src/mesa/state_tracker/st_cb_bitmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Brian Paul
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/bufferobj.h"
  36 #include "main/macros.h"
  37 #include "main/mfeatures.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_program.h"
  46 #include "st_cb_bitmap.h"
  47 #include "st_texture.h"
  48
  49 #include "pipe/p_context.h"
  50 #include "pipe/p_defines.h"
  51 #include "pipe/p_shader_tokens.h"
  52 #include "util/u_inlines.h"
  53 #include "util/u_draw_quad.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  * Make fragment program for glBitmap:
 113  *   Sample the texture and kill the fragment if the bit is 0.
 114  * This program will be combined with the user's fragment program.
 115  */
 116 static struct st_fragment_program *
 117 make_bitmap_fragment_program(struct gl_context *ctx, GLuint samplerIndex)
 118 {
 119    struct st_context *st = st_context(ctx);
 120    struct st_fragment_program *stfp;
 121    struct gl_program *p;
 122    GLuint ic = 0;
 123
 124    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 125    if (!p)
 126       return NULL;
 127
 128    p->NumInstructions = 3;
 129
 130    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 131    if (!p->Instructions) {
 132       ctx->Driver.DeleteProgram(ctx, p);
 133       return NULL;
 134    }
 135    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 136
 137    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 138    p->Instructions[ic].Opcode = OPCODE_TEX;
 139    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 140    p->Instructions[ic].DstReg.Index = 0;
 141    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 142    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 143    p->Instructions[ic].TexSrcUnit = samplerIndex;
 144    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 145    ic++;
 146
 147    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 148    p->Instructions[ic].Opcode = OPCODE_KIL;
 149    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 150
 151    if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 152       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 153
 154    p->Instructions[ic].SrcReg[0].Index = 0;
 155    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 156    ic++;
 157
 158    /* END; */
 159    p->Instructions[ic++].Opcode = OPCODE_END;
 160
 161    assert(ic == p->NumInstructions);
 162
 163    p->InputsRead = FRAG_BIT_TEX0;
 164    p->OutputsWritten = 0x0;
 165    p->SamplersUsed = (1 << samplerIndex);
 166
 167    stfp = (struct st_fragment_program *) p;
 168    stfp->Base.UsesKill = GL_TRUE;
 169
 170    return stfp;
 171 }
 172
 173
 174 static struct gl_program *
 175 make_bitmap_fragment_program_glsl(struct st_context *st,
 176                                   struct st_fragment_program *orig,
 177                                   GLuint samplerIndex)
 178 {
 179    struct gl_context *ctx = st->ctx;
 180    struct st_fragment_program *fp = (struct st_fragment_program *)
 181       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 182
 183    if (!fp)
 184       return NULL;
 185
 186    get_bitmap_visitor(fp, orig->glsl_to_tgsi, samplerIndex);
 187    return &fp->Base.Base;
 188 }
 189
 190
 191 static int
 192 find_free_bit(uint bitfield)
 193 {
 194    int i;
 195    for (i = 0; i < 32; i++) {
 196       if ((bitfield & (1 << i)) == 0) {
 197          return i;
 198       }
 199    }
 200    return -1;
 201 }
 202
 203
 204 /**
 205  * Combine basic bitmap fragment program with the user-defined program.
 206  * \param st  current context
 207  * \param fpIn  the incoming fragment program
 208  * \param fpOut  the new fragment program which does fragment culling
 209  * \param bitmap_sampler  sampler number for the bitmap texture
 210  */
 211 void
 212 st_make_bitmap_fragment_program(struct st_context *st,
 213                                 struct gl_fragment_program *fpIn,
 214                                 struct gl_fragment_program **fpOut,
 215                                 GLuint *bitmap_sampler)
 216 {
 217    struct st_fragment_program *bitmap_prog;
 218    struct st_fragment_program *stfpIn = (struct st_fragment_program *) fpIn;
 219    struct gl_program *newProg;
 220    uint sampler;
 221
 222    /*
 223     * Generate new program which is the user-defined program prefixed
 224     * with the bitmap sampler/kill instructions.
 225     */
 226    sampler = find_free_bit(fpIn->Base.SamplersUsed);
 227
 228    if (stfpIn->glsl_to_tgsi)
 229       newProg = make_bitmap_fragment_program_glsl(st, stfpIn, sampler);
 230    else {
 231       bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);
 232
 233       newProg = _mesa_combine_programs(st->ctx,
 234                                        &bitmap_prog->Base.Base,
 235                                        &fpIn->Base);
 236       /* done with this after combining */
 237       st_reference_fragprog(st, &bitmap_prog, NULL);
 238    }
 239
 240 #if 0
 241    {
 242       printf("Combined bitmap program:\n");
 243       _mesa_print_program(newProg);
 244       printf("InputsRead: 0x%x\n", newProg->InputsRead);
 245       printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
 246       _mesa_print_parameter_list(newProg->Parameters);
 247    }
 248 #endif
 249
 250    /* return results */
 251    *fpOut = (struct gl_fragment_program *) newProg;
 252    *bitmap_sampler = sampler;
 253 }
 254
 255
 256 /**
 257  * Copy user-provide bitmap bits into texture buffer, expanding
 258  * bits into texels.
 259  * "On" bits will set texels to 0x0.
 260  * "Off" bits will not modify texels.
 261  * Note that the image is actually going to be upside down in
 262  * the texture.  We deal with that with texcoords.
 263  */
 264 static void
 265 unpack_bitmap(struct st_context *st,
 266               GLint px, GLint py, GLsizei width, GLsizei height,
 267               const struct gl_pixelstore_attrib *unpack,
 268               const GLubyte *bitmap,
 269               ubyte *destBuffer, uint destStride)
 270 {
 271    destBuffer += py * destStride + px;
 272
 273    _mesa_expand_bitmap(width, height, unpack, bitmap,
 274                        destBuffer, destStride, 0x0);
 275 }
 276
 277
 278 /**
 279  * Create a texture which represents a bitmap image.
 280  */
 281 static struct pipe_resource *
 282 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 283                     const struct gl_pixelstore_attrib *unpack,
 284                     const GLubyte *bitmap)
 285 {
 286    struct st_context *st = st_context(ctx);
 287    struct pipe_context *pipe = st->pipe;
 288    struct pipe_transfer *transfer;
 289    ubyte *dest;
 290    struct pipe_resource *pt;
 291
 292    /* PBO source... */
 293    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 294    if (!bitmap) {
 295       return NULL;
 296    }
 297
 298    /**
 299     * Create texture to hold bitmap pattern.
 300     */
 301    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 302                           0, width, height, 1, 1,
 303                           PIPE_BIND_SAMPLER_VIEW);
 304    if (!pt) {
 305       _mesa_unmap_pbo_source(ctx, unpack);
 306       return NULL;
 307    }
 308
 309    dest = pipe_transfer_map(st->pipe, pt, 0, 0,
 310                             PIPE_TRANSFER_WRITE,
 311                             0, 0, width, height, &transfer);
 312
 313    /* Put image into texture transfer */
 314    memset(dest, 0xff, height * transfer->stride);
 315    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 316                  dest, transfer->stride);
 317
 318    _mesa_unmap_pbo_source(ctx, unpack);
 319
 320    /* Release transfer */
 321    pipe_transfer_unmap(pipe, transfer);
 322    return pt;
 323 }
 324
 325 static void
 326 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 327                          int x, int y, int width, int height,
 328                          float z, const float color[4],
 329                          struct pipe_resource **vbuf,
 330                          unsigned *vbuf_offset)
 331 {
 332    const GLfloat fb_width = (GLfloat)st->state.framebuffer.width;
 333    const GLfloat fb_height = (GLfloat)st->state.framebuffer.height;
 334    const GLfloat x0 = (GLfloat)x;
 335    const GLfloat x1 = (GLfloat)(x + width);
 336    const GLfloat y0 = (GLfloat)y;
 337    const GLfloat y1 = (GLfloat)(y + height);
 338    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 339    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 340    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 341    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 342    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 343    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 344    GLuint i;
 345    float (*vertices)[3][4];  /**< vertex pos + color + texcoord */
 346
 347    if(!normalized)
 348    {
 349       sRight = (GLfloat) width;
 350       tBot = (GLfloat) height;
 351    }
 352
 353    u_upload_alloc(st->uploader, 0, 4 * sizeof(vertices[0]), vbuf_offset, vbuf,
 354                   (void**)&vertices);
 355    if (!vbuf) {
 356       return;
 357    }
 358
 359    /* Positions are in clip coords since we need to do clipping in case
 360     * the bitmap quad goes beyond the window bounds.
 361     */
 362    vertices[0][0][0] = clip_x0;
 363    vertices[0][0][1] = clip_y0;
 364    vertices[0][2][0] = sLeft;
 365    vertices[0][2][1] = tTop;
 366
 367    vertices[1][0][0] = clip_x1;
 368    vertices[1][0][1] = clip_y0;
 369    vertices[1][2][0] = sRight;
 370    vertices[1][2][1] = tTop;
 371
 372    vertices[2][0][0] = clip_x1;
 373    vertices[2][0][1] = clip_y1;
 374    vertices[2][2][0] = sRight;
 375    vertices[2][2][1] = tBot;
 376
 377    vertices[3][0][0] = clip_x0;
 378    vertices[3][0][1] = clip_y1;
 379    vertices[3][2][0] = sLeft;
 380    vertices[3][2][1] = tBot;
 381
 382    /* same for all verts: */
 383    for (i = 0; i < 4; i++) {
 384       vertices[i][0][2] = z;
 385       vertices[i][0][3] = 1.0f;
 386       vertices[i][1][0] = color[0];
 387       vertices[i][1][1] = color[1];
 388       vertices[i][1][2] = color[2];
 389       vertices[i][1][3] = color[3];
 390       vertices[i][2][2] = 0.0; /*R*/
 391       vertices[i][2][3] = 1.0; /*Q*/
 392    }
 393
 394    u_upload_unmap(st->uploader);
 395 }
 396
 397
 398
 399 /**
 400  * Render a glBitmap by drawing a textured quad
 401  */
 402 static void
 403 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 404                  GLsizei width, GLsizei height,
 405                  struct pipe_sampler_view *sv,
 406                  const GLfloat *color)
 407 {
 408    struct st_context *st = st_context(ctx);
 409    struct pipe_context *pipe = st->pipe;
 410    struct cso_context *cso = st->cso_context;
 411    struct st_fp_variant *fpv;
 412    struct st_fp_variant_key key;
 413    GLuint maxSize;
 414    GLuint offset;
 415    struct pipe_resource *vbuf = NULL;
 416
 417    memset(&key, 0, sizeof(key));
 418    key.st = st;
 419    key.bitmap = GL_TRUE;
 420    key.clamp_color = st->clamp_frag_color_in_shader &&
 421                      st->ctx->Color._ClampFragmentColor &&
 422                      !st->ctx->DrawBuffer->_IntegerColor;
 423
 424    fpv = st_get_fp_variant(st, st->fp, &key);
 425
 426    /* As an optimization, Mesa's fragment programs will sometimes get the
 427     * primary color from a statevar/constant rather than a varying variable.
 428     * when that's the case, we need to ensure that we use the 'color'
 429     * parameter and not the current attribute color (which may have changed
 430     * through glRasterPos and state validation.
 431     * So, we force the proper color here.  Not elegant, but it works.
 432     */
 433    {
 434       GLfloat colorSave[4];
 435       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 436       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 437       st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
 438       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 439    }
 440
 441
 442    /* limit checks */
 443    /* XXX if the bitmap is larger than the max texture size, break
 444     * it up into chunks.
 445     */
 446    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 447                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 448    assert(width <= (GLsizei)maxSize);
 449    assert(height <= (GLsizei)maxSize);
 450
 451    cso_save_rasterizer(cso);
 452    cso_save_samplers(cso, PIPE_SHADER_FRAGMENT);
 453    cso_save_sampler_views(cso, PIPE_SHADER_FRAGMENT);
 454    cso_save_viewport(cso);
 455    cso_save_fragment_shader(cso);
 456    cso_save_stream_outputs(cso);
 457    cso_save_vertex_shader(cso);
 458    cso_save_geometry_shader(cso);
 459    cso_save_vertex_elements(cso);
 460    cso_save_aux_vertex_buffer_slot(cso);
 461
 462    /* rasterizer state: just scissor */
 463    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 464    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 465
 466    /* fragment shader state: TEX lookup program */
 467    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 468
 469    /* vertex shader state: position + texcoord pass-through */
 470    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 471
 472    /* geometry shader state: disabled */
 473    cso_set_geometry_shader_handle(cso, NULL);
 474
 475    /* user samplers, plus our bitmap sampler */
 476    {
 477       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 478       uint num = MAX2(fpv->bitmap_sampler + 1,
 479                       st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 480       uint i;
 481       for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
 482          samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
 483       }
 484       samplers[fpv->bitmap_sampler] =
 485          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 486       cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
 487                        (const struct pipe_sampler_state **) samplers);
 488    }
 489
 490    /* user textures, plus the bitmap texture */
 491    {
 492       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 493       uint num = MAX2(fpv->bitmap_sampler + 1,
 494                       st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 495       memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 496              sizeof(sampler_views));
 497       sampler_views[fpv->bitmap_sampler] = sv;
 498       cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);
 499    }
 500
 501    /* viewport state: viewport matching window dims */
 502    {
 503       const GLboolean invert = st->state.fb_orientation == Y_0_TOP;
 504       const GLfloat width = (GLfloat)st->state.framebuffer.width;
 505       const GLfloat height = (GLfloat)st->state.framebuffer.height;
 506       struct pipe_viewport_state vp;
 507       vp.scale[0] =  0.5f * width;
 508       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 509       vp.scale[2] = 0.5f;
 510       vp.scale[3] = 1.0f;
 511       vp.translate[0] = 0.5f * width;
 512       vp.translate[1] = 0.5f * height;
 513       vp.translate[2] = 0.5f;
 514       vp.translate[3] = 0.0f;
 515       cso_set_viewport(cso, &vp);
 516    }
 517
 518    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 519    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 520
 521    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 522    z = z * 2.0f - 1.0f;
 523
 524    /* draw textured quad */
 525    setup_bitmap_vertex_data(st, sv->texture->target != PIPE_TEXTURE_RECT,
 526                             x, y, width, height, z, color, &vbuf, &offset);
 527
 528    if (vbuf) {
 529       util_draw_vertex_buffer(pipe, st->cso_context, vbuf,
 530                               cso_get_aux_vertex_buffer_slot(st->cso_context),
 531                               offset,
 532                               PIPE_PRIM_TRIANGLE_FAN,
 533                               4,  /* verts */
 534                               3); /* attribs/vert */
 535    }
 536
 537    /* restore state */
 538    cso_restore_rasterizer(cso);
 539    cso_restore_samplers(cso, PIPE_SHADER_FRAGMENT);
 540    cso_restore_sampler_views(cso, PIPE_SHADER_FRAGMENT);
 541    cso_restore_viewport(cso);
 542    cso_restore_fragment_shader(cso);
 543    cso_restore_vertex_shader(cso);
 544    cso_restore_geometry_shader(cso);
 545    cso_restore_vertex_elements(cso);
 546    cso_restore_aux_vertex_buffer_slot(cso);
 547    cso_restore_stream_outputs(cso);
 548
 549    pipe_resource_reference(&vbuf, NULL);
 550 }
 551
 552
 553 static void
 554 reset_cache(struct st_context *st)
 555 {
 556    struct bitmap_cache *cache = st->bitmap.cache;
 557
 558    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 559    cache->empty = GL_TRUE;
 560
 561    cache->xmin = 1000000;
 562    cache->xmax = -1000000;
 563    cache->ymin = 1000000;
 564    cache->ymax = -1000000;
 565
 566    assert(!cache->texture);
 567
 568    /* allocate a new texture */
 569    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 570                                       st->bitmap.tex_format, 0,
 571                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 572                                       1, 1,
 573                                       PIPE_BIND_SAMPLER_VIEW);
 574 }
 575
 576
 577 /** Print bitmap image to stdout (debug) */
 578 static void
 579 print_cache(const struct bitmap_cache *cache)
 580 {
 581    int i, j, k;
 582
 583    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 584       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 585       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 586          if (cache->buffer[k])
 587             printf("X");
 588          else
 589             printf(" ");
 590          k++;
 591       }
 592       printf("\n");
 593    }
 594 }
 595
 596
 597 /**
 598  * Create gallium pipe_transfer object for the bitmap cache.
 599  */
 600 static void
 601 create_cache_trans(struct st_context *st)
 602 {
 603    struct pipe_context *pipe = st->pipe;
 604    struct bitmap_cache *cache = st->bitmap.cache;
 605
 606    if (cache->trans)
 607       return;
 608
 609    /* Map the texture transfer.
 610     * Subsequent glBitmap calls will write into the texture image.
 611     */
 612    cache->buffer = pipe_transfer_map(pipe, cache->texture, 0, 0,
 613                                      PIPE_TRANSFER_WRITE, 0, 0,
 614                                      BITMAP_CACHE_WIDTH,
 615                                      BITMAP_CACHE_HEIGHT, &cache->trans);
 616
 617    /* init image to all 0xff */
 618    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 619 }
 620
 621
 622 /**
 623  * If there's anything in the bitmap cache, draw/flush it now.
 624  */
 625 void
 626 st_flush_bitmap_cache(struct st_context *st)
 627 {
 628    if (!st->bitmap.cache->empty) {
 629       struct bitmap_cache *cache = st->bitmap.cache;
 630
 631       struct pipe_context *pipe = st->pipe;
 632       struct pipe_sampler_view *sv;
 633
 634       assert(cache->xmin <= cache->xmax);
 635
 636 /*    printf("flush size %d x %d  at %d, %d\n",
 637              cache->xmax - cache->xmin,
 638              cache->ymax - cache->ymin,
 639              cache->xpos, cache->ypos);
 640 */
 641
 642       /* The texture transfer has been mapped until now.
 643           * So unmap and release the texture transfer before drawing.
 644           */
 645       if (cache->trans && cache->buffer) {
 646          if (0)
 647             print_cache(cache);
 648          pipe_transfer_unmap(pipe, cache->trans);
 649          cache->buffer = NULL;
 650          cache->trans = NULL;
 651       }
 652
 653       sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 654       if (sv) {
 655          draw_bitmap_quad(st->ctx,
 656                           cache->xpos,
 657                           cache->ypos,
 658                           cache->zpos,
 659                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 660                           sv,
 661                           cache->color);
 662
 663          pipe_sampler_view_reference(&sv, NULL);
 664       }
 665
 666       /* release/free the texture */
 667       pipe_resource_reference(&cache->texture, NULL);
 668
 669       reset_cache(st);
 670    }
 671 }
 672
 673
 674 /**
 675  * Try to accumulate this glBitmap call in the bitmap cache.
 676  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 677  */
 678 static GLboolean
 679 accum_bitmap(struct st_context *st,
 680              GLint x, GLint y, GLsizei width, GLsizei height,
 681              const struct gl_pixelstore_attrib *unpack,
 682              const GLubyte *bitmap )
 683 {
 684    struct bitmap_cache *cache = st->bitmap.cache;
 685    int px = -999, py = -999;
 686    const GLfloat z = st->ctx->Current.RasterPos[2];
 687
 688    if (width > BITMAP_CACHE_WIDTH ||
 689        height > BITMAP_CACHE_HEIGHT)
 690       return GL_FALSE; /* too big to cache */
 691
 692    if (!cache->empty) {
 693       px = x - cache->xpos;  /* pos in buffer */
 694       py = y - cache->ypos;
 695       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 696           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 697           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 698           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 699          /* This bitmap would extend beyond cache bounds, or the bitmap
 700           * color is changing
 701           * so flush and continue.
 702           */
 703          st_flush_bitmap_cache(st);
 704       }
 705    }
 706
 707    if (cache->empty) {
 708       /* Initialize.  Center bitmap vertically in the buffer. */
 709       px = 0;
 710       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 711       cache->xpos = x;
 712       cache->ypos = y - py;
 713       cache->zpos = z;
 714       cache->empty = GL_FALSE;
 715       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 716    }
 717
 718    assert(px != -999);
 719    assert(py != -999);
 720
 721    if (x < cache->xmin)
 722       cache->xmin = x;
 723    if (y < cache->ymin)
 724       cache->ymin = y;
 725    if (x + width > cache->xmax)
 726       cache->xmax = x + width;
 727    if (y + height > cache->ymax)
 728       cache->ymax = y + height;
 729
 730    /* create the transfer if needed */
 731    create_cache_trans(st);
 732
 733    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 734                  cache->buffer, BITMAP_CACHE_WIDTH);
 735
 736    return GL_TRUE; /* accumulated */
 737 }
 738
 739
 740
 741 /**
 742  * Called via ctx->Driver.Bitmap()
 743  */
 744 static void
 745 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 746           GLsizei width, GLsizei height,
 747           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 748 {
 749    struct st_context *st = st_context(ctx);
 750    struct pipe_resource *pt;
 751
 752    if (width == 0 || height == 0)
 753       return;
 754
 755    st_validate_state(st);
 756
 757    if (!st->bitmap.vs) {
 758       /* create pass-through vertex shader now */
 759       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 760                                       TGSI_SEMANTIC_COLOR,
 761                                       TGSI_SEMANTIC_GENERIC };
 762       const uint semantic_indexes[] = { 0, 0, 0 };
 763       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 764                                                           semantic_names,
 765                                                           semantic_indexes);
 766    }
 767
 768    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 769       return;
 770
 771    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 772    if (pt) {
 773       struct pipe_sampler_view *sv =
 774          st_create_texture_sampler_view(st->pipe, pt);
 775
 776       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 777
 778       if (sv) {
 779          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 780                           width, height, sv,
 781                           st->ctx->Current.RasterColor);
 782
 783          pipe_sampler_view_reference(&sv, NULL);
 784       }
 785
 786       /* release/free the texture */
 787       pipe_resource_reference(&pt, NULL);
 788    }
 789 }
 790
 791
 792 /** Per-context init */
 793 void
 794 st_init_bitmap_functions(struct dd_function_table *functions)
 795 {
 796    functions->Bitmap = st_Bitmap;
 797 }
 798
 799
 800 /** Per-context init */
 801 void
 802 st_init_bitmap(struct st_context *st)
 803 {
 804    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 805    struct pipe_context *pipe = st->pipe;
 806    struct pipe_screen *screen = pipe->screen;
 807
 808    /* init sampler state once */
 809    memset(sampler, 0, sizeof(*sampler));
 810    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 811    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 812    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 813    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 814    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 815    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 816    st->bitmap.samplers[1] = *sampler;
 817    st->bitmap.samplers[1].normalized_coords = 1;
 818
 819    /* init baseline rasterizer state once */
 820    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 821    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 822    st->bitmap.rasterizer.depth_clip = 1;
 823
 824    /* find a usable texture format */
 825    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 826                                    PIPE_TEXTURE_2D, 0,
 827                                    PIPE_BIND_SAMPLER_VIEW)) {
 828       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 829    }
 830    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 831                                         PIPE_TEXTURE_2D, 0,
 832                                         PIPE_BIND_SAMPLER_VIEW)) {
 833       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 834    }
 835    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 836                                         PIPE_TEXTURE_2D, 0,
 837                                         PIPE_BIND_SAMPLER_VIEW)) {
 838       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 839    }
 840    else {
 841       /* XXX support more formats */
 842       assert(0);
 843    }
 844
 845    /* alloc bitmap cache object */
 846    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 847
 848    reset_cache(st);
 849 }
 850
 851
 852 /** Per-context tear-down */
 853 void
 854 st_destroy_bitmap(struct st_context *st)
 855 {
 856    struct pipe_context *pipe = st->pipe;
 857    struct bitmap_cache *cache = st->bitmap.cache;
 858
 859    if (st->bitmap.vs) {
 860       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 861       st->bitmap.vs = NULL;
 862    }
 863
 864    if (cache) {
 865       if (cache->trans && cache->buffer) {
 866          pipe_transfer_unmap(pipe, cache->trans);
 867       }
 868       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 869       free(st->bitmap.cache);
 870       st->bitmap.cache = NULL;
 871    }
 872 }