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 "st_inlines.h"
  51
  52 #include "pipe/p_context.h"
  53 #include "pipe/p_defines.h"
  54 #include "pipe/p_inlines.h"
  55 #include "util/u_tile.h"
  56 #include "util/u_draw_quad.h"
  57 #include "util/u_simple_shaders.h"
  58 #include "shader/prog_instruction.h"
  59 #include "cso_cache/cso_context.h"
  60
  61
  62
  63 /**
  64  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  65  * is stored in a texture image.  An alpha8 texture format is used.
  66  * The fragment shader samples a bit (texel) from the texture, then
  67  * discards the fragment if the bit is off.
  68  *
  69  * Note that we actually store the inverse image of the bitmap to
  70  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  71  * and an "off" bit is stored as texel=0xff.  Then we kill the
  72  * fragment if the negated texel value is less than zero.
  73  */
  74
  75
  76 /**
  77  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  78  * buffer which is then rendered en mass upon a flush, state change, etc.
  79  * A wide, short buffer is used to target the common case of a series
  80  * of glBitmap calls being used to draw text.
  81  */
  82 static GLboolean UseBitmapCache = GL_TRUE;
  83
  84
  85 #define BITMAP_CACHE_WIDTH  512
  86 #define BITMAP_CACHE_HEIGHT 32
  87
  88 struct bitmap_cache
  89 {
  90    /** Window pos to render the cached image */
  91    GLint xpos, ypos;
  92    /** Bounds of region used in window coords */
  93    GLint xmin, ymin, xmax, ymax;
  94
  95    GLfloat color[4];
  96
  97    /** Bitmap's Z position */
  98    GLfloat zpos;
  99
 100    struct pipe_texture *texture;
 101    struct pipe_transfer *trans;
 102
 103    GLboolean empty;
 104
 105    /** An I8 texture image: */
 106    ubyte *buffer;
 107 };
 108
 109
 110 /** Epsilon for Z comparisons */
 111 #define Z_EPSILON 1e-06
 112
 113
 114 /**
 115  * Make fragment program for glBitmap:
 116  *   Sample the texture and kill the fragment if the bit is 0.
 117  * This program will be combined with the user's fragment program.
 118  */
 119 static struct st_fragment_program *
 120 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 121 {
 122    struct st_fragment_program *stfp;
 123    struct gl_program *p;
 124    GLuint ic = 0;
 125
 126    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 127    if (!p)
 128       return NULL;
 129
 130    p->NumInstructions = 3;
 131
 132    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 133    if (!p->Instructions) {
 134       ctx->Driver.DeleteProgram(ctx, p);
 135       return NULL;
 136    }
 137    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 138
 139    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 140    p->Instructions[ic].Opcode = OPCODE_TEX;
 141    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 142    p->Instructions[ic].DstReg.Index = 0;
 143    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 144    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 145    p->Instructions[ic].TexSrcUnit = samplerIndex;
 146    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 147    ic++;
 148
 149    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 150    p->Instructions[ic].Opcode = OPCODE_KIL;
 151    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 152
 153    if (ctx->st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 154       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 155
 156    p->Instructions[ic].SrcReg[0].Index = 0;
 157    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 158    ic++;
 159
 160    /* END; */
 161    p->Instructions[ic++].Opcode = OPCODE_END;
 162
 163    assert(ic == p->NumInstructions);
 164
 165    p->InputsRead = FRAG_BIT_TEX0;
 166    p->OutputsWritten = 0x0;
 167    p->SamplersUsed = (1 << samplerIndex);
 168
 169    stfp = (struct st_fragment_program *) p;
 170    stfp->Base.UsesKill = GL_TRUE;
 171
 172    return stfp;
 173 }
 174
 175
 176 static int
 177 find_free_bit(uint bitfield)
 178 {
 179    int i;
 180    for (i = 0; i < 32; i++) {
 181       if ((bitfield & (1 << i)) == 0) {
 182          return i;
 183       }
 184    }
 185    return -1;
 186 }
 187
 188
 189 /**
 190  * Combine basic bitmap fragment program with the user-defined program.
 191  */
 192 static struct st_fragment_program *
 193 combined_bitmap_fragment_program(GLcontext *ctx)
 194 {
 195    struct st_context *st = ctx->st;
 196    struct st_fragment_program *stfp = st->fp;
 197
 198    if (!stfp->bitmap_program) {
 199       /*
 200        * Generate new program which is the user-defined program prefixed
 201        * with the bitmap sampler/kill instructions.
 202        */
 203       struct st_fragment_program *bitmap_prog;
 204       uint sampler;
 205
 206       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 207       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 208
 209       stfp->bitmap_program = (struct st_fragment_program *)
 210          _mesa_combine_programs(ctx,
 211                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 212       stfp->bitmap_program->bitmap_sampler = sampler;
 213
 214       /* done with this after combining */
 215       st_reference_fragprog(st, &bitmap_prog, NULL);
 216
 217 #if 0
 218       {
 219          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 220          printf("Combined bitmap program:\n");
 221          _mesa_print_program(p);
 222          printf("InputsRead: 0x%x\n", p->InputsRead);
 223          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 224          _mesa_print_parameter_list(p->Parameters);
 225       }
 226 #endif
 227
 228       /* translate to TGSI tokens */
 229       st_translate_fragment_program(st, stfp->bitmap_program, NULL);
 230    }
 231
 232    return stfp->bitmap_program;
 233 }
 234
 235
 236 /**
 237  * Copy user-provide bitmap bits into texture buffer, expanding
 238  * bits into texels.
 239  * "On" bits will set texels to 0x0.
 240  * "Off" bits will not modify texels.
 241  * Note that the image is actually going to be upside down in
 242  * the texture.  We deal with that with texcoords.
 243  */
 244 static void
 245 unpack_bitmap(struct st_context *st,
 246               GLint px, GLint py, GLsizei width, GLsizei height,
 247               const struct gl_pixelstore_attrib *unpack,
 248               const GLubyte *bitmap,
 249               ubyte *destBuffer, uint destStride)
 250 {
 251    destBuffer += py * destStride + px;
 252
 253    _mesa_expand_bitmap(width, height, unpack, bitmap,
 254                        destBuffer, destStride, 0x0);
 255 }
 256
 257
 258 /**
 259  * Create a texture which represents a bitmap image.
 260  */
 261 static struct pipe_texture *
 262 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 263                     const struct gl_pixelstore_attrib *unpack,
 264                     const GLubyte *bitmap)
 265 {
 266    struct pipe_context *pipe = ctx->st->pipe;
 267    struct pipe_screen *screen = pipe->screen;
 268    struct pipe_transfer *transfer;
 269    ubyte *dest;
 270    struct pipe_texture *pt;
 271
 272    /* PBO source... */
 273    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 274    if (!bitmap) {
 275       return NULL;
 276    }
 277
 278    /**
 279     * Create texture to hold bitmap pattern.
 280     */
 281    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 282                           0, width, height, 1,
 283                           PIPE_TEXTURE_USAGE_SAMPLER);
 284    if (!pt) {
 285       _mesa_unmap_pbo_source(ctx, unpack);
 286       return NULL;
 287    }
 288
 289    transfer = st_no_flush_get_tex_transfer(st_context(ctx), pt, 0, 0, 0,
 290                                            PIPE_TRANSFER_WRITE,
 291                                            0, 0, width, height);
 292
 293    dest = screen->transfer_map(screen, transfer);
 294
 295    /* Put image into texture transfer */
 296    memset(dest, 0xff, height * transfer->stride);
 297    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 298                  dest, transfer->stride);
 299
 300    _mesa_unmap_pbo_source(ctx, unpack);
 301
 302    /* Release transfer */
 303    screen->transfer_unmap(screen, transfer);
 304    screen->tex_transfer_destroy(transfer);
 305
 306    return pt;
 307 }
 308
 309 static GLuint
 310 setup_bitmap_vertex_data(struct st_context *st,
 311                          int x, int y, int width, int height,
 312                          float z, const float color[4])
 313 {
 314    struct pipe_context *pipe = st->pipe;
 315    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 316    const GLfloat fb_width = (GLfloat)fb->Width;
 317    const GLfloat fb_height = (GLfloat)fb->Height;
 318    const GLfloat x0 = (GLfloat)x;
 319    const GLfloat x1 = (GLfloat)(x + width);
 320    const GLfloat y0 = (GLfloat)y;
 321    const GLfloat y1 = (GLfloat)(y + height);
 322    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 323    const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 324    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 325    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 326    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 327    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 328
 329    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 330     * no_flush) updates to buffers where we know there is no conflict
 331     * with previous data.  Currently using max_slots > 1 will cause
 332     * synchronous rendering if the driver flushes its command buffers
 333     * between one bitmap and the next.  Our flush hook below isn't
 334     * sufficient to catch this as the driver doesn't tell us when it
 335     * flushes its own command buffers.  Until this gets fixed, pay the
 336     * price of allocating a new buffer for each bitmap cache-flush to
 337     * avoid synchronous rendering.
 338     */
 339    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 340    GLuint i;
 341
 342    if (st->bitmap.vbuf_slot >= max_slots) {
 343       pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 344       st->bitmap.vbuf_slot = 0;
 345    }
 346
 347    if (!st->bitmap.vbuf) {
 348       st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32,
 349                                            PIPE_BUFFER_USAGE_VERTEX,
 350                                            max_slots * sizeof(st->bitmap.vertices));
 351    }
 352
 353    /* Positions are in clip coords since we need to do clipping in case
 354     * the bitmap quad goes beyond the window bounds.
 355     */
 356    st->bitmap.vertices[0][0][0] = clip_x0;
 357    st->bitmap.vertices[0][0][1] = clip_y0;
 358    st->bitmap.vertices[0][2][0] = sLeft;
 359    st->bitmap.vertices[0][2][1] = tTop;
 360
 361    st->bitmap.vertices[1][0][0] = clip_x1;
 362    st->bitmap.vertices[1][0][1] = clip_y0;
 363    st->bitmap.vertices[1][2][0] = sRight;
 364    st->bitmap.vertices[1][2][1] = tTop;
 365
 366    st->bitmap.vertices[2][0][0] = clip_x1;
 367    st->bitmap.vertices[2][0][1] = clip_y1;
 368    st->bitmap.vertices[2][2][0] = sRight;
 369    st->bitmap.vertices[2][2][1] = tBot;
 370
 371    st->bitmap.vertices[3][0][0] = clip_x0;
 372    st->bitmap.vertices[3][0][1] = clip_y1;
 373    st->bitmap.vertices[3][2][0] = sLeft;
 374    st->bitmap.vertices[3][2][1] = tBot;
 375
 376    /* same for all verts: */
 377    for (i = 0; i < 4; i++) {
 378       st->bitmap.vertices[i][0][2] = z;
 379       st->bitmap.vertices[i][0][3] = 1.0;
 380       st->bitmap.vertices[i][1][0] = color[0];
 381       st->bitmap.vertices[i][1][1] = color[1];
 382       st->bitmap.vertices[i][1][2] = color[2];
 383       st->bitmap.vertices[i][1][3] = color[3];
 384       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 385       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 386    }
 387
 388    /* put vertex data into vbuf */
 389    st_no_flush_pipe_buffer_write(st,
 390                                  st->bitmap.vbuf,
 391                                  st->bitmap.vbuf_slot * sizeof st->bitmap.vertices,
 392                                  sizeof st->bitmap.vertices,
 393                                  st->bitmap.vertices);
 394
 395    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 396 }
 397
 398
 399
 400 /**
 401  * Render a glBitmap by drawing a textured quad
 402  */
 403 static void
 404 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 405                  GLsizei width, GLsizei height,
 406                  struct pipe_texture *pt,
 407                  const GLfloat *color)
 408 {
 409    struct st_context *st = ctx->st;
 410    struct pipe_context *pipe = ctx->st->pipe;
 411    struct cso_context *cso = ctx->st->cso_context;
 412    struct st_fragment_program *stfp;
 413    GLuint maxSize;
 414    GLuint offset;
 415
 416    stfp = combined_bitmap_fragment_program(ctx);
 417
 418    /* As an optimization, Mesa's fragment programs will sometimes get the
 419     * primary color from a statevar/constant rather than a varying variable.
 420     * when that's the case, we need to ensure that we use the 'color'
 421     * parameter and not the current attribute color (which may have changed
 422     * through glRasterPos and state validation.
 423     * So, we force the proper color here.  Not elegant, but it works.
 424     */
 425    {
 426       GLfloat colorSave[4];
 427       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 428       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 429       st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 430       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 431    }
 432
 433
 434    /* limit checks */
 435    /* XXX if the bitmap is larger than the max texture size, break
 436     * it up into chunks.
 437     */
 438    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 439    assert(width <= (GLsizei)maxSize);
 440    assert(height <= (GLsizei)maxSize);
 441
 442    cso_save_rasterizer(cso);
 443    cso_save_samplers(cso);
 444    cso_save_sampler_textures(cso);
 445    cso_save_viewport(cso);
 446    cso_save_fragment_shader(cso);
 447    cso_save_vertex_shader(cso);
 448
 449    /* rasterizer state: just scissor */
 450    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 451    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 452
 453    /* fragment shader state: TEX lookup program */
 454    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 455
 456    /* vertex shader state: position + texcoord pass-through */
 457    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 458
 459    /* user samplers, plus our bitmap sampler */
 460    {
 461       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 462       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 463       uint i;
 464       for (i = 0; i < st->state.num_samplers; i++) {
 465          samplers[i] = &st->state.samplers[i];
 466       }
 467       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 468       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 469    }
 470
 471    /* user textures, plus the bitmap texture */
 472    {
 473       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 474       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 475       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 476       textures[stfp->bitmap_sampler] = pt;
 477       cso_set_sampler_textures(cso, num, textures);
 478    }
 479
 480    /* viewport state: viewport matching window dims */
 481    {
 482       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 483       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 484       const GLfloat width = (GLfloat)fb->Width;
 485       const GLfloat height = (GLfloat)fb->Height;
 486       struct pipe_viewport_state vp;
 487       vp.scale[0] =  0.5f * width;
 488       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 489       vp.scale[2] = 1.0f;
 490       vp.scale[3] = 1.0f;
 491       vp.translate[0] = 0.5f * width;
 492       vp.translate[1] = 0.5f * height;
 493       vp.translate[2] = 0.0f;
 494       vp.translate[3] = 0.0f;
 495       cso_set_viewport(cso, &vp);
 496    }
 497
 498    /* draw textured quad */
 499    offset = setup_bitmap_vertex_data(st, x, y, width, height, z, color);
 500
 501    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 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    struct pipe_context *pipe = st->pipe;
 521    struct pipe_screen *screen = pipe->screen;
 522    struct bitmap_cache *cache = st->bitmap.cache;
 523
 524    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 525    cache->empty = GL_TRUE;
 526
 527    cache->xmin = 1000000;
 528    cache->xmax = -1000000;
 529    cache->ymin = 1000000;
 530    cache->ymax = -1000000;
 531
 532    if (cache->trans) {
 533       screen->tex_transfer_destroy(cache->trans);
 534       cache->trans = NULL;
 535    }
 536
 537    assert(!cache->texture);
 538
 539    /* allocate a new texture */
 540    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 541                                       st->bitmap.tex_format, 0,
 542                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 543                                       1, PIPE_TEXTURE_USAGE_SAMPLER);
 544
 545 }
 546
 547 static void
 548 create_cache_trans(struct st_context *st)
 549 {
 550    struct pipe_context *pipe = st->pipe;
 551    struct pipe_screen *screen = pipe->screen;
 552    struct bitmap_cache *cache = st->bitmap.cache;
 553
 554    if (cache->trans)
 555       return;
 556
 557    /* Map the texture transfer.
 558     * Subsequent glBitmap calls will write into the texture image.
 559     */
 560    cache->trans = st_no_flush_get_tex_transfer(st, cache->texture, 0, 0, 0,
 561                                                PIPE_TRANSFER_WRITE, 0, 0,
 562                                                BITMAP_CACHE_WIDTH,
 563                                                BITMAP_CACHE_HEIGHT);
 564    cache->buffer = screen->transfer_map(screen, cache->trans);
 565
 566    /* init image to all 0xff */
 567    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 568 }
 569
 570
 571 /**
 572  * If there's anything in the bitmap cache, draw/flush it now.
 573  */
 574 void
 575 st_flush_bitmap_cache(struct st_context *st)
 576 {
 577    if (!st->bitmap.cache->empty) {
 578       struct bitmap_cache *cache = st->bitmap.cache;
 579
 580       if (st->ctx->DrawBuffer) {
 581          struct pipe_context *pipe = st->pipe;
 582          struct pipe_screen *screen = pipe->screen;
 583
 584          assert(cache->xmin <= cache->xmax);
 585
 586 /*         printf("flush size %d x %d  at %d, %d\n",
 587                 cache->xmax - cache->xmin,
 588                 cache->ymax - cache->ymin,
 589                 cache->xpos, cache->ypos);
 590 */
 591
 592          /* The texture transfer has been mapped until now.
 593           * So unmap and release the texture transfer before drawing.
 594           */
 595          if (cache->trans) {
 596             screen->transfer_unmap(screen, cache->trans);
 597             cache->buffer = NULL;
 598
 599             screen->tex_transfer_destroy(cache->trans);
 600             cache->trans = NULL;
 601          }
 602
 603          draw_bitmap_quad(st->ctx,
 604                           cache->xpos,
 605                           cache->ypos,
 606                           cache->zpos,
 607                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 608                           cache->texture,
 609                           cache->color);
 610       }
 611
 612       /* release/free the texture */
 613       pipe_texture_reference(&cache->texture, NULL);
 614
 615       reset_cache(st);
 616    }
 617 }
 618
 619 /* Flush bitmap cache and release vertex buffer.
 620  */
 621 void
 622 st_flush_bitmap( struct st_context *st )
 623 {
 624    st_flush_bitmap_cache(st);
 625
 626    /* Release vertex buffer to avoid synchronous rendering if we were
 627     * to map it in the next frame.
 628     */
 629    pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 630    st->bitmap.vbuf_slot = 0;
 631 }
 632
 633
 634 /**
 635  * Try to accumulate this glBitmap call in the bitmap cache.
 636  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 637  */
 638 static GLboolean
 639 accum_bitmap(struct st_context *st,
 640              GLint x, GLint y, GLsizei width, GLsizei height,
 641              const struct gl_pixelstore_attrib *unpack,
 642              const GLubyte *bitmap )
 643 {
 644    struct bitmap_cache *cache = st->bitmap.cache;
 645    int px = -999, py;
 646    const GLfloat z = st->ctx->Current.RasterPos[2];
 647
 648    if (width > BITMAP_CACHE_WIDTH ||
 649        height > BITMAP_CACHE_HEIGHT)
 650       return GL_FALSE; /* too big to cache */
 651
 652    if (!cache->empty) {
 653       px = x - cache->xpos;  /* pos in buffer */
 654       py = y - cache->ypos;
 655       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 656           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 657           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 658           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 659          /* This bitmap would extend beyond cache bounds, or the bitmap
 660           * color is changing
 661           * so flush and continue.
 662           */
 663          st_flush_bitmap_cache(st);
 664       }
 665    }
 666
 667    if (cache->empty) {
 668       /* Initialize.  Center bitmap vertically in the buffer. */
 669       px = 0;
 670       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 671       cache->xpos = x;
 672       cache->ypos = y - py;
 673       cache->zpos = z;
 674       cache->empty = GL_FALSE;
 675       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 676    }
 677
 678    assert(px != -999);
 679
 680    if (x < cache->xmin)
 681       cache->xmin = x;
 682    if (y < cache->ymin)
 683       cache->ymin = y;
 684    if (x + width > cache->xmax)
 685       cache->xmax = x + width;
 686    if (y + height > cache->ymax)
 687       cache->ymax = y + height;
 688
 689    /* create the transfer if needed */
 690    create_cache_trans(st);
 691
 692    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 693                  cache->buffer, BITMAP_CACHE_WIDTH);
 694
 695    return GL_TRUE; /* accumulated */
 696 }
 697
 698
 699
 700 /**
 701  * Called via ctx->Driver.Bitmap()
 702  */
 703 static void
 704 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 705           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 706 {
 707    struct st_context *st = ctx->st;
 708    struct pipe_texture *pt;
 709
 710    if (width == 0 || height == 0)
 711       return;
 712
 713    st_validate_state(st);
 714
 715    if (!st->bitmap.vs) {
 716       /* create pass-through vertex shader now */
 717       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 718                                       TGSI_SEMANTIC_COLOR,
 719                                       TGSI_SEMANTIC_GENERIC };
 720       const uint semantic_indexes[] = { 0, 0, 0 };
 721       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 722                                                           semantic_names,
 723                                                           semantic_indexes);
 724    }
 725
 726    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 727       return;
 728
 729    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 730    if (pt) {
 731       assert(pt->target == PIPE_TEXTURE_2D);
 732       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 733                        width, height, pt,
 734                        st->ctx->Current.RasterColor);
 735       /* release/free the texture */
 736       pipe_texture_reference(&pt, NULL);
 737    }
 738 }
 739
 740
 741 /** Per-context init */
 742 void
 743 st_init_bitmap_functions(struct dd_function_table *functions)
 744 {
 745    functions->Bitmap = st_Bitmap;
 746 }
 747
 748
 749 /** Per-context init */
 750 void
 751 st_init_bitmap(struct st_context *st)
 752 {
 753    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 754    struct pipe_context *pipe = st->pipe;
 755    struct pipe_screen *screen = pipe->screen;
 756
 757    /* init sampler state once */
 758    memset(sampler, 0, sizeof(*sampler));
 759    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 760    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 761    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 762    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 763    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 764    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 765    sampler->normalized_coords = 1;
 766
 767    /* init baseline rasterizer state once */
 768    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 769    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 770
 771    /* find a usable texture format */
 772    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D,
 773                                    PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 774       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 775    }
 776    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM, PIPE_TEXTURE_2D,
 777                                         PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 778       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 779    }
 780    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, PIPE_TEXTURE_2D,
 781                                         PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 782       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 783    }
 784    else {
 785       /* XXX support more formats */
 786       assert(0);
 787    }
 788
 789    /* alloc bitmap cache object */
 790    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 791
 792    reset_cache(st);
 793 }
 794
 795
 796 /** Per-context tear-down */
 797 void
 798 st_destroy_bitmap(struct st_context *st)
 799 {
 800    struct pipe_context *pipe = st->pipe;
 801    struct pipe_screen *screen = pipe->screen;
 802    struct bitmap_cache *cache = st->bitmap.cache;
 803
 804
 805
 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_buffer_reference(&st->bitmap.vbuf, NULL);
 813       st->bitmap.vbuf = NULL;
 814    }
 815
 816    if (cache) {
 817       if (cache->trans) {
 818          screen->transfer_unmap(screen, cache->trans);
 819          screen->tex_transfer_destroy(cache->trans);
 820       }
 821       pipe_texture_reference(&st->bitmap.cache->texture, NULL);
 822       _mesa_free(st->bitmap.cache);
 823       st->bitmap.cache = NULL;
 824    }
 825 }