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/u_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    GLfloat color[4];
  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
 106
 107 /**
 108  * Make fragment program for glBitmap:
 109  *   Sample the texture and kill the fragment if the bit is 0.
 110  * This program will be combined with the user's fragment program.
 111  */
 112 static struct st_fragment_program *
 113 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 114 {
 115    struct st_fragment_program *stfp;
 116    struct gl_program *p;
 117    GLuint ic = 0;
 118
 119    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 120    if (!p)
 121       return NULL;
 122
 123    p->NumInstructions = 3;
 124
 125    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 126    if (!p->Instructions) {
 127       ctx->Driver.DeleteProgram(ctx, p);
 128       return NULL;
 129    }
 130    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 131
 132    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 133    p->Instructions[ic].Opcode = OPCODE_TEX;
 134    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 135    p->Instructions[ic].DstReg.Index = 0;
 136    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 137    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 138    p->Instructions[ic].TexSrcUnit = samplerIndex;
 139    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 140    ic++;
 141
 142    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 143    p->Instructions[ic].Opcode = OPCODE_KIL;
 144    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 145    p->Instructions[ic].SrcReg[0].Index = 0;
 146    p->Instructions[ic].SrcReg[0].NegateBase = NEGATE_XYZW;
 147    ic++;
 148
 149    /* END; */
 150    p->Instructions[ic++].Opcode = OPCODE_END;
 151
 152    assert(ic == p->NumInstructions);
 153
 154    p->InputsRead = FRAG_BIT_TEX0;
 155    p->OutputsWritten = 0x0;
 156    p->SamplersUsed = (1 << samplerIndex);
 157
 158    stfp = (struct st_fragment_program *) p;
 159    stfp->Base.UsesKill = GL_TRUE;
 160    st_translate_fragment_program(ctx->st, stfp, NULL);
 161
 162    return stfp;
 163 }
 164
 165
 166 static int
 167 find_free_bit(uint bitfield)
 168 {
 169    int i;
 170    for (i = 0; i < 32; i++) {
 171       if ((bitfield & (1 << i)) == 0) {
 172          return i;
 173       }
 174    }
 175    return -1;
 176 }
 177
 178
 179 /**
 180  * Combine basic bitmap fragment program with the user-defined program.
 181  */
 182 static struct st_fragment_program *
 183 combined_bitmap_fragment_program(GLcontext *ctx)
 184 {
 185    struct st_context *st = ctx->st;
 186    struct st_fragment_program *stfp = st->fp;
 187
 188    if (!stfp->bitmap_program) {
 189       /*
 190        * Generate new program which is the user-defined program prefixed
 191        * with the bitmap sampler/kill instructions.
 192        */
 193       struct st_fragment_program *bitmap_prog;
 194       uint sampler;
 195
 196       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 197       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 198
 199       stfp->bitmap_program = (struct st_fragment_program *)
 200          _mesa_combine_programs(ctx,
 201                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 202       stfp->bitmap_program->bitmap_sampler = sampler;
 203
 204       /* done with this after combining */
 205       st_reference_fragprog(st, &bitmap_prog, NULL);
 206
 207 #if 0
 208       {
 209          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 210          printf("Combined bitmap program:\n");
 211          _mesa_print_program(p);
 212          printf("InputsRead: 0x%x\n", p->InputsRead);
 213          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 214          _mesa_print_parameter_list(p->Parameters);
 215       }
 216 #endif
 217
 218       /* translate to TGSI tokens */
 219       st_translate_fragment_program(st, stfp->bitmap_program, NULL);
 220    }
 221
 222    return stfp->bitmap_program;
 223 }
 224
 225
 226 /**
 227  * Copy user-provide bitmap bits into texture buffer, expanding
 228  * bits into texels.
 229  * "On" bits will set texels to 0xff.
 230  * "Off" bits will not modify texels.
 231  * Note that the image is actually going to be upside down in
 232  * the texture.  We deal with that with texcoords.
 233  */
 234 static void
 235 unpack_bitmap(struct st_context *st,
 236               GLint px, GLint py, GLsizei width, GLsizei height,
 237               const struct gl_pixelstore_attrib *unpack,
 238               const GLubyte *bitmap,
 239               ubyte *destBuffer, uint destStride)
 240 {
 241    GLint row, col;
 242
 243 #define SET_PIXEL(COL, ROW) \
 244    destBuffer[(py + (ROW)) * destStride + px + (COL)] = 0x0;
 245
 246    for (row = 0; row < height; row++) {
 247       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 248                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 249
 250       if (unpack->LsbFirst) {
 251          /* Lsb first */
 252          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 253          for (col = 0; col < width; col++) {
 254
 255             if (*src & mask) {
 256                SET_PIXEL(col, row);
 257             }
 258
 259             if (mask == 128U) {
 260                src++;
 261                mask = 1U;
 262             }
 263             else {
 264                mask = mask << 1;
 265             }
 266          }
 267
 268          /* get ready for next row */
 269          if (mask != 1)
 270             src++;
 271       }
 272       else {
 273          /* Msb first */
 274          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 275          for (col = 0; col < width; col++) {
 276
 277             if (*src & mask) {
 278                SET_PIXEL(col, row);
 279             }
 280
 281             if (mask == 1U) {
 282                src++;
 283                mask = 128U;
 284             }
 285             else {
 286                mask = mask >> 1;
 287             }
 288          }
 289
 290          /* get ready for next row */
 291          if (mask != 128)
 292             src++;
 293       }
 294
 295    } /* row */
 296
 297 #undef SET_PIXEL
 298 }
 299
 300
 301 /**
 302  * Create a texture which represents a bitmap image.
 303  */
 304 static struct pipe_texture *
 305 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 306                     const struct gl_pixelstore_attrib *unpack,
 307                     const GLubyte *bitmap)
 308 {
 309    struct pipe_context *pipe = ctx->st->pipe;
 310    struct pipe_screen *screen = pipe->screen;
 311    struct pipe_transfer *transfer;
 312    ubyte *dest;
 313    struct pipe_texture *pt;
 314
 315    /* PBO source... */
 316    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 317    if (!bitmap) {
 318       return NULL;
 319    }
 320
 321    /**
 322     * Create texture to hold bitmap pattern.
 323     */
 324    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 325                           0, width, height, 1, 0,
 326                           PIPE_TEXTURE_USAGE_SAMPLER);
 327    if (!pt) {
 328       _mesa_unmap_bitmap_pbo(ctx, unpack);
 329       return NULL;
 330    }
 331
 332    transfer = screen->get_tex_transfer(screen, pt, 0, 0, 0, PIPE_TRANSFER_WRITE,
 333                                        0, 0, width, height);
 334
 335    dest = screen->transfer_map(screen, transfer);
 336
 337    /* Put image into texture transfer */
 338    memset(dest, 0xff, height * transfer->stride);
 339    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 340                  dest, transfer->stride);
 341
 342    _mesa_unmap_bitmap_pbo(ctx, unpack);
 343
 344    /* Release transfer */
 345    screen->transfer_unmap(screen, transfer);
 346    screen->tex_transfer_release(screen, &transfer);
 347
 348    return pt;
 349 }
 350
 351 static GLuint
 352 setup_bitmap_vertex_data(struct st_context *st,
 353                          int x, int y, int width, int height,
 354                          float z, const float color[4])
 355 {
 356    struct pipe_context *pipe = st->pipe;
 357    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 358    const GLfloat fb_width = (GLfloat)fb->Width;
 359    const GLfloat fb_height = (GLfloat)fb->Height;
 360    const GLfloat x0 = (GLfloat)x;
 361    const GLfloat x1 = (GLfloat)(x + width);
 362    const GLfloat y0 = (GLfloat)y;
 363    const GLfloat y1 = (GLfloat)(y + height);
 364    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 365    const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 366    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 367    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 368    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 369    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 370    const GLuint max_slots = 4096 / sizeof(st->bitmap.vertices);
 371    GLuint i;
 372
 373    if (st->bitmap.vbuf_slot >= max_slots) {
 374       pipe_buffer_reference(pipe->screen, &st->bitmap.vbuf, NULL);
 375       st->bitmap.vbuf_slot = 0;
 376    }
 377
 378    if (!st->bitmap.vbuf) {
 379       st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32,
 380                                            PIPE_BUFFER_USAGE_VERTEX,
 381                                            max_slots * sizeof(st->bitmap.vertices));
 382    }
 383
 384    /* Positions are in clip coords since we need to do clipping in case
 385     * the bitmap quad goes beyond the window bounds.
 386     */
 387    st->bitmap.vertices[0][0][0] = clip_x0;
 388    st->bitmap.vertices[0][0][1] = clip_y0;
 389    st->bitmap.vertices[0][2][0] = sLeft;
 390    st->bitmap.vertices[0][2][1] = tTop;
 391
 392    st->bitmap.vertices[1][0][0] = clip_x1;
 393    st->bitmap.vertices[1][0][1] = clip_y0;
 394    st->bitmap.vertices[1][2][0] = sRight;
 395    st->bitmap.vertices[1][2][1] = tTop;
 396
 397    st->bitmap.vertices[2][0][0] = clip_x1;
 398    st->bitmap.vertices[2][0][1] = clip_y1;
 399    st->bitmap.vertices[2][2][0] = sRight;
 400    st->bitmap.vertices[2][2][1] = tBot;
 401
 402    st->bitmap.vertices[3][0][0] = clip_x0;
 403    st->bitmap.vertices[3][0][1] = clip_y1;
 404    st->bitmap.vertices[3][2][0] = sLeft;
 405    st->bitmap.vertices[3][2][1] = tBot;
 406
 407    /* same for all verts: */
 408    for (i = 0; i < 4; i++) {
 409       st->bitmap.vertices[i][0][2] = z;
 410       st->bitmap.vertices[i][0][3] = 1.0;
 411       st->bitmap.vertices[i][1][0] = color[0];
 412       st->bitmap.vertices[i][1][1] = color[1];
 413       st->bitmap.vertices[i][1][2] = color[2];
 414       st->bitmap.vertices[i][1][3] = color[3];
 415       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 416       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 417    }
 418
 419    /* put vertex data into vbuf */
 420    {
 421       char *buf = pipe_buffer_map(pipe->screen,
 422                                   st->bitmap.vbuf,
 423                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 424
 425       memcpy(buf + st->bitmap.vbuf_slot * sizeof st->bitmap.vertices,
 426              st->bitmap.vertices,
 427              sizeof st->bitmap.vertices);
 428
 429       pipe_buffer_unmap(pipe->screen, st->bitmap.vbuf);
 430    }
 431
 432    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 433 }
 434
 435
 436
 437 /**
 438  * Render a glBitmap by drawing a textured quad
 439  */
 440 static void
 441 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 442                  GLsizei width, GLsizei height,
 443                  struct pipe_texture *pt,
 444                  const GLfloat *color)
 445 {
 446    struct st_context *st = ctx->st;
 447    struct pipe_context *pipe = ctx->st->pipe;
 448    struct cso_context *cso = ctx->st->cso_context;
 449    struct st_fragment_program *stfp;
 450    GLuint maxSize;
 451    GLuint offset;
 452
 453    stfp = combined_bitmap_fragment_program(ctx);
 454
 455    /* As an optimization, Mesa's fragment programs will sometimes get the
 456     * primary color from a statevar/constant rather than a varying variable.
 457     * when that's the case, we need to ensure that we use the 'color'
 458     * parameter and not the current attribute color (which may have changed
 459     * through glRasterPos and state validation.
 460     * So, we force the proper color here.  Not elegant, but it works.
 461     */
 462    {
 463       GLfloat colorSave[4];
 464       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 465       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 466       st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 467       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 468    }
 469
 470
 471    /* limit checks */
 472    /* XXX if the bitmap is larger than the max texture size, break
 473     * it up into chunks.
 474     */
 475    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 476    assert(width <= (GLsizei)maxSize);
 477    assert(height <= (GLsizei)maxSize);
 478
 479    cso_save_rasterizer(cso);
 480    cso_save_samplers(cso);
 481    cso_save_sampler_textures(cso);
 482    cso_save_viewport(cso);
 483    cso_save_fragment_shader(cso);
 484    cso_save_vertex_shader(cso);
 485
 486    /* rasterizer state: just scissor */
 487    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 488    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 489
 490    /* fragment shader state: TEX lookup program */
 491    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 492
 493    /* vertex shader state: position + texcoord pass-through */
 494    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 495
 496    /* user samplers, plus our bitmap sampler */
 497    {
 498       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 499       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 500       uint i;
 501       for (i = 0; i < st->state.num_samplers; i++) {
 502          samplers[i] = &st->state.samplers[i];
 503       }
 504       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 505       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 506    }
 507
 508    /* user textures, plus the bitmap texture */
 509    {
 510       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 511       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 512       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 513       textures[stfp->bitmap_sampler] = pt;
 514       cso_set_sampler_textures(cso, num, textures);
 515    }
 516
 517    /* viewport state: viewport matching window dims */
 518    {
 519       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 520       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 521       const GLfloat width = (GLfloat)fb->Width;
 522       const GLfloat height = (GLfloat)fb->Height;
 523       struct pipe_viewport_state vp;
 524       vp.scale[0] =  0.5f * width;
 525       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 526       vp.scale[2] = 1.0f;
 527       vp.scale[3] = 1.0f;
 528       vp.translate[0] = 0.5f * width;
 529       vp.translate[1] = 0.5f * height;
 530       vp.translate[2] = 0.0f;
 531       vp.translate[3] = 0.0f;
 532       cso_set_viewport(cso, &vp);
 533    }
 534
 535    /* draw textured quad */
 536    offset = setup_bitmap_vertex_data(st, x, y, width, height,
 537                                      ctx->Current.RasterPos[2],
 538                                      color);
 539
 540    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 541                            PIPE_PRIM_TRIANGLE_FAN,
 542                            4,  /* verts */
 543                            3); /* attribs/vert */
 544
 545
 546    /* restore state */
 547    cso_restore_rasterizer(cso);
 548    cso_restore_samplers(cso);
 549    cso_restore_sampler_textures(cso);
 550    cso_restore_viewport(cso);
 551    cso_restore_fragment_shader(cso);
 552    cso_restore_vertex_shader(cso);
 553 }
 554
 555
 556 static void
 557 reset_cache(struct st_context *st)
 558 {
 559    struct pipe_context *pipe = st->pipe;
 560    struct pipe_screen *screen = pipe->screen;
 561    struct bitmap_cache *cache = st->bitmap.cache;
 562
 563    //memset(cache->buffer, 0xff, sizeof(cache->buffer));
 564    cache->empty = GL_TRUE;
 565
 566    cache->xmin = 1000000;
 567    cache->xmax = -1000000;
 568    cache->ymin = 1000000;
 569    cache->ymax = -1000000;
 570
 571    if (cache->trans)
 572       screen->tex_transfer_release(screen, &cache->trans);
 573
 574    assert(!cache->texture);
 575
 576    /* allocate a new texture */
 577    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 578                                       st->bitmap.tex_format, 0,
 579                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 580                                       1, 0,
 581                                       PIPE_TEXTURE_USAGE_SAMPLER);
 582
 583    /* Map the texture transfer.
 584     * Subsequent glBitmap calls will write into the texture image.
 585     */
 586    cache->trans = screen->get_tex_transfer(screen, cache->texture, 0, 0, 0,
 587                                            PIPE_TRANSFER_WRITE, 0, 0,
 588                                            BITMAP_CACHE_WIDTH,
 589                                            BITMAP_CACHE_HEIGHT);
 590    cache->buffer = screen->transfer_map(screen, cache->trans);
 591
 592    /* init image to all 0xff */
 593    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 594 }
 595
 596
 597 /**
 598  * If there's anything in the bitmap cache, draw/flush it now.
 599  */
 600 void
 601 st_flush_bitmap_cache(struct st_context *st)
 602 {
 603    if (!st->bitmap.cache->empty) {
 604       struct bitmap_cache *cache = st->bitmap.cache;
 605
 606       if (st->ctx->DrawBuffer) {
 607          struct pipe_context *pipe = st->pipe;
 608          struct pipe_screen *screen = pipe->screen;
 609
 610          assert(cache->xmin <= cache->xmax);
 611
 612 /*         printf("flush size %d x %d  at %d, %d\n",
 613                 cache->xmax - cache->xmin,
 614                 cache->ymax - cache->ymin,
 615                 cache->xpos, cache->ypos);
 616 */
 617
 618          /* The texture transfer has been mapped until now.
 619           * So unmap and release the texture transfer before drawing.
 620           */
 621          screen->transfer_unmap(screen, cache->trans);
 622          cache->buffer = NULL;
 623
 624          screen->tex_transfer_release(screen, &cache->trans);
 625
 626          draw_bitmap_quad(st->ctx,
 627                           cache->xpos,
 628                           cache->ypos,
 629                           st->ctx->Current.RasterPos[2],
 630                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 631                           cache->texture,
 632                           cache->color);
 633       }
 634
 635       /* release/free the texture */
 636       pipe_texture_reference(&cache->texture, NULL);
 637
 638       reset_cache(st);
 639    }
 640 }
 641
 642 /* Flush bitmap cache and release vertex buffer.
 643  */
 644 void
 645 st_flush_bitmap( struct st_context *st )
 646 {
 647    st_flush_bitmap_cache(st);
 648
 649    /* Release vertex buffer to avoid synchronous rendering if we were
 650     * to map it in the next frame.
 651     */
 652    pipe_buffer_reference(st->pipe->screen, &st->bitmap.vbuf, NULL);
 653    st->bitmap.vbuf_slot = 0;
 654 }
 655
 656
 657 /**
 658  * Try to accumulate this glBitmap call in the bitmap cache.
 659  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 660  */
 661 static GLboolean
 662 accum_bitmap(struct st_context *st,
 663              GLint x, GLint y, GLsizei width, GLsizei height,
 664              const struct gl_pixelstore_attrib *unpack,
 665              const GLubyte *bitmap )
 666 {
 667    struct bitmap_cache *cache = st->bitmap.cache;
 668    int px = -999, py;
 669
 670    if (width > BITMAP_CACHE_WIDTH ||
 671        height > BITMAP_CACHE_HEIGHT)
 672       return GL_FALSE; /* too big to cache */
 673
 674    if (!cache->empty) {
 675       px = x - cache->xpos;  /* pos in buffer */
 676       py = y - cache->ypos;
 677       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 678           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 679           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color)) {
 680          /* This bitmap would extend beyond cache bounds, or the bitmap
 681           * color is changing
 682           * so flush and continue.
 683           */
 684          st_flush_bitmap_cache(st);
 685       }
 686    }
 687
 688    if (cache->empty) {
 689       /* Initialize.  Center bitmap vertically in the buffer. */
 690       px = 0;
 691       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 692       cache->xpos = x;
 693       cache->ypos = y - py;
 694       cache->empty = GL_FALSE;
 695       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 696    }
 697
 698    assert(px != -999);
 699
 700    if (x < cache->xmin)
 701       cache->xmin = x;
 702    if (y < cache->ymin)
 703       cache->ymin = y;
 704    if (x + width > cache->xmax)
 705       cache->xmax = x + width;
 706    if (y + height > cache->ymax)
 707       cache->ymax = y + height;
 708
 709    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 710                  cache->buffer, BITMAP_CACHE_WIDTH);
 711
 712    return GL_TRUE; /* accumulated */
 713 }
 714
 715
 716
 717 /**
 718  * Called via ctx->Driver.Bitmap()
 719  */
 720 static void
 721 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 722           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 723 {
 724    struct st_context *st = ctx->st;
 725    struct pipe_texture *pt;
 726
 727    if (width == 0 || height == 0)
 728       return;
 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                        st->ctx->Current.RasterColor);
 753       /* release/free the texture */
 754       pipe_texture_reference(&pt, NULL);
 755    }
 756 }
 757
 758
 759 /** Per-context init */
 760 void
 761 st_init_bitmap_functions(struct dd_function_table *functions)
 762 {
 763    functions->Bitmap = st_Bitmap;
 764 }
 765
 766
 767 /** Per-context init */
 768 void
 769 st_init_bitmap(struct st_context *st)
 770 {
 771    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 772    struct pipe_context *pipe = st->pipe;
 773    struct pipe_screen *screen = pipe->screen;
 774
 775    /* init sampler state once */
 776    memset(sampler, 0, sizeof(*sampler));
 777    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 778    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 779    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 780    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 781    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 782    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 783    sampler->normalized_coords = 1;
 784
 785    /* init baseline rasterizer state once */
 786    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 787    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 788    st->bitmap.rasterizer.bypass_vs = 1;
 789
 790    /* find a usable texture format */
 791    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D,
 792                                    PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 793       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 794    }
 795    else {
 796       /* XXX support more formats */
 797       assert(0);
 798    }
 799
 800    /* alloc bitmap cache object */
 801    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 802
 803    reset_cache(st);
 804 }
 805
 806
 807 /** Per-context tear-down */
 808 void
 809 st_destroy_bitmap(struct st_context *st)
 810 {
 811    struct pipe_context *pipe = st->pipe;
 812    struct pipe_screen *screen = pipe->screen;
 813    struct bitmap_cache *cache = st->bitmap.cache;
 814
 815    screen->transfer_unmap(screen, cache->trans);
 816    screen->tex_transfer_release(screen, &cache->trans);
 817
 818    if (st->bitmap.vs) {
 819       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 820       st->bitmap.vs = NULL;
 821    }
 822    util_free_shader(&st->bitmap.vert_shader);
 823
 824    if (st->bitmap.vbuf) {
 825       pipe_buffer_reference(pipe->screen, &st->bitmap.vbuf, NULL);
 826       st->bitmap.vbuf = NULL;
 827    }
 828
 829    if (st->bitmap.cache) {
 830       pipe_texture_release(&st->bitmap.cache->texture);
 831       _mesa_free(st->bitmap.cache);
 832       st->bitmap.cache = NULL;
 833    }
 834 }