src/mesa/state_tracker/st_cb_bitmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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/pbo.h"
  38 #include "program/program.h"
  39 #include "program/prog_print.h"
  40
  41 #include "st_context.h"
  42 #include "st_atom.h"
  43 #include "st_atom_constbuf.h"
  44 #include "st_program.h"
  45 #include "st_cb_bitmap.h"
  46 #include "st_texture.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_defines.h"
  50 #include "pipe/p_shader_tokens.h"
  51 #include "util/u_inlines.h"
  52 #include "util/u_draw_quad.h"
  53 #include "util/u_simple_shaders.h"
  54 #include "util/u_upload_mgr.h"
  55 #include "program/prog_instruction.h"
  56 #include "cso_cache/cso_context.h"
  57
  58
  59 /**
  60  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  61  * is stored in a texture image.  An alpha8 texture format is used.
  62  * The fragment shader samples a bit (texel) from the texture, then
  63  * discards the fragment if the bit is off.
  64  *
  65  * Note that we actually store the inverse image of the bitmap to
  66  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  67  * and an "off" bit is stored as texel=0xff.  Then we kill the
  68  * fragment if the negated texel value is less than zero.
  69  */
  70
  71
  72 /**
  73  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  74  * buffer which is then rendered en mass upon a flush, state change, etc.
  75  * A wide, short buffer is used to target the common case of a series
  76  * of glBitmap calls being used to draw text.
  77  */
  78 static GLboolean UseBitmapCache = GL_TRUE;
  79
  80
  81 #define BITMAP_CACHE_WIDTH  512
  82 #define BITMAP_CACHE_HEIGHT 32
  83
  84 struct bitmap_cache
  85 {
  86    /** Window pos to render the cached image */
  87    GLint xpos, ypos;
  88    /** Bounds of region used in window coords */
  89    GLint xmin, ymin, xmax, ymax;
  90
  91    GLfloat color[4];
  92
  93    /** Bitmap's Z position */
  94    GLfloat zpos;
  95
  96    struct pipe_resource *texture;
  97    struct pipe_transfer *trans;
  98
  99    GLboolean empty;
 100
 101    /** An I8 texture image: */
 102    ubyte *buffer;
 103 };
 104
 105
 106 /** Epsilon for Z comparisons */
 107 #define Z_EPSILON 1e-06
 108
 109
 110 /**
 111  * Copy user-provide bitmap bits into texture buffer, expanding
 112  * bits into texels.
 113  * "On" bits will set texels to 0x0.
 114  * "Off" bits will not modify texels.
 115  * Note that the image is actually going to be upside down in
 116  * the texture.  We deal with that with texcoords.
 117  */
 118 static void
 119 unpack_bitmap(struct st_context *st,
 120               GLint px, GLint py, GLsizei width, GLsizei height,
 121               const struct gl_pixelstore_attrib *unpack,
 122               const GLubyte *bitmap,
 123               ubyte *destBuffer, uint destStride)
 124 {
 125    destBuffer += py * destStride + px;
 126
 127    _mesa_expand_bitmap(width, height, unpack, bitmap,
 128                        destBuffer, destStride, 0x0);
 129 }
 130
 131
 132 /**
 133  * Create a texture which represents a bitmap image.
 134  */
 135 static struct pipe_resource *
 136 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 137                     const struct gl_pixelstore_attrib *unpack,
 138                     const GLubyte *bitmap)
 139 {
 140    struct st_context *st = st_context(ctx);
 141    struct pipe_context *pipe = st->pipe;
 142    struct pipe_transfer *transfer;
 143    ubyte *dest;
 144    struct pipe_resource *pt;
 145
 146    /* PBO source... */
 147    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 148    if (!bitmap) {
 149       return NULL;
 150    }
 151
 152    /**
 153     * Create texture to hold bitmap pattern.
 154     */
 155    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 156                           0, width, height, 1, 1, 0,
 157                           PIPE_BIND_SAMPLER_VIEW);
 158    if (!pt) {
 159       _mesa_unmap_pbo_source(ctx, unpack);
 160       return NULL;
 161    }
 162
 163    dest = pipe_transfer_map(st->pipe, pt, 0, 0,
 164                             PIPE_TRANSFER_WRITE,
 165                             0, 0, width, height, &transfer);
 166
 167    /* Put image into texture transfer */
 168    memset(dest, 0xff, height * transfer->stride);
 169    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 170                  dest, transfer->stride);
 171
 172    _mesa_unmap_pbo_source(ctx, unpack);
 173
 174    /* Release transfer */
 175    pipe_transfer_unmap(pipe, transfer);
 176    return pt;
 177 }
 178
 179 static void
 180 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 181                          int x, int y, int width, int height,
 182                          float z, const float color[4],
 183                          struct pipe_resource **vbuf,
 184                          unsigned *vbuf_offset)
 185 {
 186    const GLfloat fb_width = (GLfloat)st->state.framebuffer.width;
 187    const GLfloat fb_height = (GLfloat)st->state.framebuffer.height;
 188    const GLfloat x0 = (GLfloat)x;
 189    const GLfloat x1 = (GLfloat)(x + width);
 190    const GLfloat y0 = (GLfloat)y;
 191    const GLfloat y1 = (GLfloat)(y + height);
 192    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 193    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 194    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 195    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 196    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 197    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 198    GLuint i;
 199    float (*vertices)[3][4];  /**< vertex pos + color + texcoord */
 200
 201    if (!normalized) {
 202       sRight = (GLfloat) width;
 203       tBot = (GLfloat) height;
 204    }
 205
 206    u_upload_alloc(st->uploader, 0, 4 * sizeof(vertices[0]), 4,
 207                   vbuf_offset, vbuf, (void **) &vertices);
 208    if (!*vbuf) {
 209       return;
 210    }
 211
 212    /* Positions are in clip coords since we need to do clipping in case
 213     * the bitmap quad goes beyond the window bounds.
 214     */
 215    vertices[0][0][0] = clip_x0;
 216    vertices[0][0][1] = clip_y0;
 217    vertices[0][2][0] = sLeft;
 218    vertices[0][2][1] = tTop;
 219
 220    vertices[1][0][0] = clip_x1;
 221    vertices[1][0][1] = clip_y0;
 222    vertices[1][2][0] = sRight;
 223    vertices[1][2][1] = tTop;
 224
 225    vertices[2][0][0] = clip_x1;
 226    vertices[2][0][1] = clip_y1;
 227    vertices[2][2][0] = sRight;
 228    vertices[2][2][1] = tBot;
 229
 230    vertices[3][0][0] = clip_x0;
 231    vertices[3][0][1] = clip_y1;
 232    vertices[3][2][0] = sLeft;
 233    vertices[3][2][1] = tBot;
 234
 235    /* same for all verts: */
 236    for (i = 0; i < 4; i++) {
 237       vertices[i][0][2] = z;
 238       vertices[i][0][3] = 1.0f;
 239       vertices[i][1][0] = color[0];
 240       vertices[i][1][1] = color[1];
 241       vertices[i][1][2] = color[2];
 242       vertices[i][1][3] = color[3];
 243       vertices[i][2][2] = 0.0; /*R*/
 244       vertices[i][2][3] = 1.0; /*Q*/
 245    }
 246
 247    u_upload_unmap(st->uploader);
 248 }
 249
 250
 251 /**
 252  * Setup pipeline state prior to rendering the bitmap textured quad.
 253  */
 254 static void
 255 setup_render_state(struct gl_context *ctx,
 256                    struct pipe_sampler_view *sv,
 257                    const GLfloat *color)
 258 {
 259    struct st_context *st = st_context(ctx);
 260    struct cso_context *cso = st->cso_context;
 261    struct st_fp_variant *fpv;
 262    struct st_fp_variant_key key;
 263
 264    memset(&key, 0, sizeof(key));
 265    key.st = st->has_shareable_shaders ? NULL : st;
 266    key.bitmap = GL_TRUE;
 267    key.clamp_color = st->clamp_frag_color_in_shader &&
 268                      st->ctx->Color._ClampFragmentColor;
 269
 270    fpv = st_get_fp_variant(st, st->fp, &key);
 271
 272    /* As an optimization, Mesa's fragment programs will sometimes get the
 273     * primary color from a statevar/constant rather than a varying variable.
 274     * when that's the case, we need to ensure that we use the 'color'
 275     * parameter and not the current attribute color (which may have changed
 276     * through glRasterPos and state validation.
 277     * So, we force the proper color here.  Not elegant, but it works.
 278     */
 279    {
 280       GLfloat colorSave[4];
 281       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 282       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 283       st_upload_constants(st, st->fp->Base.Base.Parameters,
 284                           PIPE_SHADER_FRAGMENT);
 285       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 286    }
 287
 288    cso_save_rasterizer(cso);
 289    cso_save_fragment_samplers(cso);
 290    cso_save_fragment_sampler_views(cso);
 291    cso_save_viewport(cso);
 292    cso_save_fragment_shader(cso);
 293    cso_save_stream_outputs(cso);
 294    cso_save_vertex_shader(cso);
 295    cso_save_tessctrl_shader(cso);
 296    cso_save_tesseval_shader(cso);
 297    cso_save_geometry_shader(cso);
 298    cso_save_vertex_elements(cso);
 299    cso_save_aux_vertex_buffer_slot(cso);
 300
 301    /* rasterizer state: just scissor */
 302    st->bitmap.rasterizer.scissor = ctx->Scissor.EnableFlags & 1;
 303    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 304
 305    /* fragment shader state: TEX lookup program */
 306    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 307
 308    /* vertex shader state: position + texcoord pass-through */
 309    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 310
 311    /* disable other shaders */
 312    cso_set_tessctrl_shader_handle(cso, NULL);
 313    cso_set_tesseval_shader_handle(cso, NULL);
 314    cso_set_geometry_shader_handle(cso, NULL);
 315
 316    /* user samplers, plus our bitmap sampler */
 317    {
 318       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 319       uint num = MAX2(fpv->bitmap_sampler + 1,
 320                       st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 321       uint i;
 322       for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
 323          samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
 324       }
 325       samplers[fpv->bitmap_sampler] =
 326          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 327       cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
 328                        (const struct pipe_sampler_state **) samplers);
 329    }
 330
 331    /* user textures, plus the bitmap texture */
 332    {
 333       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 334       uint num = MAX2(fpv->bitmap_sampler + 1,
 335                       st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 336       memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 337              sizeof(sampler_views));
 338       sampler_views[fpv->bitmap_sampler] = sv;
 339       cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);
 340    }
 341
 342    /* viewport state: viewport matching window dims */
 343    {
 344       const GLboolean invert = st->state.fb_orientation == Y_0_TOP;
 345       const GLfloat width = (GLfloat)st->state.framebuffer.width;
 346       const GLfloat height = (GLfloat)st->state.framebuffer.height;
 347       struct pipe_viewport_state vp;
 348       vp.scale[0] =  0.5f * width;
 349       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 350       vp.scale[2] = 0.5f;
 351       vp.translate[0] = 0.5f * width;
 352       vp.translate[1] = 0.5f * height;
 353       vp.translate[2] = 0.5f;
 354       cso_set_viewport(cso, &vp);
 355    }
 356
 357    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 358    cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
 359 }
 360
 361
 362 /**
 363  * Restore pipeline state after rendering the bitmap textured quad.
 364  */
 365 static void
 366 restore_render_state(struct gl_context *ctx)
 367 {
 368    struct st_context *st = st_context(ctx);
 369    struct cso_context *cso = st->cso_context;
 370
 371    cso_restore_rasterizer(cso);
 372    cso_restore_fragment_samplers(cso);
 373    cso_restore_fragment_sampler_views(cso);
 374    cso_restore_viewport(cso);
 375    cso_restore_fragment_shader(cso);
 376    cso_restore_vertex_shader(cso);
 377    cso_restore_tessctrl_shader(cso);
 378    cso_restore_tesseval_shader(cso);
 379    cso_restore_geometry_shader(cso);
 380    cso_restore_vertex_elements(cso);
 381    cso_restore_aux_vertex_buffer_slot(cso);
 382    cso_restore_stream_outputs(cso);
 383 }
 384
 385
 386 /**
 387  * Render a glBitmap by drawing a textured quad
 388  */
 389 static void
 390 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 391                  GLsizei width, GLsizei height,
 392                  struct pipe_sampler_view *sv,
 393                  const GLfloat *color)
 394 {
 395    struct st_context *st = st_context(ctx);
 396    struct pipe_context *pipe = st->pipe;
 397    struct pipe_resource *vbuf = NULL;
 398    GLuint maxSize;
 399    GLuint offset;
 400
 401    /* limit checks */
 402    /* XXX if the bitmap is larger than the max texture size, break
 403     * it up into chunks.
 404     */
 405    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 406                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 407    assert(width <= (GLsizei)maxSize);
 408    assert(height <= (GLsizei)maxSize);
 409
 410    setup_render_state(ctx, sv, color);
 411
 412    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 413    z = z * 2.0f - 1.0f;
 414
 415    /* draw textured quad */
 416    setup_bitmap_vertex_data(st, sv->texture->target != PIPE_TEXTURE_RECT,
 417                             x, y, width, height, z, color, &vbuf, &offset);
 418
 419    if (vbuf) {
 420       util_draw_vertex_buffer(pipe, st->cso_context, vbuf,
 421                               cso_get_aux_vertex_buffer_slot(st->cso_context),
 422                               offset,
 423                               PIPE_PRIM_TRIANGLE_FAN,
 424                               4,  /* verts */
 425                               3); /* attribs/vert */
 426    }
 427
 428    restore_render_state(ctx);
 429
 430    pipe_resource_reference(&vbuf, NULL);
 431
 432    /* We uploaded modified constants, need to invalidate them. */
 433    st->dirty.mesa |= _NEW_PROGRAM_CONSTANTS;
 434 }
 435
 436
 437 static void
 438 reset_cache(struct st_context *st)
 439 {
 440    struct bitmap_cache *cache = st->bitmap.cache;
 441
 442    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 443    cache->empty = GL_TRUE;
 444
 445    cache->xmin = 1000000;
 446    cache->xmax = -1000000;
 447    cache->ymin = 1000000;
 448    cache->ymax = -1000000;
 449
 450    assert(!cache->texture);
 451
 452    /* allocate a new texture */
 453    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 454                                       st->bitmap.tex_format, 0,
 455                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 456                                       1, 1, 0,
 457                                       PIPE_BIND_SAMPLER_VIEW);
 458 }
 459
 460
 461 /** Print bitmap image to stdout (debug) */
 462 static void
 463 print_cache(const struct bitmap_cache *cache)
 464 {
 465    int i, j, k;
 466
 467    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 468       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 469       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 470          if (cache->buffer[k])
 471             printf("X");
 472          else
 473             printf(" ");
 474          k++;
 475       }
 476       printf("\n");
 477    }
 478 }
 479
 480
 481 /**
 482  * Create gallium pipe_transfer object for the bitmap cache.
 483  */
 484 static void
 485 create_cache_trans(struct st_context *st)
 486 {
 487    struct pipe_context *pipe = st->pipe;
 488    struct bitmap_cache *cache = st->bitmap.cache;
 489
 490    if (cache->trans)
 491       return;
 492
 493    /* Map the texture transfer.
 494     * Subsequent glBitmap calls will write into the texture image.
 495     */
 496    cache->buffer = pipe_transfer_map(pipe, cache->texture, 0, 0,
 497                                      PIPE_TRANSFER_WRITE, 0, 0,
 498                                      BITMAP_CACHE_WIDTH,
 499                                      BITMAP_CACHE_HEIGHT, &cache->trans);
 500
 501    /* init image to all 0xff */
 502    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 503 }
 504
 505
 506 /**
 507  * If there's anything in the bitmap cache, draw/flush it now.
 508  */
 509 void
 510 st_flush_bitmap_cache(struct st_context *st)
 511 {
 512    if (!st->bitmap.cache->empty) {
 513       struct bitmap_cache *cache = st->bitmap.cache;
 514       struct pipe_context *pipe = st->pipe;
 515       struct pipe_sampler_view *sv;
 516
 517       assert(cache->xmin <= cache->xmax);
 518
 519       if (0)
 520          printf("flush bitmap, size %d x %d  at %d, %d\n",
 521                 cache->xmax - cache->xmin,
 522                 cache->ymax - cache->ymin,
 523                 cache->xpos, cache->ypos);
 524
 525       /* The texture transfer has been mapped until now.
 526        * So unmap and release the texture transfer before drawing.
 527        */
 528       if (cache->trans && cache->buffer) {
 529          if (0)
 530             print_cache(cache);
 531          pipe_transfer_unmap(pipe, cache->trans);
 532          cache->buffer = NULL;
 533          cache->trans = NULL;
 534       }
 535
 536       sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 537       if (sv) {
 538          draw_bitmap_quad(st->ctx,
 539                           cache->xpos,
 540                           cache->ypos,
 541                           cache->zpos,
 542                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 543                           sv,
 544                           cache->color);
 545
 546          pipe_sampler_view_reference(&sv, NULL);
 547       }
 548
 549       /* release/free the texture */
 550       pipe_resource_reference(&cache->texture, NULL);
 551
 552       reset_cache(st);
 553    }
 554 }
 555
 556
 557 /**
 558  * Try to accumulate this glBitmap call in the bitmap cache.
 559  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 560  */
 561 static GLboolean
 562 accum_bitmap(struct gl_context *ctx,
 563              GLint x, GLint y, GLsizei width, GLsizei height,
 564              const struct gl_pixelstore_attrib *unpack,
 565              const GLubyte *bitmap )
 566 {
 567    struct st_context *st = ctx->st;
 568    struct bitmap_cache *cache = st->bitmap.cache;
 569    int px = -999, py = -999;
 570    const GLfloat z = st->ctx->Current.RasterPos[2];
 571
 572    if (width > BITMAP_CACHE_WIDTH ||
 573        height > BITMAP_CACHE_HEIGHT)
 574       return GL_FALSE; /* too big to cache */
 575
 576    if (!cache->empty) {
 577       px = x - cache->xpos;  /* pos in buffer */
 578       py = y - cache->ypos;
 579       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 580           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 581           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 582           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 583          /* This bitmap would extend beyond cache bounds, or the bitmap
 584           * color is changing
 585           * so flush and continue.
 586           */
 587          st_flush_bitmap_cache(st);
 588       }
 589    }
 590
 591    if (cache->empty) {
 592       /* Initialize.  Center bitmap vertically in the buffer. */
 593       px = 0;
 594       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 595       cache->xpos = x;
 596       cache->ypos = y - py;
 597       cache->zpos = z;
 598       cache->empty = GL_FALSE;
 599       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 600    }
 601
 602    assert(px != -999);
 603    assert(py != -999);
 604
 605    if (x < cache->xmin)
 606       cache->xmin = x;
 607    if (y < cache->ymin)
 608       cache->ymin = y;
 609    if (x + width > cache->xmax)
 610       cache->xmax = x + width;
 611    if (y + height > cache->ymax)
 612       cache->ymax = y + height;
 613
 614    /* create the transfer if needed */
 615    create_cache_trans(st);
 616
 617    /* PBO source... */
 618    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 619    if (!bitmap) {
 620       return FALSE;
 621    }
 622
 623    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 624                  cache->buffer, BITMAP_CACHE_WIDTH);
 625
 626    _mesa_unmap_pbo_source(ctx, unpack);
 627
 628    return GL_TRUE; /* accumulated */
 629 }
 630
 631
 632
 633 /**
 634  * Called via ctx->Driver.Bitmap()
 635  */
 636 static void
 637 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 638           GLsizei width, GLsizei height,
 639           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 640 {
 641    struct st_context *st = st_context(ctx);
 642    struct pipe_resource *pt;
 643
 644    assert(width > 0);
 645    assert(height > 0);
 646
 647    /* We only need to validate state of the st dirty flags are set or
 648     * any non-_NEW_PROGRAM_CONSTANTS mesa flags are set.  The VS we use
 649     * for bitmap drawing uses no constants and the FS constants are
 650     * explicitly uploaded in the draw_bitmap_quad() function.
 651     */
 652    if ((st->dirty.mesa & ~_NEW_PROGRAM_CONSTANTS) || st->dirty.st) {
 653       st_validate_state(st);
 654    }
 655
 656    if (!st->bitmap.vs) {
 657       /* create pass-through vertex shader now */
 658       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 659                                       TGSI_SEMANTIC_COLOR,
 660         st->needs_texcoord_semantic ? TGSI_SEMANTIC_TEXCOORD :
 661                                       TGSI_SEMANTIC_GENERIC };
 662       const uint semantic_indexes[] = { 0, 0, 0 };
 663       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 664                                                           semantic_names,
 665                                                           semantic_indexes,
 666                                                           FALSE);
 667    }
 668
 669    if (UseBitmapCache && accum_bitmap(ctx, x, y, width, height, unpack, bitmap))
 670       return;
 671
 672    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 673    if (pt) {
 674       struct pipe_sampler_view *sv =
 675          st_create_texture_sampler_view(st->pipe, pt);
 676
 677       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 678
 679       if (sv) {
 680          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 681                           width, height, sv,
 682                           st->ctx->Current.RasterColor);
 683
 684          pipe_sampler_view_reference(&sv, NULL);
 685       }
 686
 687       /* release/free the texture */
 688       pipe_resource_reference(&pt, NULL);
 689    }
 690 }
 691
 692
 693 /** Per-context init */
 694 void
 695 st_init_bitmap_functions(struct dd_function_table *functions)
 696 {
 697    functions->Bitmap = st_Bitmap;
 698 }
 699
 700
 701 /** Per-context init */
 702 void
 703 st_init_bitmap(struct st_context *st)
 704 {
 705    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 706    struct pipe_context *pipe = st->pipe;
 707    struct pipe_screen *screen = pipe->screen;
 708
 709    /* init sampler state once */
 710    memset(sampler, 0, sizeof(*sampler));
 711    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 712    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 713    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 714    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 715    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 716    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 717    st->bitmap.samplers[1] = *sampler;
 718    st->bitmap.samplers[1].normalized_coords = 1;
 719
 720    /* init baseline rasterizer state once */
 721    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 722    st->bitmap.rasterizer.half_pixel_center = 1;
 723    st->bitmap.rasterizer.bottom_edge_rule = 1;
 724    st->bitmap.rasterizer.depth_clip = 1;
 725
 726    /* find a usable texture format */
 727    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 728                                    PIPE_TEXTURE_2D, 0,
 729                                    PIPE_BIND_SAMPLER_VIEW)) {
 730       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 731    }
 732    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 733                                         PIPE_TEXTURE_2D, 0,
 734                                         PIPE_BIND_SAMPLER_VIEW)) {
 735       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 736    }
 737    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 738                                         PIPE_TEXTURE_2D, 0,
 739                                         PIPE_BIND_SAMPLER_VIEW)) {
 740       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 741    }
 742    else {
 743       /* XXX support more formats */
 744       assert(0);
 745    }
 746
 747    /* alloc bitmap cache object */
 748    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 749
 750    reset_cache(st);
 751 }
 752
 753
 754 /** Per-context tear-down */
 755 void
 756 st_destroy_bitmap(struct st_context *st)
 757 {
 758    struct pipe_context *pipe = st->pipe;
 759    struct bitmap_cache *cache = st->bitmap.cache;
 760
 761    if (st->bitmap.vs) {
 762       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 763       st->bitmap.vs = NULL;
 764    }
 765
 766    if (cache) {
 767       if (cache->trans && cache->buffer) {
 768          pipe_transfer_unmap(pipe, cache->trans);
 769       }
 770       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 771       free(st->bitmap.cache);
 772       st->bitmap.cache = NULL;
 773    }
 774 }