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 "util/p_tile.h"
  54 #include "util/u_draw_quad.h"
  55 #include "util/u_simple_shaders.h"
  56 #include "shader/prog_instruction.h"
  57 #include "cso_cache/cso_context.h"
  58
  59
  60
  61 /**
  62  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  63  * is stored in a texture image.  An alpha8 texture format is used.
  64  * The fragment shader samples a bit (texel) from the texture, then
  65  * discards the fragment if the bit is off.
  66  *
  67  * Note that we actually store the inverse image of the bitmap to
  68  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  69  * and an "off" bit is stored as texel=0xff.  Then we kill the
  70  * fragment if the negated texel value is less than zero.
  71  */
  72
  73
  74 /**
  75  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  76  * buffer which is then rendered en mass upon a flush, state change, etc.
  77  * A wide, short buffer is used to target the common case of a series
  78  * of glBitmap calls being used to draw text.
  79  */
  80 static GLboolean UseBitmapCache = GL_TRUE;
  81
  82
  83 #define BITMAP_CACHE_WIDTH  512
  84 #define BITMAP_CACHE_HEIGHT 32
  85
  86 struct bitmap_cache
  87 {
  88    /** Window pos to render the cached image */
  89    GLint xpos, ypos;
  90    /** Bounds of region used in window coords */
  91    GLint xmin, ymin, xmax, ymax;
  92
  93    struct pipe_texture *texture;
  94    struct pipe_surface *surf;
  95
  96    GLboolean empty;
  97
  98    /** An I8 texture image: */
  99    ubyte *buffer;
 100 };
 101
 102
 103
 104
 105 /**
 106  * Make fragment program for glBitmap:
 107  *   Sample the texture and kill the fragment if the bit is 0.
 108  * This program will be combined with the user's fragment program.
 109  */
 110 static struct st_fragment_program *
 111 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 112 {
 113    struct st_fragment_program *stfp;
 114    struct gl_program *p;
 115    GLuint ic = 0;
 116
 117    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 118    if (!p)
 119       return NULL;
 120
 121    p->NumInstructions = 3;
 122
 123    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 124    if (!p->Instructions) {
 125       ctx->Driver.DeleteProgram(ctx, p);
 126       return NULL;
 127    }
 128    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 129
 130    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 131    p->Instructions[ic].Opcode = OPCODE_TEX;
 132    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 133    p->Instructions[ic].DstReg.Index = 0;
 134    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 135    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 136    p->Instructions[ic].TexSrcUnit = samplerIndex;
 137    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 138    ic++;
 139
 140    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 141    p->Instructions[ic].Opcode = OPCODE_KIL;
 142    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 143    p->Instructions[ic].SrcReg[0].Index = 0;
 144    p->Instructions[ic].SrcReg[0].NegateBase = NEGATE_XYZW;
 145    ic++;
 146
 147    /* END; */
 148    p->Instructions[ic++].Opcode = OPCODE_END;
 149
 150    assert(ic == p->NumInstructions);
 151
 152    p->InputsRead = FRAG_BIT_TEX0;
 153    p->OutputsWritten = 0x0;
 154    p->SamplersUsed = (1 << samplerIndex);
 155
 156    stfp = (struct st_fragment_program *) p;
 157    stfp->Base.UsesKill = GL_TRUE;
 158    st_translate_fragment_program(ctx->st, stfp, NULL);
 159
 160    return stfp;
 161 }
 162
 163
 164 static int
 165 find_free_bit(uint bitfield)
 166 {
 167    int i;
 168    for (i = 0; i < 32; i++) {
 169       if ((bitfield & (1 << i)) == 0) {
 170          return i;
 171       }
 172    }
 173    return -1;
 174 }
 175
 176
 177 /**
 178  * Combine basic bitmap fragment program with the user-defined program.
 179  */
 180 static struct st_fragment_program *
 181 combined_bitmap_fragment_program(GLcontext *ctx)
 182 {
 183    struct st_context *st = ctx->st;
 184    struct st_fragment_program *stfp = st->fp;
 185
 186    if (!stfp->bitmap_program) {
 187       /*
 188        * Generate new program which is the user-defined program prefixed
 189        * with the bitmap sampler/kill instructions.
 190        */
 191       struct st_fragment_program *bitmap_prog;
 192       uint sampler;
 193
 194       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 195       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 196
 197       stfp->bitmap_program = (struct st_fragment_program *)
 198          _mesa_combine_programs(ctx,
 199                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 200       stfp->bitmap_program->bitmap_sampler = sampler;
 201
 202       /* done with this after combining */
 203       st_reference_fragprog(st, &bitmap_prog, NULL);
 204
 205 #if 0
 206       {
 207          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 208          printf("Combined bitmap program:\n");
 209          _mesa_print_program(p);
 210          printf("InputsRead: 0x%x\n", p->InputsRead);
 211          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 212          _mesa_print_parameter_list(p->Parameters);
 213       }
 214 #endif
 215
 216       /* translate to TGSI tokens */
 217       st_translate_fragment_program(st, stfp->bitmap_program, NULL);
 218    }
 219
 220    /* Ideally we'd have updated the pipe constants during the normal
 221     * st/atom mechanism.  But we can't since this is specific to glBitmap.
 222     */
 223    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 224
 225    return stfp->bitmap_program;
 226 }
 227
 228
 229 /**
 230  * Copy user-provide bitmap bits into texture buffer, expanding
 231  * bits into texels.
 232  * "On" bits will set texels to 0xff.
 233  * "Off" bits will not modify texels.
 234  * Note that the image is actually going to be upside down in
 235  * the texture.  We deal with that with texcoords.
 236  */
 237 static void
 238 unpack_bitmap(struct st_context *st,
 239               GLint px, GLint py, GLsizei width, GLsizei height,
 240               const struct gl_pixelstore_attrib *unpack,
 241               const GLubyte *bitmap,
 242               ubyte *destBuffer, uint destStride)
 243 {
 244    GLint row, col;
 245
 246 #define SET_PIXEL(COL, ROW) \
 247    destBuffer[(py + (ROW)) * destStride + px + (COL)] = 0x0;
 248
 249    for (row = 0; row < height; row++) {
 250       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 251                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 252
 253       if (unpack->LsbFirst) {
 254          /* Lsb first */
 255          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 256          for (col = 0; col < width; col++) {
 257
 258             if (*src & mask) {
 259                SET_PIXEL(col, row);
 260             }
 261
 262             if (mask == 128U) {
 263                src++;
 264                mask = 1U;
 265             }
 266             else {
 267                mask = mask << 1;
 268             }
 269          }
 270
 271          /* get ready for next row */
 272          if (mask != 1)
 273             src++;
 274       }
 275       else {
 276          /* Msb first */
 277          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 278          for (col = 0; col < width; col++) {
 279
 280             if (*src & mask) {
 281                SET_PIXEL(col, row);
 282             }
 283
 284             if (mask == 1U) {
 285                src++;
 286                mask = 128U;
 287             }
 288             else {
 289                mask = mask >> 1;
 290             }
 291          }
 292
 293          /* get ready for next row */
 294          if (mask != 128)
 295             src++;
 296       }
 297
 298    } /* row */
 299
 300 #undef SET_PIXEL
 301 }
 302
 303
 304 /**
 305  * Create a texture which represents a bitmap image.
 306  */
 307 static struct pipe_texture *
 308 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 309                     const struct gl_pixelstore_attrib *unpack,
 310                     const GLubyte *bitmap)
 311 {
 312    struct pipe_context *pipe = ctx->st->pipe;
 313    struct pipe_screen *screen = pipe->screen;
 314    struct pipe_surface *surface;
 315    ubyte *dest;
 316    struct pipe_texture *pt;
 317
 318    /* PBO source... */
 319    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 320    if (!bitmap) {
 321       return NULL;
 322    }
 323
 324    /**
 325     * Create texture to hold bitmap pattern.
 326     */
 327    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 328                           0, width, height, 1, 0,
 329                           PIPE_TEXTURE_USAGE_SAMPLER);
 330    if (!pt) {
 331       _mesa_unmap_bitmap_pbo(ctx, unpack);
 332       return NULL;
 333    }
 334
 335    surface = screen->get_tex_surface(screen, pt, 0, 0, 0,
 336                                      PIPE_BUFFER_USAGE_CPU_WRITE);
 337
 338    /* map texture surface */
 339    dest = screen->surface_map(screen, surface, PIPE_BUFFER_USAGE_CPU_WRITE);
 340
 341    /* Put image into texture surface */
 342    memset(dest, 0xff, height * surface->pitch);
 343    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 344                  dest, surface->pitch);
 345
 346    _mesa_unmap_bitmap_pbo(ctx, unpack);
 347
 348    /* Release surface */
 349    screen->surface_unmap(screen, surface);
 350    pipe_surface_reference(&surface, NULL);
 351
 352    return pt;
 353 }
 354
 355
 356 static void
 357 setup_bitmap_vertex_data(struct st_context *st,
 358                          int x, int y, int width, int height,
 359                          float z, const float color[4])
 360 {
 361    struct pipe_context *pipe = st->pipe;
 362    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 363    const GLfloat fb_width = fb->Width;
 364    const GLfloat fb_height = fb->Height;
 365    const GLfloat x0 = x;
 366    const GLfloat x1 = x + width;
 367    const GLfloat y0 = y;
 368    const GLfloat y1 = y + height;
 369    const GLfloat sLeft = 0.0F, sRight = 1.0F;
 370    const GLfloat tTop = 0.0, tBot = 1.0 - tTop;
 371    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 372    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 373    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 374    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 375    GLuint i;
 376    void *buf;
 377
 378    if (!st->bitmap.vbuf) {
 379       st->bitmap.vbuf = pipe_buffer_create(pipe, 32, PIPE_BUFFER_USAGE_VERTEX,
 380                                            sizeof(st->bitmap.vertices));
 381    }
 382
 383    /* Positions are in clip coords since we need to do clipping in case
 384     * the bitmap quad goes beyond the window bounds.
 385     */
 386    st->bitmap.vertices[0][0][0] = clip_x0;
 387    st->bitmap.vertices[0][0][1] = clip_y0;
 388    st->bitmap.vertices[0][2][0] = sLeft;
 389    st->bitmap.vertices[0][2][1] = tTop;
 390
 391    st->bitmap.vertices[1][0][0] = clip_x1;
 392    st->bitmap.vertices[1][0][1] = clip_y0;
 393    st->bitmap.vertices[1][2][0] = sRight;
 394    st->bitmap.vertices[1][2][1] = tTop;
 395
 396    st->bitmap.vertices[2][0][0] = clip_x1;
 397    st->bitmap.vertices[2][0][1] = clip_y1;
 398    st->bitmap.vertices[2][2][0] = sRight;
 399    st->bitmap.vertices[2][2][1] = tBot;
 400
 401    st->bitmap.vertices[3][0][0] = clip_x0;
 402    st->bitmap.vertices[3][0][1] = clip_y1;
 403    st->bitmap.vertices[3][2][0] = sLeft;
 404    st->bitmap.vertices[3][2][1] = tBot;
 405
 406    /* same for all verts: */
 407    for (i = 0; i < 4; i++) {
 408       st->bitmap.vertices[i][0][2] = z;
 409       st->bitmap.vertices[i][0][3] = 1.0;
 410       st->bitmap.vertices[i][1][0] = color[0];
 411       st->bitmap.vertices[i][1][1] = color[1];
 412       st->bitmap.vertices[i][1][2] = color[2];
 413       st->bitmap.vertices[i][1][3] = color[3];
 414       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 415       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 416    }
 417
 418    /* put vertex data into vbuf */
 419    buf = pipe_buffer_map(pipe, st->bitmap.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
 420    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 421    pipe_buffer_unmap(pipe, st->bitmap.vbuf);
 422 }
 423
 424
 425
 426 /**
 427  * Render a glBitmap by drawing a textured quad
 428  */
 429 static void
 430 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 431                  GLsizei width, GLsizei height,
 432                  struct pipe_texture *pt)
 433 {
 434    struct st_context *st = ctx->st;
 435    struct pipe_context *pipe = ctx->st->pipe;
 436    struct cso_context *cso = ctx->st->cso_context;
 437    struct st_fragment_program *stfp;
 438    GLuint maxSize;
 439
 440    stfp = combined_bitmap_fragment_program(ctx);
 441
 442    /* limit checks */
 443    /* XXX if the bitmap is larger than the max texture size, break
 444     * it up into chunks.
 445     */
 446    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 447    assert(width <= maxSize);
 448    assert(height <= maxSize);
 449
 450    cso_save_rasterizer(cso);
 451    cso_save_samplers(cso);
 452    cso_save_sampler_textures(cso);
 453    cso_save_viewport(cso);
 454    cso_save_fragment_shader(cso);
 455    cso_save_vertex_shader(cso);
 456
 457    /* rasterizer state: just scissor */
 458    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 459    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 460
 461    /* fragment shader state: TEX lookup program */
 462    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 463
 464    /* vertex shader state: position + texcoord pass-through */
 465    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 466
 467    /* user samplers, plus our bitmap sampler */
 468    {
 469       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 470       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 471       uint i;
 472       for (i = 0; i < st->state.num_samplers; i++) {
 473          samplers[i] = &st->state.samplers[i];
 474       }
 475       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 476       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);   }
 477
 478    /* user textures, plus the bitmap texture */
 479    {
 480       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 481       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 482       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 483       textures[stfp->bitmap_sampler] = pt;
 484       cso_set_sampler_textures(cso, num, textures);
 485    }
 486
 487    /* viewport state: viewport matching window dims */
 488    {
 489       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 490       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 491       const float width = fb->Width;
 492       const float height = fb->Height;
 493       struct pipe_viewport_state vp;
 494       vp.scale[0] =  0.5 * width;
 495       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 496       vp.scale[2] = 1.0;
 497       vp.scale[3] = 1.0;
 498       vp.translate[0] = 0.5 * width;
 499       vp.translate[1] = 0.5 * height;
 500       vp.translate[2] = 0.0;
 501       vp.translate[3] = 0.0;
 502       cso_set_viewport(cso, &vp);
 503    }
 504
 505    /* draw textured quad */
 506    setup_bitmap_vertex_data(st, x, y, width, height,
 507                             ctx->Current.RasterPos[2],
 508                             ctx->Current.RasterColor);
 509
 510    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 511                            PIPE_PRIM_TRIANGLE_FAN,
 512                            4,  /* verts */
 513                            3); /* attribs/vert */
 514
 515
 516    /* restore state */
 517    cso_restore_rasterizer(cso);
 518    cso_restore_samplers(cso);
 519    cso_restore_sampler_textures(cso);
 520    cso_restore_viewport(cso);
 521    cso_restore_fragment_shader(cso);
 522    cso_restore_vertex_shader(cso);
 523 }
 524
 525
 526 static void
 527 reset_cache(struct st_context *st)
 528 {
 529    struct pipe_context *pipe = st->pipe;
 530    struct pipe_screen *screen = pipe->screen;
 531    struct bitmap_cache *cache = st->bitmap.cache;
 532
 533    //memset(cache->buffer, 0xff, sizeof(cache->buffer));
 534    cache->empty = GL_TRUE;
 535
 536    cache->xmin = 1000000;
 537    cache->xmax = -1000000;
 538    cache->ymin = 1000000;
 539    cache->ymax = -1000000;
 540
 541    assert(!cache->texture);
 542
 543    /* allocate a new texture */
 544    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 545                                       st->bitmap.tex_format, 0,
 546                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 547                                       1, 0,
 548                                       PIPE_TEXTURE_USAGE_SAMPLER);
 549
 550    /* Map the texture surface.
 551     * Subsequent glBitmap calls will write into the texture image.
 552     */
 553    cache->surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0,
 554                                          PIPE_BUFFER_USAGE_CPU_WRITE);
 555    cache->buffer = screen->surface_map(screen, cache->surf,
 556                                        PIPE_BUFFER_USAGE_CPU_WRITE);
 557
 558    /* init image to all 0xff */
 559    memset(cache->buffer, 0xff, BITMAP_CACHE_WIDTH * BITMAP_CACHE_HEIGHT);
 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       struct bitmap_cache *cache = st->bitmap.cache;
 571
 572       if (st->ctx->DrawBuffer) {
 573          struct pipe_context *pipe = st->pipe;
 574          struct pipe_screen *screen = pipe->screen;
 575
 576          assert(cache->xmin <= cache->xmax);
 577          /*
 578          printf("flush size %d x %d  at %d, %d\n",
 579                 cache->xmax - cache->xmin,
 580                 cache->ymax - cache->ymin,
 581                 cache->xpos, cache->ypos);
 582          */
 583
 584          /* The texture surface has been mapped until now.
 585           * So unmap and release the texture surface before drawing.
 586           */
 587          screen->surface_unmap(screen, cache->surf);
 588          screen->tex_surface_release(screen, &cache->surf);
 589
 590          draw_bitmap_quad(st->ctx,
 591                           cache->xpos,
 592                           cache->ypos,
 593                           st->ctx->Current.RasterPos[2],
 594                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 595                           cache->texture);
 596       }
 597
 598       /* release/free the texture */
 599       pipe_texture_reference(&cache->texture, NULL);
 600
 601       reset_cache(st);
 602    }
 603 }
 604
 605
 606 /**
 607  * Try to accumulate this glBitmap call in the bitmap cache.
 608  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 609  */
 610 static GLboolean
 611 accum_bitmap(struct st_context *st,
 612              GLint x, GLint y, GLsizei width, GLsizei height,
 613              const struct gl_pixelstore_attrib *unpack,
 614              const GLubyte *bitmap )
 615 {
 616    struct bitmap_cache *cache = st->bitmap.cache;
 617    int px = -999, py;
 618
 619    if (width > BITMAP_CACHE_WIDTH ||
 620        height > BITMAP_CACHE_HEIGHT)
 621       return GL_FALSE; /* too big to cache */
 622
 623    if (!cache->empty) {
 624       px = x - cache->xpos;  /* pos in buffer */
 625       py = y - cache->ypos;
 626       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 627           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 628          /* This bitmap would extend beyond cache bounds,
 629           * so flush and continue.
 630           */
 631          st_flush_bitmap_cache(st);
 632       }
 633    }
 634
 635    if (cache->empty) {
 636       /* Initialize.  Center bitmap vertically in the buffer. */
 637       px = 0;
 638       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 639       cache->xpos = x;
 640       cache->ypos = y - py;
 641       cache->empty = GL_FALSE;
 642    }
 643
 644    assert(px != -999);
 645
 646    if (x < cache->xmin)
 647       cache->xmin = x;
 648    if (y < cache->ymin)
 649       cache->ymin = y;
 650    if (x + width > cache->xmax)
 651       cache->xmax = x + width;
 652    if (y + height > cache->ymax)
 653       cache->ymax = y + height;
 654
 655    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 656                  cache->buffer, BITMAP_CACHE_WIDTH);
 657
 658    return GL_TRUE; /* accumulated */
 659 }
 660
 661
 662
 663 /**
 664  * Called via ctx->Driver.Bitmap()
 665  */
 666 static void
 667 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 668           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 669 {
 670    struct st_context *st = ctx->st;
 671    struct pipe_texture *pt;
 672
 673    if (width == 0 || height == 0)
 674       return;
 675
 676    st_validate_state(st);
 677
 678    if (!st->bitmap.vs) {
 679       /* create pass-through vertex shader now */
 680       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 681                                       TGSI_SEMANTIC_COLOR,
 682                                       TGSI_SEMANTIC_GENERIC };
 683       const uint semantic_indexes[] = { 0, 0, 0 };
 684       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 685                                                           semantic_names,
 686                                                           semantic_indexes,
 687                                                           &st->bitmap.vert_shader);
 688    }
 689
 690    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 691       return;
 692
 693    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 694    if (pt) {
 695       assert(pt->target == PIPE_TEXTURE_2D);
 696       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 697                        width, height, pt);
 698       /* release/free the texture */
 699       pipe_texture_reference(&pt, NULL);
 700    }
 701 }
 702
 703
 704 /** Per-context init */
 705 void
 706 st_init_bitmap_functions(struct dd_function_table *functions)
 707 {
 708    functions->Bitmap = st_Bitmap;
 709 }
 710
 711
 712 /** Per-context init */
 713 void
 714 st_init_bitmap(struct st_context *st)
 715 {
 716    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 717    struct pipe_context *pipe = st->pipe;
 718    struct pipe_screen *screen = pipe->screen;
 719
 720    /* init sampler state once */
 721    memset(sampler, 0, sizeof(*sampler));
 722    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 723    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 724    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 725    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 726    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 727    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 728    sampler->normalized_coords = 1;
 729
 730    /* init baseline rasterizer state once */
 731    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 732    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 733    st->bitmap.rasterizer.bypass_vs = 1;
 734
 735    /* find a usable texture format */
 736    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE)) {
 737       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 738    }
 739    else {
 740       /* XXX support more formats */
 741       assert(0);
 742    }
 743
 744    /* alloc bitmap cache object */
 745    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 746
 747    reset_cache(st);
 748 }
 749
 750
 751 /** Per-context tear-down */
 752 void
 753 st_destroy_bitmap(struct st_context *st)
 754 {
 755    struct pipe_context *pipe = st->pipe;
 756    struct pipe_screen *screen = pipe->screen;
 757    struct bitmap_cache *cache = st->bitmap.cache;
 758
 759    screen->surface_unmap(screen, cache->surf);
 760    screen->tex_surface_release(screen, &cache->surf);
 761
 762    if (st->bitmap.vs) {
 763       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 764       st->bitmap.vs = NULL;
 765    }
 766
 767    if (st->bitmap.vbuf) {
 768       pipe_buffer_destroy(pipe, st->bitmap.vbuf);
 769       st->bitmap.vbuf = NULL;
 770    }
 771
 772    if (st->bitmap.cache) {
 773       pipe_texture_release(&st->bitmap.cache->texture);
 774       FREE(st->bitmap.cache);
 775       st->bitmap.cache = NULL;
 776    }
 777 }