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    if (u_upload_alloc(st->uploader, 0, 4 * sizeof(vertices[0]),
 354                       vbuf_offset, vbuf, (void **) &vertices) != PIPE_OK) {
 355       return;
 356    }
 357
 358    /* Positions are in clip coords since we need to do clipping in case
 359     * the bitmap quad goes beyond the window bounds.
 360     */
 361    vertices[0][0][0] = clip_x0;
 362    vertices[0][0][1] = clip_y0;
 363    vertices[0][2][0] = sLeft;
 364    vertices[0][2][1] = tTop;
 365
 366    vertices[1][0][0] = clip_x1;
 367    vertices[1][0][1] = clip_y0;
 368    vertices[1][2][0] = sRight;
 369    vertices[1][2][1] = tTop;
 370
 371    vertices[2][0][0] = clip_x1;
 372    vertices[2][0][1] = clip_y1;
 373    vertices[2][2][0] = sRight;
 374    vertices[2][2][1] = tBot;
 375
 376    vertices[3][0][0] = clip_x0;
 377    vertices[3][0][1] = clip_y1;
 378    vertices[3][2][0] = sLeft;
 379    vertices[3][2][1] = tBot;
 380
 381    /* same for all verts: */
 382    for (i = 0; i < 4; i++) {
 383       vertices[i][0][2] = z;
 384       vertices[i][0][3] = 1.0f;
 385       vertices[i][1][0] = color[0];
 386       vertices[i][1][1] = color[1];
 387       vertices[i][1][2] = color[2];
 388       vertices[i][1][3] = color[3];
 389       vertices[i][2][2] = 0.0; /*R*/
 390       vertices[i][2][3] = 1.0; /*Q*/
 391    }
 392
 393    u_upload_unmap(st->uploader);
 394 }
 395
 396
 397
 398 /**
 399  * Render a glBitmap by drawing a textured quad
 400  */
 401 static void
 402 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 403                  GLsizei width, GLsizei height,
 404                  struct pipe_sampler_view *sv,
 405                  const GLfloat *color)
 406 {
 407    struct st_context *st = st_context(ctx);
 408    struct pipe_context *pipe = st->pipe;
 409    struct cso_context *cso = st->cso_context;
 410    struct st_fp_variant *fpv;
 411    struct st_fp_variant_key key;
 412    GLuint maxSize;
 413    GLuint offset;
 414    struct pipe_resource *vbuf = NULL;
 415
 416    memset(&key, 0, sizeof(key));
 417    key.st = st;
 418    key.bitmap = GL_TRUE;
 419    key.clamp_color = st->clamp_frag_color_in_shader &&
 420                      st->ctx->Color._ClampFragmentColor &&
 421                      !st->ctx->DrawBuffer->_IntegerColor;
 422
 423    fpv = st_get_fp_variant(st, st->fp, &key);
 424
 425    /* As an optimization, Mesa's fragment programs will sometimes get the
 426     * primary color from a statevar/constant rather than a varying variable.
 427     * when that's the case, we need to ensure that we use the 'color'
 428     * parameter and not the current attribute color (which may have changed
 429     * through glRasterPos and state validation.
 430     * So, we force the proper color here.  Not elegant, but it works.
 431     */
 432    {
 433       GLfloat colorSave[4];
 434       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 435       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 436       st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
 437       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 438    }
 439
 440
 441    /* limit checks */
 442    /* XXX if the bitmap is larger than the max texture size, break
 443     * it up into chunks.
 444     */
 445    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 446                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 447    assert(width <= (GLsizei)maxSize);
 448    assert(height <= (GLsizei)maxSize);
 449
 450    cso_save_rasterizer(cso);
 451    cso_save_samplers(cso, PIPE_SHADER_FRAGMENT);
 452    cso_save_sampler_views(cso, PIPE_SHADER_FRAGMENT);
 453    cso_save_viewport(cso);
 454    cso_save_fragment_shader(cso);
 455    cso_save_stream_outputs(cso);
 456    cso_save_vertex_shader(cso);
 457    cso_save_geometry_shader(cso);
 458    cso_save_vertex_elements(cso);
 459    cso_save_aux_vertex_buffer_slot(cso);
 460
 461    /* rasterizer state: just scissor */
 462    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 463    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 464
 465    /* fragment shader state: TEX lookup program */
 466    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 467
 468    /* vertex shader state: position + texcoord pass-through */
 469    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 470
 471    /* geometry shader state: disabled */
 472    cso_set_geometry_shader_handle(cso, NULL);
 473
 474    /* user samplers, plus our bitmap sampler */
 475    {
 476       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 477       uint num = MAX2(fpv->bitmap_sampler + 1,
 478                       st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 479       uint i;
 480       for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
 481          samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
 482       }
 483       samplers[fpv->bitmap_sampler] =
 484          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 485       cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
 486                        (const struct pipe_sampler_state **) samplers);
 487    }
 488
 489    /* user textures, plus the bitmap texture */
 490    {
 491       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 492       uint num = MAX2(fpv->bitmap_sampler + 1,
 493                       st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 494       memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 495              sizeof(sampler_views));
 496       sampler_views[fpv->bitmap_sampler] = sv;
 497       cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);
 498    }
 499
 500    /* viewport state: viewport matching window dims */
 501    {
 502       const GLboolean invert = st->state.fb_orientation == Y_0_TOP;
 503       const GLfloat width = (GLfloat)st->state.framebuffer.width;
 504       const GLfloat height = (GLfloat)st->state.framebuffer.height;
 505       struct pipe_viewport_state vp;
 506       vp.scale[0] =  0.5f * width;
 507       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 508       vp.scale[2] = 0.5f;
 509       vp.scale[3] = 1.0f;
 510       vp.translate[0] = 0.5f * width;
 511       vp.translate[1] = 0.5f * height;
 512       vp.translate[2] = 0.5f;
 513       vp.translate[3] = 0.0f;
 514       cso_set_viewport(cso, &vp);
 515    }
 516
 517    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 518    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 519
 520    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 521    z = z * 2.0f - 1.0f;
 522
 523    /* draw textured quad */
 524    setup_bitmap_vertex_data(st, sv->texture->target != PIPE_TEXTURE_RECT,
 525                             x, y, width, height, z, color, &vbuf, &offset);
 526
 527    if (vbuf) {
 528       util_draw_vertex_buffer(pipe, st->cso_context, vbuf,
 529                               cso_get_aux_vertex_buffer_slot(st->cso_context),
 530                               offset,
 531                               PIPE_PRIM_TRIANGLE_FAN,
 532                               4,  /* verts */
 533                               3); /* attribs/vert */
 534    }
 535
 536    /* restore state */
 537    cso_restore_rasterizer(cso);
 538    cso_restore_samplers(cso, PIPE_SHADER_FRAGMENT);
 539    cso_restore_sampler_views(cso, PIPE_SHADER_FRAGMENT);
 540    cso_restore_viewport(cso);
 541    cso_restore_fragment_shader(cso);
 542    cso_restore_vertex_shader(cso);
 543    cso_restore_geometry_shader(cso);
 544    cso_restore_vertex_elements(cso);
 545    cso_restore_aux_vertex_buffer_slot(cso);
 546    cso_restore_stream_outputs(cso);
 547
 548    pipe_resource_reference(&vbuf, NULL);
 549 }
 550
 551
 552 static void
 553 reset_cache(struct st_context *st)
 554 {
 555    struct bitmap_cache *cache = st->bitmap.cache;
 556
 557    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 558    cache->empty = GL_TRUE;
 559
 560    cache->xmin = 1000000;
 561    cache->xmax = -1000000;
 562    cache->ymin = 1000000;
 563    cache->ymax = -1000000;
 564
 565    assert(!cache->texture);
 566
 567    /* allocate a new texture */
 568    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 569                                       st->bitmap.tex_format, 0,
 570                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 571                                       1, 1,
 572                                       PIPE_BIND_SAMPLER_VIEW);
 573 }
 574
 575
 576 /** Print bitmap image to stdout (debug) */
 577 static void
 578 print_cache(const struct bitmap_cache *cache)
 579 {
 580    int i, j, k;
 581
 582    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 583       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 584       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 585          if (cache->buffer[k])
 586             printf("X");
 587          else
 588             printf(" ");
 589          k++;
 590       }
 591       printf("\n");
 592    }
 593 }
 594
 595
 596 /**
 597  * Create gallium pipe_transfer object for the bitmap cache.
 598  */
 599 static void
 600 create_cache_trans(struct st_context *st)
 601 {
 602    struct pipe_context *pipe = st->pipe;
 603    struct bitmap_cache *cache = st->bitmap.cache;
 604
 605    if (cache->trans)
 606       return;
 607
 608    /* Map the texture transfer.
 609     * Subsequent glBitmap calls will write into the texture image.
 610     */
 611    cache->buffer = pipe_transfer_map(pipe, cache->texture, 0, 0,
 612                                      PIPE_TRANSFER_WRITE, 0, 0,
 613                                      BITMAP_CACHE_WIDTH,
 614                                      BITMAP_CACHE_HEIGHT, &cache->trans);
 615
 616    /* init image to all 0xff */
 617    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 618 }
 619
 620
 621 /**
 622  * If there's anything in the bitmap cache, draw/flush it now.
 623  */
 624 void
 625 st_flush_bitmap_cache(struct st_context *st)
 626 {
 627    if (!st->bitmap.cache->empty) {
 628       struct bitmap_cache *cache = st->bitmap.cache;
 629
 630       struct pipe_context *pipe = st->pipe;
 631       struct pipe_sampler_view *sv;
 632
 633       assert(cache->xmin <= cache->xmax);
 634
 635 /*    printf("flush size %d x %d  at %d, %d\n",
 636              cache->xmax - cache->xmin,
 637              cache->ymax - cache->ymin,
 638              cache->xpos, cache->ypos);
 639 */
 640
 641       /* The texture transfer has been mapped until now.
 642           * So unmap and release the texture transfer before drawing.
 643           */
 644       if (cache->trans && cache->buffer) {
 645          if (0)
 646             print_cache(cache);
 647          pipe_transfer_unmap(pipe, cache->trans);
 648          cache->buffer = NULL;
 649          cache->trans = NULL;
 650       }
 651
 652       sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 653       if (sv) {
 654          draw_bitmap_quad(st->ctx,
 655                           cache->xpos,
 656                           cache->ypos,
 657                           cache->zpos,
 658                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 659                           sv,
 660                           cache->color);
 661
 662          pipe_sampler_view_reference(&sv, NULL);
 663       }
 664
 665       /* release/free the texture */
 666       pipe_resource_reference(&cache->texture, NULL);
 667
 668       reset_cache(st);
 669    }
 670 }
 671
 672
 673 /**
 674  * Try to accumulate this glBitmap call in the bitmap cache.
 675  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 676  */
 677 static GLboolean
 678 accum_bitmap(struct st_context *st,
 679              GLint x, GLint y, GLsizei width, GLsizei height,
 680              const struct gl_pixelstore_attrib *unpack,
 681              const GLubyte *bitmap )
 682 {
 683    struct bitmap_cache *cache = st->bitmap.cache;
 684    int px = -999, py = -999;
 685    const GLfloat z = st->ctx->Current.RasterPos[2];
 686
 687    if (width > BITMAP_CACHE_WIDTH ||
 688        height > BITMAP_CACHE_HEIGHT)
 689       return GL_FALSE; /* too big to cache */
 690
 691    if (!cache->empty) {
 692       px = x - cache->xpos;  /* pos in buffer */
 693       py = y - cache->ypos;
 694       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 695           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 696           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 697           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 698          /* This bitmap would extend beyond cache bounds, or the bitmap
 699           * color is changing
 700           * so flush and continue.
 701           */
 702          st_flush_bitmap_cache(st);
 703       }
 704    }
 705
 706    if (cache->empty) {
 707       /* Initialize.  Center bitmap vertically in the buffer. */
 708       px = 0;
 709       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 710       cache->xpos = x;
 711       cache->ypos = y - py;
 712       cache->zpos = z;
 713       cache->empty = GL_FALSE;
 714       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 715    }
 716
 717    assert(px != -999);
 718    assert(py != -999);
 719
 720    if (x < cache->xmin)
 721       cache->xmin = x;
 722    if (y < cache->ymin)
 723       cache->ymin = y;
 724    if (x + width > cache->xmax)
 725       cache->xmax = x + width;
 726    if (y + height > cache->ymax)
 727       cache->ymax = y + height;
 728
 729    /* create the transfer if needed */
 730    create_cache_trans(st);
 731
 732    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 733                  cache->buffer, BITMAP_CACHE_WIDTH);
 734
 735    return GL_TRUE; /* accumulated */
 736 }
 737
 738
 739
 740 /**
 741  * Called via ctx->Driver.Bitmap()
 742  */
 743 static void
 744 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 745           GLsizei width, GLsizei height,
 746           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 747 {
 748    struct st_context *st = st_context(ctx);
 749    struct pipe_resource *pt;
 750
 751    if (width == 0 || height == 0)
 752       return;
 753
 754    st_validate_state(st);
 755
 756    if (!st->bitmap.vs) {
 757       /* create pass-through vertex shader now */
 758       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 759                                       TGSI_SEMANTIC_COLOR,
 760                                       TGSI_SEMANTIC_GENERIC };
 761       const uint semantic_indexes[] = { 0, 0, 0 };
 762       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 763                                                           semantic_names,
 764                                                           semantic_indexes);
 765    }
 766
 767    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 768       return;
 769
 770    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 771    if (pt) {
 772       struct pipe_sampler_view *sv =
 773          st_create_texture_sampler_view(st->pipe, pt);
 774
 775       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 776
 777       if (sv) {
 778          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 779                           width, height, sv,
 780                           st->ctx->Current.RasterColor);
 781
 782          pipe_sampler_view_reference(&sv, NULL);
 783       }
 784
 785       /* release/free the texture */
 786       pipe_resource_reference(&pt, NULL);
 787    }
 788 }
 789
 790
 791 /** Per-context init */
 792 void
 793 st_init_bitmap_functions(struct dd_function_table *functions)
 794 {
 795    functions->Bitmap = st_Bitmap;
 796 }
 797
 798
 799 /** Per-context init */
 800 void
 801 st_init_bitmap(struct st_context *st)
 802 {
 803    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 804    struct pipe_context *pipe = st->pipe;
 805    struct pipe_screen *screen = pipe->screen;
 806
 807    /* init sampler state once */
 808    memset(sampler, 0, sizeof(*sampler));
 809    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 810    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 811    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 812    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 813    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 814    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 815    st->bitmap.samplers[1] = *sampler;
 816    st->bitmap.samplers[1].normalized_coords = 1;
 817
 818    /* init baseline rasterizer state once */
 819    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 820    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 821    st->bitmap.rasterizer.depth_clip = 1;
 822
 823    /* find a usable texture format */
 824    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 825                                    PIPE_TEXTURE_2D, 0,
 826                                    PIPE_BIND_SAMPLER_VIEW)) {
 827       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 828    }
 829    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 830                                         PIPE_TEXTURE_2D, 0,
 831                                         PIPE_BIND_SAMPLER_VIEW)) {
 832       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 833    }
 834    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 835                                         PIPE_TEXTURE_2D, 0,
 836                                         PIPE_BIND_SAMPLER_VIEW)) {
 837       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 838    }
 839    else {
 840       /* XXX support more formats */
 841       assert(0);
 842    }
 843
 844    /* alloc bitmap cache object */
 845    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 846
 847    reset_cache(st);
 848 }
 849
 850
 851 /** Per-context tear-down */
 852 void
 853 st_destroy_bitmap(struct st_context *st)
 854 {
 855    struct pipe_context *pipe = st->pipe;
 856    struct bitmap_cache *cache = st->bitmap.cache;
 857
 858    if (st->bitmap.vs) {
 859       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 860       st->bitmap.vs = NULL;
 861    }
 862
 863    if (cache) {
 864       if (cache->trans && cache->buffer) {
 865          pipe_transfer_unmap(pipe, cache->trans);
 866       }
 867       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 868       free(st->bitmap.cache);
 869       st->bitmap.cache = NULL;
 870    }
 871 }