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    if (!pt) {
 330       _mesa_unmap_bitmap_pbo(ctx, unpack);
 331       return NULL;
 332    }
 333
 334    surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 335
 336    /* map texture surface */
 337    dest = pipe_surface_map(surface);
 338
 339    /* Put image into texture surface */
 340    memset(dest, 0xff, height * surface->pitch);
 341    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 342                  dest, surface->pitch);
 343
 344    _mesa_unmap_bitmap_pbo(ctx, unpack);
 345
 346    /* Release surface */
 347    pipe_surface_unmap(surface);
 348    pipe_surface_reference(&surface, NULL);
 349    pipe->texture_update(pipe, pt, 0, 0x1);
 350
 351    return pt;
 352 }
 353
 354
 355 static void
 356 setup_bitmap_vertex_data(struct st_context *st,
 357                          int x, int y, int width, int height,
 358                          float z, const float color[4])
 359 {
 360    struct pipe_context *pipe = st->pipe;
 361    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 362    const GLfloat fb_width = fb->Width;
 363    const GLfloat fb_height = fb->Height;
 364    const GLfloat x0 = x;
 365    const GLfloat x1 = x + width;
 366    const GLfloat y0 = y;
 367    const GLfloat y1 = y + height;
 368    const GLfloat sLeft = 0.0F, sRight = 1.0F;
 369    const GLfloat tTop = 0.0, tBot = 1.0 - tTop;
 370    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 371    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 372    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 373    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 374    GLuint i;
 375    void *buf;
 376
 377    if (!st->bitmap.vbuf) {
 378       st->bitmap.vbuf = pipe_buffer_create(pipe, 32, PIPE_BUFFER_USAGE_VERTEX,
 379                                            sizeof(st->bitmap.vertices));
 380    }
 381
 382    /* Positions are in clip coords since we need to do clipping in case
 383     * the bitmap quad goes beyond the window bounds.
 384     */
 385    st->bitmap.vertices[0][0][0] = clip_x0;
 386    st->bitmap.vertices[0][0][1] = clip_y0;
 387    st->bitmap.vertices[0][2][0] = sLeft;
 388    st->bitmap.vertices[0][2][1] = tTop;
 389
 390    st->bitmap.vertices[1][0][0] = clip_x1;
 391    st->bitmap.vertices[1][0][1] = clip_y0;
 392    st->bitmap.vertices[1][2][0] = sRight;
 393    st->bitmap.vertices[1][2][1] = tTop;
 394
 395    st->bitmap.vertices[2][0][0] = clip_x1;
 396    st->bitmap.vertices[2][0][1] = clip_y1;
 397    st->bitmap.vertices[2][2][0] = sRight;
 398    st->bitmap.vertices[2][2][1] = tBot;
 399
 400    st->bitmap.vertices[3][0][0] = clip_x0;
 401    st->bitmap.vertices[3][0][1] = clip_y1;
 402    st->bitmap.vertices[3][2][0] = sLeft;
 403    st->bitmap.vertices[3][2][1] = tBot;
 404
 405    /* same for all verts: */
 406    for (i = 0; i < 4; i++) {
 407       st->bitmap.vertices[i][0][2] = z;
 408       st->bitmap.vertices[i][0][3] = 1.0;
 409       st->bitmap.vertices[i][1][0] = color[0];
 410       st->bitmap.vertices[i][1][1] = color[1];
 411       st->bitmap.vertices[i][1][2] = color[2];
 412       st->bitmap.vertices[i][1][3] = color[3];
 413       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 414       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 415    }
 416
 417    /* put vertex data into vbuf */
 418    buf = pipe_buffer_map(pipe, st->bitmap.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
 419    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 420    pipe_buffer_unmap(pipe, st->bitmap.vbuf);
 421 }
 422
 423
 424
 425 /**
 426  * Render a glBitmap by drawing a textured quad
 427  */
 428 static void
 429 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 430                  GLsizei width, GLsizei height,
 431                  struct pipe_texture *pt)
 432 {
 433    struct st_context *st = ctx->st;
 434    struct pipe_context *pipe = ctx->st->pipe;
 435    struct cso_context *cso = ctx->st->cso_context;
 436    struct st_fragment_program *stfp;
 437    GLuint maxSize;
 438
 439    stfp = combined_bitmap_fragment_program(ctx);
 440
 441    /* limit checks */
 442    /* XXX if the bitmap is larger than the max texture size, break
 443     * it up into chunks.
 444     */
 445    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 446    assert(width <= maxSize);
 447    assert(height <= maxSize);
 448
 449    cso_save_rasterizer(cso);
 450    cso_save_samplers(cso);
 451    cso_save_sampler_textures(cso);
 452    cso_save_viewport(cso);
 453    cso_save_fragment_shader(cso);
 454    cso_save_vertex_shader(cso);
 455
 456    /* rasterizer state: just scissor */
 457    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 458    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 459
 460    /* fragment shader state: TEX lookup program */
 461    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 462
 463    /* vertex shader state: position + texcoord pass-through */
 464    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 465
 466    /* user samplers, plus our bitmap sampler */
 467    {
 468       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 469       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 470       uint i;
 471       for (i = 0; i < st->state.num_samplers; i++) {
 472          samplers[i] = &st->state.samplers[i];
 473       }
 474       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 475       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);   }
 476
 477    /* user textures, plus the bitmap texture */
 478    {
 479       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 480       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 481       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 482       textures[stfp->bitmap_sampler] = pt;
 483       cso_set_sampler_textures(cso, num, textures);
 484    }
 485
 486    /* viewport state: viewport matching window dims */
 487    {
 488       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 489       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 490       const float width = fb->Width;
 491       const float height = fb->Height;
 492       struct pipe_viewport_state vp;
 493       vp.scale[0] =  0.5 * width;
 494       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 495       vp.scale[2] = 1.0;
 496       vp.scale[3] = 1.0;
 497       vp.translate[0] = 0.5 * width;
 498       vp.translate[1] = 0.5 * height;
 499       vp.translate[2] = 0.0;
 500       vp.translate[3] = 0.0;
 501       cso_set_viewport(cso, &vp);
 502    }
 503
 504    /* draw textured quad */
 505    setup_bitmap_vertex_data(st, x, y, width, height,
 506                             ctx->Current.RasterPos[2],
 507                             ctx->Current.RasterColor);
 508
 509    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 510                            PIPE_PRIM_TRIANGLE_FAN,
 511                            4,  /* verts */
 512                            3); /* attribs/vert */
 513
 514
 515    /* restore state */
 516    cso_restore_rasterizer(cso);
 517    cso_restore_samplers(cso);
 518    cso_restore_sampler_textures(cso);
 519    cso_restore_viewport(cso);
 520    cso_restore_fragment_shader(cso);
 521    cso_restore_vertex_shader(cso);
 522 }
 523
 524
 525 static void
 526 reset_cache(struct st_context *st)
 527 {
 528    struct pipe_context *pipe = st->pipe;
 529    struct pipe_screen *screen = pipe->screen;
 530    struct bitmap_cache *cache = st->bitmap.cache;
 531
 532    //memset(cache->buffer, 0xff, sizeof(cache->buffer));
 533    cache->empty = GL_TRUE;
 534
 535    cache->xmin = 1000000;
 536    cache->xmax = -1000000;
 537    cache->ymin = 1000000;
 538    cache->ymax = -1000000;
 539
 540    assert(!cache->texture);
 541
 542    /* allocate a new texture */
 543    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 544                                       st->bitmap.tex_format, 0,
 545                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 546                                       1, 0);
 547
 548    /* Map the texture surface.
 549     * Subsequent glBitmap calls will write into the texture image.
 550     */
 551    cache->surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0);
 552    cache->buffer = pipe_surface_map(cache->surf);
 553
 554    /* init image to all 0xff */
 555    memset(cache->buffer, 0xff, BITMAP_CACHE_WIDTH * BITMAP_CACHE_HEIGHT);
 556 }
 557
 558
 559 /**
 560  * If there's anything in the bitmap cache, draw/flush it now.
 561  */
 562 void
 563 st_flush_bitmap_cache(struct st_context *st)
 564 {
 565    if (!st->bitmap.cache->empty) {
 566       if (st->ctx->DrawBuffer) {
 567          struct bitmap_cache *cache = st->bitmap.cache;
 568          struct pipe_context *pipe = st->pipe;
 569
 570          assert(cache->xmin <= cache->xmax);
 571          /*
 572          printf("flush size %d x %d  at %d, %d\n",
 573                 cache->xmax - cache->xmin,
 574                 cache->ymax - cache->ymin,
 575                 cache->xpos, cache->ypos);
 576          */
 577
 578          /* The texture surface has been mapped until now.
 579           * So unmap and release the texture surface before drawing.
 580           */
 581          pipe_surface_unmap(cache->surf);
 582          pipe_surface_reference(&cache->surf, NULL);
 583
 584          /* XXX is this needed? */
 585          pipe->texture_update(pipe, cache->texture, 0, 0x1);
 586
 587          draw_bitmap_quad(st->ctx,
 588                           cache->xpos,
 589                           cache->ypos,
 590                           st->ctx->Current.RasterPos[2],
 591                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 592                           cache->texture);
 593
 594          /* release/free the texture */
 595          pipe_texture_reference(&cache->texture, NULL);
 596       }
 597       reset_cache(st);
 598    }
 599 }
 600
 601
 602 /**
 603  * Try to accumulate this glBitmap call in the bitmap cache.
 604  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 605  */
 606 static GLboolean
 607 accum_bitmap(struct st_context *st,
 608              GLint x, GLint y, GLsizei width, GLsizei height,
 609              const struct gl_pixelstore_attrib *unpack,
 610              const GLubyte *bitmap )
 611 {
 612    struct bitmap_cache *cache = st->bitmap.cache;
 613    int px = -999, py;
 614
 615    if (width > BITMAP_CACHE_WIDTH ||
 616        height > BITMAP_CACHE_HEIGHT)
 617       return GL_FALSE; /* too big to cache */
 618
 619    if (!cache->empty) {
 620       px = x - cache->xpos;  /* pos in buffer */
 621       py = y - cache->ypos;
 622       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 623           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 624          /* This bitmap would extend beyond cache bounds,
 625           * so flush and continue.
 626           */
 627          st_flush_bitmap_cache(st);
 628       }
 629    }
 630
 631    if (cache->empty) {
 632       /* Initialize.  Center bitmap vertically in the buffer. */
 633       px = 0;
 634       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 635       cache->xpos = x;
 636       cache->ypos = y - py;
 637       cache->empty = GL_FALSE;
 638    }
 639
 640    assert(px != -999);
 641
 642    if (x < cache->xmin)
 643       cache->xmin = x;
 644    if (y < cache->ymin)
 645       cache->ymin = y;
 646    if (x + width > cache->xmax)
 647       cache->xmax = x + width;
 648    if (y + height > cache->ymax)
 649       cache->ymax = y + height;
 650
 651    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 652                  cache->buffer, BITMAP_CACHE_WIDTH);
 653
 654    return GL_TRUE; /* accumulated */
 655 }
 656
 657
 658
 659 /**
 660  * Called via ctx->Driver.Bitmap()
 661  */
 662 static void
 663 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 664           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 665 {
 666    struct st_context *st = ctx->st;
 667    struct pipe_texture *pt;
 668
 669    st_validate_state(st);
 670
 671    if (!st->bitmap.vs) {
 672       /* create pass-through vertex shader now */
 673       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 674                                       TGSI_SEMANTIC_COLOR,
 675                                       TGSI_SEMANTIC_GENERIC };
 676       const uint semantic_indexes[] = { 0, 0, 0 };
 677       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 678                                                           semantic_names,
 679                                                           semantic_indexes,
 680                                                           &st->bitmap.vert_shader);
 681    }
 682
 683    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 684       return;
 685
 686    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 687    if (pt) {
 688       assert(pt->target == PIPE_TEXTURE_2D);
 689       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 690                        width, height, pt);
 691       /* release/free the texture */
 692       pipe_texture_reference(&pt, NULL);
 693    }
 694 }
 695
 696
 697 /** Per-context init */
 698 void
 699 st_init_bitmap_functions(struct dd_function_table *functions)
 700 {
 701    functions->Bitmap = st_Bitmap;
 702 }
 703
 704
 705 /** Per-context init */
 706 void
 707 st_init_bitmap(struct st_context *st)
 708 {
 709    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 710    struct pipe_context *pipe = st->pipe;
 711    struct pipe_screen *screen = pipe->screen;
 712
 713    /* init sampler state once */
 714    memset(sampler, 0, sizeof(*sampler));
 715    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 716    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 717    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 718    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 719    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 720    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 721    sampler->normalized_coords = 1;
 722
 723    /* init baseline rasterizer state once */
 724    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 725    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 726    st->bitmap.rasterizer.bypass_vs = 1;
 727
 728    /* find a usable texture format */
 729    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE)) {
 730       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 731    }
 732    else {
 733       /* XXX support more formats */
 734       assert(0);
 735    }
 736
 737    /* alloc bitmap cache object */
 738    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 739
 740    reset_cache(st);
 741 }
 742
 743
 744 /** Per-context tear-down */
 745 void
 746 st_destroy_bitmap(struct st_context *st)
 747 {
 748    struct pipe_context *pipe = st->pipe;
 749
 750    if (st->bitmap.vs) {
 751       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 752       st->bitmap.vs = NULL;
 753    }
 754
 755    if (st->bitmap.vbuf) {
 756       pipe_buffer_destroy(pipe, st->bitmap.vbuf);
 757       st->bitmap.vbuf = NULL;
 758    }
 759
 760    if (st->bitmap.cache) {
 761       pipe_texture_release(&st->bitmap.cache->texture);
 762       FREE(st->bitmap.cache);
 763       st->bitmap.cache = NULL;
 764    }
 765 }