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 "shader/program.h"
  38 #include "shader/prog_print.h"
  39
  40 #include "st_context.h"
  41 #include "st_atom.h"
  42 #include "st_atom_constbuf.h"
  43 #include "st_program.h"
  44 #include "st_cb_bitmap.h"
  45 #include "st_texture.h"
  46 #include "st_inlines.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_defines.h"
  50 #include "util/u_inlines.h"
  51 #include "util/u_draw_quad.h"
  52 #include "util/u_simple_shaders.h"
  53 #include "shader/prog_instruction.h"
  54 #include "cso_cache/cso_context.h"
  55
  56
  57
  58 /**
  59  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  60  * is stored in a texture image.  An alpha8 texture format is used.
  61  * The fragment shader samples a bit (texel) from the texture, then
  62  * discards the fragment if the bit is off.
  63  *
  64  * Note that we actually store the inverse image of the bitmap to
  65  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  66  * and an "off" bit is stored as texel=0xff.  Then we kill the
  67  * fragment if the negated texel value is less than zero.
  68  */
  69
  70
  71 /**
  72  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  73  * buffer which is then rendered en mass upon a flush, state change, etc.
  74  * A wide, short buffer is used to target the common case of a series
  75  * of glBitmap calls being used to draw text.
  76  */
  77 static GLboolean UseBitmapCache = GL_TRUE;
  78
  79
  80 #define BITMAP_CACHE_WIDTH  512
  81 #define BITMAP_CACHE_HEIGHT 32
  82
  83 struct bitmap_cache
  84 {
  85    /** Window pos to render the cached image */
  86    GLint xpos, ypos;
  87    /** Bounds of region used in window coords */
  88    GLint xmin, ymin, xmax, ymax;
  89
  90    GLfloat color[4];
  91
  92    /** Bitmap's Z position */
  93    GLfloat zpos;
  94
  95    struct pipe_resource *texture;
  96    struct pipe_transfer *trans;
  97
  98    GLboolean empty;
  99
 100    /** An I8 texture image: */
 101    ubyte *buffer;
 102 };
 103
 104
 105 /** Epsilon for Z comparisons */
 106 #define Z_EPSILON 1e-06
 107
 108
 109 /**
 110  * Make fragment program for glBitmap:
 111  *   Sample the texture and kill the fragment if the bit is 0.
 112  * This program will be combined with the user's fragment program.
 113  */
 114 static struct st_fragment_program *
 115 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 116 {
 117    struct st_context *st = st_context(ctx);
 118    struct st_fragment_program *stfp;
 119    struct gl_program *p;
 120    GLuint ic = 0;
 121
 122    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 123    if (!p)
 124       return NULL;
 125
 126    p->NumInstructions = 3;
 127
 128    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 129    if (!p->Instructions) {
 130       ctx->Driver.DeleteProgram(ctx, p);
 131       return NULL;
 132    }
 133    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 134
 135    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 136    p->Instructions[ic].Opcode = OPCODE_TEX;
 137    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 138    p->Instructions[ic].DstReg.Index = 0;
 139    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 140    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 141    p->Instructions[ic].TexSrcUnit = samplerIndex;
 142    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 143    ic++;
 144
 145    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 146    p->Instructions[ic].Opcode = OPCODE_KIL;
 147    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 148
 149    if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 150       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 151
 152    p->Instructions[ic].SrcReg[0].Index = 0;
 153    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 154    ic++;
 155
 156    /* END; */
 157    p->Instructions[ic++].Opcode = OPCODE_END;
 158
 159    assert(ic == p->NumInstructions);
 160
 161    p->InputsRead = FRAG_BIT_TEX0;
 162    p->OutputsWritten = 0x0;
 163    p->SamplersUsed = (1 << samplerIndex);
 164
 165    stfp = (struct st_fragment_program *) p;
 166    stfp->Base.UsesKill = GL_TRUE;
 167
 168    return stfp;
 169 }
 170
 171
 172 static int
 173 find_free_bit(uint bitfield)
 174 {
 175    int i;
 176    for (i = 0; i < 32; i++) {
 177       if ((bitfield & (1 << i)) == 0) {
 178          return i;
 179       }
 180    }
 181    return -1;
 182 }
 183
 184
 185 /**
 186  * Combine basic bitmap fragment program with the user-defined program.
 187  */
 188 static struct st_fragment_program *
 189 combined_bitmap_fragment_program(GLcontext *ctx)
 190 {
 191    struct st_context *st = st_context(ctx);
 192    struct st_fragment_program *stfp = st->fp;
 193
 194    if (!stfp->bitmap_program) {
 195       /*
 196        * Generate new program which is the user-defined program prefixed
 197        * with the bitmap sampler/kill instructions.
 198        */
 199       struct st_fragment_program *bitmap_prog;
 200       uint sampler;
 201
 202       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 203       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 204
 205       stfp->bitmap_program = (struct st_fragment_program *)
 206          _mesa_combine_programs(ctx,
 207                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 208       stfp->bitmap_program->bitmap_sampler = sampler;
 209
 210       /* done with this after combining */
 211       st_reference_fragprog(st, &bitmap_prog, NULL);
 212
 213 #if 0
 214       {
 215          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 216          printf("Combined bitmap program:\n");
 217          _mesa_print_program(p);
 218          printf("InputsRead: 0x%x\n", p->InputsRead);
 219          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 220          _mesa_print_parameter_list(p->Parameters);
 221       }
 222 #endif
 223
 224       /* translate to TGSI tokens */
 225       st_translate_fragment_program(st, stfp->bitmap_program);
 226    }
 227
 228    return stfp->bitmap_program;
 229 }
 230
 231
 232 /**
 233  * Copy user-provide bitmap bits into texture buffer, expanding
 234  * bits into texels.
 235  * "On" bits will set texels to 0x0.
 236  * "Off" bits will not modify texels.
 237  * Note that the image is actually going to be upside down in
 238  * the texture.  We deal with that with texcoords.
 239  */
 240 static void
 241 unpack_bitmap(struct st_context *st,
 242               GLint px, GLint py, GLsizei width, GLsizei height,
 243               const struct gl_pixelstore_attrib *unpack,
 244               const GLubyte *bitmap,
 245               ubyte *destBuffer, uint destStride)
 246 {
 247    destBuffer += py * destStride + px;
 248
 249    _mesa_expand_bitmap(width, height, unpack, bitmap,
 250                        destBuffer, destStride, 0x0);
 251 }
 252
 253
 254 /**
 255  * Create a texture which represents a bitmap image.
 256  */
 257 static struct pipe_resource *
 258 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 259                     const struct gl_pixelstore_attrib *unpack,
 260                     const GLubyte *bitmap)
 261 {
 262    struct st_context *st = st_context(ctx);
 263    struct pipe_context *pipe = st->pipe;
 264    struct pipe_transfer *transfer;
 265    ubyte *dest;
 266    struct pipe_resource *pt;
 267
 268    /* PBO source... */
 269    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 270    if (!bitmap) {
 271       return NULL;
 272    }
 273
 274    /**
 275     * Create texture to hold bitmap pattern.
 276     */
 277    pt = st_texture_create(st, PIPE_TEXTURE_2D, st->bitmap.tex_format,
 278                           0, width, height, 1,
 279                           PIPE_BIND_SAMPLER_VIEW);
 280    if (!pt) {
 281       _mesa_unmap_pbo_source(ctx, unpack);
 282       return NULL;
 283    }
 284
 285    transfer = st_no_flush_get_tex_transfer(st, pt, 0, 0, 0,
 286                                            PIPE_TRANSFER_WRITE,
 287                                            0, 0, width, height);
 288
 289    dest = pipe_transfer_map(pipe, transfer);
 290
 291    /* Put image into texture transfer */
 292    memset(dest, 0xff, height * transfer->stride);
 293    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 294                  dest, transfer->stride);
 295
 296    _mesa_unmap_pbo_source(ctx, unpack);
 297
 298    /* Release transfer */
 299    pipe_transfer_unmap(pipe, transfer);
 300    pipe->transfer_destroy(pipe, transfer);
 301
 302    return pt;
 303 }
 304
 305 static GLuint
 306 setup_bitmap_vertex_data(struct st_context *st,
 307                          int x, int y, int width, int height,
 308                          float z, const float color[4])
 309 {
 310    struct pipe_context *pipe = st->pipe;
 311    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 312    const GLfloat fb_width = (GLfloat)fb->Width;
 313    const GLfloat fb_height = (GLfloat)fb->Height;
 314    const GLfloat x0 = (GLfloat)x;
 315    const GLfloat x1 = (GLfloat)(x + width);
 316    const GLfloat y0 = (GLfloat)y;
 317    const GLfloat y1 = (GLfloat)(y + height);
 318    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 319    const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 320    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 321    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 322    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 323    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 324
 325    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 326     * no_flush) updates to buffers where we know there is no conflict
 327     * with previous data.  Currently using max_slots > 1 will cause
 328     * synchronous rendering if the driver flushes its command buffers
 329     * between one bitmap and the next.  Our flush hook below isn't
 330     * sufficient to catch this as the driver doesn't tell us when it
 331     * flushes its own command buffers.  Until this gets fixed, pay the
 332     * price of allocating a new buffer for each bitmap cache-flush to
 333     * avoid synchronous rendering.
 334     */
 335    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 336    GLuint i;
 337
 338    if (st->bitmap.vbuf_slot >= max_slots) {
 339       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 340       st->bitmap.vbuf_slot = 0;
 341    }
 342
 343    if (!st->bitmap.vbuf) {
 344       st->bitmap.vbuf = pipe_buffer_create(pipe->screen,
 345                                            PIPE_BIND_VERTEX_BUFFER,
 346                                            max_slots * sizeof(st->bitmap.vertices));
 347    }
 348
 349    /* Positions are in clip coords since we need to do clipping in case
 350     * the bitmap quad goes beyond the window bounds.
 351     */
 352    st->bitmap.vertices[0][0][0] = clip_x0;
 353    st->bitmap.vertices[0][0][1] = clip_y0;
 354    st->bitmap.vertices[0][2][0] = sLeft;
 355    st->bitmap.vertices[0][2][1] = tTop;
 356
 357    st->bitmap.vertices[1][0][0] = clip_x1;
 358    st->bitmap.vertices[1][0][1] = clip_y0;
 359    st->bitmap.vertices[1][2][0] = sRight;
 360    st->bitmap.vertices[1][2][1] = tTop;
 361
 362    st->bitmap.vertices[2][0][0] = clip_x1;
 363    st->bitmap.vertices[2][0][1] = clip_y1;
 364    st->bitmap.vertices[2][2][0] = sRight;
 365    st->bitmap.vertices[2][2][1] = tBot;
 366
 367    st->bitmap.vertices[3][0][0] = clip_x0;
 368    st->bitmap.vertices[3][0][1] = clip_y1;
 369    st->bitmap.vertices[3][2][0] = sLeft;
 370    st->bitmap.vertices[3][2][1] = tBot;
 371
 372    /* same for all verts: */
 373    for (i = 0; i < 4; i++) {
 374       st->bitmap.vertices[i][0][2] = z;
 375       st->bitmap.vertices[i][0][3] = 1.0;
 376       st->bitmap.vertices[i][1][0] = color[0];
 377       st->bitmap.vertices[i][1][1] = color[1];
 378       st->bitmap.vertices[i][1][2] = color[2];
 379       st->bitmap.vertices[i][1][3] = color[3];
 380       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 381       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 382    }
 383
 384    /* put vertex data into vbuf */
 385    st_no_flush_pipe_buffer_write_nooverlap(st,
 386                                            st->bitmap.vbuf,
 387                                            st->bitmap.vbuf_slot * sizeof st->bitmap.vertices,
 388                                            sizeof st->bitmap.vertices,
 389                                            st->bitmap.vertices);
 390
 391    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 392 }
 393
 394
 395
 396 /**
 397  * Render a glBitmap by drawing a textured quad
 398  */
 399 static void
 400 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 401                  GLsizei width, GLsizei height,
 402                  struct pipe_sampler_view *sv,
 403                  const GLfloat *color)
 404 {
 405    struct st_context *st = st_context(ctx);
 406    struct pipe_context *pipe = st->pipe;
 407    struct cso_context *cso = st->cso_context;
 408    struct st_fragment_program *stfp;
 409    GLuint maxSize;
 410    GLuint offset;
 411
 412    stfp = combined_bitmap_fragment_program(ctx);
 413
 414    /* As an optimization, Mesa's fragment programs will sometimes get the
 415     * primary color from a statevar/constant rather than a varying variable.
 416     * when that's the case, we need to ensure that we use the 'color'
 417     * parameter and not the current attribute color (which may have changed
 418     * through glRasterPos and state validation.
 419     * So, we force the proper color here.  Not elegant, but it works.
 420     */
 421    {
 422       GLfloat colorSave[4];
 423       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 424       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 425       st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 426       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 427    }
 428
 429
 430    /* limit checks */
 431    /* XXX if the bitmap is larger than the max texture size, break
 432     * it up into chunks.
 433     */
 434    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 435    assert(width <= (GLsizei)maxSize);
 436    assert(height <= (GLsizei)maxSize);
 437
 438    cso_save_rasterizer(cso);
 439    cso_save_samplers(cso);
 440    cso_save_fragment_sampler_views(cso);
 441    cso_save_viewport(cso);
 442    cso_save_fragment_shader(cso);
 443    cso_save_vertex_shader(cso);
 444    cso_save_vertex_elements(cso);
 445
 446    /* rasterizer state: just scissor */
 447    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 448    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 449
 450    /* fragment shader state: TEX lookup program */
 451    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 452
 453    /* vertex shader state: position + texcoord pass-through */
 454    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 455
 456    /* user samplers, plus our bitmap sampler */
 457    {
 458       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 459       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 460       uint i;
 461       for (i = 0; i < st->state.num_samplers; i++) {
 462          samplers[i] = &st->state.samplers[i];
 463       }
 464       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 465       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 466    }
 467
 468    /* user textures, plus the bitmap texture */
 469    {
 470       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 471       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 472       memcpy(sampler_views, st->state.sampler_views, sizeof(sampler_views));
 473       sampler_views[stfp->bitmap_sampler] = sv;
 474       cso_set_fragment_sampler_views(cso, num, sampler_views);
 475    }
 476
 477    /* viewport state: viewport matching window dims */
 478    {
 479       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 480       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 481       const GLfloat width = (GLfloat)fb->Width;
 482       const GLfloat height = (GLfloat)fb->Height;
 483       struct pipe_viewport_state vp;
 484       vp.scale[0] =  0.5f * width;
 485       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 486       vp.scale[2] = 0.5f;
 487       vp.scale[3] = 1.0f;
 488       vp.translate[0] = 0.5f * width;
 489       vp.translate[1] = 0.5f * height;
 490       vp.translate[2] = 0.5f;
 491       vp.translate[3] = 0.0f;
 492       cso_set_viewport(cso, &vp);
 493    }
 494
 495    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 496
 497    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 498    z = z * 2.0 - 1.0;
 499
 500    /* draw textured quad */
 501    offset = setup_bitmap_vertex_data(st, x, y, width, height, z, color);
 502
 503    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 504                            PIPE_PRIM_TRIANGLE_FAN,
 505                            4,  /* verts */
 506                            3); /* attribs/vert */
 507
 508
 509    /* restore state */
 510    cso_restore_rasterizer(cso);
 511    cso_restore_samplers(cso);
 512    cso_restore_fragment_sampler_views(cso);
 513    cso_restore_viewport(cso);
 514    cso_restore_fragment_shader(cso);
 515    cso_restore_vertex_shader(cso);
 516    cso_restore_vertex_elements(cso);
 517 }
 518
 519
 520 static void
 521 reset_cache(struct st_context *st)
 522 {
 523    struct pipe_context *pipe = st->pipe;
 524    struct bitmap_cache *cache = st->bitmap.cache;
 525
 526    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 527    cache->empty = GL_TRUE;
 528
 529    cache->xmin = 1000000;
 530    cache->xmax = -1000000;
 531    cache->ymin = 1000000;
 532    cache->ymax = -1000000;
 533
 534    if (cache->trans) {
 535       pipe->transfer_destroy(pipe, cache->trans);
 536       cache->trans = NULL;
 537    }
 538
 539    assert(!cache->texture);
 540
 541    /* allocate a new texture */
 542    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 543                                       st->bitmap.tex_format, 0,
 544                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 545                                       1,
 546                                       PIPE_BIND_SAMPLER_VIEW);
 547 }
 548
 549
 550 /** Print bitmap image to stdout (debug) */
 551 static void
 552 print_cache(const struct bitmap_cache *cache)
 553 {
 554    int i, j, k;
 555
 556    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 557       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 558       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 559          if (cache->buffer[k])
 560             printf("X");
 561          else
 562             printf(" ");
 563          k++;
 564       }
 565       printf("\n");
 566    }
 567 }
 568
 569
 570 static void
 571 create_cache_trans(struct st_context *st)
 572 {
 573    struct pipe_context *pipe = st->pipe;
 574    struct bitmap_cache *cache = st->bitmap.cache;
 575
 576    if (cache->trans)
 577       return;
 578
 579    /* Map the texture transfer.
 580     * Subsequent glBitmap calls will write into the texture image.
 581     */
 582    cache->trans = st_no_flush_get_tex_transfer(st, cache->texture, 0, 0, 0,
 583                                                PIPE_TRANSFER_WRITE, 0, 0,
 584                                                BITMAP_CACHE_WIDTH,
 585                                                BITMAP_CACHE_HEIGHT);
 586    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 587
 588    /* init image to all 0xff */
 589    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 590 }
 591
 592
 593 /**
 594  * If there's anything in the bitmap cache, draw/flush it now.
 595  */
 596 void
 597 st_flush_bitmap_cache(struct st_context *st)
 598 {
 599    if (!st->bitmap.cache->empty) {
 600       struct bitmap_cache *cache = st->bitmap.cache;
 601
 602       if (st->ctx->DrawBuffer) {
 603          struct pipe_context *pipe = st->pipe;
 604          struct pipe_sampler_view *sv;
 605
 606          assert(cache->xmin <= cache->xmax);
 607
 608 /*         printf("flush size %d x %d  at %d, %d\n",
 609                 cache->xmax - cache->xmin,
 610                 cache->ymax - cache->ymin,
 611                 cache->xpos, cache->ypos);
 612 */
 613
 614          /* The texture transfer has been mapped until now.
 615           * So unmap and release the texture transfer before drawing.
 616           */
 617          if (cache->trans) {
 618             if (0)
 619                print_cache(cache);
 620             pipe_transfer_unmap(pipe, cache->trans);
 621             cache->buffer = NULL;
 622
 623             pipe->transfer_destroy(pipe, cache->trans);
 624             cache->trans = NULL;
 625          }
 626
 627          sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 628          if (sv) {
 629             draw_bitmap_quad(st->ctx,
 630                              cache->xpos,
 631                              cache->ypos,
 632                              cache->zpos,
 633                              BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 634                              sv,
 635                              cache->color);
 636
 637             pipe_sampler_view_reference(&sv, NULL);
 638          }
 639       }
 640
 641       /* release/free the texture */
 642       pipe_resource_reference(&cache->texture, NULL);
 643
 644       reset_cache(st);
 645    }
 646 }
 647
 648 /* Flush bitmap cache and release vertex buffer.
 649  */
 650 void
 651 st_flush_bitmap( struct st_context *st )
 652 {
 653    st_flush_bitmap_cache(st);
 654
 655    /* Release vertex buffer to avoid synchronous rendering if we were
 656     * to map it in the next frame.
 657     */
 658    pipe_resource_reference(&st->bitmap.vbuf, NULL);
 659    st->bitmap.vbuf_slot = 0;
 660 }
 661
 662
 663 /**
 664  * Try to accumulate this glBitmap call in the bitmap cache.
 665  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 666  */
 667 static GLboolean
 668 accum_bitmap(struct st_context *st,
 669              GLint x, GLint y, GLsizei width, GLsizei height,
 670              const struct gl_pixelstore_attrib *unpack,
 671              const GLubyte *bitmap )
 672 {
 673    struct bitmap_cache *cache = st->bitmap.cache;
 674    int px = -999, py = -999;
 675    const GLfloat z = st->ctx->Current.RasterPos[2];
 676
 677    if (width > BITMAP_CACHE_WIDTH ||
 678        height > BITMAP_CACHE_HEIGHT)
 679       return GL_FALSE; /* too big to cache */
 680
 681    if (!cache->empty) {
 682       px = x - cache->xpos;  /* pos in buffer */
 683       py = y - cache->ypos;
 684       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 685           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 686           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 687           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 688          /* This bitmap would extend beyond cache bounds, or the bitmap
 689           * color is changing
 690           * so flush and continue.
 691           */
 692          st_flush_bitmap_cache(st);
 693       }
 694    }
 695
 696    if (cache->empty) {
 697       /* Initialize.  Center bitmap vertically in the buffer. */
 698       px = 0;
 699       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 700       cache->xpos = x;
 701       cache->ypos = y - py;
 702       cache->zpos = z;
 703       cache->empty = GL_FALSE;
 704       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 705    }
 706
 707    assert(px != -999);
 708    assert(py != -999);
 709
 710    if (x < cache->xmin)
 711       cache->xmin = x;
 712    if (y < cache->ymin)
 713       cache->ymin = y;
 714    if (x + width > cache->xmax)
 715       cache->xmax = x + width;
 716    if (y + height > cache->ymax)
 717       cache->ymax = y + height;
 718
 719    /* create the transfer if needed */
 720    create_cache_trans(st);
 721
 722    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 723                  cache->buffer, BITMAP_CACHE_WIDTH);
 724
 725    return GL_TRUE; /* accumulated */
 726 }
 727
 728
 729
 730 /**
 731  * Called via ctx->Driver.Bitmap()
 732  */
 733 static void
 734 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 735           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 736 {
 737    struct st_context *st = st_context(ctx);
 738    struct pipe_resource *pt;
 739
 740    if (width == 0 || height == 0)
 741       return;
 742
 743    st_validate_state(st);
 744
 745    if (!st->bitmap.vs) {
 746       /* create pass-through vertex shader now */
 747       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 748                                       TGSI_SEMANTIC_COLOR,
 749                                       TGSI_SEMANTIC_GENERIC };
 750       const uint semantic_indexes[] = { 0, 0, 0 };
 751       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 752                                                           semantic_names,
 753                                                           semantic_indexes);
 754    }
 755
 756    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 757       return;
 758
 759    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 760    if (pt) {
 761       struct pipe_sampler_view *sv = st_create_texture_sampler_view(st->pipe, pt);
 762
 763       assert(pt->target == PIPE_TEXTURE_2D);
 764
 765       if (sv) {
 766          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 767                           width, height, sv,
 768                           st->ctx->Current.RasterColor);
 769
 770          pipe_sampler_view_reference(&sv, NULL);
 771       }
 772
 773       /* release/free the texture */
 774       pipe_resource_reference(&pt, NULL);
 775    }
 776 }
 777
 778
 779 /** Per-context init */
 780 void
 781 st_init_bitmap_functions(struct dd_function_table *functions)
 782 {
 783    functions->Bitmap = st_Bitmap;
 784 }
 785
 786
 787 /** Per-context init */
 788 void
 789 st_init_bitmap(struct st_context *st)
 790 {
 791    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 792    struct pipe_context *pipe = st->pipe;
 793    struct pipe_screen *screen = pipe->screen;
 794
 795    /* init sampler state once */
 796    memset(sampler, 0, sizeof(*sampler));
 797    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 798    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 799    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 800    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 801    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 802    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 803    sampler->normalized_coords = 1;
 804
 805    /* init baseline rasterizer state once */
 806    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 807    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 808
 809    /* find a usable texture format */
 810    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D,
 811                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 812       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 813    }
 814    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM, PIPE_TEXTURE_2D,
 815                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 816       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 817    }
 818    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, PIPE_TEXTURE_2D,
 819                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 820       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 821    }
 822    else {
 823       /* XXX support more formats */
 824       assert(0);
 825    }
 826
 827    /* alloc bitmap cache object */
 828    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 829
 830    reset_cache(st);
 831 }
 832
 833
 834 /** Per-context tear-down */
 835 void
 836 st_destroy_bitmap(struct st_context *st)
 837 {
 838    struct pipe_context *pipe = st->pipe;
 839    struct bitmap_cache *cache = st->bitmap.cache;
 840
 841
 842
 843    if (st->bitmap.vs) {
 844       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 845       st->bitmap.vs = NULL;
 846    }
 847
 848    if (st->bitmap.vbuf) {
 849       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 850       st->bitmap.vbuf = NULL;
 851    }
 852
 853    if (cache) {
 854       if (cache->trans) {
 855          pipe_transfer_unmap(pipe, cache->trans);
 856          pipe->transfer_destroy(pipe, cache->trans);
 857       }
 858       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 859       free(st->bitmap.cache);
 860       st->bitmap.cache = NULL;
 861    }
 862 }