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