viewport(cso);
 424    cso_save_fragment_shader(cso);
 425    cso_save_vertex_shader(cso);
 426
 427    /* rasterizer state: just scissor */
 428    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 429    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 430
 431    /* fragment shader state: TEX lookup program */
 432    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 433
 434    /* vertex shader state: position + texcoord pass-through */
 435    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 436
 437    /* user samplers, plus our bitmap sampler */
 438    {
 439       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 440       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 441       uint i;
 442       for (i = 0; i < st->state.num_samplers; i++) {
 443          samplers[i] = &st->state.samplers[i];
 444       }
 445       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 446       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);   }
 447
 448    /* user textures, plus the bitmap texture */
 449    {
 450       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 451       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 452       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 453       textures[stfp->bitmap_sampler] = pt;
 454       cso_set_sampler_textures(cso, num, textures);
 455    }
 456
 457    /* viewport state: viewport matching window dims */
 458    {
 459       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 460       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 461       const float width = fb->Width;
 462       const float height = fb->Height;
 463       struct pipe_viewport_state vp;
 464       vp.scale[0] =  0.5 * width;
 465       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 466       vp.scale[2] = 1.0;
 467       vp.scale[3] = 1.0;
 468       vp.translate[0] = 0.5 * width;
 469       vp.translate[1] = 0.5 * height;
 470       vp.translate[2] = 0.0;
 471       vp.translate[3] = 0.0;
 472       cso_set_viewport(cso, &vp);
 473    }
 474
 475    /* draw textured quad */
 476    setup_bitmap_vertex_data(st, x, y, width, height,
 477                             ctx->Current.RasterPos[2],
 478                             ctx->Current.RasterColor);
 479
 480    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 481                            PIPE_PRIM_TRIANGLE_FAN,
 482                            4,  /* verts */
 483                            3); /* attribs/vert */
 484
 485
 486    /* restore state */
 487    cso_restore_rasterizer(cso);
 488    cso_restore_samplers(cso);
 489    cso_restore_sampler_textures(cso);
 490    cso_restore_viewport(cso);
 491    cso_restore_fragment_shader(cso);
 492    cso_restore_vertex_shader(cso);
 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    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 513    if (!st->bitmap.cache)
 514       return;
 515
 516    st->bitmap.cache->texture
 517       = st_texture_create(st, PIPE_TEXTURE_2D, st->bitmap.tex_format, 0,
 518                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 1, 0);
 519    if (!st->bitmap.cache->texture) {
 520       FREE(st->bitmap.cache);
 521       st->bitmap.cache = NULL;
 522       return;
 523    }
 524
 525    reset_cache(st);
 526 }
 527
 528
 529 /**
 530  * If there's anything in the bitmap cache, draw/flush it now.
 531  */
 532 void
 533 st_flush_bitmap_cache(struct st_context *st)
 534 {
 535    if (!st->bitmap.cache->empty) {
 536       if (st->ctx->DrawBuffer) {
 537          struct bitmap_cache *cache = st->bitmap.cache;
 538          struct pipe_context *pipe = st->pipe;
 539          struct pipe_screen *screen = pipe->screen;
 540          struct pipe_surface *surf;
 541          void *dest;
 542
 543          assert(cache->xmin <= cache->xmax);
 544          /*
 545          printf("flush size %d x %d  at %d, %d\n",
 546                 cache->xmax - cache->xmin,
 547                 cache->ymax - cache->ymin,
 548                 cache->xpos, cache->ypos);
 549          */
 550
 551          /* update the texture map image */
 552          surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0);
 553          dest = pipe_surface_map(surf);
 554          memcpy(dest, cache->buffer, sizeof(cache->buffer));
 555          pipe_surface_unmap(surf);
 556          pipe_surface_reference(&surf, NULL);
 557
 558          /* flush in case the previous texture contents haven't been
 559           * used yet. XXX this is not ideal!  Revisit.
 560           */
 561          st->pipe->flush( st->pipe, 0x0, NULL );
 562
 563          pipe->texture_update(pipe, cache->texture, 0, 0x1);
 564
 565          draw_bitmap_quad(st->ctx,
 566                           cache->xpos,
 567                           cache->ypos,
 568                           st->ctx->Current.RasterPos[2],
 569                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 570                           cache->texture);
 571       }
 572       reset_cache(st);
 573    }
 574 }
 575
 576
 577 /**
 578  * Try to accumulate this glBitmap call in the bitmap cache.
 579  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 580  */
 581 static GLboolean
 582 accum_bitmap(struct st_context *st,
 583              GLint x, GLint y, GLsizei width, GLsizei height,
 584              const struct gl_pixelstore_attrib *unpack,
 585              const GLubyte *bitmap )
 586 {
 587    struct bitmap_cache *cache = st->bitmap.cache;
 588    int row, col;
 589    int px = -999, py;
 590
 591    if (width > BITMAP_CACHE_WIDTH ||
 592        height > BITMAP_CACHE_HEIGHT)
 593       return GL_FALSE; /* too big to cache */
 594
 595    if (!cache->empty) {
 596       px = x - cache->xpos;  /* pos in buffer */
 597       py = y - cache->ypos;
 598       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 599           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 600          /* This bitmap would extend beyond cache bounds,
 601           * so flush and continue.
 602           */
 603          st_flush_bitmap_cache(st);
 604       }
 605    }
 606
 607    if (cache->empty) {
 608       /* Initialize.  Center bitmap vertically in the buffer. */
 609       px = 0;
 610       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 611       cache->xpos = x;
 612       cache->ypos = y - py;
 613       cache->empty = GL_FALSE;
 614    }
 615
 616    assert(px != -999);
 617
 618    if (x < cache->xmin)
 619       cache->xmin = x;
 620    if (y < cache->ymin)
 621       cache->ymin = y;
 622    if (x + width > cache->xmax)
 623       cache->xmax = x + width;
 624    if (y + height > cache->ymax)
 625       cache->ymax = y + height;
 626
 627    /* XXX try to combine this code with code in make_bitmap_texture() */
 628 #define SET_PIXEL(COL, ROW) \
 629    cache->buffer[py + (ROW)][px + (COL)] = 0x0;
 630
 631    for (row = 0; row < height; row++) {
 632       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 633                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 634
 635       if (unpack->LsbFirst) {
 636          /* Lsb first */
 637          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 638          for (col = 0; col < width; col++) {
 639
 640             if (*src & mask) {
 641                SET_PIXEL(col, row);
 642             }
 643
 644             if (mask == 128U) {
 645                src++;
 646                mask = 1U;
 647             }
 648             else {
 649                mask = mask << 1;
 650             }
 651          }
 652
 653          /* get ready for next row */
 654          if (mask != 1)
 655             src++;
 656       }
 657       else {
 658          /* Msb first */
 659          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 660          for (col = 0; col < width; col++) {
 661
 662             if (*src & mask) {
 663                SET_PIXEL(col, row);
 664             }
 665
 666             if (mask == 1U) {
 667                src++;
 668                mask = 128U;
 669             }
 670             else {
 671                mask = mask >> 1;
 672             }
 673          }
 674
 675          /* get ready for next row */
 676          if (mask != 128)
 677             src++;
 678       }
 679
 680    } /* row */
 681
 682    return GL_TRUE; /* accumulated */
 683 }
 684
 685
 686
 687 /**
 688  * Called via ctx->Driver.Bitmap()
 689  */
 690 static void
 691 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 692           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 693 {
 694    struct st_context *st = ctx->st;
 695    struct pipe_texture *pt;
 696
 697    st_validate_state(st);
 698
 699    if (!st->bitmap.vs) {
 700       /* create pass-through vertex shader now */
 701       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 702                                       TGSI_SEMANTIC_COLOR,
 703                                       TGSI_SEMANTIC_GENERIC };
 704       const uint semantic_indexes[] = { 0, 0, 0 };
 705       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 706                                                           semantic_names,
 707                                                           semantic_indexes,
 708                                                           &st->bitmap.vert_shader);
 709    }
 710
 711    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 712       return;
 713
 714    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 715    if (pt) {
 716       assert(pt->target == PIPE_TEXTURE_2D);
 717       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 718                        width, height, pt);
 719       pipe_texture_reference(&pt, NULL);
 720    }
 721 }
 722
 723
 724 /** Per-context init */
 725 void
 726 st_init_bitmap_functions(struct dd_function_table *functions)
 727 {
 728    functions->Bitmap = st_Bitmap;
 729 }
 730
 731
 732 /** Per-context init */
 733 void
 734 st_init_bitmap(struct st_context *st)
 735 {
 736    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 737    struct pipe_context *pipe = st->pipe;
 738    struct pipe_screen *screen = pipe->screen;
 739
 740    /* init sampler state once */
 741    memset(sampler, 0, sizeof(*sampler));
 742    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 743    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 744    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 745    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 746    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 747    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 748    sampler->normalized_coords = 1;
 749
 750    /* init baseline rasterizer state once */
 751    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 752    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 753    st->bitmap.rasterizer.bypass_vs = 1;
 754
 755    /* find a usable texture format */
 756    if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
 757       st->bitmap.tex_format = PIPE_FORMAT_U_I8;
 758    }
 759    else {
 760       /* XXX support more formats */
 761       assert(0);
 762    }
 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 0
 775    if (st->bitmap.combined_prog) {
 776       st_delete_program(st->ctx, &st->bitmap.combined_prog->Base.Base);
 777    }
 778
 779    if (st->bitmap.program) {
 780       st_delete_program(st->ctx, &st->bitmap.program->Base.Base);
 781    }
 782 #endif
 783    if (st->bitmap.vs) {
 784       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 785       st->bitmap.vs = NULL;
 786    }
 787
 788    if (st->bitmap.vbuf) {
 789       pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
 790       st->bitmap.vbuf = NULL;
 791    }
 792
 793    if (st->bitmap.cache) {
 794       pipe_texture_release(&st->bitmap.cache->texture);
 795       FREE(st->bitmap.cache);
 796       st->bitmap.cache = NULL;
 797    }
 798 }