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_texture.h"
  49
  50 #include "pipe/p_context.h"
  51 #include "pipe/p_defines.h"
  52 #include "pipe/p_shader_tokens.h"
  53 #include "util/u_inlines.h"
  54 #include "util/u_simple_shaders.h"
  55 #include "util/u_upload_mgr.h"
  56 #include "program/prog_instruction.h"
  57 #include "cso_cache/cso_context.h"
  58
  59
  60 /**
  61  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  62  * is stored in a texture image.  An alpha8 texture format is used.
  63  * The fragment shader samples a bit (texel) from the texture, then
  64  * discards the fragment if the bit is off.
  65  *
  66  * Note that we actually store the inverse image of the bitmap to
  67  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  68  * and an "off" bit is stored as texel=0xff.  Then we kill the
  69  * fragment if the negated texel value is less than zero.
  70  */
  71
  72
  73 /**
  74  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  75  * buffer which is then rendered en mass upon a flush, state change, etc.
  76  * A wide, short buffer is used to target the common case of a series
  77  * of glBitmap calls being used to draw text.
  78  */
  79 static GLboolean UseBitmapCache = GL_TRUE;
  80
  81
  82 #define BITMAP_CACHE_WIDTH  512
  83 #define BITMAP_CACHE_HEIGHT 32
  84
  85 struct bitmap_cache
  86 {
  87    /** Window pos to render the cached image */
  88    GLint xpos, ypos;
  89    /** Bounds of region used in window coords */
  90    GLint xmin, ymin, xmax, ymax;
  91
  92    GLfloat color[4];
  93
  94    /** Bitmap's Z position */
  95    GLfloat zpos;
  96
  97    struct pipe_resource *texture;
  98    struct pipe_transfer *trans;
  99
 100    GLboolean empty;
 101
 102    /** An I8 texture image: */
 103    ubyte *buffer;
 104 };
 105
 106
 107 /** Epsilon for Z comparisons */
 108 #define Z_EPSILON 1e-06
 109
 110
 111 /**
 112  * Copy user-provide bitmap bits into texture buffer, expanding
 113  * bits into texels.
 114  * "On" bits will set texels to 0x0.
 115  * "Off" bits will not modify texels.
 116  * Note that the image is actually going to be upside down in
 117  * the texture.  We deal with that with texcoords.
 118  */
 119 static void
 120 unpack_bitmap(struct st_context *st,
 121               GLint px, GLint py, GLsizei width, GLsizei height,
 122               const struct gl_pixelstore_attrib *unpack,
 123               const GLubyte *bitmap,
 124               ubyte *destBuffer, uint destStride)
 125 {
 126    destBuffer += py * destStride + px;
 127
 128    _mesa_expand_bitmap(width, height, unpack, bitmap,
 129                        destBuffer, destStride, 0x0);
 130 }
 131
 132
 133 /**
 134  * Create a texture which represents a bitmap image.
 135  */
 136 static struct pipe_resource *
 137 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 138                     const struct gl_pixelstore_attrib *unpack,
 139                     const GLubyte *bitmap)
 140 {
 141    struct st_context *st = st_context(ctx);
 142    struct pipe_context *pipe = st->pipe;
 143    struct pipe_transfer *transfer;
 144    ubyte *dest;
 145    struct pipe_resource *pt;
 146
 147    /* PBO source... */
 148    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 149    if (!bitmap) {
 150       return NULL;
 151    }
 152
 153    /**
 154     * Create texture to hold bitmap pattern.
 155     */
 156    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 157                           0, width, height, 1, 1, 0,
 158                           PIPE_BIND_SAMPLER_VIEW);
 159    if (!pt) {
 160       _mesa_unmap_pbo_source(ctx, unpack);
 161       return NULL;
 162    }
 163
 164    dest = pipe_transfer_map(st->pipe, pt, 0, 0,
 165                             PIPE_TRANSFER_WRITE,
 166                             0, 0, width, height, &transfer);
 167
 168    /* Put image into texture transfer */
 169    memset(dest, 0xff, height * transfer->stride);
 170    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 171                  dest, transfer->stride);
 172
 173    _mesa_unmap_pbo_source(ctx, unpack);
 174
 175    /* Release transfer */
 176    pipe_transfer_unmap(pipe, transfer);
 177    return pt;
 178 }
 179
 180
 181 /**
 182  * Setup pipeline state prior to rendering the bitmap textured quad.
 183  */
 184 static void
 185 setup_render_state(struct gl_context *ctx,
 186                    struct pipe_sampler_view *sv,
 187                    const GLfloat *color,
 188                    bool atlas)
 189 {
 190    struct st_context *st = st_context(ctx);
 191    struct cso_context *cso = st->cso_context;
 192    struct st_fp_variant *fpv;
 193    struct st_fp_variant_key key;
 194
 195    memset(&key, 0, sizeof(key));
 196    key.st = st->has_shareable_shaders ? NULL : st;
 197    key.bitmap = GL_TRUE;
 198    key.clamp_color = st->clamp_frag_color_in_shader &&
 199                      ctx->Color._ClampFragmentColor;
 200
 201    fpv = st_get_fp_variant(st, st->fp, &key);
 202
 203    /* As an optimization, Mesa's fragment programs will sometimes get the
 204     * primary color from a statevar/constant rather than a varying variable.
 205     * when that's the case, we need to ensure that we use the 'color'
 206     * parameter and not the current attribute color (which may have changed
 207     * through glRasterPos and state validation.
 208     * So, we force the proper color here.  Not elegant, but it works.
 209     */
 210    {
 211       GLfloat colorSave[4];
 212       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 213       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 214       st_upload_constants(st, st->fp->Base.Base.Parameters,
 215                           PIPE_SHADER_FRAGMENT);
 216       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 217    }
 218
 219    cso_save_state(cso, (CSO_BIT_RASTERIZER |
 220                         CSO_BIT_FRAGMENT_SAMPLERS |
 221                         CSO_BIT_FRAGMENT_SAMPLER_VIEWS |
 222                         CSO_BIT_VIEWPORT |
 223                         CSO_BIT_STREAM_OUTPUTS |
 224                         CSO_BIT_VERTEX_ELEMENTS |
 225                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
 226                         CSO_BITS_ALL_SHADERS));
 227
 228
 229    /* rasterizer state: just scissor */
 230    st->bitmap.rasterizer.scissor = ctx->Scissor.EnableFlags & 1;
 231    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 232
 233    /* fragment shader state: TEX lookup program */
 234    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 235
 236    /* vertex shader state: position + texcoord pass-through */
 237    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 238
 239    /* disable other shaders */
 240    cso_set_tessctrl_shader_handle(cso, NULL);
 241    cso_set_tesseval_shader_handle(cso, NULL);
 242    cso_set_geometry_shader_handle(cso, NULL);
 243
 244    /* user samplers, plus our bitmap sampler */
 245    {
 246       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 247       uint num = MAX2(fpv->bitmap_sampler + 1,
 248                       st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 249       uint i;
 250       for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
 251          samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
 252       }
 253       if (atlas)
 254          samplers[fpv->bitmap_sampler] = &st->bitmap.atlas_sampler;
 255       else
 256          samplers[fpv->bitmap_sampler] = &st->bitmap.sampler;
 257       cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
 258                        (const struct pipe_sampler_state **) samplers);
 259    }
 260
 261    /* user textures, plus the bitmap texture */
 262    {
 263       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 264       uint num = MAX2(fpv->bitmap_sampler + 1,
 265                       st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 266       memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 267              sizeof(sampler_views));
 268       sampler_views[fpv->bitmap_sampler] = sv;
 269       cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);
 270    }
 271
 272    /* viewport state: viewport matching window dims */
 273    cso_set_viewport_dims(cso, st->state.framebuffer.width,
 274                          st->state.framebuffer.height,
 275                          st->state.fb_orientation == Y_0_TOP);
 276
 277    cso_set_vertex_elements(cso, 3, st->util_velems);
 278
 279    cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
 280 }
 281
 282
 283 /**
 284  * Restore pipeline state after rendering the bitmap textured quad.
 285  */
 286 static void
 287 restore_render_state(struct gl_context *ctx)
 288 {
 289    struct st_context *st = st_context(ctx);
 290    struct cso_context *cso = st->cso_context;
 291
 292    cso_restore_state(cso);
 293 }
 294
 295
 296 /**
 297  * Render a glBitmap by drawing a textured quad
 298  */
 299 static void
 300 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 301                  GLsizei width, GLsizei height,
 302                  struct pipe_sampler_view *sv,
 303                  const GLfloat *color)
 304 {
 305    struct st_context *st = st_context(ctx);
 306    struct pipe_context *pipe = st->pipe;
 307    const float fb_width = (float) st->state.framebuffer.width;
 308    const float fb_height = (float) st->state.framebuffer.height;
 309    const float x0 = (float) x;
 310    const float x1 = (float) (x + width);
 311    const float y0 = (float) y;
 312    const float y1 = (float) (y + height);
 313    float sLeft = 0.0f, sRight = 1.0f;
 314    float tTop = 0.0f, tBot = 1.0f - tTop;
 315    const float clip_x0 = x0 / fb_width * 2.0f - 1.0f;
 316    const float clip_y0 = y0 / fb_height * 2.0f - 1.0f;
 317    const float clip_x1 = x1 / fb_width * 2.0f - 1.0f;
 318    const float clip_y1 = y1 / fb_height * 2.0f - 1.0f;
 319
 320    /* limit checks */
 321    {
 322       /* XXX if the bitmap is larger than the max texture size, break
 323        * it up into chunks.
 324        */
 325       GLuint maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 326                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 327       assert(width <= (GLsizei) maxSize);
 328       assert(height <= (GLsizei) maxSize);
 329    }
 330
 331    setup_render_state(ctx, sv, color, false);
 332
 333    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 334    z = z * 2.0f - 1.0f;
 335
 336    if (sv->texture->target == PIPE_TEXTURE_RECT) {
 337       /* use non-normalized texcoords */
 338       sRight = (float) width;
 339       tBot = (float) height;
 340    }
 341
 342    if (!st_draw_quad(st, clip_x0, clip_y0, clip_x1, clip_y1, z,
 343                      sLeft, tBot, sRight, tTop, color, 0)) {
 344       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBitmap");
 345    }
 346
 347    restore_render_state(ctx);
 348
 349    /* We uploaded modified constants, need to invalidate them. */
 350    st->dirty.mesa |= _NEW_PROGRAM_CONSTANTS;
 351 }
 352
 353
 354 static void
 355 reset_cache(struct st_context *st)
 356 {
 357    struct bitmap_cache *cache = st->bitmap.cache;
 358
 359    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 360    cache->empty = GL_TRUE;
 361
 362    cache->xmin = 1000000;
 363    cache->xmax = -1000000;
 364    cache->ymin = 1000000;
 365    cache->ymax = -1000000;
 366
 367    assert(!cache->texture);
 368
 369    /* allocate a new texture */
 370    cache->texture = st_texture_create(st, st->internal_target,
 371                                       st->bitmap.tex_format, 0,
 372                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 373                                       1, 1, 0,
 374                                       PIPE_BIND_SAMPLER_VIEW);
 375 }
 376
 377
 378 /** Print bitmap image to stdout (debug) */
 379 static void
 380 print_cache(const struct bitmap_cache *cache)
 381 {
 382    int i, j, k;
 383
 384    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 385       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 386       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 387          if (cache->buffer[k])
 388             printf("X");
 389          else
 390             printf(" ");
 391          k++;
 392       }
 393       printf("\n");
 394    }
 395 }
 396
 397
 398 /**
 399  * Create gallium pipe_transfer object for the bitmap cache.
 400  */
 401 static void
 402 create_cache_trans(struct st_context *st)
 403 {
 404    struct pipe_context *pipe = st->pipe;
 405    struct bitmap_cache *cache = st->bitmap.cache;
 406
 407    if (cache->trans)
 408       return;
 409
 410    /* Map the texture transfer.
 411     * Subsequent glBitmap calls will write into the texture image.
 412     */
 413    cache->buffer = pipe_transfer_map(pipe, cache->texture, 0, 0,
 414                                      PIPE_TRANSFER_WRITE, 0, 0,
 415                                      BITMAP_CACHE_WIDTH,
 416                                      BITMAP_CACHE_HEIGHT, &cache->trans);
 417
 418    /* init image to all 0xff */
 419    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 420 }
 421
 422
 423 /**
 424  * If there's anything in the bitmap cache, draw/flush it now.
 425  */
 426 void
 427 st_flush_bitmap_cache(struct st_context *st)
 428 {
 429    struct bitmap_cache *cache = st->bitmap.cache;
 430
 431    if (cache && !cache->empty) {
 432       struct pipe_context *pipe = st->pipe;
 433       struct pipe_sampler_view *sv;
 434
 435       assert(cache->xmin <= cache->xmax);
 436
 437       if (0)
 438          printf("flush bitmap, size %d x %d  at %d, %d\n",
 439                 cache->xmax - cache->xmin,
 440                 cache->ymax - cache->ymin,
 441                 cache->xpos, cache->ypos);
 442
 443       /* The texture transfer has been mapped until now.
 444        * So unmap and release the texture transfer before drawing.
 445        */
 446       if (cache->trans && cache->buffer) {
 447          if (0)
 448             print_cache(cache);
 449          pipe_transfer_unmap(pipe, cache->trans);
 450          cache->buffer = NULL;
 451          cache->trans = NULL;
 452       }
 453
 454       sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 455       if (sv) {
 456          draw_bitmap_quad(st->ctx,
 457                           cache->xpos,
 458                           cache->ypos,
 459                           cache->zpos,
 460                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 461                           sv,
 462                           cache->color);
 463
 464          pipe_sampler_view_reference(&sv, NULL);
 465       }
 466
 467       /* release/free the texture */
 468       pipe_resource_reference(&cache->texture, NULL);
 469
 470       reset_cache(st);
 471    }
 472 }
 473
 474
 475 /**
 476  * Try to accumulate this glBitmap call in the bitmap cache.
 477  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 478  */
 479 static GLboolean
 480 accum_bitmap(struct gl_context *ctx,
 481              GLint x, GLint y, GLsizei width, GLsizei height,
 482              const struct gl_pixelstore_attrib *unpack,
 483              const GLubyte *bitmap )
 484 {
 485    struct st_context *st = ctx->st;
 486    struct bitmap_cache *cache = st->bitmap.cache;
 487    int px = -999, py = -999;
 488    const GLfloat z = ctx->Current.RasterPos[2];
 489
 490    if (width > BITMAP_CACHE_WIDTH ||
 491        height > BITMAP_CACHE_HEIGHT)
 492       return GL_FALSE; /* too big to cache */
 493
 494    if (!cache->empty) {
 495       px = x - cache->xpos;  /* pos in buffer */
 496       py = y - cache->ypos;
 497       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 498           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 499           !TEST_EQ_4V(ctx->Current.RasterColor, cache->color) ||
 500           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 501          /* This bitmap would extend beyond cache bounds, or the bitmap
 502           * color is changing
 503           * so flush and continue.
 504           */
 505          st_flush_bitmap_cache(st);
 506       }
 507    }
 508
 509    if (cache->empty) {
 510       /* Initialize.  Center bitmap vertically in the buffer. */
 511       px = 0;
 512       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 513       cache->xpos = x;
 514       cache->ypos = y - py;
 515       cache->zpos = z;
 516       cache->empty = GL_FALSE;
 517       COPY_4FV(cache->color, ctx->Current.RasterColor);
 518    }
 519
 520    assert(px != -999);
 521    assert(py != -999);
 522
 523    if (x < cache->xmin)
 524       cache->xmin = x;
 525    if (y < cache->ymin)
 526       cache->ymin = y;
 527    if (x + width > cache->xmax)
 528       cache->xmax = x + width;
 529    if (y + height > cache->ymax)
 530       cache->ymax = y + height;
 531
 532    /* create the transfer if needed */
 533    create_cache_trans(st);
 534
 535    /* PBO source... */
 536    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 537    if (!bitmap) {
 538       return FALSE;
 539    }
 540
 541    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 542                  cache->buffer, BITMAP_CACHE_WIDTH);
 543
 544    _mesa_unmap_pbo_source(ctx, unpack);
 545
 546    return GL_TRUE; /* accumulated */
 547 }
 548
 549
 550 /**
 551  * One-time init for drawing bitmaps.
 552  */
 553 static void
 554 init_bitmap_state(struct st_context *st)
 555 {
 556    struct pipe_context *pipe = st->pipe;
 557    struct pipe_screen *screen = pipe->screen;
 558
 559    /* This function should only be called once */
 560    assert(st->bitmap.cache == NULL);
 561
 562    assert(st->internal_target == PIPE_TEXTURE_2D ||
 563           st->internal_target == PIPE_TEXTURE_RECT);
 564
 565    /* alloc bitmap cache object */
 566    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 567
 568    /* init sampler state once */
 569    memset(&st->bitmap.sampler, 0, sizeof(st->bitmap.sampler));
 570    st->bitmap.sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;
 571    st->bitmap.sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;
 572    st->bitmap.sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;
 573    st->bitmap.sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 574    st->bitmap.sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 575    st->bitmap.sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 576    st->bitmap.sampler.normalized_coords = st->internal_target == PIPE_TEXTURE_2D;
 577
 578    st->bitmap.atlas_sampler = st->bitmap.sampler;
 579    st->bitmap.atlas_sampler.normalized_coords = 0;
 580
 581    /* init baseline rasterizer state once */
 582    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 583    st->bitmap.rasterizer.half_pixel_center = 1;
 584    st->bitmap.rasterizer.bottom_edge_rule = 1;
 585    st->bitmap.rasterizer.depth_clip = 1;
 586
 587    /* find a usable texture format */
 588    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 589                                    st->internal_target, 0,
 590                                    PIPE_BIND_SAMPLER_VIEW)) {
 591       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 592    }
 593    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 594                                         st->internal_target, 0,
 595                                         PIPE_BIND_SAMPLER_VIEW)) {
 596       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 597    }
 598    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 599                                         st->internal_target, 0,
 600                                         PIPE_BIND_SAMPLER_VIEW)) {
 601       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 602    }
 603    else {
 604       /* XXX support more formats */
 605       assert(0);
 606    }
 607
 608    /* Create the vertex shader */
 609    {
 610       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 611                                       TGSI_SEMANTIC_COLOR,
 612         st->needs_texcoord_semantic ? TGSI_SEMANTIC_TEXCOORD :
 613                                       TGSI_SEMANTIC_GENERIC };
 614       const uint semantic_indexes[] = { 0, 0, 0 };
 615       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 616                                                           semantic_names,
 617                                                           semantic_indexes,
 618                                                           FALSE);
 619    }
 620
 621    reset_cache(st);
 622 }
 623
 624
 625 /**
 626  * Called via ctx->Driver.Bitmap()
 627  */
 628 static void
 629 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 630           GLsizei width, GLsizei height,
 631           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 632 {
 633    struct st_context *st = st_context(ctx);
 634    struct pipe_resource *pt;
 635
 636    assert(width > 0);
 637    assert(height > 0);
 638
 639    if (!st->bitmap.cache) {
 640       init_bitmap_state(st);
 641    }
 642
 643    /* We only need to validate state of the st dirty flags are set or
 644     * any non-_NEW_PROGRAM_CONSTANTS mesa flags are set.  The VS we use
 645     * for bitmap drawing uses no constants and the FS constants are
 646     * explicitly uploaded in the draw_bitmap_quad() function.
 647     */
 648    if ((st->dirty.mesa & ~_NEW_PROGRAM_CONSTANTS) || st->dirty.st) {
 649       st_validate_state(st, ST_PIPELINE_RENDER);
 650    }
 651
 652    if (UseBitmapCache && accum_bitmap(ctx, x, y, width, height, unpack, bitmap))
 653       return;
 654
 655    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 656    if (pt) {
 657       struct pipe_sampler_view *sv =
 658          st_create_texture_sampler_view(st->pipe, pt);
 659
 660       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 661
 662       if (sv) {
 663          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 664                           width, height, sv, ctx->Current.RasterColor);
 665
 666          pipe_sampler_view_reference(&sv, NULL);
 667       }
 668
 669       /* release/free the texture */
 670       pipe_resource_reference(&pt, NULL);
 671    }
 672 }
 673
 674
 675 /**
 676  * Called via ctx->Driver.DrawAtlasBitmap()
 677  */
 678 static void
 679 st_DrawAtlasBitmaps(struct gl_context *ctx,
 680                     const struct gl_bitmap_atlas *atlas,
 681                     GLuint count, const GLubyte *ids)
 682 {
 683    struct st_context *st = st_context(ctx);
 684    struct pipe_context *pipe = st->pipe;
 685    struct st_texture_object *stObj = st_texture_object(atlas->texObj);
 686    struct pipe_sampler_view *sv;
 687    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 688    const float z = ctx->Current.RasterPos[2] * 2.0f - 1.0f;
 689    const float *color = ctx->Current.RasterColor;
 690    const float clip_x_scale = 2.0f / st->state.framebuffer.width;
 691    const float clip_y_scale = 2.0f / st->state.framebuffer.height;
 692    const unsigned num_verts = count * 4;
 693    const unsigned num_vert_bytes = num_verts * sizeof(struct st_util_vertex);
 694    struct st_util_vertex *verts;
 695    struct pipe_vertex_buffer vb = {0};
 696    unsigned i;
 697
 698    if (!st->bitmap.cache) {
 699       init_bitmap_state(st);
 700    }
 701
 702    st_flush_bitmap_cache(st);
 703
 704    st_validate_state(st, ST_PIPELINE_RENDER);
 705
 706    sv = st_create_texture_sampler_view(pipe, stObj->pt);
 707    if (!sv) {
 708       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCallLists(bitmap text)");
 709       return;
 710    }
 711
 712    setup_render_state(ctx, sv, color, true);
 713
 714    vb.stride = sizeof(struct st_util_vertex);
 715
 716    u_upload_alloc(st->uploader, 0, num_vert_bytes, 4,
 717                   &vb.buffer_offset, &vb.buffer, (void **) &verts);
 718
 719    /* build quads vertex data */
 720    for (i = 0; i < count; i++) {
 721       const GLfloat epsilon = 0.0001F;
 722       const struct gl_bitmap_glyph *g = &atlas->glyphs[ids[i]];
 723       const float xmove = g->xmove, ymove = g->ymove;
 724       const float xorig = g->xorig, yorig = g->yorig;
 725       const float s0 = g->x, t0 = g->y;
 726       const float s1 = s0 + g->w, t1 = t0 + g->h;
 727       const float x0 = IFLOOR(ctx->Current.RasterPos[0] - xorig + epsilon);
 728       const float y0 = IFLOOR(ctx->Current.RasterPos[1] - yorig + epsilon);
 729       const float x1 = x0 + g->w, y1 = y0 + g->h;
 730       const float clip_x0 = x0 * clip_x_scale - 1.0f;
 731       const float clip_y0 = y0 * clip_y_scale - 1.0f;
 732       const float clip_x1 = x1 * clip_x_scale - 1.0f;
 733       const float clip_y1 = y1 * clip_y_scale - 1.0f;
 734
 735       /* lower-left corner */
 736       verts->x = clip_x0;
 737       verts->y = clip_y0;
 738       verts->z = z;
 739       verts->r = color[0];
 740       verts->g = color[1];
 741       verts->b = color[2];
 742       verts->a = color[3];
 743       verts->s = s0;
 744       verts->t = t0;
 745       verts++;
 746
 747       /* lower-right corner */
 748       verts->x = clip_x1;
 749       verts->y = clip_y0;
 750       verts->z = z;
 751       verts->r = color[0];
 752       verts->g = color[1];
 753       verts->b = color[2];
 754       verts->a = color[3];
 755       verts->s = s1;
 756       verts->t = t0;
 757       verts++;
 758
 759       /* upper-right corner */
 760       verts->x = clip_x1;
 761       verts->y = clip_y1;
 762       verts->z = z;
 763       verts->r = color[0];
 764       verts->g = color[1];
 765       verts->b = color[2];
 766       verts->a = color[3];
 767       verts->s = s1;
 768       verts->t = t1;
 769       verts++;
 770
 771       /* upper-left corner */
 772       verts->x = clip_x0;
 773       verts->y = clip_y1;
 774       verts->z = z;
 775       verts->r = color[0];
 776       verts->g = color[1];
 777       verts->b = color[2];
 778       verts->a = color[3];
 779       verts->s = s0;
 780       verts->t = t1;
 781       verts++;
 782
 783       /* Update the raster position */
 784       ctx->Current.RasterPos[0] += xmove;
 785       ctx->Current.RasterPos[1] += ymove;
 786    }
 787
 788    u_upload_unmap(st->uploader);
 789
 790    cso_set_vertex_buffers(st->cso_context,
 791                           cso_get_aux_vertex_buffer_slot(st->cso_context),
 792                           1, &vb);
 793
 794    cso_draw_arrays(st->cso_context, PIPE_PRIM_QUADS, 0, num_verts);
 795
 796    restore_render_state(ctx);
 797
 798    pipe_resource_reference(&vb.buffer, NULL);
 799
 800    pipe_sampler_view_reference(&sv, NULL);
 801
 802    /* We uploaded modified constants, need to invalidate them. */
 803    st->dirty.mesa |= _NEW_PROGRAM_CONSTANTS;
 804 }
 805
 806
 807
 808 /** Per-context init */
 809 void
 810 st_init_bitmap_functions(struct dd_function_table *functions)
 811 {
 812    functions->Bitmap = st_Bitmap;
 813    functions->DrawAtlasBitmaps = st_DrawAtlasBitmaps;
 814 }
 815
 816
 817 /** Per-context tear-down */
 818 void
 819 st_destroy_bitmap(struct st_context *st)
 820 {
 821    struct pipe_context *pipe = st->pipe;
 822    struct bitmap_cache *cache = st->bitmap.cache;
 823
 824    if (st->bitmap.vs) {
 825       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 826       st->bitmap.vs = NULL;
 827    }
 828
 829    if (cache) {
 830       if (cache->trans && cache->buffer) {
 831          pipe_transfer_unmap(pipe, cache->trans);
 832       }
 833       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 834       free(st->bitmap.cache);
 835       st->bitmap.cache = NULL;
 836    }
 837 }