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 #if FEATURE_drawpix
  61
  62 /**
  63  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  64  * is stored in a texture image.  An alpha8 texture format is used.
  65  * The fragment shader samples a bit (texel) from the texture, then
  66  * discards the fragment if the bit is off.
  67  *
  68  * Note that we actually store the inverse image of the bitmap to
  69  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  70  * and an "off" bit is stored as texel=0xff.  Then we kill the
  71  * fragment if the negated texel value is less than zero.
  72  */
  73
  74
  75 /**
  76  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  77  * buffer which is then rendered en mass upon a flush, state change, etc.
  78  * A wide, short buffer is used to target the common case of a series
  79  * of glBitmap calls being used to draw text.
  80  */
  81 static GLboolean UseBitmapCache = GL_TRUE;
  82
  83
  84 #define BITMAP_CACHE_WIDTH  512
  85 #define BITMAP_CACHE_HEIGHT 32
  86
  87 struct bitmap_cache
  88 {
  89    /** Window pos to render the cached image */
  90    GLint xpos, ypos;
  91    /** Bounds of region used in window coords */
  92    GLint xmin, ymin, xmax, ymax;
  93
  94    GLfloat color[4];
  95
  96    /** Bitmap's Z position */
  97    GLfloat zpos;
  98
  99    struct pipe_resource *texture;
 100    struct pipe_transfer *trans;
 101
 102    GLboolean empty;
 103
 104    /** An I8 texture image: */
 105    ubyte *buffer;
 106 };
 107
 108
 109 /** Epsilon for Z comparisons */
 110 #define Z_EPSILON 1e-06
 111
 112
 113 /**
 114  * Make fragment program for glBitmap:
 115  *   Sample the texture and kill the fragment if the bit is 0.
 116  * This program will be combined with the user's fragment program.
 117  */
 118 static struct st_fragment_program *
 119 make_bitmap_fragment_program(struct gl_context *ctx, GLuint samplerIndex)
 120 {
 121    struct st_context *st = st_context(ctx);
 122    struct st_fragment_program *stfp;
 123    struct gl_program *p;
 124    GLuint ic = 0;
 125
 126    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 127    if (!p)
 128       return NULL;
 129
 130    p->NumInstructions = 3;
 131
 132    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 133    if (!p->Instructions) {
 134       ctx->Driver.DeleteProgram(ctx, p);
 135       return NULL;
 136    }
 137    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 138
 139    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 140    p->Instructions[ic].Opcode = OPCODE_TEX;
 141    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 142    p->Instructions[ic].DstReg.Index = 0;
 143    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 144    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 145    p->Instructions[ic].TexSrcUnit = samplerIndex;
 146    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 147    ic++;
 148
 149    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 150    p->Instructions[ic].Opcode = OPCODE_KIL;
 151    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 152
 153    if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 154       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 155
 156    p->Instructions[ic].SrcReg[0].Index = 0;
 157    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 158    ic++;
 159
 160    /* END; */
 161    p->Instructions[ic++].Opcode = OPCODE_END;
 162
 163    assert(ic == p->NumInstructions);
 164
 165    p->InputsRead = FRAG_BIT_TEX0;
 166    p->OutputsWritten = 0x0;
 167    p->SamplersUsed = (1 << samplerIndex);
 168
 169    stfp = (struct st_fragment_program *) p;
 170    stfp->Base.UsesKill = GL_TRUE;
 171
 172    return stfp;
 173 }
 174
 175
 176 static struct gl_program *
 177 make_bitmap_fragment_program_glsl(struct st_context *st,
 178                                   struct st_fragment_program *orig,
 179                                   GLuint samplerIndex)
 180 {
 181    struct gl_context *ctx = st->ctx;
 182    struct st_fragment_program *fp = (struct st_fragment_program *)
 183       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 184
 185    if (!fp)
 186       return NULL;
 187
 188    get_bitmap_visitor(fp, orig->glsl_to_tgsi, samplerIndex);
 189    return &fp->Base.Base;
 190 }
 191
 192
 193 static int
 194 find_free_bit(uint bitfield)
 195 {
 196    int i;
 197    for (i = 0; i < 32; i++) {
 198       if ((bitfield & (1 << i)) == 0) {
 199          return i;
 200       }
 201    }
 202    return -1;
 203 }
 204
 205
 206 /**
 207  * Combine basic bitmap fragment program with the user-defined program.
 208  * \param st  current context
 209  * \param fpIn  the incoming fragment program
 210  * \param fpOut  the new fragment program which does fragment culling
 211  * \param bitmap_sampler  sampler number for the bitmap texture
 212  */
 213 void
 214 st_make_bitmap_fragment_program(struct st_context *st,
 215                                 struct gl_fragment_program *fpIn,
 216                                 struct gl_fragment_program **fpOut,
 217                                 GLuint *bitmap_sampler)
 218 {
 219    struct st_fragment_program *bitmap_prog;
 220    struct st_fragment_program *stfpIn = (struct st_fragment_program *) fpIn;
 221    struct gl_program *newProg;
 222    uint sampler;
 223
 224    /*
 225     * Generate new program which is the user-defined program prefixed
 226     * with the bitmap sampler/kill instructions.
 227     */
 228    sampler = find_free_bit(fpIn->Base.SamplersUsed);
 229
 230    if (stfpIn->glsl_to_tgsi)
 231       newProg = make_bitmap_fragment_program_glsl(st, stfpIn, sampler);
 232    else {
 233       bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);
 234
 235       newProg = _mesa_combine_programs(st->ctx,
 236                                        &bitmap_prog->Base.Base,
 237                                        &fpIn->Base);
 238       /* done with this after combining */
 239       st_reference_fragprog(st, &bitmap_prog, NULL);
 240    }
 241
 242 #if 0
 243    {
 244       printf("Combined bitmap program:\n");
 245       _mesa_print_program(newProg);
 246       printf("InputsRead: 0x%x\n", newProg->InputsRead);
 247       printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
 248       _mesa_print_parameter_list(newProg->Parameters);
 249    }
 250 #endif
 251
 252    /* return results */
 253    *fpOut = (struct gl_fragment_program *) newProg;
 254    *bitmap_sampler = sampler;
 255 }
 256
 257
 258 /**
 259  * Copy user-provide bitmap bits into texture buffer, expanding
 260  * bits into texels.
 261  * "On" bits will set texels to 0x0.
 262  * "Off" bits will not modify texels.
 263  * Note that the image is actually going to be upside down in
 264  * the texture.  We deal with that with texcoords.
 265  */
 266 static void
 267 unpack_bitmap(struct st_context *st,
 268               GLint px, GLint py, GLsizei width, GLsizei height,
 269               const struct gl_pixelstore_attrib *unpack,
 270               const GLubyte *bitmap,
 271               ubyte *destBuffer, uint destStride)
 272 {
 273    destBuffer += py * destStride + px;
 274
 275    _mesa_expand_bitmap(width, height, unpack, bitmap,
 276                        destBuffer, destStride, 0x0);
 277 }
 278
 279
 280 /**
 281  * Create a texture which represents a bitmap image.
 282  */
 283 static struct pipe_resource *
 284 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 285                     const struct gl_pixelstore_attrib *unpack,
 286                     const GLubyte *bitmap)
 287 {
 288    struct st_context *st = st_context(ctx);
 289    struct pipe_context *pipe = st->pipe;
 290    struct pipe_transfer *transfer;
 291    ubyte *dest;
 292    struct pipe_resource *pt;
 293
 294    /* PBO source... */
 295    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 296    if (!bitmap) {
 297       return NULL;
 298    }
 299
 300    /**
 301     * Create texture to hold bitmap pattern.
 302     */
 303    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 304                           0, width, height, 1, 1,
 305                           PIPE_BIND_SAMPLER_VIEW);
 306    if (!pt) {
 307       _mesa_unmap_pbo_source(ctx, unpack);
 308       return NULL;
 309    }
 310
 311    transfer = pipe_get_transfer(st->pipe, pt, 0, 0,
 312                                 PIPE_TRANSFER_WRITE,
 313                                 0, 0, width, height);
 314
 315    dest = pipe_transfer_map(pipe, transfer);
 316
 317    /* Put image into texture transfer */
 318    memset(dest, 0xff, height * transfer->stride);
 319    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 320                  dest, transfer->stride);
 321
 322    _mesa_unmap_pbo_source(ctx, unpack);
 323
 324    /* Release transfer */
 325    pipe_transfer_unmap(pipe, transfer);
 326    pipe->transfer_destroy(pipe, transfer);
 327
 328    return pt;
 329 }
 330
 331 static void
 332 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 333                          int x, int y, int width, int height,
 334                          float z, const float color[4],
 335                          struct pipe_resource **vbuf,
 336                          unsigned *vbuf_offset)
 337 {
 338    const GLfloat fb_width = (GLfloat)st->state.framebuffer.width;
 339    const GLfloat fb_height = (GLfloat)st->state.framebuffer.height;
 340    const GLfloat x0 = (GLfloat)x;
 341    const GLfloat x1 = (GLfloat)(x + width);
 342    const GLfloat y0 = (GLfloat)y;
 343    const GLfloat y1 = (GLfloat)(y + height);
 344    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 345    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 346    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 347    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 348    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 349    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 350    GLuint i;
 351    float (*vertices)[3][4];  /**< vertex pos + color + texcoord */
 352
 353    if(!normalized)
 354    {
 355       sRight = (GLfloat) width;
 356       tBot = (GLfloat) height;
 357    }
 358
 359    u_upload_alloc(st->uploader, 0, 4 * sizeof(vertices[0]), vbuf_offset, vbuf,
 360                   (void**)&vertices);
 361    if (!vbuf) {
 362       return;
 363    }
 364
 365    /* Positions are in clip coords since we need to do clipping in case
 366     * the bitmap quad goes beyond the window bounds.
 367     */
 368    vertices[0][0][0] = clip_x0;
 369    vertices[0][0][1] = clip_y0;
 370    vertices[0][2][0] = sLeft;
 371    vertices[0][2][1] = tTop;
 372
 373    vertices[1][0][0] = clip_x1;
 374    vertices[1][0][1] = clip_y0;
 375    vertices[1][2][0] = sRight;
 376    vertices[1][2][1] = tTop;
 377
 378    vertices[2][0][0] = clip_x1;
 379    vertices[2][0][1] = clip_y1;
 380    vertices[2][2][0] = sRight;
 381    vertices[2][2][1] = tBot;
 382
 383    vertices[3][0][0] = clip_x0;
 384    vertices[3][0][1] = clip_y1;
 385    vertices[3][2][0] = sLeft;
 386    vertices[3][2][1] = tBot;
 387
 388    /* same for all verts: */
 389    for (i = 0; i < 4; i++) {
 390       vertices[i][0][2] = z;
 391       vertices[i][0][3] = 1.0f;
 392       vertices[i][1][0] = color[0];
 393       vertices[i][1][1] = color[1];
 394       vertices[i][1][2] = color[2];
 395       vertices[i][1][3] = color[3];
 396       vertices[i][2][2] = 0.0; /*R*/
 397       vertices[i][2][3] = 1.0; /*Q*/
 398    }
 399
 400    u_upload_unmap(st->uploader);
 401 }
 402
 403
 404
 405 /**
 406  * Render a glBitmap by drawing a textured quad
 407  */
 408 static void
 409 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 410                  GLsizei width, GLsizei height,
 411                  struct pipe_sampler_view *sv,
 412                  const GLfloat *color)
 413 {
 414    struct st_context *st = st_context(ctx);
 415    struct pipe_context *pipe = st->pipe;
 416    struct cso_context *cso = st->cso_context;
 417    struct st_fp_variant *fpv;
 418    struct st_fp_variant_key key;
 419    GLuint maxSize;
 420    GLuint offset;
 421    struct pipe_resource *vbuf = NULL;
 422
 423    memset(&key, 0, sizeof(key));
 424    key.st = st;
 425    key.bitmap = GL_TRUE;
 426    key.clamp_color = st->clamp_frag_color_in_shader &&
 427                      st->ctx->Color._ClampFragmentColor &&
 428                      !st->ctx->DrawBuffer->_IntegerColor;
 429
 430    fpv = st_get_fp_variant(st, st->fp, &key);
 431
 432    /* As an optimization, Mesa's fragment programs will sometimes get the
 433     * primary color from a statevar/constant rather than a varying variable.
 434     * when that's the case, we need to ensure that we use the 'color'
 435     * parameter and not the current attribute color (which may have changed
 436     * through glRasterPos and state validation.
 437     * So, we force the proper color here.  Not elegant, but it works.
 438     */
 439    {
 440       GLfloat colorSave[4];
 441       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 442       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 443       st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
 444       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 445    }
 446
 447
 448    /* limit checks */
 449    /* XXX if the bitmap is larger than the max texture size, break
 450     * it up into chunks.
 451     */
 452    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 453                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 454    assert(width <= (GLsizei)maxSize);
 455    assert(height <= (GLsizei)maxSize);
 456
 457    cso_save_rasterizer(cso);
 458    cso_save_samplers(cso, PIPE_SHADER_FRAGMENT);
 459    cso_save_sampler_views(cso, PIPE_SHADER_FRAGMENT);
 460    cso_save_viewport(cso);
 461    cso_save_fragment_shader(cso);
 462    cso_save_stream_outputs(cso);
 463    cso_save_vertex_shader(cso);
 464    cso_save_geometry_shader(cso);
 465    cso_save_vertex_elements(cso);
 466    cso_save_vertex_buffers(cso);
 467
 468    /* rasterizer state: just scissor */
 469    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 470    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 471
 472    /* fragment shader state: TEX lookup program */
 473    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 474
 475    /* vertex shader state: position + texcoord pass-through */
 476    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 477
 478    /* geometry shader state: disabled */
 479    cso_set_geometry_shader_handle(cso, NULL);
 480
 481    /* user samplers, plus our bitmap sampler */
 482    {
 483       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 484       uint num = MAX2(fpv->bitmap_sampler + 1,
 485                       st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 486       uint i;
 487       for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {
 488          samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];
 489       }
 490       samplers[fpv->bitmap_sampler] =
 491          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 492       cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,
 493                        (const struct pipe_sampler_state **) samplers);
 494    }
 495
 496    /* user textures, plus the bitmap texture */
 497    {
 498       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 499       uint num = MAX2(fpv->bitmap_sampler + 1,
 500                       st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 501       memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 502              sizeof(sampler_views));
 503       sampler_views[fpv->bitmap_sampler] = sv;
 504       cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);
 505    }
 506
 507    /* viewport state: viewport matching window dims */
 508    {
 509       const GLboolean invert = st->state.fb_orientation == Y_0_TOP;
 510       const GLfloat width = (GLfloat)st->state.framebuffer.width;
 511       const GLfloat height = (GLfloat)st->state.framebuffer.height;
 512       struct pipe_viewport_state vp;
 513       vp.scale[0] =  0.5f * width;
 514       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 515       vp.scale[2] = 0.5f;
 516       vp.scale[3] = 1.0f;
 517       vp.translate[0] = 0.5f * width;
 518       vp.translate[1] = 0.5f * height;
 519       vp.translate[2] = 0.5f;
 520       vp.translate[3] = 0.0f;
 521       cso_set_viewport(cso, &vp);
 522    }
 523
 524    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 525    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 526
 527    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 528    z = z * 2.0f - 1.0f;
 529
 530    /* draw textured quad */
 531    setup_bitmap_vertex_data(st, sv->texture->target != PIPE_TEXTURE_RECT,
 532                             x, y, width, height, z, color, &vbuf, &offset);
 533
 534    if (vbuf) {
 535       util_draw_vertex_buffer(pipe, st->cso_context, vbuf, offset,
 536                               PIPE_PRIM_TRIANGLE_FAN,
 537                               4,  /* verts */
 538                               3); /* attribs/vert */
 539    }
 540
 541    /* restore state */
 542    cso_restore_rasterizer(cso);
 543    cso_restore_samplers(cso, PIPE_SHADER_FRAGMENT);
 544    cso_restore_sampler_views(cso, PIPE_SHADER_FRAGMENT);
 545    cso_restore_viewport(cso);
 546    cso_restore_fragment_shader(cso);
 547    cso_restore_vertex_shader(cso);
 548    cso_restore_geometry_shader(cso);
 549    cso_restore_vertex_elements(cso);
 550    cso_restore_vertex_buffers(cso);
 551    cso_restore_stream_outputs(cso);
 552
 553    pipe_resource_reference(&vbuf, NULL);
 554 }
 555
 556
 557 static void
 558 reset_cache(struct st_context *st)
 559 {
 560    struct pipe_context *pipe = st->pipe;
 561    struct bitmap_cache *cache = st->bitmap.cache;
 562
 563    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 564    cache->empty = GL_TRUE;
 565
 566    cache->xmin = 1000000;
 567    cache->xmax = -1000000;
 568    cache->ymin = 1000000;
 569    cache->ymax = -1000000;
 570
 571    if (cache->trans) {
 572       pipe->transfer_destroy(pipe, cache->trans);
 573       cache->trans = NULL;
 574    }
 575
 576    assert(!cache->texture);
 577
 578    /* allocate a new texture */
 579    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 580                                       st->bitmap.tex_format, 0,
 581                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 582                                       1, 1,
 583                                       PIPE_BIND_SAMPLER_VIEW);
 584 }
 585
 586
 587 /** Print bitmap image to stdout (debug) */
 588 static void
 589 print_cache(const struct bitmap_cache *cache)
 590 {
 591    int i, j, k;
 592
 593    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 594       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 595       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 596          if (cache->buffer[k])
 597             printf("X");
 598          else
 599             printf(" ");
 600          k++;
 601       }
 602       printf("\n");
 603    }
 604 }
 605
 606
 607 /**
 608  * Create gallium pipe_transfer object for the bitmap cache.
 609  */
 610 static void
 611 create_cache_trans(struct st_context *st)
 612 {
 613    struct pipe_context *pipe = st->pipe;
 614    struct bitmap_cache *cache = st->bitmap.cache;
 615
 616    if (cache->trans)
 617       return;
 618
 619    /* Map the texture transfer.
 620     * Subsequent glBitmap calls will write into the texture image.
 621     */
 622    cache->trans = pipe_get_transfer(st->pipe, cache->texture, 0, 0,
 623                                     PIPE_TRANSFER_WRITE, 0, 0,
 624                                     BITMAP_CACHE_WIDTH,
 625                                     BITMAP_CACHE_HEIGHT);
 626    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 627
 628    /* init image to all 0xff */
 629    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 630 }
 631
 632
 633 /**
 634  * If there's anything in the bitmap cache, draw/flush it now.
 635  */
 636 void
 637 st_flush_bitmap_cache(struct st_context *st)
 638 {
 639    if (!st->bitmap.cache->empty) {
 640       struct bitmap_cache *cache = st->bitmap.cache;
 641
 642       struct pipe_context *pipe = st->pipe;
 643       struct pipe_sampler_view *sv;
 644
 645       assert(cache->xmin <= cache->xmax);
 646
 647 /*    printf("flush size %d x %d  at %d, %d\n",
 648              cache->xmax - cache->xmin,
 649              cache->ymax - cache->ymin,
 650              cache->xpos, cache->ypos);
 651 */
 652
 653       /* The texture transfer has been mapped until now.
 654           * So unmap and release the texture transfer before drawing.
 655           */
 656       if (cache->trans) {
 657          if (0)
 658             print_cache(cache);
 659          pipe_transfer_unmap(pipe, cache->trans);
 660          cache->buffer = NULL;
 661
 662          pipe->transfer_destroy(pipe, cache->trans);
 663          cache->trans = NULL;
 664       }
 665
 666       sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 667       if (sv) {
 668          draw_bitmap_quad(st->ctx,
 669                           cache->xpos,
 670                           cache->ypos,
 671                           cache->zpos,
 672                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 673                           sv,
 674                           cache->color);
 675
 676          pipe_sampler_view_reference(&sv, NULL);
 677       }
 678
 679       /* release/free the texture */
 680       pipe_resource_reference(&cache->texture, NULL);
 681
 682       reset_cache(st);
 683    }
 684 }
 685
 686
 687 /**
 688  * Try to accumulate this glBitmap call in the bitmap cache.
 689  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 690  */
 691 static GLboolean
 692 accum_bitmap(struct st_context *st,
 693              GLint x, GLint y, GLsizei width, GLsizei height,
 694              const struct gl_pixelstore_attrib *unpack,
 695              const GLubyte *bitmap )
 696 {
 697    struct bitmap_cache *cache = st->bitmap.cache;
 698    int px = -999, py = -999;
 699    const GLfloat z = st->ctx->Current.RasterPos[2];
 700
 701    if (width > BITMAP_CACHE_WIDTH ||
 702        height > BITMAP_CACHE_HEIGHT)
 703       return GL_FALSE; /* too big to cache */
 704
 705    if (!cache->empty) {
 706       px = x - cache->xpos;  /* pos in buffer */
 707       py = y - cache->ypos;
 708       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 709           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 710           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 711           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 712          /* This bitmap would extend beyond cache bounds, or the bitmap
 713           * color is changing
 714           * so flush and continue.
 715           */
 716          st_flush_bitmap_cache(st);
 717       }
 718    }
 719
 720    if (cache->empty) {
 721       /* Initialize.  Center bitmap vertically in the buffer. */
 722       px = 0;
 723       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 724       cache->xpos = x;
 725       cache->ypos = y - py;
 726       cache->zpos = z;
 727       cache->empty = GL_FALSE;
 728       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 729    }
 730
 731    assert(px != -999);
 732    assert(py != -999);
 733
 734    if (x < cache->xmin)
 735       cache->xmin = x;
 736    if (y < cache->ymin)
 737       cache->ymin = y;
 738    if (x + width > cache->xmax)
 739       cache->xmax = x + width;
 740    if (y + height > cache->ymax)
 741       cache->ymax = y + height;
 742
 743    /* create the transfer if needed */
 744    create_cache_trans(st);
 745
 746    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 747                  cache->buffer, BITMAP_CACHE_WIDTH);
 748
 749    return GL_TRUE; /* accumulated */
 750 }
 751
 752
 753
 754 /**
 755  * Called via ctx->Driver.Bitmap()
 756  */
 757 static void
 758 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 759           GLsizei width, GLsizei height,
 760           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 761 {
 762    struct st_context *st = st_context(ctx);
 763    struct pipe_resource *pt;
 764
 765    if (width == 0 || height == 0)
 766       return;
 767
 768    st_validate_state(st);
 769
 770    if (!st->bitmap.vs) {
 771       /* create pass-through vertex shader now */
 772       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 773                                       TGSI_SEMANTIC_COLOR,
 774                                       TGSI_SEMANTIC_GENERIC };
 775       const uint semantic_indexes[] = { 0, 0, 0 };
 776       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 777                                                           semantic_names,
 778                                                           semantic_indexes);
 779    }
 780
 781    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 782       return;
 783
 784    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 785    if (pt) {
 786       struct pipe_sampler_view *sv =
 787          st_create_texture_sampler_view(st->pipe, pt);
 788
 789       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 790
 791       if (sv) {
 792          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 793                           width, height, sv,
 794                           st->ctx->Current.RasterColor);
 795
 796          pipe_sampler_view_reference(&sv, NULL);
 797       }
 798
 799       /* release/free the texture */
 800       pipe_resource_reference(&pt, NULL);
 801    }
 802 }
 803
 804
 805 /** Per-context init */
 806 void
 807 st_init_bitmap_functions(struct dd_function_table *functions)
 808 {
 809    functions->Bitmap = st_Bitmap;
 810 }
 811
 812
 813 /** Per-context init */
 814 void
 815 st_init_bitmap(struct st_context *st)
 816 {
 817    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 818    struct pipe_context *pipe = st->pipe;
 819    struct pipe_screen *screen = pipe->screen;
 820
 821    /* init sampler state once */
 822    memset(sampler, 0, sizeof(*sampler));
 823    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 824    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 825    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 826    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 827    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 828    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 829    st->bitmap.samplers[1] = *sampler;
 830    st->bitmap.samplers[1].normalized_coords = 1;
 831
 832    /* init baseline rasterizer state once */
 833    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 834    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 835    st->bitmap.rasterizer.depth_clip = 1;
 836
 837    /* find a usable texture format */
 838    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 839                                    PIPE_TEXTURE_2D, 0,
 840                                    PIPE_BIND_SAMPLER_VIEW)) {
 841       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 842    }
 843    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 844                                         PIPE_TEXTURE_2D, 0,
 845                                         PIPE_BIND_SAMPLER_VIEW)) {
 846       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 847    }
 848    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 849                                         PIPE_TEXTURE_2D, 0,
 850                                         PIPE_BIND_SAMPLER_VIEW)) {
 851       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 852    }
 853    else {
 854       /* XXX support more formats */
 855       assert(0);
 856    }
 857
 858    /* alloc bitmap cache object */
 859    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 860
 861    reset_cache(st);
 862 }
 863
 864
 865 /** Per-context tear-down */
 866 void
 867 st_destroy_bitmap(struct st_context *st)
 868 {
 869    struct pipe_context *pipe = st->pipe;
 870    struct bitmap_cache *cache = st->bitmap.cache;
 871
 872    if (st->bitmap.vs) {
 873       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 874       st->bitmap.vs = NULL;
 875    }
 876
 877    if (cache) {
 878       if (cache->trans) {
 879          pipe_transfer_unmap(pipe, cache->trans);
 880          pipe->transfer_destroy(pipe, cache->trans);
 881       }
 882       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 883       free(st->bitmap.cache);
 884       st->bitmap.cache = NULL;
 885    }
 886 }
 887
 888 #endif /* FEATURE_drawpix */