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 "program/program.h"
  38 #include "program/prog_print.h"
  39
  40 #include "st_context.h"
  41 #include "st_atom.h"
  42 #include "st_atom_constbuf.h"
  43 #include "st_program.h"
  44 #include "st_cb_bitmap.h"
  45 #include "st_texture.h"
  46
  47 #include "pipe/p_context.h"
  48 #include "pipe/p_defines.h"
  49 #include "pipe/p_shader_tokens.h"
  50 #include "util/u_inlines.h"
  51 #include "util/u_draw_quad.h"
  52 #include "util/u_simple_shaders.h"
  53 #include "program/prog_instruction.h"
  54 #include "cso_cache/cso_context.h"
  55
  56
  57 #if FEATURE_drawpix
  58
  59 /**
  60  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  61  * is stored in a texture image.  An alpha8 texture format is used.
  62  * The fragment shader samples a bit (texel) from the texture, then
  63  * discards the fragment if the bit is off.
  64  *
  65  * Note that we actually store the inverse image of the bitmap to
  66  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  67  * and an "off" bit is stored as texel=0xff.  Then we kill the
  68  * fragment if the negated texel value is less than zero.
  69  */
  70
  71
  72 /**
  73  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  74  * buffer which is then rendered en mass upon a flush, state change, etc.
  75  * A wide, short buffer is used to target the common case of a series
  76  * of glBitmap calls being used to draw text.
  77  */
  78 static GLboolean UseBitmapCache = GL_TRUE;
  79
  80
  81 #define BITMAP_CACHE_WIDTH  512
  82 #define BITMAP_CACHE_HEIGHT 32
  83
  84 struct bitmap_cache
  85 {
  86    /** Window pos to render the cached image */
  87    GLint xpos, ypos;
  88    /** Bounds of region used in window coords */
  89    GLint xmin, ymin, xmax, ymax;
  90
  91    GLfloat color[4];
  92
  93    /** Bitmap's Z position */
  94    GLfloat zpos;
  95
  96    struct pipe_resource *texture;
  97    struct pipe_transfer *trans;
  98
  99    GLboolean empty;
 100
 101    /** An I8 texture image: */
 102    ubyte *buffer;
 103 };
 104
 105
 106 /** Epsilon for Z comparisons */
 107 #define Z_EPSILON 1e-06
 108
 109
 110 /**
 111  * Make fragment program for glBitmap:
 112  *   Sample the texture and kill the fragment if the bit is 0.
 113  * This program will be combined with the user's fragment program.
 114  */
 115 static struct st_fragment_program *
 116 make_bitmap_fragment_program(struct gl_context *ctx, GLuint samplerIndex)
 117 {
 118    struct st_context *st = st_context(ctx);
 119    struct st_fragment_program *stfp;
 120    struct gl_program *p;
 121    GLuint ic = 0;
 122
 123    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 124    if (!p)
 125       return NULL;
 126
 127    p->NumInstructions = 3;
 128
 129    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 130    if (!p->Instructions) {
 131       ctx->Driver.DeleteProgram(ctx, p);
 132       return NULL;
 133    }
 134    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 135
 136    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 137    p->Instructions[ic].Opcode = OPCODE_TEX;
 138    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 139    p->Instructions[ic].DstReg.Index = 0;
 140    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 141    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 142    p->Instructions[ic].TexSrcUnit = samplerIndex;
 143    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 144    ic++;
 145
 146    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 147    p->Instructions[ic].Opcode = OPCODE_KIL;
 148    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 149
 150    if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 151       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 152
 153    p->Instructions[ic].SrcReg[0].Index = 0;
 154    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 155    ic++;
 156
 157    /* END; */
 158    p->Instructions[ic++].Opcode = OPCODE_END;
 159
 160    assert(ic == p->NumInstructions);
 161
 162    p->InputsRead = FRAG_BIT_TEX0;
 163    p->OutputsWritten = 0x0;
 164    p->SamplersUsed = (1 << samplerIndex);
 165
 166    stfp = (struct st_fragment_program *) p;
 167    stfp->Base.UsesKill = GL_TRUE;
 168
 169    return stfp;
 170 }
 171
 172
 173 static int
 174 find_free_bit(uint bitfield)
 175 {
 176    int i;
 177    for (i = 0; i < 32; i++) {
 178       if ((bitfield & (1 << i)) == 0) {
 179          return i;
 180       }
 181    }
 182    return -1;
 183 }
 184
 185
 186 /**
 187  * Combine basic bitmap fragment program with the user-defined program.
 188  * \param st  current context
 189  * \param fpIn  the incoming fragment program
 190  * \param fpOut  the new fragment program which does fragment culling
 191  * \param bitmap_sampler  sampler number for the bitmap texture
 192  */
 193 void
 194 st_make_bitmap_fragment_program(struct st_context *st,
 195                                 struct gl_fragment_program *fpIn,
 196                                 struct gl_fragment_program **fpOut,
 197                                 GLuint *bitmap_sampler)
 198 {
 199    struct st_fragment_program *bitmap_prog;
 200    struct gl_program *newProg;
 201    uint sampler;
 202
 203    /*
 204     * Generate new program which is the user-defined program prefixed
 205     * with the bitmap sampler/kill instructions.
 206     */
 207    sampler = find_free_bit(fpIn->Base.SamplersUsed);
 208    bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);
 209
 210    newProg = _mesa_combine_programs(st->ctx,
 211                                     &bitmap_prog->Base.Base,
 212                                     &fpIn->Base);
 213    /* done with this after combining */
 214    st_reference_fragprog(st, &bitmap_prog, NULL);
 215
 216 #if 0
 217    {
 218       printf("Combined bitmap program:\n");
 219       _mesa_print_program(newProg);
 220       printf("InputsRead: 0x%x\n", newProg->InputsRead);
 221       printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
 222       _mesa_print_parameter_list(newProg->Parameters);
 223    }
 224 #endif
 225
 226    /* return results */
 227    *fpOut = (struct gl_fragment_program *) newProg;
 228    *bitmap_sampler = sampler;
 229 }
 230
 231
 232 /**
 233  * Copy user-provide bitmap bits into texture buffer, expanding
 234  * bits into texels.
 235  * "On" bits will set texels to 0x0.
 236  * "Off" bits will not modify texels.
 237  * Note that the image is actually going to be upside down in
 238  * the texture.  We deal with that with texcoords.
 239  */
 240 static void
 241 unpack_bitmap(struct st_context *st,
 242               GLint px, GLint py, GLsizei width, GLsizei height,
 243               const struct gl_pixelstore_attrib *unpack,
 244               const GLubyte *bitmap,
 245               ubyte *destBuffer, uint destStride)
 246 {
 247    destBuffer += py * destStride + px;
 248
 249    _mesa_expand_bitmap(width, height, unpack, bitmap,
 250                        destBuffer, destStride, 0x0);
 251 }
 252
 253
 254 /**
 255  * Create a texture which represents a bitmap image.
 256  */
 257 static struct pipe_resource *
 258 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 259                     const struct gl_pixelstore_attrib *unpack,
 260                     const GLubyte *bitmap)
 261 {
 262    struct st_context *st = st_context(ctx);
 263    struct pipe_context *pipe = st->pipe;
 264    struct pipe_transfer *transfer;
 265    ubyte *dest;
 266    struct pipe_resource *pt;
 267
 268    /* PBO source... */
 269    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 270    if (!bitmap) {
 271       return NULL;
 272    }
 273
 274    /**
 275     * Create texture to hold bitmap pattern.
 276     */
 277    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 278                           0, width, height, 1,
 279                           PIPE_BIND_SAMPLER_VIEW);
 280    if (!pt) {
 281       _mesa_unmap_pbo_source(ctx, unpack);
 282       return NULL;
 283    }
 284
 285    transfer = pipe_get_transfer(st->pipe, pt, 0, 0,
 286                                 PIPE_TRANSFER_WRITE,
 287                                 0, 0, width, height);
 288
 289    dest = pipe_transfer_map(pipe, transfer);
 290
 291    /* Put image into texture transfer */
 292    memset(dest, 0xff, height * transfer->stride);
 293    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 294                  dest, transfer->stride);
 295
 296    _mesa_unmap_pbo_source(ctx, unpack);
 297
 298    /* Release transfer */
 299    pipe_transfer_unmap(pipe, transfer);
 300    pipe->transfer_destroy(pipe, transfer);
 301
 302    return pt;
 303 }
 304
 305 static GLuint
 306 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 307                          int x, int y, int width, int height,
 308                          float z, const float color[4])
 309 {
 310    struct pipe_context *pipe = st->pipe;
 311    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 312    const GLfloat fb_width = (GLfloat)fb->Width;
 313    const GLfloat fb_height = (GLfloat)fb->Height;
 314    const GLfloat x0 = (GLfloat)x;
 315    const GLfloat x1 = (GLfloat)(x + width);
 316    const GLfloat y0 = (GLfloat)y;
 317    const GLfloat y1 = (GLfloat)(y + height);
 318    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 319    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 320    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 321    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 322    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 323    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 324    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 325    GLuint i;
 326
 327    if(!normalized)
 328    {
 329       sRight = width;
 330       tBot = height;
 331    }
 332
 333    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 334     * no_flush) updates to buffers where we know there is no conflict
 335     * with previous data.  Currently using max_slots > 1 will cause
 336     * synchronous rendering if the driver flushes its command buffers
 337     * between one bitmap and the next.  Our flush hook below isn't
 338     * sufficient to catch this as the driver doesn't tell us when it
 339     * flushes its own command buffers.  Until this gets fixed, pay the
 340     * price of allocating a new buffer for each bitmap cache-flush to
 341     * avoid synchronous rendering.
 342     */
 343    if (st->bitmap.vbuf_slot >= max_slots) {
 344       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 345       st->bitmap.vbuf_slot = 0;
 346    }
 347
 348    if (!st->bitmap.vbuf) {
 349       st->bitmap.vbuf = pipe_buffer_create(pipe->screen,
 350                                            PIPE_BIND_VERTEX_BUFFER,
 351                                            max_slots *
 352                                            sizeof(st->bitmap.vertices));
 353    }
 354
 355    /* Positions are in clip coords since we need to do clipping in case
 356     * the bitmap quad goes beyond the window bounds.
 357     */
 358    st->bitmap.vertices[0][0][0] = clip_x0;
 359    st->bitmap.vertices[0][0][1] = clip_y0;
 360    st->bitmap.vertices[0][2][0] = sLeft;
 361    st->bitmap.vertices[0][2][1] = tTop;
 362
 363    st->bitmap.vertices[1][0][0] = clip_x1;
 364    st->bitmap.vertices[1][0][1] = clip_y0;
 365    st->bitmap.vertices[1][2][0] = sRight;
 366    st->bitmap.vertices[1][2][1] = tTop;
 367
 368    st->bitmap.vertices[2][0][0] = clip_x1;
 369    st->bitmap.vertices[2][0][1] = clip_y1;
 370    st->bitmap.vertices[2][2][0] = sRight;
 371    st->bitmap.vertices[2][2][1] = tBot;
 372
 373    st->bitmap.vertices[3][0][0] = clip_x0;
 374    st->bitmap.vertices[3][0][1] = clip_y1;
 375    st->bitmap.vertices[3][2][0] = sLeft;
 376    st->bitmap.vertices[3][2][1] = tBot;
 377
 378    /* same for all verts: */
 379    for (i = 0; i < 4; i++) {
 380       st->bitmap.vertices[i][0][2] = z;
 381       st->bitmap.vertices[i][0][3] = 1.0;
 382       st->bitmap.vertices[i][1][0] = color[0];
 383       st->bitmap.vertices[i][1][1] = color[1];
 384       st->bitmap.vertices[i][1][2] = color[2];
 385       st->bitmap.vertices[i][1][3] = color[3];
 386       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 387       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 388    }
 389
 390    /* put vertex data into vbuf */
 391    pipe_buffer_write_nooverlap(st->pipe,
 392                                st->bitmap.vbuf,
 393                                st->bitmap.vbuf_slot
 394                                * sizeof(st->bitmap.vertices),
 395                                sizeof st->bitmap.vertices,
 396                                st->bitmap.vertices);
 397
 398    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 399 }
 400
 401
 402
 403 /**
 404  * Render a glBitmap by drawing a textured quad
 405  */
 406 static void
 407 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 408                  GLsizei width, GLsizei height,
 409                  struct pipe_sampler_view *sv,
 410                  const GLfloat *color)
 411 {
 412    struct st_context *st = st_context(ctx);
 413    struct pipe_context *pipe = st->pipe;
 414    struct cso_context *cso = st->cso_context;
 415    struct st_fp_variant *fpv;
 416    struct st_fp_variant_key key;
 417    GLuint maxSize;
 418    GLuint offset;
 419
 420    memset(&key, 0, sizeof(key));
 421    key.st = st;
 422    key.bitmap = GL_TRUE;
 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);
 453    cso_save_fragment_sampler_views(cso);
 454    cso_save_viewport(cso);
 455    cso_save_fragment_shader(cso);
 456    cso_save_vertex_shader(cso);
 457    cso_save_vertex_elements(cso);
 458
 459    /* rasterizer state: just scissor */
 460    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 461    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 462
 463    /* fragment shader state: TEX lookup program */
 464    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 465
 466    /* vertex shader state: position + texcoord pass-through */
 467    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 468
 469    /* user samplers, plus our bitmap sampler */
 470    {
 471       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 472       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_samplers);
 473       uint i;
 474       for (i = 0; i < st->state.num_samplers; i++) {
 475          samplers[i] = &st->state.samplers[i];
 476       }
 477       samplers[fpv->bitmap_sampler] =
 478          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 479       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 480    }
 481
 482    /* user textures, plus the bitmap texture */
 483    {
 484       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 485       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_textures);
 486       memcpy(sampler_views, st->state.sampler_views, sizeof(sampler_views));
 487       sampler_views[fpv->bitmap_sampler] = sv;
 488       cso_set_fragment_sampler_views(cso, num, sampler_views);
 489    }
 490
 491    /* viewport state: viewport matching window dims */
 492    {
 493       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 494       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 495       const GLfloat width = (GLfloat)fb->Width;
 496       const GLfloat height = (GLfloat)fb->Height;
 497       struct pipe_viewport_state vp;
 498       vp.scale[0] =  0.5f * width;
 499       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 500       vp.scale[2] = 0.5f;
 501       vp.scale[3] = 1.0f;
 502       vp.translate[0] = 0.5f * width;
 503       vp.translate[1] = 0.5f * height;
 504       vp.translate[2] = 0.5f;
 505       vp.translate[3] = 0.0f;
 506       cso_set_viewport(cso, &vp);
 507    }
 508
 509    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 510
 511    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 512    z = z * 2.0 - 1.0;
 513
 514    /* draw textured quad */
 515    offset = setup_bitmap_vertex_data(st,
 516                                      sv->texture->target != PIPE_TEXTURE_RECT,
 517                                      x, y, width, height, z, color);
 518
 519    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 520                            PIPE_PRIM_TRIANGLE_FAN,
 521                            4,  /* verts */
 522                            3); /* attribs/vert */
 523
 524
 525    /* restore state */
 526    cso_restore_rasterizer(cso);
 527    cso_restore_samplers(cso);
 528    cso_restore_fragment_sampler_views(cso);
 529    cso_restore_viewport(cso);
 530    cso_restore_fragment_shader(cso);
 531    cso_restore_vertex_shader(cso);
 532    cso_restore_vertex_elements(cso);
 533 }
 534
 535
 536 static void
 537 reset_cache(struct st_context *st)
 538 {
 539    struct pipe_context *pipe = st->pipe;
 540    struct bitmap_cache *cache = st->bitmap.cache;
 541
 542    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 543    cache->empty = GL_TRUE;
 544
 545    cache->xmin = 1000000;
 546    cache->xmax = -1000000;
 547    cache->ymin = 1000000;
 548    cache->ymax = -1000000;
 549
 550    if (cache->trans) {
 551       pipe->transfer_destroy(pipe, cache->trans);
 552       cache->trans = NULL;
 553    }
 554
 555    assert(!cache->texture);
 556
 557    /* allocate a new texture */
 558    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 559                                       st->bitmap.tex_format, 0,
 560                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 561                                       1,
 562                                       PIPE_BIND_SAMPLER_VIEW);
 563 }
 564
 565
 566 /** Print bitmap image to stdout (debug) */
 567 static void
 568 print_cache(const struct bitmap_cache *cache)
 569 {
 570    int i, j, k;
 571
 572    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 573       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 574       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 575          if (cache->buffer[k])
 576             printf("X");
 577          else
 578             printf(" ");
 579          k++;
 580       }
 581       printf("\n");
 582    }
 583 }
 584
 585
 586 /**
 587  * Create gallium pipe_transfer object for the bitmap cache.
 588  */
 589 static void
 590 create_cache_trans(struct st_context *st)
 591 {
 592    struct pipe_context *pipe = st->pipe;
 593    struct bitmap_cache *cache = st->bitmap.cache;
 594
 595    if (cache->trans)
 596       return;
 597
 598    /* Map the texture transfer.
 599     * Subsequent glBitmap calls will write into the texture image.
 600     */
 601    cache->trans = pipe_get_transfer(st->pipe, cache->texture, 0, 0,
 602                                     PIPE_TRANSFER_WRITE, 0, 0,
 603                                     BITMAP_CACHE_WIDTH,
 604                                     BITMAP_CACHE_HEIGHT);
 605    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 606
 607    /* init image to all 0xff */
 608    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 609 }
 610
 611
 612 /**
 613  * If there's anything in the bitmap cache, draw/flush it now.
 614  */
 615 void
 616 st_flush_bitmap_cache(struct st_context *st)
 617 {
 618    if (!st->bitmap.cache->empty) {
 619       struct bitmap_cache *cache = st->bitmap.cache;
 620
 621       if (st->ctx->DrawBuffer) {
 622          struct pipe_context *pipe = st->pipe;
 623          struct pipe_sampler_view *sv;
 624
 625          assert(cache->xmin <= cache->xmax);
 626
 627 /*         printf("flush size %d x %d  at %d, %d\n",
 628                 cache->xmax - cache->xmin,
 629                 cache->ymax - cache->ymin,
 630                 cache->xpos, cache->ypos);
 631 */
 632
 633          /* The texture transfer has been mapped until now.
 634           * So unmap and release the texture transfer before drawing.
 635           */
 636          if (cache->trans) {
 637             if (0)
 638                print_cache(cache);
 639             pipe_transfer_unmap(pipe, cache->trans);
 640             cache->buffer = NULL;
 641
 642             pipe->transfer_destroy(pipe, cache->trans);
 643             cache->trans = NULL;
 644          }
 645
 646          sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 647          if (sv) {
 648             draw_bitmap_quad(st->ctx,
 649                              cache->xpos,
 650                              cache->ypos,
 651                              cache->zpos,
 652                              BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 653                              sv,
 654                              cache->color);
 655
 656             pipe_sampler_view_reference(&sv, NULL);
 657          }
 658       }
 659
 660       /* release/free the texture */
 661       pipe_resource_reference(&cache->texture, NULL);
 662
 663       reset_cache(st);
 664    }
 665 }
 666
 667
 668 /**
 669  * Flush bitmap cache and release vertex buffer.
 670  */
 671 void
 672 st_flush_bitmap( struct st_context *st )
 673 {
 674    st_flush_bitmap_cache(st);
 675
 676    /* Release vertex buffer to avoid synchronous rendering if we were
 677     * to map it in the next frame.
 678     */
 679    pipe_resource_reference(&st->bitmap.vbuf, NULL);
 680    st->bitmap.vbuf_slot = 0;
 681 }
 682
 683
 684 /**
 685  * Try to accumulate this glBitmap call in the bitmap cache.
 686  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 687  */
 688 static GLboolean
 689 accum_bitmap(struct st_context *st,
 690              GLint x, GLint y, GLsizei width, GLsizei height,
 691              const struct gl_pixelstore_attrib *unpack,
 692              const GLubyte *bitmap )
 693 {
 694    struct bitmap_cache *cache = st->bitmap.cache;
 695    int px = -999, py = -999;
 696    const GLfloat z = st->ctx->Current.RasterPos[2];
 697
 698    if (width > BITMAP_CACHE_WIDTH ||
 699        height > BITMAP_CACHE_HEIGHT)
 700       return GL_FALSE; /* too big to cache */
 701
 702    if (!cache->empty) {
 703       px = x - cache->xpos;  /* pos in buffer */
 704       py = y - cache->ypos;
 705       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 706           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 707           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 708           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 709          /* This bitmap would extend beyond cache bounds, or the bitmap
 710           * color is changing
 711           * so flush and continue.
 712           */
 713          st_flush_bitmap_cache(st);
 714       }
 715    }
 716
 717    if (cache->empty) {
 718       /* Initialize.  Center bitmap vertically in the buffer. */
 719       px = 0;
 720       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 721       cache->xpos = x;
 722       cache->ypos = y - py;
 723       cache->zpos = z;
 724       cache->empty = GL_FALSE;
 725       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 726    }
 727
 728    assert(px != -999);
 729    assert(py != -999);
 730
 731    if (x < cache->xmin)
 732       cache->xmin = x;
 733    if (y < cache->ymin)
 734       cache->ymin = y;
 735    if (x + width > cache->xmax)
 736       cache->xmax = x + width;
 737    if (y + height > cache->ymax)
 738       cache->ymax = y + height;
 739
 740    /* create the transfer if needed */
 741    create_cache_trans(st);
 742
 743    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 744                  cache->buffer, BITMAP_CACHE_WIDTH);
 745
 746    return GL_TRUE; /* accumulated */
 747 }
 748
 749
 750
 751 /**
 752  * Called via ctx->Driver.Bitmap()
 753  */
 754 static void
 755 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 756           GLsizei width, GLsizei height,
 757           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 758 {
 759    struct st_context *st = st_context(ctx);
 760    struct pipe_resource *pt;
 761
 762    if (width == 0 || height == 0)
 763       return;
 764
 765    st_validate_state(st);
 766
 767    if (!st->bitmap.vs) {
 768       /* create pass-through vertex shader now */
 769       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 770                                       TGSI_SEMANTIC_COLOR,
 771                                       TGSI_SEMANTIC_GENERIC };
 772       const uint semantic_indexes[] = { 0, 0, 0 };
 773       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 774                                                           semantic_names,
 775                                                           semantic_indexes);
 776    }
 777
 778    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 779       return;
 780
 781    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 782    if (pt) {
 783       struct pipe_sampler_view *sv =
 784          st_create_texture_sampler_view(st->pipe, pt);
 785
 786       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 787
 788       if (sv) {
 789          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 790                           width, height, sv,
 791                           st->ctx->Current.RasterColor);
 792
 793          pipe_sampler_view_reference(&sv, NULL);
 794       }
 795
 796       /* release/free the texture */
 797       pipe_resource_reference(&pt, NULL);
 798    }
 799 }
 800
 801
 802 /** Per-context init */
 803 void
 804 st_init_bitmap_functions(struct dd_function_table *functions)
 805 {
 806    functions->Bitmap = st_Bitmap;
 807 }
 808
 809
 810 /** Per-context init */
 811 void
 812 st_init_bitmap(struct st_context *st)
 813 {
 814    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 815    struct pipe_context *pipe = st->pipe;
 816    struct pipe_screen *screen = pipe->screen;
 817
 818    /* init sampler state once */
 819    memset(sampler, 0, sizeof(*sampler));
 820    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 821    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 822    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 823    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 824    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 825    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 826    st->bitmap.samplers[1] = *sampler;
 827    st->bitmap.samplers[1].normalized_coords = 1;
 828
 829    /* init baseline rasterizer state once */
 830    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 831    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 832
 833    /* find a usable texture format */
 834    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 835                                    PIPE_TEXTURE_2D, 0,
 836                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 837       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 838    }
 839    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 840                                         PIPE_TEXTURE_2D, 0,
 841                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 842       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 843    }
 844    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 845                                         PIPE_TEXTURE_2D, 0,
 846                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 847       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 848    }
 849    else {
 850       /* XXX support more formats */
 851       assert(0);
 852    }
 853
 854    /* alloc bitmap cache object */
 855    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 856
 857    reset_cache(st);
 858 }
 859
 860
 861 /** Per-context tear-down */
 862 void
 863 st_destroy_bitmap(struct st_context *st)
 864 {
 865    struct pipe_context *pipe = st->pipe;
 866    struct bitmap_cache *cache = st->bitmap.cache;
 867
 868    if (st->bitmap.vs) {
 869       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 870       st->bitmap.vs = NULL;
 871    }
 872
 873    if (st->bitmap.vbuf) {
 874       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 875       st->bitmap.vbuf = NULL;
 876    }
 877
 878    if (cache) {
 879       if (cache->trans) {
 880          pipe_transfer_unmap(pipe, cache->trans);
 881          pipe->transfer_destroy(pipe, cache->trans);
 882       }
 883       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 884       free(st->bitmap.cache);
 885       st->bitmap.cache = NULL;
 886    }
 887 }
 888
 889 #endif /* FEATURE_drawpix */