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_surface *surf;
  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    /* Ideally we'd have updated the pipe constants during the normal
 223     * st/atom mechanism.  But we can't since this is specific to glBitmap.
 224     */
 225    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 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 0xff.
 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    GLint row, col;
 247
 248 #define SET_PIXEL(COL, ROW) \
 249    destBuffer[(py + (ROW)) * destStride + px + (COL)] = 0x0;
 250
 251    for (row = 0; row < height; row++) {
 252       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 253                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 254
 255       if (unpack->LsbFirst) {
 256          /* Lsb first */
 257          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 258          for (col = 0; col < width; col++) {
 259
 260             if (*src & mask) {
 261                SET_PIXEL(col, row);
 262             }
 263
 264             if (mask == 128U) {
 265                src++;
 266                mask = 1U;
 267             }
 268             else {
 269                mask = mask << 1;
 270             }
 271          }
 272
 273          /* get ready for next row */
 274          if (mask != 1)
 275             src++;
 276       }
 277       else {
 278          /* Msb first */
 279          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 280          for (col = 0; col < width; col++) {
 281
 282             if (*src & mask) {
 283                SET_PIXEL(col, row);
 284             }
 285
 286             if (mask == 1U) {
 287                src++;
 288                mask = 128U;
 289             }
 290             else {
 291                mask = mask >> 1;
 292             }
 293          }
 294
 295          /* get ready for next row */
 296          if (mask != 128)
 297             src++;
 298       }
 299
 300    } /* row */
 301
 302 #undef SET_PIXEL
 303 }
 304
 305
 306 /**
 307  * Create a texture which represents a bitmap image.
 308  */
 309 static struct pipe_texture *
 310 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 311                     const struct gl_pixelstore_attrib *unpack,
 312                     const GLubyte *bitmap)
 313 {
 314    struct pipe_context *pipe = ctx->st->pipe;
 315    struct pipe_screen *screen = pipe->screen;
 316    struct pipe_surface *surface;
 317    ubyte *dest;
 318    struct pipe_texture *pt;
 319
 320    /* PBO source... */
 321    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 322    if (!bitmap) {
 323       return NULL;
 324    }
 325
 326    /**
 327     * Create texture to hold bitmap pattern.
 328     */
 329    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 330                           0, width, height, 1, 0,
 331                           PIPE_TEXTURE_USAGE_SAMPLER);
 332    if (!pt) {
 333       _mesa_unmap_bitmap_pbo(ctx, unpack);
 334       return NULL;
 335    }
 336
 337    surface = screen->get_tex_surface(screen, pt, 0, 0, 0,
 338                                      PIPE_BUFFER_USAGE_CPU_WRITE);
 339
 340    /* map texture surface */
 341    dest = screen->surface_map(screen, surface, PIPE_BUFFER_USAGE_CPU_WRITE);
 342
 343    /* Put image into texture surface */
 344    memset(dest, 0xff, height * surface->stride);
 345    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 346                  dest, surface->stride);
 347
 348    _mesa_unmap_bitmap_pbo(ctx, unpack);
 349
 350    /* Release surface */
 351    screen->surface_unmap(screen, surface);
 352    pipe_surface_reference(&surface, NULL);
 353
 354    return pt;
 355 }
 356
 357
 358 static void
 359 setup_bitmap_vertex_data(struct st_context *st,
 360                          int x, int y, int width, int height,
 361                          float z, const float color[4])
 362 {
 363    struct pipe_context *pipe = st->pipe;
 364    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 365    const GLfloat fb_width = (GLfloat)fb->Width;
 366    const GLfloat fb_height = (GLfloat)fb->Height;
 367    const GLfloat x0 = (GLfloat)x;
 368    const GLfloat x1 = (GLfloat)(x + width);
 369    const GLfloat y0 = (GLfloat)y;
 370    const GLfloat y1 = (GLfloat)(y + height);
 371    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 372    const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 373    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 374    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 375    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 376    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 377    GLuint i;
 378    void *buf;
 379
 380    if (!st->bitmap.vbuf) {
 381       st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
 382                                            sizeof(st->bitmap.vertices));
 383    }
 384
 385    /* Positions are in clip coords since we need to do clipping in case
 386     * the bitmap quad goes beyond the window bounds.
 387     */
 388    st->bitmap.vertices[0][0][0] = clip_x0;
 389    st->bitmap.vertices[0][0][1] = clip_y0;
 390    st->bitmap.vertices[0][2][0] = sLeft;
 391    st->bitmap.vertices[0][2][1] = tTop;
 392
 393    st->bitmap.vertices[1][0][0] = clip_x1;
 394    st->bitmap.vertices[1][0][1] = clip_y0;
 395    st->bitmap.vertices[1][2][0] = sRight;
 396    st->bitmap.vertices[1][2][1] = tTop;
 397
 398    st->bitmap.vertices[2][0][0] = clip_x1;
 399    st->bitmap.vertices[2][0][1] = clip_y1;
 400    st->bitmap.vertices[2][2][0] = sRight;
 401    st->bitmap.vertices[2][2][1] = tBot;
 402
 403    st->bitmap.vertices[3][0][0] = clip_x0;
 404    st->bitmap.vertices[3][0][1] = clip_y1;
 405    st->bitmap.vertices[3][2][0] = sLeft;
 406    st->bitmap.vertices[3][2][1] = tBot;
 407
 408    /* same for all verts: */
 409    for (i = 0; i < 4; i++) {
 410       st->bitmap.vertices[i][0][2] = z;
 411       st->bitmap.vertices[i][0][3] = 1.0;
 412       st->bitmap.vertices[i][1][0] = color[0];
 413       st->bitmap.vertices[i][1][1] = color[1];
 414       st->bitmap.vertices[i][1][2] = color[2];
 415       st->bitmap.vertices[i][1][3] = color[3];
 416       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 417       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 418    }
 419
 420    /* put vertex data into vbuf */
 421    buf = pipe_buffer_map(pipe->screen, st->bitmap.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
 422    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 423    pipe_buffer_unmap(pipe->screen, st->bitmap.vbuf);
 424 }
 425
 426
 427
 428 /**
 429  * Render a glBitmap by drawing a textured quad
 430  */
 431 static void
 432 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 433                  GLsizei width, GLsizei height,
 434                  struct pipe_texture *pt,
 435                  const GLfloat *color)
 436 {
 437    struct st_context *st = ctx->st;
 438    struct pipe_context *pipe = ctx->st->pipe;
 439    struct cso_context *cso = ctx->st->cso_context;
 440    struct st_fragment_program *stfp;
 441    GLuint maxSize;
 442
 443    stfp = combined_bitmap_fragment_program(ctx);
 444
 445    /* limit checks */
 446    /* XXX if the bitmap is larger than the max texture size, break
 447     * it up into chunks.
 448     */
 449    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 450    assert(width <= (GLsizei)maxSize);
 451    assert(height <= (GLsizei)maxSize);
 452
 453    cso_save_rasterizer(cso);
 454    cso_save_samplers(cso);
 455    cso_save_sampler_textures(cso);
 456    cso_save_viewport(cso);
 457    cso_save_fragment_shader(cso);
 458    cso_save_vertex_shader(cso);
 459
 460    /* rasterizer state: just scissor */
 461    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 462    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 463
 464    /* fragment shader state: TEX lookup program */
 465    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 466
 467    /* vertex shader state: position + texcoord pass-through */
 468    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 469
 470    /* user samplers, plus our bitmap sampler */
 471    {
 472       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 473       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 474       uint i;
 475       for (i = 0; i < st->state.num_samplers; i++) {
 476          samplers[i] = &st->state.samplers[i];
 477       }
 478       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 479       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);   }
 480
 481    /* user textures, plus the bitmap texture */
 482    {
 483       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 484       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 485       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 486       textures[stfp->bitmap_sampler] = pt;
 487       cso_set_sampler_textures(cso, num, textures);
 488    }
 489
 490    /* viewport state: viewport matching window dims */
 491    {
 492       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 493       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 494       const GLfloat width = (GLfloat)fb->Width;
 495       const GLfloat height = (GLfloat)fb->Height;
 496       struct pipe_viewport_state vp;
 497       vp.scale[0] =  0.5f * width;
 498       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 499       vp.scale[2] = 1.0f;
 500       vp.scale[3] = 1.0f;
 501       vp.translate[0] = 0.5f * width;
 502       vp.translate[1] = 0.5f * height;
 503       vp.translate[2] = 0.0f;
 504       vp.translate[3] = 0.0f;
 505       cso_set_viewport(cso, &vp);
 506    }
 507
 508    /* draw textured quad */
 509    setup_bitmap_vertex_data(st, x, y, width, height,
 510                             ctx->Current.RasterPos[2],
 511                             color);
 512
 513    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 514                            PIPE_PRIM_TRIANGLE_FAN,
 515                            4,  /* verts */
 516                            3); /* attribs/vert */
 517
 518
 519    /* restore state */
 520    cso_restore_rasterizer(cso);
 521    cso_restore_samplers(cso);
 522    cso_restore_sampler_textures(cso);
 523    cso_restore_viewport(cso);
 524    cso_restore_fragment_shader(cso);
 525    cso_restore_vertex_shader(cso);
 526 }
 527
 528
 529 static void
 530 reset_cache(struct st_context *st)
 531 {
 532    struct pipe_context *pipe = st->pipe;
 533    struct pipe_screen *screen = pipe->screen;
 534    struct bitmap_cache *cache = st->bitmap.cache;
 535
 536    //memset(cache->buffer, 0xff, sizeof(cache->buffer));
 537    cache->empty = GL_TRUE;
 538
 539    cache->xmin = 1000000;
 540    cache->xmax = -1000000;
 541    cache->ymin = 1000000;
 542    cache->ymax = -1000000;
 543
 544    if (cache->surf)
 545       screen->tex_surface_release(screen, &cache->surf);
 546
 547    assert(!cache->texture);
 548
 549    /* allocate a new texture */
 550    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 551                                       st->bitmap.tex_format, 0,
 552                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 553                                       1, 0,
 554                                       PIPE_TEXTURE_USAGE_SAMPLER);
 555
 556    /* Map the texture surface.
 557     * Subsequent glBitmap calls will write into the texture image.
 558     */
 559    cache->surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0,
 560                                          PIPE_BUFFER_USAGE_CPU_WRITE);
 561    cache->buffer = screen->surface_map(screen, cache->surf,
 562                                        PIPE_BUFFER_USAGE_CPU_WRITE);
 563
 564    /* init image to all 0xff */
 565    memset(cache->buffer, 0xff, BITMAP_CACHE_WIDTH * BITMAP_CACHE_HEIGHT);
 566 }
 567
 568
 569 /**
 570  * If there's anything in the bitmap cache, draw/flush it now.
 571  */
 572 void
 573 st_flush_bitmap_cache(struct st_context *st)
 574 {
 575    if (!st->bitmap.cache->empty) {
 576       struct bitmap_cache *cache = st->bitmap.cache;
 577
 578       if (st->ctx->DrawBuffer) {
 579          struct pipe_context *pipe = st->pipe;
 580          struct pipe_screen *screen = pipe->screen;
 581
 582          assert(cache->xmin <= cache->xmax);
 583          /*
 584          printf("flush size %d x %d  at %d, %d\n",
 585                 cache->xmax - cache->xmin,
 586                 cache->ymax - cache->ymin,
 587                 cache->xpos, cache->ypos);
 588          */
 589
 590          /* The texture surface has been mapped until now.
 591           * So unmap and release the texture surface before drawing.
 592           */
 593          screen->surface_unmap(screen, cache->surf);
 594          cache->buffer = NULL;
 595
 596          screen->tex_surface_release(screen, &cache->surf);
 597
 598          draw_bitmap_quad(st->ctx,
 599                           cache->xpos,
 600                           cache->ypos,
 601                           st->ctx->Current.RasterPos[2],
 602                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 603                           cache->texture,
 604                           cache->color);
 605       }
 606
 607       /* release/free the texture */
 608       pipe_texture_reference(&cache->texture, NULL);
 609
 610       reset_cache(st);
 611    }
 612 }
 613
 614
 615 /**
 616  * Try to accumulate this glBitmap call in the bitmap cache.
 617  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 618  */
 619 static GLboolean
 620 accum_bitmap(struct st_context *st,
 621              GLint x, GLint y, GLsizei width, GLsizei height,
 622              const struct gl_pixelstore_attrib *unpack,
 623              const GLubyte *bitmap )
 624 {
 625    struct bitmap_cache *cache = st->bitmap.cache;
 626    int px = -999, py;
 627
 628    if (width > BITMAP_CACHE_WIDTH ||
 629        height > BITMAP_CACHE_HEIGHT)
 630       return GL_FALSE; /* too big to cache */
 631
 632    if (!cache->empty) {
 633       px = x - cache->xpos;  /* pos in buffer */
 634       py = y - cache->ypos;
 635       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 636           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 637           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color)) {
 638          /* This bitmap would extend beyond cache bounds, or the bitmap
 639           * color is changing
 640           * so flush and continue.
 641           */
 642          st_flush_bitmap_cache(st);
 643       }
 644    }
 645
 646    if (cache->empty) {
 647       /* Initialize.  Center bitmap vertically in the buffer. */
 648       px = 0;
 649       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 650       cache->xpos = x;
 651       cache->ypos = y - py;
 652       cache->empty = GL_FALSE;
 653       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 654    }
 655
 656    assert(px != -999);
 657
 658    if (x < cache->xmin)
 659       cache->xmin = x;
 660    if (y < cache->ymin)
 661       cache->ymin = y;
 662    if (x + width > cache->xmax)
 663       cache->xmax = x + width;
 664    if (y + height > cache->ymax)
 665       cache->ymax = y + height;
 666
 667    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 668                  cache->buffer, BITMAP_CACHE_WIDTH);
 669
 670    return GL_TRUE; /* accumulated */
 671 }
 672
 673
 674
 675 /**
 676  * Called via ctx->Driver.Bitmap()
 677  */
 678 static void
 679 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 680           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 681 {
 682    struct st_context *st = ctx->st;
 683    struct pipe_texture *pt;
 684
 685    if (width == 0 || height == 0)
 686       return;
 687
 688    st_validate_state(st);
 689
 690    if (!st->bitmap.vs) {
 691       /* create pass-through vertex shader now */
 692       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 693                                       TGSI_SEMANTIC_COLOR,
 694                                       TGSI_SEMANTIC_GENERIC };
 695       const uint semantic_indexes[] = { 0, 0, 0 };
 696       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 697                                                           semantic_names,
 698                                                           semantic_indexes,
 699                                                           &st->bitmap.vert_shader);
 700    }
 701
 702    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 703       return;
 704
 705    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 706    if (pt) {
 707       assert(pt->target == PIPE_TEXTURE_2D);
 708       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 709                        width, height, pt,
 710                        st->ctx->Current.RasterColor);
 711       /* release/free the texture */
 712       pipe_texture_reference(&pt, NULL);
 713    }
 714 }
 715
 716
 717 /** Per-context init */
 718 void
 719 st_init_bitmap_functions(struct dd_function_table *functions)
 720 {
 721    functions->Bitmap = st_Bitmap;
 722 }
 723
 724
 725 /** Per-context init */
 726 void
 727 st_init_bitmap(struct st_context *st)
 728 {
 729    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 730    struct pipe_context *pipe = st->pipe;
 731    struct pipe_screen *screen = pipe->screen;
 732
 733    /* init sampler state once */
 734    memset(sampler, 0, sizeof(*sampler));
 735    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 736    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 737    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 738    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 739    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 740    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 741    sampler->normalized_coords = 1;
 742
 743    /* init baseline rasterizer state once */
 744    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 745    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 746    st->bitmap.rasterizer.bypass_vs = 1;
 747
 748    /* find a usable texture format */
 749    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D,
 750                                    PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 751       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 752    }
 753    else {
 754       /* XXX support more formats */
 755       assert(0);
 756    }
 757
 758    /* alloc bitmap cache object */
 759    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 760
 761    reset_cache(st);
 762 }
 763
 764
 765 /** Per-context tear-down */
 766 void
 767 st_destroy_bitmap(struct st_context *st)
 768 {
 769    struct pipe_context *pipe = st->pipe;
 770    struct pipe_screen *screen = pipe->screen;
 771    struct bitmap_cache *cache = st->bitmap.cache;
 772
 773    screen->surface_unmap(screen, cache->surf);
 774    screen->tex_surface_release(screen, &cache->surf);
 775
 776    if (st->bitmap.vs) {
 777       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 778       st->bitmap.vs = NULL;
 779    }
 780
 781    if (st->bitmap.vbuf) {
 782       pipe_buffer_reference(pipe->screen, &st->bitmap.vbuf, NULL);
 783       st->bitmap.vbuf = NULL;
 784    }
 785
 786    if (st->bitmap.cache) {
 787       pipe_texture_release(&st->bitmap.cache->texture);
 788       FREE(st->bitmap.cache);
 789       st->bitmap.cache = NULL;
 790    }
 791 }