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 "shader/program.h"
  38 #include "shader/prog_print.h"
  39
  40 #include "st_context.h"
  41 #include "st_atom.h"
  42 #include "st_atom_constbuf.h"
  43 #include "st_program.h"
  44 #include "st_cb_bitmap.h"
  45 #include "st_texture.h"
  46 #include "st_inlines.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_defines.h"
  50 #include "util/u_inlines.h"
  51 #include "util/u_draw_quad.h"
  52 #include "util/u_simple_shaders.h"
  53 #include "shader/prog_instruction.h"
  54 #include "cso_cache/cso_context.h"
  55
  56
  57
  58 /**
  59  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  60  * is stored in a texture image.  An alpha8 texture format is used.
  61  * The fragment shader samples a bit (texel) from the texture, then
  62  * discards the fragment if the bit is off.
  63  *
  64  * Note that we actually store the inverse image of the bitmap to
  65  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  66  * and an "off" bit is stored as texel=0xff.  Then we kill the
  67  * fragment if the negated texel value is less than zero.
  68  */
  69
  70
  71 /**
  72  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  73  * buffer which is then rendered en mass upon a flush, state change, etc.
  74  * A wide, short buffer is used to target the common case of a series
  75  * of glBitmap calls being used to draw text.
  76  */
  77 static GLboolean UseBitmapCache = GL_TRUE;
  78
  79
  80 #define BITMAP_CACHE_WIDTH  512
  81 #define BITMAP_CACHE_HEIGHT 32
  82
  83 struct bitmap_cache
  84 {
  85    /** Window pos to render the cached image */
  86    GLint xpos, ypos;
  87    /** Bounds of region used in window coords */
  88    GLint xmin, ymin, xmax, ymax;
  89
  90    GLfloat color[4];
  91
  92    /** Bitmap's Z position */
  93    GLfloat zpos;
  94
  95    struct pipe_texture *texture;
  96    struct pipe_transfer *trans;
  97
  98    GLboolean empty;
  99
 100    /** An I8 texture image: */
 101    ubyte *buffer;
 102 };
 103
 104
 105 /** Epsilon for Z comparisons */
 106 #define Z_EPSILON 1e-06
 107
 108
 109 /**
 110  * Make fragment program for glBitmap:
 111  *   Sample the texture and kill the fragment if the bit is 0.
 112  * This program will be combined with the user's fragment program.
 113  */
 114 static struct st_fragment_program *
 115 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 116 {
 117    struct st_fragment_program *stfp;
 118    struct gl_program *p;
 119    GLuint ic = 0;
 120
 121    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 122    if (!p)
 123       return NULL;
 124
 125    p->NumInstructions = 3;
 126
 127    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 128    if (!p->Instructions) {
 129       ctx->Driver.DeleteProgram(ctx, p);
 130       return NULL;
 131    }
 132    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 133
 134    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 135    p->Instructions[ic].Opcode = OPCODE_TEX;
 136    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 137    p->Instructions[ic].DstReg.Index = 0;
 138    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 139    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 140    p->Instructions[ic].TexSrcUnit = samplerIndex;
 141    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 142    ic++;
 143
 144    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 145    p->Instructions[ic].Opcode = OPCODE_KIL;
 146    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 147
 148    if (ctx->st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 149       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 150
 151    p->Instructions[ic].SrcReg[0].Index = 0;
 152    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 153    ic++;
 154
 155    /* END; */
 156    p->Instructions[ic++].Opcode = OPCODE_END;
 157
 158    assert(ic == p->NumInstructions);
 159
 160    p->InputsRead = FRAG_BIT_TEX0;
 161    p->OutputsWritten = 0x0;
 162    p->SamplersUsed = (1 << samplerIndex);
 163
 164    stfp = (struct st_fragment_program *) p;
 165    stfp->Base.UsesKill = GL_TRUE;
 166
 167    return stfp;
 168 }
 169
 170
 171 static int
 172 find_free_bit(uint bitfield)
 173 {
 174    int i;
 175    for (i = 0; i < 32; i++) {
 176       if ((bitfield & (1 << i)) == 0) {
 177          return i;
 178       }
 179    }
 180    return -1;
 181 }
 182
 183
 184 /**
 185  * Combine basic bitmap fragment program with the user-defined program.
 186  */
 187 static struct st_fragment_program *
 188 combined_bitmap_fragment_program(GLcontext *ctx)
 189 {
 190    struct st_context *st = ctx->st;
 191    struct st_fragment_program *stfp = st->fp;
 192
 193    if (!stfp->bitmap_program) {
 194       /*
 195        * Generate new program which is the user-defined program prefixed
 196        * with the bitmap sampler/kill instructions.
 197        */
 198       struct st_fragment_program *bitmap_prog;
 199       uint sampler;
 200
 201       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 202       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 203
 204       stfp->bitmap_program = (struct st_fragment_program *)
 205          _mesa_combine_programs(ctx,
 206                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 207       stfp->bitmap_program->bitmap_sampler = sampler;
 208
 209       /* done with this after combining */
 210       st_reference_fragprog(st, &bitmap_prog, NULL);
 211
 212 #if 0
 213       {
 214          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 215          printf("Combined bitmap program:\n");
 216          _mesa_print_program(p);
 217          printf("InputsRead: 0x%x\n", p->InputsRead);
 218          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 219          _mesa_print_parameter_list(p->Parameters);
 220       }
 221 #endif
 222
 223       /* translate to TGSI tokens */
 224       st_translate_fragment_program(st, stfp->bitmap_program);
 225    }
 226
 227    return stfp->bitmap_program;
 228 }
 229
 230
 231 /**
 232  * Copy user-provide bitmap bits into texture buffer, expanding
 233  * bits into texels.
 234  * "On" bits will set texels to 0x0.
 235  * "Off" bits will not modify texels.
 236  * Note that the image is actually going to be upside down in
 237  * the texture.  We deal with that with texcoords.
 238  */
 239 static void
 240 unpack_bitmap(struct st_context *st,
 241               GLint px, GLint py, GLsizei width, GLsizei height,
 242               const struct gl_pixelstore_attrib *unpack,
 243               const GLubyte *bitmap,
 244               ubyte *destBuffer, uint destStride)
 245 {
 246    destBuffer += py * destStride + px;
 247
 248    _mesa_expand_bitmap(width, height, unpack, bitmap,
 249                        destBuffer, destStride, 0x0);
 250 }
 251
 252
 253 /**
 254  * Create a texture which represents a bitmap image.
 255  */
 256 static struct pipe_texture *
 257 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 258                     const struct gl_pixelstore_attrib *unpack,
 259                     const GLubyte *bitmap)
 260 {
 261    struct pipe_context *pipe = ctx->st->pipe;
 262    struct pipe_screen *screen = pipe->screen;
 263    struct pipe_transfer *transfer;
 264    ubyte *dest;
 265    struct pipe_texture *pt;
 266
 267    /* PBO source... */
 268    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 269    if (!bitmap) {
 270       return NULL;
 271    }
 272
 273    /**
 274     * Create texture to hold bitmap pattern.
 275     */
 276    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 277                           0, width, height, 1,
 278                           PIPE_TEXTURE_USAGE_SAMPLER);
 279    if (!pt) {
 280       _mesa_unmap_pbo_source(ctx, unpack);
 281       return NULL;
 282    }
 283
 284    transfer = st_no_flush_get_tex_transfer(st_context(ctx), pt, 0, 0, 0,
 285                                            PIPE_TRANSFER_WRITE,
 286                                            0, 0, width, height);
 287
 288    dest = screen->transfer_map(screen, transfer);
 289
 290    /* Put image into texture transfer */
 291    memset(dest, 0xff, height * transfer->stride);
 292    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 293                  dest, transfer->stride);
 294
 295    _mesa_unmap_pbo_source(ctx, unpack);
 296
 297    /* Release transfer */
 298    screen->transfer_unmap(screen, transfer);
 299    screen->tex_transfer_destroy(transfer);
 300
 301    return pt;
 302 }
 303
 304 static GLuint
 305 setup_bitmap_vertex_data(struct st_context *st,
 306                          int x, int y, int width, int height,
 307                          float z, const float color[4])
 308 {
 309    struct pipe_context *pipe = st->pipe;
 310    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 311    const GLfloat fb_width = (GLfloat)fb->Width;
 312    const GLfloat fb_height = (GLfloat)fb->Height;
 313    const GLfloat x0 = (GLfloat)x;
 314    const GLfloat x1 = (GLfloat)(x + width);
 315    const GLfloat y0 = (GLfloat)y;
 316    const GLfloat y1 = (GLfloat)(y + height);
 317    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 318    const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 319    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 320    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 321    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 322    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 323
 324    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 325     * no_flush) updates to buffers where we know there is no conflict
 326     * with previous data.  Currently using max_slots > 1 will cause
 327     * synchronous rendering if the driver flushes its command buffers
 328     * between one bitmap and the next.  Our flush hook below isn't
 329     * sufficient to catch this as the driver doesn't tell us when it
 330     * flushes its own command buffers.  Until this gets fixed, pay the
 331     * price of allocating a new buffer for each bitmap cache-flush to
 332     * avoid synchronous rendering.
 333     */
 334    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 335    GLuint i;
 336
 337    if (st->bitmap.vbuf_slot >= max_slots) {
 338       pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 339       st->bitmap.vbuf_slot = 0;
 340    }
 341
 342    if (!st->bitmap.vbuf) {
 343       st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32,
 344                                            PIPE_BUFFER_USAGE_VERTEX,
 345                                            max_slots * sizeof(st->bitmap.vertices));
 346    }
 347
 348    /* Positions are in clip coords since we need to do clipping in case
 349     * the bitmap quad goes beyond the window bounds.
 350     */
 351    st->bitmap.vertices[0][0][0] = clip_x0;
 352    st->bitmap.vertices[0][0][1] = clip_y0;
 353    st->bitmap.vertices[0][2][0] = sLeft;
 354    st->bitmap.vertices[0][2][1] = tTop;
 355
 356    st->bitmap.vertices[1][0][0] = clip_x1;
 357    st->bitmap.vertices[1][0][1] = clip_y0;
 358    st->bitmap.vertices[1][2][0] = sRight;
 359    st->bitmap.vertices[1][2][1] = tTop;
 360
 361    st->bitmap.vertices[2][0][0] = clip_x1;
 362    st->bitmap.vertices[2][0][1] = clip_y1;
 363    st->bitmap.vertices[2][2][0] = sRight;
 364    st->bitmap.vertices[2][2][1] = tBot;
 365
 366    st->bitmap.vertices[3][0][0] = clip_x0;
 367    st->bitmap.vertices[3][0][1] = clip_y1;
 368    st->bitmap.vertices[3][2][0] = sLeft;
 369    st->bitmap.vertices[3][2][1] = tBot;
 370
 371    /* same for all verts: */
 372    for (i = 0; i < 4; i++) {
 373       st->bitmap.vertices[i][0][2] = z;
 374       st->bitmap.vertices[i][0][3] = 1.0;
 375       st->bitmap.vertices[i][1][0] = color[0];
 376       st->bitmap.vertices[i][1][1] = color[1];
 377       st->bitmap.vertices[i][1][2] = color[2];
 378       st->bitmap.vertices[i][1][3] = color[3];
 379       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 380       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 381    }
 382
 383    /* put vertex data into vbuf */
 384    st_no_flush_pipe_buffer_write_nooverlap(st,
 385                                            st->bitmap.vbuf,
 386                                            st->bitmap.vbuf_slot * sizeof st->bitmap.vertices,
 387                                            sizeof st->bitmap.vertices,
 388                                            st->bitmap.vertices);
 389
 390    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 391 }
 392
 393
 394
 395 /**
 396  * Render a glBitmap by drawing a textured quad
 397  */
 398 static void
 399 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 400                  GLsizei width, GLsizei height,
 401                  struct pipe_texture *pt,
 402                  const GLfloat *color)
 403 {
 404    struct st_context *st = ctx->st;
 405    struct pipe_context *pipe = ctx->st->pipe;
 406    struct cso_context *cso = ctx->st->cso_context;
 407    struct st_fragment_program *stfp;
 408    GLuint maxSize;
 409    GLuint offset;
 410
 411    stfp = combined_bitmap_fragment_program(ctx);
 412
 413    /* As an optimization, Mesa's fragment programs will sometimes get the
 414     * primary color from a statevar/constant rather than a varying variable.
 415     * when that's the case, we need to ensure that we use the 'color'
 416     * parameter and not the current attribute color (which may have changed
 417     * through glRasterPos and state validation.
 418     * So, we force the proper color here.  Not elegant, but it works.
 419     */
 420    {
 421       GLfloat colorSave[4];
 422       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 423       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 424       st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 425       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 426    }
 427
 428
 429    /* limit checks */
 430    /* XXX if the bitmap is larger than the max texture size, break
 431     * it up into chunks.
 432     */
 433    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 434    assert(width <= (GLsizei)maxSize);
 435    assert(height <= (GLsizei)maxSize);
 436
 437    cso_save_rasterizer(cso);
 438    cso_save_samplers(cso);
 439    cso_save_sampler_textures(cso);
 440    cso_save_viewport(cso);
 441    cso_save_fragment_shader(cso);
 442    cso_save_vertex_shader(cso);
 443    cso_save_vertex_elements(cso);
 444
 445    /* rasterizer state: just scissor */
 446    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 447    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 448
 449    /* fragment shader state: TEX lookup program */
 450    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 451
 452    /* vertex shader state: position + texcoord pass-through */
 453    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 454
 455    /* user samplers, plus our bitmap sampler */
 456    {
 457       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 458       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 459       uint i;
 460       for (i = 0; i < st->state.num_samplers; i++) {
 461          samplers[i] = &st->state.samplers[i];
 462       }
 463       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 464       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 465    }
 466
 467    /* user textures, plus the bitmap texture */
 468    {
 469       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 470       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 471       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 472       textures[stfp->bitmap_sampler] = pt;
 473       cso_set_sampler_textures(cso, num, textures);
 474    }
 475
 476    /* viewport state: viewport matching window dims */
 477    {
 478       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 479       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 480       const GLfloat width = (GLfloat)fb->Width;
 481       const GLfloat height = (GLfloat)fb->Height;
 482       struct pipe_viewport_state vp;
 483       vp.scale[0] =  0.5f * width;
 484       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 485       vp.scale[2] = 0.5f;
 486       vp.scale[3] = 1.0f;
 487       vp.translate[0] = 0.5f * width;
 488       vp.translate[1] = 0.5f * height;
 489       vp.translate[2] = 0.5f;
 490       vp.translate[3] = 0.0f;
 491       cso_set_viewport(cso, &vp);
 492    }
 493
 494    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 495
 496    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 497    z = z * 2.0 - 1.0;
 498
 499    /* draw textured quad */
 500    offset = setup_bitmap_vertex_data(st, x, y, width, height, z, color);
 501
 502    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 503                            PIPE_PRIM_TRIANGLE_FAN,
 504                            4,  /* verts */
 505                            3); /* attribs/vert */
 506
 507
 508    /* restore state */
 509    cso_restore_rasterizer(cso);
 510    cso_restore_samplers(cso);
 511    cso_restore_sampler_textures(cso);
 512    cso_restore_viewport(cso);
 513    cso_restore_fragment_shader(cso);
 514    cso_restore_vertex_shader(cso);
 515    cso_restore_vertex_elements(cso);
 516 }
 517
 518
 519 static void
 520 reset_cache(struct st_context *st)
 521 {
 522    struct pipe_context *pipe = st->pipe;
 523    struct pipe_screen *screen = pipe->screen;
 524    struct bitmap_cache *cache = st->bitmap.cache;
 525
 526    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 527    cache->empty = GL_TRUE;
 528
 529    cache->xmin = 1000000;
 530    cache->xmax = -1000000;
 531    cache->ymin = 1000000;
 532    cache->ymax = -1000000;
 533
 534    if (cache->trans) {
 535       screen->tex_transfer_destroy(cache->trans);
 536       cache->trans = NULL;
 537    }
 538
 539    assert(!cache->texture);
 540
 541    /* allocate a new texture */
 542    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 543                                       st->bitmap.tex_format, 0,
 544                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 545                                       1, PIPE_TEXTURE_USAGE_SAMPLER);
 546 }
 547
 548
 549 /** Print bitmap image to stdout (debug) */
 550 static void
 551 print_cache(const struct bitmap_cache *cache)
 552 {
 553    int i, j, k;
 554
 555    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 556       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 557       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 558          if (cache->buffer[k])
 559             printf("X");
 560          else
 561             printf(" ");
 562          k++;
 563       }
 564       printf("\n");
 565    }
 566 }
 567
 568
 569 static void
 570 create_cache_trans(struct st_context *st)
 571 {
 572    struct pipe_context *pipe = st->pipe;
 573    struct pipe_screen *screen = pipe->screen;
 574    struct bitmap_cache *cache = st->bitmap.cache;
 575
 576    if (cache->trans)
 577       return;
 578
 579    /* Map the texture transfer.
 580     * Subsequent glBitmap calls will write into the texture image.
 581     */
 582    cache->trans = st_no_flush_get_tex_transfer(st, cache->texture, 0, 0, 0,
 583                                                PIPE_TRANSFER_WRITE, 0, 0,
 584                                                BITMAP_CACHE_WIDTH,
 585                                                BITMAP_CACHE_HEIGHT);
 586    cache->buffer = screen->transfer_map(screen, cache->trans);
 587
 588    /* init image to all 0xff */
 589    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 590 }
 591
 592
 593 /**
 594  * If there's anything in the bitmap cache, draw/flush it now.
 595  */
 596 void
 597 st_flush_bitmap_cache(struct st_context *st)
 598 {
 599    if (!st->bitmap.cache->empty) {
 600       struct bitmap_cache *cache = st->bitmap.cache;
 601
 602       if (st->ctx->DrawBuffer) {
 603          struct pipe_context *pipe = st->pipe;
 604          struct pipe_screen *screen = pipe->screen;
 605
 606          assert(cache->xmin <= cache->xmax);
 607
 608 /*         printf("flush size %d x %d  at %d, %d\n",
 609                 cache->xmax - cache->xmin,
 610                 cache->ymax - cache->ymin,
 611                 cache->xpos, cache->ypos);
 612 */
 613
 614          /* The texture transfer has been mapped until now.
 615           * So unmap and release the texture transfer before drawing.
 616           */
 617          if (cache->trans) {
 618             if (0)
 619                print_cache(cache);
 620             screen->transfer_unmap(screen, cache->trans);
 621             cache->buffer = NULL;
 622
 623             screen->tex_transfer_destroy(cache->trans);
 624             cache->trans = NULL;
 625          }
 626
 627          draw_bitmap_quad(st->ctx,
 628                           cache->xpos,
 629                           cache->ypos,
 630                           cache->zpos,
 631                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 632                           cache->texture,
 633                           cache->color);
 634       }
 635
 636       /* release/free the texture */
 637       pipe_texture_reference(&cache->texture, NULL);
 638
 639       reset_cache(st);
 640    }
 641 }
 642
 643 /* Flush bitmap cache and release vertex buffer.
 644  */
 645 void
 646 st_flush_bitmap( struct st_context *st )
 647 {
 648    st_flush_bitmap_cache(st);
 649
 650    /* Release vertex buffer to avoid synchronous rendering if we were
 651     * to map it in the next frame.
 652     */
 653    pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 654    st->bitmap.vbuf_slot = 0;
 655 }
 656
 657
 658 /**
 659  * Try to accumulate this glBitmap call in the bitmap cache.
 660  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 661  */
 662 static GLboolean
 663 accum_bitmap(struct st_context *st,
 664              GLint x, GLint y, GLsizei width, GLsizei height,
 665              const struct gl_pixelstore_attrib *unpack,
 666              const GLubyte *bitmap )
 667 {
 668    struct bitmap_cache *cache = st->bitmap.cache;
 669    int px = -999, py = -999;
 670    const GLfloat z = st->ctx->Current.RasterPos[2];
 671
 672    if (width > BITMAP_CACHE_WIDTH ||
 673        height > BITMAP_CACHE_HEIGHT)
 674       return GL_FALSE; /* too big to cache */
 675
 676    if (!cache->empty) {
 677       px = x - cache->xpos;  /* pos in buffer */
 678       py = y - cache->ypos;
 679       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 680           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 681           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 682           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 683          /* This bitmap would extend beyond cache bounds, or the bitmap
 684           * color is changing
 685           * so flush and continue.
 686           */
 687          st_flush_bitmap_cache(st);
 688       }
 689    }
 690
 691    if (cache->empty) {
 692       /* Initialize.  Center bitmap vertically in the buffer. */
 693       px = 0;
 694       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 695       cache->xpos = x;
 696       cache->ypos = y - py;
 697       cache->zpos = z;
 698       cache->empty = GL_FALSE;
 699       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 700    }
 701
 702    assert(px != -999);
 703    assert(py != -999);
 704
 705    if (x < cache->xmin)
 706       cache->xmin = x;
 707    if (y < cache->ymin)
 708       cache->ymin = y;
 709    if (x + width > cache->xmax)
 710       cache->xmax = x + width;
 711    if (y + height > cache->ymax)
 712       cache->ymax = y + height;
 713
 714    /* create the transfer if needed */
 715    create_cache_trans(st);
 716
 717    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 718                  cache->buffer, BITMAP_CACHE_WIDTH);
 719
 720    return GL_TRUE; /* accumulated */
 721 }
 722
 723
 724
 725 /**
 726  * Called via ctx->Driver.Bitmap()
 727  */
 728 static void
 729 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 730           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 731 {
 732    struct st_context *st = ctx->st;
 733    struct pipe_texture *pt;
 734
 735    if (width == 0 || height == 0)
 736       return;
 737
 738    st_validate_state(st);
 739
 740    if (!st->bitmap.vs) {
 741       /* create pass-through vertex shader now */
 742       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 743                                       TGSI_SEMANTIC_COLOR,
 744                                       TGSI_SEMANTIC_GENERIC };
 745       const uint semantic_indexes[] = { 0, 0, 0 };
 746       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 747                                                           semantic_names,
 748                                                           semantic_indexes);
 749    }
 750
 751    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 752       return;
 753
 754    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 755    if (pt) {
 756       assert(pt->target == PIPE_TEXTURE_2D);
 757       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 758                        width, height, pt,
 759                        st->ctx->Current.RasterColor);
 760       /* release/free the texture */
 761       pipe_texture_reference(&pt, NULL);
 762    }
 763 }
 764
 765
 766 /** Per-context init */
 767 void
 768 st_init_bitmap_functions(struct dd_function_table *functions)
 769 {
 770    functions->Bitmap = st_Bitmap;
 771 }
 772
 773
 774 /** Per-context init */
 775 void
 776 st_init_bitmap(struct st_context *st)
 777 {
 778    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 779    struct pipe_context *pipe = st->pipe;
 780    struct pipe_screen *screen = pipe->screen;
 781
 782    /* init sampler state once */
 783    memset(sampler, 0, sizeof(*sampler));
 784    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 785    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 786    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 787    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 788    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 789    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 790    sampler->normalized_coords = 1;
 791
 792    /* init baseline rasterizer state once */
 793    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 794    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 795
 796    /* find a usable texture format */
 797    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D,
 798                                    PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 799       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 800    }
 801    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM, PIPE_TEXTURE_2D,
 802                                         PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 803       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 804    }
 805    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, PIPE_TEXTURE_2D,
 806                                         PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 807       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 808    }
 809    else {
 810       /* XXX support more formats */
 811       assert(0);
 812    }
 813
 814    /* alloc bitmap cache object */
 815    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 816
 817    reset_cache(st);
 818 }
 819
 820
 821 /** Per-context tear-down */
 822 void
 823 st_destroy_bitmap(struct st_context *st)
 824 {
 825    struct pipe_context *pipe = st->pipe;
 826    struct pipe_screen *screen = pipe->screen;
 827    struct bitmap_cache *cache = st->bitmap.cache;
 828
 829
 830
 831    if (st->bitmap.vs) {
 832       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 833       st->bitmap.vs = NULL;
 834    }
 835
 836    if (st->bitmap.vbuf) {
 837       pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 838       st->bitmap.vbuf = NULL;
 839    }
 840
 841    if (cache) {
 842       if (cache->trans) {
 843          screen->transfer_unmap(screen, cache->trans);
 844          screen->tex_transfer_destroy(cache->trans);
 845       }
 846       pipe_texture_reference(&st->bitmap.cache->texture, NULL);
 847       free(st->bitmap.cache);
 848       st->bitmap.cache = NULL;
 849    }
 850 }