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    uint format = 0, cpp, comp;
 234    ubyte *dest;
 235    struct pipe_texture *pt;
 236    int row, col;
 237
 238    /* find a texture format we know */
 239    if (screen->is_format_supported( screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE )) {
 240       format = PIPE_FORMAT_U_I8;
 241       cpp = 1;
 242       comp = 0;
 243    }
 244    else if (screen->is_format_supported( screen, PIPE_FORMAT_A8R8G8B8_UNORM, PIPE_TEXTURE )) {
 245       format = PIPE_FORMAT_A8R8G8B8_UNORM;
 246       cpp = 4;
 247       comp = 3; /* alpha channel */ /*XXX little-endian dependency */
 248    }
 249    else {
 250       /* XXX support more formats */
 251       assert( 0 );
 252    }
 253
 254    /* PBO source... */
 255    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 256    if (!bitmap) {
 257       return NULL;
 258    }
 259
 260    /**
 261     * Create texture to hold bitmap pattern.
 262     */
 263    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, format, 0, width, height,
 264                           1, 0);
 265    if (!pt) {
 266       _mesa_unmap_bitmap_pbo(ctx, unpack);
 267       return NULL;
 268    }
 269
 270    surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 271
 272    /* map texture surface */
 273    dest = pipe_surface_map(surface);
 274
 275    /* Put image into texture surface.
 276     * Note that the image is actually going to be upside down in
 277     * the texture.  We deal with that with texcoords.
 278     */
 279
 280    for (row = 0; row < height; row++) {
 281       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 282                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 283       ubyte *destRow = dest + row * surface->pitch * cpp;
 284
 285       if (unpack->LsbFirst) {
 286          /* Lsb first */
 287          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 288          for (col = 0; col < width; col++) {
 289
 290             /* set texel to 255 if bit is set */
 291             destRow[comp] = (*src & mask) ? 0x0 : 0xff;
 292             destRow += cpp;
 293
 294             if (mask == 128U) {
 295                src++;
 296                mask = 1U;
 297             }
 298             else {
 299                mask = mask << 1;
 300             }
 301          }
 302
 303          /* get ready for next row */
 304          if (mask != 1)
 305             src++;
 306       }
 307       else {
 308          /* Msb first */
 309          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 310          for (col = 0; col < width; col++) {
 311
 312             /* set texel to 255 if bit is set */
 313             destRow[comp] =(*src & mask) ? 0x0 : 0xff;
 314             destRow += cpp;
 315
 316             if (mask == 1U) {
 317                src++;
 318                mask = 128U;
 319             }
 320             else {
 321                mask = mask >> 1;
 322             }
 323          }
 324
 325          /* get ready for next row */
 326          if (mask != 128)
 327             src++;
 328       }
 329
 330    } /* row */
 331
 332    _mesa_unmap_bitmap_pbo(ctx, unpack);
 333
 334    /* Release surface */
 335    pipe_surface_unmap(surface);
 336    pipe_surface_reference(&surface, NULL);
 337    pipe->texture_update(pipe, pt, 0, 0x1);
 338
 339    pt->format = format;
 340
 341    return pt;
 342 }
 343
 344
 345 static void
 346 setup_bitmap_vertex_data(struct st_context *st,
 347                          int x, int y, int width, int height,
 348                          float z, const float color[4])
 349 {
 350    struct pipe_context *pipe = st->pipe;
 351    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 352    const GLfloat fb_width = fb->Width;
 353    const GLfloat fb_height = fb->Height;
 354    const GLfloat x0 = x;
 355    const GLfloat x1 = x + width;
 356    const GLfloat y0 = y;
 357    const GLfloat y1 = y + height;
 358    const GLfloat sLeft = 0.0F, sRight = 1.0F;
 359    const GLfloat tTop = 0.0, tBot = 1.0 - tTop;
 360    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 361    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 362    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 363    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 364    GLuint i;
 365    void *buf;
 366
 367    if (!st->bitmap.vbuf) {
 368       st->bitmap.vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
 369                                                    PIPE_BUFFER_USAGE_VERTEX,
 370                                                    sizeof(st->bitmap.vertices));
 371    }
 372
 373    /* Positions are in clip coords since we need to do clipping in case
 374     * the bitmap quad goes beyond the window bounds.
 375     */
 376    st->bitmap.vertices[0][0][0] = clip_x0;
 377    st->bitmap.vertices[0][0][1] = clip_y0;
 378    st->bitmap.vertices[0][2][0] = sLeft;
 379    st->bitmap.vertices[0][2][1] = tTop;
 380
 381    st->bitmap.vertices[1][0][0] = clip_x1;
 382    st->bitmap.vertices[1][0][1] = clip_y0;
 383    st->bitmap.vertices[1][2][0] = sRight;
 384    st->bitmap.vertices[1][2][1] = tTop;
 385
 386    st->bitmap.vertices[2][0][0] = clip_x1;
 387    st->bitmap.vertices[2][0][1] = clip_y1;
 388    st->bitmap.vertices[2][2][0] = sRight;
 389    st->bitmap.vertices[2][2][1] = tBot;
 390
 391    st->bitmap.vertices[3][0][0] = clip_x0;
 392    st->bitmap.vertices[3][0][1] = clip_y1;
 393    st->bitmap.vertices[3][2][0] = sLeft;
 394    st->bitmap.vertices[3][2][1] = tBot;
 395
 396    /* same for all verts: */
 397    for (i = 0; i < 4; i++) {
 398       st->bitmap.vertices[i][0][2] = z;
 399       st->bitmap.vertices[i][0][3] = 1.0;
 400       st->bitmap.vertices[i][1][0] = color[0];
 401       st->bitmap.vertices[i][1][1] = color[1];
 402       st->bitmap.vertices[i][1][2] = color[2];
 403       st->bitmap.vertices[i][1][3] = color[3];
 404       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 405       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 406    }
 407
 408    /* put vertex data into vbuf */
 409    buf = pipe->winsys->buffer_map(pipe->winsys, st->bitmap.vbuf,
 410                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 411    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 412    pipe->winsys->buffer_unmap(pipe->winsys, st->bitmap.vbuf);
 413 }
 414
 415
 416
 417 /**
 418  * Render a glBitmap by drawing a textured quad
 419  */
 420 static void
 421 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 422                  GLsizei width, GLsizei height,
 423                  struct pipe_texture *pt)
 424 {
 425    struct st_context *st = ctx->st;
 426    struct pipe_context *pipe = ctx->st->pipe;
 427    struct cso_context *cso = ctx->st->cso_context;
 428    struct st_fragment_program *stfp;
 429    GLuint maxSize;
 430
 431    stfp = combined_bitmap_fragment_program(ctx);
 432
 433    /* limit checks */
 434    /* XXX if the bitmap is larger than the max texture size, break
 435     * it up into chunks.
 436     */
 437    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 438    assert(width <= maxSize);
 439    assert(height <= maxSize);
 440
 441    cso_save_rasterizer(cso);
 442    cso_save_samplers(cso);
 443    cso_save_sampler_textures(cso);
 444    cso_save_viewport(cso);
 445    cso_save_fragment_shader(cso);
 446    cso_save_vertex_shader(cso);
 447
 448    /* rasterizer state: just scissor */
 449    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 450    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 451
 452    /* fragment shader state: TEX lookup program */
 453    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 454
 455    /* vertex shader state: position + texcoord pass-through */
 456    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 457
 458    /* user samplers, plus our bitmap sampler */
 459    {
 460       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 461       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 462       uint i;
 463       for (i = 0; i < st->state.num_samplers; i++) {
 464          samplers[i] = &st->state.samplers[i];
 465       }
 466       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 467       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);   }
 468
 469    /* user textures, plus the bitmap texture */
 470    {
 471       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 472       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 473       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 474       textures[stfp->bitmap_sampler] = pt;
 475       cso_set_sampler_textures(cso, num, textures);
 476    }
 477
 478    /* viewport state: viewport matching window dims */
 479    {
 480       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 481       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 482       const float width = fb->Width;
 483       const float height = fb->Height;
 484       struct pipe_viewport_state vp;
 485       vp.scale[0] =  0.5 * width;
 486       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 487       vp.scale[2] = 1.0;
 488       vp.scale[3] = 1.0;
 489       vp.translate[0] = 0.5 * width;
 490       vp.translate[1] = 0.5 * height;
 491       vp.translate[2] = 0.0;
 492       vp.translate[3] = 0.0;
 493       cso_set_viewport(cso, &vp);
 494    }
 495
 496    /* draw textured quad */
 497    setup_bitmap_vertex_data(st, x, y, width, height,
 498                             ctx->Current.RasterPos[2],
 499                             ctx->Current.RasterColor);
 500
 501    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 502                            PIPE_PRIM_TRIANGLE_FAN,
 503                            4,  /* verts */
 504                            3); /* attribs/vert */
 505
 506
 507    /* restore state */
 508    cso_restore_rasterizer(cso);
 509    cso_restore_samplers(cso);
 510    cso_restore_sampler_textures(cso);
 511    cso_restore_viewport(cso);
 512    cso_restore_fragment_shader(cso);
 513    cso_restore_vertex_shader(cso);
 514 }
 515
 516
 517 static void
 518 reset_cache(struct st_context *st)
 519 {
 520    memset(st->bitmap.cache->buffer, 0xff, sizeof(st->bitmap.cache->buffer));
 521    st->bitmap.cache->empty = GL_TRUE;
 522
 523    st->bitmap.cache->xmin = 1000000;
 524    st->bitmap.cache->xmax = -1000000;
 525    st->bitmap.cache->ymin = 1000000;
 526    st->bitmap.cache->ymax = -1000000;
 527 }
 528
 529
 530 static void
 531 init_bitmap_cache(struct st_context *st)
 532 {
 533    struct pipe_context *pipe = st->pipe;
 534    struct pipe_screen *screen = pipe->screen;
 535    enum pipe_format format;
 536
 537    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 538    if (!st->bitmap.cache)
 539       return;
 540
 541    /* find a usable texture format */
 542    if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
 543       format = PIPE_FORMAT_U_I8;
 544    }
 545    else {
 546       /* XXX support more formats */
 547       assert(0);
 548    }
 549
 550    st->bitmap.cache->texture
 551       = st_texture_create(st, PIPE_TEXTURE_2D, format, 0,
 552                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 1, 0);
 553    if (!st->bitmap.cache->texture) {
 554       FREE(st->bitmap.cache);
 555       st->bitmap.cache = NULL;
 556       return;
 557    }
 558
 559    reset_cache(st);
 560 }
 561
 562
 563 /**
 564  * If there's anything in the bitmap cache, draw/flush it now.
 565  */
 566 void
 567 st_flush_bitmap_cache(struct st_context *st)
 568 {
 569    if (!st->bitmap.cache->empty) {
 570       if (st->ctx->DrawBuffer) {
 571          struct bitmap_cache *cache = st->bitmap.cache;
 572          struct pipe_context *pipe = st->pipe;
 573          struct pipe_screen *screen = pipe->screen;
 574          struct pipe_surface *surf;
 575          void *dest;
 576
 577          assert(cache->xmin <= cache->xmax);
 578          /*
 579          printf("flush size %d x %d  at %d, %d\n",
 580                 cache->xmax - cache->xmin,
 581                 cache->ymax - cache->ymin,
 582                 cache->xpos, cache->ypos);
 583          */
 584
 585          /* update the texture map image */
 586          surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0);
 587          dest = pipe_surface_map(surf);
 588          memcpy(dest, cache->buffer, sizeof(cache->buffer));
 589          pipe_surface_unmap(surf);
 590          pipe_surface_reference(&surf, NULL);
 591
 592          /* flush in case the previous texture contents haven't been
 593           * used yet. XXX this is not ideal!  Revisit.
 594           */
 595          st->pipe->flush( st->pipe, 0x0, NULL );
 596
 597          pipe->texture_update(pipe, cache->texture, 0, 0x1);
 598
 599          draw_bitmap_quad(st->ctx,
 600                           cache->xpos,
 601                           cache->ypos,
 602                           st->ctx->Current.RasterPos[2],
 603                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 604                           cache->texture);
 605       }
 606       reset_cache(st);
 607    }
 608 }
 609
 610
 611 /**
 612  * Try to accumulate this glBitmap call in the bitmap cache.
 613  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 614  */
 615 static GLboolean
 616 accum_bitmap(struct st_context *st,
 617              GLint x, GLint y, GLsizei width, GLsizei height,
 618              const struct gl_pixelstore_attrib *unpack,
 619              const GLubyte *bitmap )
 620 {
 621    struct bitmap_cache *cache = st->bitmap.cache;
 622    int row, col;
 623    int px = -999, py;
 624
 625    if (width > BITMAP_CACHE_WIDTH ||
 626        height > BITMAP_CACHE_HEIGHT)
 627       return GL_FALSE; /* too big to cache */
 628
 629    if (!cache->empty) {
 630       px = x - cache->xpos;  /* pos in buffer */
 631       py = y - cache->ypos;
 632       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 633           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 634          /* This bitmap would extend beyond cache bounds,
 635           * so flush and continue.
 636           */
 637          st_flush_bitmap_cache(st);
 638       }
 639    }
 640
 641    if (cache->empty) {
 642       /* Initialize.  Center bitmap vertically in the buffer. */
 643       px = 0;
 644       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 645       cache->xpos = x;
 646       cache->ypos = y - py;
 647       cache->empty = GL_FALSE;
 648    }
 649
 650    assert(px != -999);
 651
 652    if (x < cache->xmin)
 653       cache->xmin = x;
 654    if (y < cache->ymin)
 655       cache->ymin = y;
 656    if (x + width > cache->xmax)
 657       cache->xmax = x + width;
 658    if (y + height > cache->ymax)
 659       cache->ymax = y + height;
 660
 661    /* XXX try to combine this code with code in make_bitmap_texture() */
 662 #define SET_PIXEL(COL, ROW) \
 663    cache->buffer[py + (ROW)][px + (COL)] = 0x0;
 664
 665    for (row = 0; row < height; row++) {
 666       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 667                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 668
 669       if (unpack->LsbFirst) {
 670          /* Lsb first */
 671          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 672          for (col = 0; col < width; col++) {
 673
 674             if (*src & mask) {
 675                SET_PIXEL(col, row);
 676             }
 677
 678             if (mask == 128U) {
 679                src++;
 680                mask = 1U;
 681             }
 682             else {
 683                mask = mask << 1;
 684             }
 685          }
 686
 687          /* get ready for next row */
 688          if (mask != 1)
 689             src++;
 690       }
 691       else {
 692          /* Msb first */
 693          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 694          for (col = 0; col < width; col++) {
 695
 696             if (*src & mask) {
 697                SET_PIXEL(col, row);
 698             }
 699
 700             if (mask == 1U) {
 701                src++;
 702                mask = 128U;
 703             }
 704             else {
 705                mask = mask >> 1;
 706             }
 707          }
 708
 709          /* get ready for next row */
 710          if (mask != 128)
 711             src++;
 712       }
 713
 714    } /* row */
 715
 716    return GL_TRUE; /* accumulated */
 717 }
 718
 719
 720
 721 /**
 722  * Called via ctx->Driver.Bitmap()
 723  */
 724 static void
 725 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 726           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 727 {
 728    struct st_context *st = ctx->st;
 729    struct pipe_texture *pt;
 730
 731    st_validate_state(st);
 732
 733    if (!st->bitmap.vs) {
 734       /* create pass-through vertex shader now */
 735       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 736                                       TGSI_SEMANTIC_COLOR,
 737                                       TGSI_SEMANTIC_GENERIC };
 738       const uint semantic_indexes[] = { 0, 0, 0 };
 739       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 740                                                           semantic_names,
 741                                                           semantic_indexes,
 742                                                           &st->bitmap.vert_shader);
 743    }
 744
 745    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 746       return;
 747
 748    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 749    if (pt) {
 750       assert(pt->target == PIPE_TEXTURE_2D);
 751       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 752                        width, height, pt);
 753       pipe_texture_reference(&pt, NULL);
 754    }
 755 }
 756
 757
 758 /** Per-context init */
 759 void
 760 st_init_bitmap_functions(struct dd_function_table *functions)
 761 {
 762    functions->Bitmap = st_Bitmap;
 763 }
 764
 765
 766 /** Per-context init */
 767 void
 768 st_init_bitmap(struct st_context *st)
 769 {
 770    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 771
 772    /* init sampler state once */
 773    memset(sampler, 0, sizeof(*sampler));
 774    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 775    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 776    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 777    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 778    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 779    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 780    sampler->normalized_coords = 1;
 781
 782    /* init baseline rasterizer state once */
 783    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 784    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 785    st->bitmap.rasterizer.bypass_vs = 1;
 786
 787    init_bitmap_cache(st);
 788 }
 789
 790
 791 /** Per-context tear-down */
 792 void
 793 st_destroy_bitmap(struct st_context *st)
 794 {
 795    struct pipe_context *pipe = st->pipe;
 796
 797 #if 0
 798    if (st->bitmap.combined_prog) {
 799       st_delete_program(st->ctx, &st->bitmap.combined_prog->Base.Base);
 800    }
 801
 802    if (st->bitmap.program) {
 803       st_delete_program(st->ctx, &st->bitmap.program->Base.Base);
 804    }
 805 #endif
 806    if (st->bitmap.vs) {
 807       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 808       st->bitmap.vs = NULL;
 809    }
 810
 811    if (st->bitmap.vbuf) {
 812       pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
 813       st->bitmap.vbuf = NULL;
 814    }
 815
 816    if (st->bitmap.cache) {
 817       pipe_texture_release(&st->bitmap.cache->texture);
 818       FREE(st->bitmap.cache);
 819       st->bitmap.cache = NULL;
 820    }
 821 }