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