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/dlist.h"
  37 #include "main/macros.h"
  38 #include "main/pbo.h"
  39 #include "program/program.h"
  40 #include "program/prog_print.h"
  41
  42 #include "st_context.h"
  43 #include "st_atom.h"
  44 #include "st_atom_constbuf.h"
  45 #include "st_draw.h"
  46 #include "st_program.h"
  47 #include "st_cb_bitmap.h"
  48 #include "st_sampler_view.h"
  49 #include "st_texture.h"
  50
  51 #include "pipe/p_context.h"
  52 #include "pipe/p_defines.h"
  53 #include "pipe/p_shader_tokens.h"
  54 #include "util/u_inlines.h"
  55 #include "util/u_simple_shaders.h"
  56 #include "util/u_upload_mgr.h"
  57 #include "program/prog_instruction.h"
  58 #include "cso_cache/cso_context.h"
  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
  87 /** Epsilon for Z comparisons */
  88 #define Z_EPSILON 1e-06
  89
  90
  91 /**
  92  * Copy user-provide bitmap bits into texture buffer, expanding
  93  * bits into texels.
  94  * "On" bits will set texels to 0x0.
  95  * "Off" bits will not modify texels.
  96  * Note that the image is actually going to be upside down in
  97  * the texture.  We deal with that with texcoords.
  98  */
  99 static void
 100 unpack_bitmap(struct st_context *st,
 101               GLint px, GLint py, GLsizei width, GLsizei height,
 102               const struct gl_pixelstore_attrib *unpack,
 103               const GLubyte *bitmap,
 104               ubyte *destBuffer, uint destStride)
 105 {
 106    destBuffer += py * destStride + px;
 107
 108    _mesa_expand_bitmap(width, height, unpack, bitmap,
 109                        destBuffer, destStride, 0x0);
 110 }
 111
 112
 113 /**
 114  * Create a texture which represents a bitmap image.
 115  */
 116 static struct pipe_resource *
 117 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 118                     const struct gl_pixelstore_attrib *unpack,
 119                     const GLubyte *bitmap)
 120 {
 121    struct st_context *st = st_context(ctx);
 122    struct pipe_context *pipe = st->pipe;
 123    struct pipe_transfer *transfer;
 124    ubyte *dest;
 125    struct pipe_resource *pt;
 126
 127    /* PBO source... */
 128    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 129    if (!bitmap) {
 130       return NULL;
 131    }
 132
 133    /**
 134     * Create texture to hold bitmap pattern.
 135     */
 136    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 137                           0, width, height, 1, 1, 0,
 138                           PIPE_BIND_SAMPLER_VIEW);
 139    if (!pt) {
 140       _mesa_unmap_pbo_source(ctx, unpack);
 141       return NULL;
 142    }
 143
 144    dest = pipe_transfer_map(st->pipe, pt, 0, 0,
 145                             PIPE_TRANSFER_WRITE,
 146                             0, 0, width, height, &transfer);
 147
 148    /* Put image into texture transfer */
 149    memset(dest, 0xff, height * transfer->stride);
 150    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 151                  dest, transfer->stride);
 152
 153    _mesa_unmap_pbo_source(ctx, unpack);
 154
 155    /* Release transfer */
 156    pipe_transfer_unmap(pipe, transfer);
 157    return pt;
 158 }
 159
 160
 161 /**
 162  * Setup pipeline state prior to rendering the bitmap textured quad.
 163  */
 164 static void
 165 setup_render_state(struct gl_context *ctx,
 166                    struct pipe_sampler_view *sv,
 167                    const GLfloat *color,
 168                    bool atlas)
 169 {
 170    struct st_context *st = st_context(ctx);
 171    struct cso_context *cso = st->cso_context;
 172    struct st_fp_variant *fpv;
 173    struct st_fp_variant_key key;
 174
 175    memset(&key, 0, sizeof(key));
 176    key.st = st->has_shareable_shaders ? NULL : st;
 177    key.bitmap = GL_TRUE;
 178    key.clamp_color = st->clamp_frag_color_in_shader &&
 179                      ctx->Color._ClampFragmentColor;
 180
 181    fpv = st_get_fp_variant(st, st->fp, &key);
 182
 183    /* As an optimization, Mesa's fragment programs will sometimes get the
 184     * primary color from a statevar/constant rather than a varying variable.
 185     * when that's the case, we need to ensure that we use the 'color'
 186     * parameter and not the current attribute color (which may have changed
 187     * through glRasterPos and state validation.
 188     * So, we force the proper color here.  Not elegant, but it works.
 189     */
 190    {
 191       GLfloat colorSave[4];
 192       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 193       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 194       st_upload_constants(st, st->fp->Base.Parameters, MESA_SHADER_FRAGMENT);
 195       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 196    }
 197
 198    cso_save_state(cso, (CSO_BIT_RASTERIZER |
 199                         CSO_BIT_FRAGMENT_SAMPLERS |
 200                         CSO_BIT_FRAGMENT_SAMPLER_VIEWS |
 201                         CSO_BIT_VIEWPORT |
 202                         CSO_BIT_STREAM_OUTPUTS |
 203                         CSO_BIT_VERTEX_ELEMENTS |
 204                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
 205                         CSO_BITS_ALL_SHADERS));
 206
 207
 208    /* rasterizer state: just scissor */
 209    st->bitmap.rasterizer.scissor = ctx->Scissor.EnableFlags & 1;
 210    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 211
 212    /* fragment shader state: TEX lookup program */
 213    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 214
 215    /* vertex shader state: position + texcoord pass-through */
 216    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 217
 218    /* disable other shaders */
 219    cso_set_tessctrl_shader_handle(cso, NULL);
 220    cso_set_tesseval_shader_handle(cso, NULL);
 221    cso_set_geometry_shader_handle(cso, NULL);
 222
 223    /* user samplers, plus our bitmap sampler */
 224    {
 225       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 226       uint num = MAX2(fpv->bitmap_sampler + 1,
 227                       st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 228       uint i;
 229       for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
 230          samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
 231       }
 232       if (atlas)
 233          samplers[fpv->bitmap_sampler] = &st->bitmap.atlas_sampler;
 234       else
 235          samplers[fpv->bitmap_sampler] = &st->bitmap.sampler;
 236       cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
 237                        (const struct pipe_sampler_state **) samplers);
 238    }
 239
 240    /* user textures, plus the bitmap texture */
 241    {
 242       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 243       uint num = MAX2(fpv->bitmap_sampler + 1,
 244                       st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 245       memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 246              sizeof(sampler_views));
 247       sampler_views[fpv->bitmap_sampler] = sv;
 248       cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);
 249    }
 250
 251    /* viewport state: viewport matching window dims */
 252    cso_set_viewport_dims(cso, st->state.framebuffer.width,
 253                          st->state.framebuffer.height,
 254                          st->state.fb_orientation == Y_0_TOP);
 255
 256    cso_set_vertex_elements(cso, 3, st->util_velems);
 257
 258    cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
 259 }
 260
 261
 262 /**
 263  * Restore pipeline state after rendering the bitmap textured quad.
 264  */
 265 static void
 266 restore_render_state(struct gl_context *ctx)
 267 {
 268    struct st_context *st = st_context(ctx);
 269    struct cso_context *cso = st->cso_context;
 270
 271    cso_restore_state(cso);
 272 }
 273
 274
 275 /**
 276  * Render a glBitmap by drawing a textured quad
 277  */
 278 static void
 279 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 280                  GLsizei width, GLsizei height,
 281                  struct pipe_sampler_view *sv,
 282                  const GLfloat *color)
 283 {
 284    struct st_context *st = st_context(ctx);
 285    struct pipe_context *pipe = st->pipe;
 286    const float fb_width = (float) st->state.framebuffer.width;
 287    const float fb_height = (float) st->state.framebuffer.height;
 288    const float x0 = (float) x;
 289    const float x1 = (float) (x + width);
 290    const float y0 = (float) y;
 291    const float y1 = (float) (y + height);
 292    float sLeft = 0.0f, sRight = 1.0f;
 293    float tTop = 0.0f, tBot = 1.0f - tTop;
 294    const float clip_x0 = x0 / fb_width * 2.0f - 1.0f;
 295    const float clip_y0 = y0 / fb_height * 2.0f - 1.0f;
 296    const float clip_x1 = x1 / fb_width * 2.0f - 1.0f;
 297    const float clip_y1 = y1 / fb_height * 2.0f - 1.0f;
 298
 299    /* limit checks */
 300    {
 301       /* XXX if the bitmap is larger than the max texture size, break
 302        * it up into chunks.
 303        */
 304       GLuint maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 305                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 306       assert(width <= (GLsizei) maxSize);
 307       assert(height <= (GLsizei) maxSize);
 308    }
 309
 310    setup_render_state(ctx, sv, color, false);
 311
 312    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 313    z = z * 2.0f - 1.0f;
 314
 315    if (sv->texture->target == PIPE_TEXTURE_RECT) {
 316       /* use non-normalized texcoords */
 317       sRight = (float) width;
 318       tBot = (float) height;
 319    }
 320
 321    if (!st_draw_quad(st, clip_x0, clip_y0, clip_x1, clip_y1, z,
 322                      sLeft, tBot, sRight, tTop, color, 0)) {
 323       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBitmap");
 324    }
 325
 326    restore_render_state(ctx);
 327
 328    /* We uploaded modified constants, need to invalidate them. */
 329    st->dirty |= ST_NEW_FS_CONSTANTS;
 330 }
 331
 332
 333 static void
 334 reset_cache(struct st_context *st)
 335 {
 336    struct st_bitmap_cache *cache = &st->bitmap.cache;
 337
 338    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 339    cache->empty = GL_TRUE;
 340
 341    cache->xmin = 1000000;
 342    cache->xmax = -1000000;
 343    cache->ymin = 1000000;
 344    cache->ymax = -1000000;
 345
 346    assert(!cache->texture);
 347
 348    /* allocate a new texture */
 349    cache->texture = st_texture_create(st, st->internal_target,
 350                                       st->bitmap.tex_format, 0,
 351                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 352                                       1, 1, 0,
 353                                       PIPE_BIND_SAMPLER_VIEW);
 354 }
 355
 356
 357 /** Print bitmap image to stdout (debug) */
 358 static void
 359 print_cache(const struct st_bitmap_cache *cache)
 360 {
 361    int i, j, k;
 362
 363    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 364       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 365       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 366          if (cache->buffer[k])
 367             printf("X");
 368          else
 369             printf(" ");
 370          k++;
 371       }
 372       printf("\n");
 373    }
 374 }
 375
 376
 377 /**
 378  * Create gallium pipe_transfer object for the bitmap cache.
 379  */
 380 static void
 381 create_cache_trans(struct st_context *st)
 382 {
 383    struct pipe_context *pipe = st->pipe;
 384    struct st_bitmap_cache *cache = &st->bitmap.cache;
 385
 386    if (cache->trans)
 387       return;
 388
 389    /* Map the texture transfer.
 390     * Subsequent glBitmap calls will write into the texture image.
 391     */
 392    cache->buffer = pipe_transfer_map(pipe, cache->texture, 0, 0,
 393                                      PIPE_TRANSFER_WRITE, 0, 0,
 394                                      BITMAP_CACHE_WIDTH,
 395                                      BITMAP_CACHE_HEIGHT, &cache->trans);
 396
 397    /* init image to all 0xff */
 398    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 399 }
 400
 401
 402 /**
 403  * If there's anything in the bitmap cache, draw/flush it now.
 404  */
 405 void
 406 st_flush_bitmap_cache(struct st_context *st)
 407 {
 408    struct st_bitmap_cache *cache = &st->bitmap.cache;
 409
 410    if (!cache->empty) {
 411       struct pipe_context *pipe = st->pipe;
 412       struct pipe_sampler_view *sv;
 413
 414       assert(cache->xmin <= cache->xmax);
 415
 416       if (0)
 417          printf("flush bitmap, size %d x %d  at %d, %d\n",
 418                 cache->xmax - cache->xmin,
 419                 cache->ymax - cache->ymin,
 420                 cache->xpos, cache->ypos);
 421
 422       /* The texture transfer has been mapped until now.
 423        * So unmap and release the texture transfer before drawing.
 424        */
 425       if (cache->trans && cache->buffer) {
 426          if (0)
 427             print_cache(cache);
 428          pipe_transfer_unmap(pipe, cache->trans);
 429          cache->buffer = NULL;
 430          cache->trans = NULL;
 431       }
 432
 433       sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 434       if (sv) {
 435          draw_bitmap_quad(st->ctx,
 436                           cache->xpos,
 437                           cache->ypos,
 438                           cache->zpos,
 439                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 440                           sv,
 441                           cache->color);
 442
 443          pipe_sampler_view_reference(&sv, NULL);
 444       }
 445
 446       /* release/free the texture */
 447       pipe_resource_reference(&cache->texture, NULL);
 448
 449       reset_cache(st);
 450    }
 451 }
 452
 453
 454 /**
 455  * Try to accumulate this glBitmap call in the bitmap cache.
 456  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 457  */
 458 static GLboolean
 459 accum_bitmap(struct gl_context *ctx,
 460              GLint x, GLint y, GLsizei width, GLsizei height,
 461              const struct gl_pixelstore_attrib *unpack,
 462              const GLubyte *bitmap )
 463 {
 464    struct st_context *st = ctx->st;
 465    struct st_bitmap_cache *cache = &st->bitmap.cache;
 466    int px = -999, py = -999;
 467    const GLfloat z = ctx->Current.RasterPos[2];
 468
 469    if (width > BITMAP_CACHE_WIDTH ||
 470        height > BITMAP_CACHE_HEIGHT)
 471       return GL_FALSE; /* too big to cache */
 472
 473    if (!cache->empty) {
 474       px = x - cache->xpos;  /* pos in buffer */
 475       py = y - cache->ypos;
 476       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 477           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 478           !TEST_EQ_4V(ctx->Current.RasterColor, cache->color) ||
 479           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 480          /* This bitmap would extend beyond cache bounds, or the bitmap
 481           * color is changing
 482           * so flush and continue.
 483           */
 484          st_flush_bitmap_cache(st);
 485       }
 486    }
 487
 488    if (cache->empty) {
 489       /* Initialize.  Center bitmap vertically in the buffer. */
 490       px = 0;
 491       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 492       cache->xpos = x;
 493       cache->ypos = y - py;
 494       cache->zpos = z;
 495       cache->empty = GL_FALSE;
 496       COPY_4FV(cache->color, ctx->Current.RasterColor);
 497    }
 498
 499    assert(px != -999);
 500    assert(py != -999);
 501
 502    if (x < cache->xmin)
 503       cache->xmin = x;
 504    if (y < cache->ymin)
 505       cache->ymin = y;
 506    if (x + width > cache->xmax)
 507       cache->xmax = x + width;
 508    if (y + height > cache->ymax)
 509       cache->ymax = y + height;
 510
 511    /* create the transfer if needed */
 512    create_cache_trans(st);
 513
 514    /* PBO source... */
 515    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 516    if (!bitmap) {
 517       return FALSE;
 518    }
 519
 520    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 521                  cache->buffer, BITMAP_CACHE_WIDTH);
 522
 523    _mesa_unmap_pbo_source(ctx, unpack);
 524
 525    return GL_TRUE; /* accumulated */
 526 }
 527
 528
 529 /**
 530  * One-time init for drawing bitmaps.
 531  */
 532 static void
 533 init_bitmap_state(struct st_context *st)
 534 {
 535    struct pipe_context *pipe = st->pipe;
 536    struct pipe_screen *screen = pipe->screen;
 537
 538    /* This function should only be called once */
 539    assert(st->bitmap.vs == NULL);
 540
 541    assert(st->internal_target == PIPE_TEXTURE_2D ||
 542           st->internal_target == PIPE_TEXTURE_RECT);
 543
 544    /* init sampler state once */
 545    memset(&st->bitmap.sampler, 0, sizeof(st->bitmap.sampler));
 546    st->bitmap.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;
 547    st->bitmap.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;
 548    st->bitmap.sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;
 549    st->bitmap.sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 550    st->bitmap.sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 551    st->bitmap.sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 552    st->bitmap.sampler.normalized_coords = st->internal_target == PIPE_TEXTURE_2D;
 553
 554    st->bitmap.atlas_sampler = st->bitmap.sampler;
 555    st->bitmap.atlas_sampler.normalized_coords = 0;
 556
 557    /* init baseline rasterizer state once */
 558    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 559    st->bitmap.rasterizer.half_pixel_center = 1;
 560    st->bitmap.rasterizer.bottom_edge_rule = 1;
 561    st->bitmap.rasterizer.depth_clip = 1;
 562
 563    /* find a usable texture format */
 564    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 565                                    st->internal_target, 0,
 566                                    PIPE_BIND_SAMPLER_VIEW)) {
 567       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 568    }
 569    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 570                                         st->internal_target, 0,
 571                                         PIPE_BIND_SAMPLER_VIEW)) {
 572       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 573    }
 574    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 575                                         st->internal_target, 0,
 576                                         PIPE_BIND_SAMPLER_VIEW)) {
 577       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 578    }
 579    else {
 580       /* XXX support more formats */
 581       assert(0);
 582    }
 583
 584    /* Create the vertex shader */
 585    {
 586       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 587                                       TGSI_SEMANTIC_COLOR,
 588         st->needs_texcoord_semantic ? TGSI_SEMANTIC_TEXCOORD :
 589                                       TGSI_SEMANTIC_GENERIC };
 590       const uint semantic_indexes[] = { 0, 0, 0 };
 591       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 592                                                           semantic_names,
 593                                                           semantic_indexes,
 594                                                           FALSE);
 595    }
 596
 597    reset_cache(st);
 598 }
 599
 600
 601 /**
 602  * Called via ctx->Driver.Bitmap()
 603  */
 604 static void
 605 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 606           GLsizei width, GLsizei height,
 607           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 608 {
 609    struct st_context *st = st_context(ctx);
 610    struct pipe_resource *pt;
 611
 612    assert(width > 0);
 613    assert(height > 0);
 614
 615    st_invalidate_readpix_cache(st);
 616
 617    if (!st->bitmap.vs) {
 618       init_bitmap_state(st);
 619    }
 620
 621    /* We only need to validate any non-ST_NEW_CONSTANTS state. The VS we use
 622     * for bitmap drawing uses no constants and the FS constants are
 623     * explicitly uploaded in the draw_bitmap_quad() function.
 624     */
 625    if ((st->dirty | ctx->NewDriverState) & ~ST_NEW_CONSTANTS &
 626        ST_PIPELINE_RENDER_STATE_MASK ||
 627        st->gfx_shaders_may_be_dirty) {
 628       st_validate_state(st, ST_PIPELINE_RENDER);
 629    }
 630
 631    if (UseBitmapCache && accum_bitmap(ctx, x, y, width, height, unpack, bitmap))
 632       return;
 633
 634    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 635    if (pt) {
 636       struct pipe_sampler_view *sv =
 637          st_create_texture_sampler_view(st->pipe, pt);
 638
 639       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 640
 641       if (sv) {
 642          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 643                           width, height, sv, ctx->Current.RasterColor);
 644
 645          pipe_sampler_view_reference(&sv, NULL);
 646       }
 647
 648       /* release/free the texture */
 649       pipe_resource_reference(&pt, NULL);
 650    }
 651 }
 652
 653
 654 /**
 655  * Called via ctx->Driver.DrawAtlasBitmap()
 656  */
 657 static void
 658 st_DrawAtlasBitmaps(struct gl_context *ctx,
 659                     const struct gl_bitmap_atlas *atlas,
 660                     GLuint count, const GLubyte *ids)
 661 {
 662    struct st_context *st = st_context(ctx);
 663    struct pipe_context *pipe = st->pipe;
 664    struct st_texture_object *stObj = st_texture_object(atlas->texObj);
 665    struct pipe_sampler_view *sv;
 666    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 667    const float z = ctx->Current.RasterPos[2] * 2.0f - 1.0f;
 668    const float *color = ctx->Current.RasterColor;
 669    const float clip_x_scale = 2.0f / st->state.framebuffer.width;
 670    const float clip_y_scale = 2.0f / st->state.framebuffer.height;
 671    const unsigned num_verts = count * 4;
 672    const unsigned num_vert_bytes = num_verts * sizeof(struct st_util_vertex);
 673    struct st_util_vertex *verts;
 674    struct pipe_vertex_buffer vb = {0};
 675    unsigned i;
 676
 677    if (!st->bitmap.vs) {
 678       init_bitmap_state(st);
 679    }
 680
 681    st_flush_bitmap_cache(st);
 682
 683    st_validate_state(st, ST_PIPELINE_RENDER);
 684    st_invalidate_readpix_cache(st);
 685
 686    sv = st_create_texture_sampler_view(pipe, stObj->pt);
 687    if (!sv) {
 688       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCallLists(bitmap text)");
 689       return;
 690    }
 691
 692    setup_render_state(ctx, sv, color, true);
 693
 694    vb.stride = sizeof(struct st_util_vertex);
 695
 696    u_upload_alloc(pipe->stream_uploader, 0, num_vert_bytes, 4,
 697                   &vb.buffer_offset, &vb.buffer, (void **) &verts);
 698
 699    if (unlikely(!verts)) {
 700       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCallLists(bitmap text)");
 701       goto out;
 702    }
 703
 704    /* build quads vertex data */
 705    for (i = 0; i < count; i++) {
 706       const GLfloat epsilon = 0.0001F;
 707       const struct gl_bitmap_glyph *g = &atlas->glyphs[ids[i]];
 708       const float xmove = g->xmove, ymove = g->ymove;
 709       const float xorig = g->xorig, yorig = g->yorig;
 710       const float s0 = g->x, t0 = g->y;
 711       const float s1 = s0 + g->w, t1 = t0 + g->h;
 712       const float x0 = IFLOOR(ctx->Current.RasterPos[0] - xorig + epsilon);
 713       const float y0 = IFLOOR(ctx->Current.RasterPos[1] - yorig + epsilon);
 714       const float x1 = x0 + g->w, y1 = y0 + g->h;
 715       const float clip_x0 = x0 * clip_x_scale - 1.0f;
 716       const float clip_y0 = y0 * clip_y_scale - 1.0f;
 717       const float clip_x1 = x1 * clip_x_scale - 1.0f;
 718       const float clip_y1 = y1 * clip_y_scale - 1.0f;
 719
 720       /* lower-left corner */
 721       verts->x = clip_x0;
 722       verts->y = clip_y0;
 723       verts->z = z;
 724       verts->r = color[0];
 725       verts->g = color[1];
 726       verts->b = color[2];
 727       verts->a = color[3];
 728       verts->s = s0;
 729       verts->t = t0;
 730       verts++;
 731
 732       /* lower-right corner */
 733       verts->x = clip_x1;
 734       verts->y = clip_y0;
 735       verts->z = z;
 736       verts->r = color[0];
 737       verts->g = color[1];
 738       verts->b = color[2];
 739       verts->a = color[3];
 740       verts->s = s1;
 741       verts->t = t0;
 742       verts++;
 743
 744       /* upper-right corner */
 745       verts->x = clip_x1;
 746       verts->y = clip_y1;
 747       verts->z = z;
 748       verts->r = color[0];
 749       verts->g = color[1];
 750       verts->b = color[2];
 751       verts->a = color[3];
 752       verts->s = s1;
 753       verts->t = t1;
 754       verts++;
 755
 756       /* upper-left corner */
 757       verts->x = clip_x0;
 758       verts->y = clip_y1;
 759       verts->z = z;
 760       verts->r = color[0];
 761       verts->g = color[1];
 762       verts->b = color[2];
 763       verts->a = color[3];
 764       verts->s = s0;
 765       verts->t = t1;
 766       verts++;
 767
 768       /* Update the raster position */
 769       ctx->Current.RasterPos[0] += xmove;
 770       ctx->Current.RasterPos[1] += ymove;
 771    }
 772
 773    u_upload_unmap(pipe->stream_uploader);
 774
 775    cso_set_vertex_buffers(st->cso_context,
 776                           cso_get_aux_vertex_buffer_slot(st->cso_context),
 777                           1, &vb);
 778
 779    cso_draw_arrays(st->cso_context, PIPE_PRIM_QUADS, 0, num_verts);
 780
 781 out:
 782    restore_render_state(ctx);
 783
 784    pipe_resource_reference(&vb.buffer, NULL);
 785
 786    pipe_sampler_view_reference(&sv, NULL);
 787
 788    /* We uploaded modified constants, need to invalidate them. */
 789    st->dirty |= ST_NEW_FS_CONSTANTS;
 790 }
 791
 792
 793
 794 /** Per-context init */
 795 void
 796 st_init_bitmap_functions(struct dd_function_table *functions)
 797 {
 798    functions->Bitmap = st_Bitmap;
 799    functions->DrawAtlasBitmaps = st_DrawAtlasBitmaps;
 800 }
 801
 802
 803 /** Per-context tear-down */
 804 void
 805 st_destroy_bitmap(struct st_context *st)
 806 {
 807    struct pipe_context *pipe = st->pipe;
 808    struct st_bitmap_cache *cache = &st->bitmap.cache;
 809
 810    if (st->bitmap.vs) {
 811       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 812       st->bitmap.vs = NULL;
 813    }
 814
 815    if (cache->trans && cache->buffer) {
 816       pipe_transfer_unmap(pipe, cache->trans);
 817    }
 818    pipe_resource_reference(&st->bitmap.cache.texture, NULL);
 819 }