src/mesa/state_tracker/st_cb_bitmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Brian Paul
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/bufferobj.h"
  36 #include "main/macros.h"
  37 #include "main/texformat.h"
  38 #include "shader/program.h"
  39 #include "shader/prog_parameter.h"
  40 #include "shader/prog_print.h"
  41
  42 #include "st_context.h"
  43 #include "st_atom.h"
  44 #include "st_atom_constbuf.h"
  45 #include "st_program.h"
  46 #include "st_cb_bitmap.h"
  47 #include "st_cb_program.h"
  48 #include "st_mesa_to_tgsi.h"
  49 #include "st_texture.h"
  50 #include "pipe/p_context.h"
  51 #include "pipe/p_defines.h"
  52 #include "pipe/p_inlines.h"
  53 #include "pipe/p_winsys.h"
  54 #include "util/p_tile.h"
  55 #include "util/u_draw_quad.h"
  56 #include "util/u_simple_shaders.h"
  57 #include "shader/prog_instruction.h"
  58 #include "cso_cache/cso_context.h"
  59
  60
  61
  62 /**
  63  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  64  * is stored in a texture image.  An alpha8 texture format is used.
  65  * The fragment shader samples a bit (texel) from the texture, then
  66  * discards the fragment if the bit is off.
  67  *
  68  * Note that we actually store the inverse image of the bitmap to
  69  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  70  * and an "off" bit is stored as texel=0xff.  Then we kill the
  71  * fragment if the negated texel value is less than zero.
  72  */
  73
  74
  75 /**
  76  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  77  * buffer which is then rendered en mass upon a flush, state change, etc.
  78  * A wide, short buffer is used to target the common case of a series
  79  * of glBitmap calls being used to draw text.
  80  */
  81 static GLboolean UseBitmapCache = GL_TRUE;
  82
  83
  84 #define BITMAP_CACHE_WIDTH  512
  85 #define BITMAP_CACHE_HEIGHT 32
  86
  87 struct bitmap_cache
  88 {
  89    /** Window pos to render the cached image */
  90    GLint xpos, ypos;
  91    /** Bounds of region used in window coords */
  92    GLint xmin, ymin, xmax, ymax;
  93
  94    struct pipe_texture *texture;
  95    struct pipe_surface *surf;
  96
  97    GLboolean empty;
  98
  99    /** An I8 texture image: */
 100    ubyte *buffer;
 101 };
 102
 103
 104
 105
 106 /**
 107  * Make fragment program for glBitmap:
 108  *   Sample the texture and kill the fragment if the bit is 0.
 109  * This program will be combined with the user's fragment program.
 110  */
 111 static struct st_fragment_program *
 112 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 113 {
 114    struct st_fragment_program *stfp;
 115    struct gl_program *p;
 116    GLuint ic = 0;
 117
 118    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 119    if (!p)
 120       return NULL;
 121
 122    p->NumInstructions = 3;
 123
 124    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 125    if (!p->Instructions) {
 126       ctx->Driver.DeleteProgram(ctx, p);
 127       return NULL;
 128    }
 129    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 130
 131    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 132    p->Instructions[ic].Opcode = OPCODE_TEX;
 133    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 134    p->Instructions[ic].DstReg.Index = 0;
 135    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 136    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 137    p->Instructions[ic].TexSrcUnit = samplerIndex;
 138    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 139    ic++;
 140
 141    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 142    p->Instructions[ic].Opcode = OPCODE_KIL;
 143    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 144    p->Instructions[ic].SrcReg[0].Index = 0;
 145    p->Instructions[ic].SrcReg[0].NegateBase = NEGATE_XYZW;
 146    ic++;
 147
 148    /* END; */
 149    p->Instructions[ic++].Opcode = OPCODE_END;
 150
 151    assert(ic == p->NumInstructions);
 152
 153    p->InputsRead = FRAG_BIT_TEX0;
 154    p->OutputsWritten = 0x0;
 155    p->SamplersUsed = (1 << samplerIndex);
 156
 157    stfp = (struct st_fragment_program *) p;
 158    stfp->Base.UsesKill = GL_TRUE;
 159    st_translate_fragment_program(ctx->st, stfp, NULL);
 160
 161    return stfp;
 162 }
 163
 164
 165 static int
 166 find_free_bit(uint bitfield)
 167 {
 168    int i;
 169    for (i = 0; i < 32; i++) {
 170       if ((bitfield & (1 << i)) == 0) {
 171          return i;
 172       }
 173    }
 174    return -1;
 175 }
 176
 177
 178 /**
 179  * Combine basic bitmap fragment program with the user-defined program.
 180  */
 181 static struct st_fragment_program *
 182 combined_bitmap_fragment_program(GLcontext *ctx)
 183 {
 184    struct st_context *st = ctx->st;
 185    struct st_fragment_program *stfp = st->fp;
 186
 187    if (!stfp->bitmap_program) {
 188       /*
 189        * Generate new program which is the user-defined program prefixed
 190        * with the bitmap sampler/kill instructions.
 191        */
 192       struct st_fragment_program *bitmap_prog;
 193       uint sampler;
 194
 195       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 196       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 197
 198       stfp->bitmap_program = (struct st_fragment_program *)
 199          _mesa_combine_programs(ctx,
 200                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 201       stfp->bitmap_program->bitmap_sampler = sampler;
 202 #if 0
 203       {
 204          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 205          printf("Combined bitmap program:\n");
 206          _mesa_print_program(p);
 207          printf("InputsRead: 0x%x\n", p->InputsRead);
 208          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 209          _mesa_print_parameter_list(p->Parameters);
 210       }
 211 #endif
 212
 213       /* translate to TGSI tokens */
 214       st_translate_fragment_program(st, stfp->bitmap_program, NULL);
 215    }
 216
 217    /* Ideally we'd have updated the pipe constants during the normal
 218     * st/atom mechanism.  But we can't since this is specific to glBitmap.
 219     */
 220    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 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_surface *surface;
 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    if (!pt) {
 327       _mesa_unmap_bitmap_pbo(ctx, unpack);
 328       return NULL;
 329    }
 330
 331    surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 332
 333    /* map texture surface */
 334    dest = pipe_surface_map(surface);
 335
 336    /* Put image into texture surface */
 337    memset(dest, 0xff, height * surface->pitch);
 338    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 339                  dest, surface->pitch);
 340
 341    _mesa_unmap_bitmap_pbo(ctx, unpack);
 342
 343    /* Release surface */
 344    pipe_surface_unmap(surface);
 345    pipe_surface_reference(&surface, NULL);
 346    pipe->texture_update(pipe, pt, 0, 0x1);
 347
 348    return pt;
 349 }
 350
 351
 352 static void
 353 setup_bitmap_vertex_data(struct st_context *st,
 354                          int x, int y, int width, int height,
 355                          float z, const float color[4])
 356 {
 357    struct pipe_context *pipe = st->pipe;
 358    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 359    const GLfloat fb_width = fb->Width;
 360    const GLfloat fb_height = fb->Height;
 361    const GLfloat x0 = x;
 362    const GLfloat x1 = x + width;
 363    const GLfloat y0 = y;
 364    const GLfloat y1 = y + height;
 365    const GLfloat sLeft = 0.0F, sRight = 1.0F;
 366    const GLfloat tTop = 0.0, tBot = 1.0 - tTop;
 367    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 368    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 369    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 370    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 371    GLuint i;
 372    void *buf;
 373
 374    if (!st->bitmap.vbuf) {
 375       st->bitmap.vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
 376                                                    PIPE_BUFFER_USAGE_VERTEX,
 377                                                    sizeof(st->bitmap.vertices));
 378    }
 379
 380    /* Positions are in clip coords since we need to do clipping in case
 381     * the bitmap quad goes beyond the window bounds.
 382     */
 383    st->bitmap.vertices[0][0][0] = clip_x0;
 384    st->bitmap.vertices[0][0][1] = clip_y0;
 385    st->bitmap.vertices[0][2][0] = sLeft;
 386    st->bitmap.vertices[0][2][1] = tTop;
 387
 388    st->bitmap.vertices[1][0][0] = clip_x1;
 389    st->bitmap.vertices[1][0][1] = clip_y0;
 390    st->bitmap.vertices[1][2][0] = sRight;
 391    st->bitmap.vertices[1][2][1] = tTop;
 392
 393    st->bitmap.vertices[2][0][0] = clip_x1;
 394    st->bitmap.vertices[2][0][1] = clip_y1;
 395    st->bitmap.vertices[2][2][0] = sRight;
 396    st->bitmap.vertices[2][2][1] = tBot;
 397
 398    st->bitmap.vertices[3][0][0] = clip_x0;
 399    st->bitmap.vertices[3][0][1] = clip_y1;
 400    st->bitmap.vertices[3][2][0] = sLeft;
 401    st->bitmap.vertices[3][2][1] = tBot;
 402
 403    /* same for all verts: */
 404    for (i = 0; i < 4; i++) {
 405       st->bitmap.vertices[i][0][2] = z;
 406       st->bitmap.vertices[i][0][3] = 1.0;
 407       st->bitmap.vertices[i][1][0] = color[0];
 408       st->bitmap.vertices[i][1][1] = color[1];
 409       st->bitmap.vertices[i][1][2] = color[2];
 410       st->bitmap.vertices[i][1][3] = color[3];
 411       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 412       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 413    }
 414
 415    /* put vertex data into vbuf */
 416    buf = pipe->winsys->buffer_map(pipe->winsys, st->bitmap.vbuf,
 417                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 418    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 419    pipe->winsys->buffer_unmap(pipe->winsys, st->bitmap.vbuf);
 420 }
 421
 422
 423
 424 /**
 425  * Render a glBitmap by drawing a textured quad
 426  */
 427 static void
 428 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 429                  GLsizei width, GLsizei height,
 430                  struct pipe_texture *pt)
 431 {
 432    struct st_context *st = ctx->st;
 433    struct pipe_context *pipe = ctx->st->pipe;
 434    struct cso_context *cso = ctx->st->cso_context;
 435    struct st_fragment_program *stfp;
 436    GLuint maxSize;
 437
 438    stfp = combined_bitmap_fragment_program(ctx);
 439
 440    /* limit checks */
 441    /* XXX if the bitmap is larger than the max texture size, break
 442     * it up into chunks.
 443     */
 444    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 445    assert(width <= maxSize);
 446    assert(height <= maxSize);
 447
 448    cso_save_rasterizer(cso);
 449    cso_save_samplers(cso);
 450    cso_save_sampler_textures(cso);
 451    cso_save_viewport(cso);
 452    cso_save_fragment_shader(cso);
 453    cso_save_vertex_shader(cso);
 454
 455    /* rasterizer state: just scissor */
 456    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 457    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 458
 459    /* fragment shader state: TEX lookup program */
 460    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 461
 462    /* vertex shader state: position + texcoord pass-through */
 463    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 464
 465    /* user samplers, plus our bitmap sampler */
 466    {
 467       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 468       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 469       uint i;
 470       for (i = 0; i < st->state.num_samplers; i++) {
 471          samplers[i] = &st->state.samplers[i];
 472       }
 473       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 474       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);   }
 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 float width = fb->Width;
 490       const float height = fb->Height;
 491       struct pipe_viewport_state vp;
 492       vp.scale[0] =  0.5 * width;
 493       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 494       vp.scale[2] = 1.0;
 495       vp.scale[3] = 1.0;
 496       vp.translate[0] = 0.5 * width;
 497       vp.translate[1] = 0.5 * height;
 498       vp.translate[2] = 0.0;
 499       vp.translate[3] = 0.0;
 500       cso_set_viewport(cso, &vp);
 501    }
 502
 503    /* draw textured quad */
 504    setup_bitmap_vertex_data(st, x, y, width, height,
 505                             ctx->Current.RasterPos[2],
 506                             ctx->Current.RasterColor);
 507
 508    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 509                            PIPE_PRIM_TRIANGLE_FAN,
 510                            4,  /* verts */
 511                            3); /* attribs/vert */
 512
 513
 514    /* restore state */
 515    cso_restore_rasterizer(cso);
 516    cso_restore_samplers(cso);
 517    cso_restore_sampler_textures(cso);
 518    cso_restore_viewport(cso);
 519    cso_restore_fragment_shader(cso);
 520    cso_restore_vertex_shader(cso);
 521 }
 522
 523
 524 static void
 525 reset_cache(struct st_context *st)
 526 {
 527    struct pipe_context *pipe = st->pipe;
 528    struct pipe_screen *screen = pipe->screen;
 529    struct bitmap_cache *cache = st->bitmap.cache;
 530
 531    //memset(cache->buffer, 0xff, sizeof(cache->buffer));
 532    cache->empty = GL_TRUE;
 533
 534    cache->xmin = 1000000;
 535    cache->xmax = -1000000;
 536    cache->ymin = 1000000;
 537    cache->ymax = -1000000;
 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, 0);
 546
 547    /* Map the texture surface.
 548     * Subsequent glBitmap calls will write into the texture image.
 549     */
 550    cache->surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0);
 551    cache->buffer = pipe_surface_map(cache->surf);
 552
 553    /* init image to all 0xff */
 554    memset(cache->buffer, 0xff, BITMAP_CACHE_WIDTH * BITMAP_CACHE_HEIGHT);
 555 }
 556
 557
 558 /**
 559  * If there's anything in the bitmap cache, draw/flush it now.
 560  */
 561 void
 562 st_flush_bitmap_cache(struct st_context *st)
 563 {
 564    if (!st->bitmap.cache->empty) {
 565       if (st->ctx->DrawBuffer) {
 566          struct bitmap_cache *cache = st->bitmap.cache;
 567          struct pipe_context *pipe = st->pipe;
 568
 569          assert(cache->xmin <= cache->xmax);
 570          /*
 571          printf("flush size %d x %d  at %d, %d\n",
 572                 cache->xmax - cache->xmin,
 573                 cache->ymax - cache->ymin,
 574                 cache->xpos, cache->ypos);
 575          */
 576
 577          /* The texture surface has been mapped until now.
 578           * So unmap and release the texture surface before drawing.
 579           */
 580          pipe_surface_unmap(cache->surf);
 581          pipe_surface_reference(&cache->surf, NULL);
 582
 583          /* XXX is this needed? */
 584          pipe->texture_update(pipe, cache->texture, 0, 0x1);
 585
 586          draw_bitmap_quad(st->ctx,
 587                           cache->xpos,
 588                           cache->ypos,
 589                           st->ctx->Current.RasterPos[2],
 590                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 591                           cache->texture);
 592
 593          /* release/free the texture */
 594          pipe_texture_reference(&cache->texture, NULL);
 595       }
 596       reset_cache(st);
 597    }
 598 }
 599
 600
 601 /**
 602  * Try to accumulate this glBitmap call in the bitmap cache.
 603  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 604  */
 605 static GLboolean
 606 accum_bitmap(struct st_context *st,
 607              GLint x, GLint y, GLsizei width, GLsizei height,
 608              const struct gl_pixelstore_attrib *unpack,
 609              const GLubyte *bitmap )
 610 {
 611    struct bitmap_cache *cache = st->bitmap.cache;
 612    int px = -999, py;
 613
 614    if (width > BITMAP_CACHE_WIDTH ||
 615        height > BITMAP_CACHE_HEIGHT)
 616       return GL_FALSE; /* too big to cache */
 617
 618    if (!cache->empty) {
 619       px = x - cache->xpos;  /* pos in buffer */
 620       py = y - cache->ypos;
 621       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 622           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 623          /* This bitmap would extend beyond cache bounds,
 624           * so flush and continue.
 625           */
 626          st_flush_bitmap_cache(st);
 627       }
 628    }
 629
 630    if (cache->empty) {
 631       /* Initialize.  Center bitmap vertically in the buffer. */
 632       px = 0;
 633       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 634       cache->xpos = x;
 635       cache->ypos = y - py;
 636       cache->empty = GL_FALSE;
 637    }
 638
 639    assert(px != -999);
 640
 641    if (x < cache->xmin)
 642       cache->xmin = x;
 643    if (y < cache->ymin)
 644       cache->ymin = y;
 645    if (x + width > cache->xmax)
 646       cache->xmax = x + width;
 647    if (y + height > cache->ymax)
 648       cache->ymax = y + height;
 649
 650    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 651                  cache->buffer, BITMAP_CACHE_WIDTH);
 652
 653    return GL_TRUE; /* accumulated */
 654 }
 655
 656
 657
 658 /**
 659  * Called via ctx->Driver.Bitmap()
 660  */
 661 static void
 662 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 663           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 664 {
 665    struct st_context *st = ctx->st;
 666    struct pipe_texture *pt;
 667
 668    st_validate_state(st);
 669
 670    if (!st->bitmap.vs) {
 671       /* create pass-through vertex shader now */
 672       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 673                                       TGSI_SEMANTIC_COLOR,
 674                                       TGSI_SEMANTIC_GENERIC };
 675       const uint semantic_indexes[] = { 0, 0, 0 };
 676       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 677                                                           semantic_names,
 678                                                           semantic_indexes,
 679                                                           &st->bitmap.vert_shader);
 680    }
 681
 682    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 683       return;
 684
 685    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 686    if (pt) {
 687       assert(pt->target == PIPE_TEXTURE_2D);
 688       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 689                        width, height, pt);
 690       /* release/free the texture */
 691       pipe_texture_reference(&pt, NULL);
 692    }
 693 }
 694
 695
 696 /** Per-context init */
 697 void
 698 st_init_bitmap_functions(struct dd_function_table *functions)
 699 {
 700    functions->Bitmap = st_Bitmap;
 701 }
 702
 703
 704 /** Per-context init */
 705 void
 706 st_init_bitmap(struct st_context *st)
 707 {
 708    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 709    struct pipe_context *pipe = st->pipe;
 710    struct pipe_screen *screen = pipe->screen;
 711
 712    /* init sampler state once */
 713    memset(sampler, 0, sizeof(*sampler));
 714    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 715    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 716    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 717    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 718    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 719    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 720    sampler->normalized_coords = 1;
 721
 722    /* init baseline rasterizer state once */
 723    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 724    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 725    st->bitmap.rasterizer.bypass_vs = 1;
 726
 727    /* find a usable texture format */
 728    if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
 729       st->bitmap.tex_format = PIPE_FORMAT_U_I8;
 730    }
 731    else {
 732       /* XXX support more formats */
 733       assert(0);
 734    }
 735
 736    /* alloc bitmap cache object */
 737    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 738
 739    reset_cache(st);
 740 }
 741
 742
 743 /** Per-context tear-down */
 744 void
 745 st_destroy_bitmap(struct st_context *st)
 746 {
 747    struct pipe_context *pipe = st->pipe;
 748
 749 #if 0
 750    if (st->bitmap.combined_prog) {
 751       st_delete_program(st->ctx, &st->bitmap.combined_prog->Base.Base);
 752    }
 753
 754    if (st->bitmap.program) {
 755       st_delete_program(st->ctx, &st->bitmap.program->Base.Base);
 756    }
 757 #endif
 758    if (st->bitmap.vs) {
 759       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 760       st->bitmap.vs = NULL;
 761    }
 762
 763    if (st->bitmap.vbuf) {
 764       pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
 765       st->bitmap.vbuf = NULL;
 766    }
 767
 768    if (st->bitmap.cache) {
 769       pipe_texture_release(&st->bitmap.cache->texture);
 770       FREE(st->bitmap.cache);
 771       st->bitmap.cache = NULL;
 772    }
 773 }