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 "program/program.h"
  39 #include "program/prog_print.h"
  40
  41 #include "st_context.h"
  42 #include "st_atom.h"
  43 #include "st_atom_constbuf.h"
  44 #include "st_program.h"
  45 #include "st_cb_bitmap.h"
  46 #include "st_texture.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_defines.h"
  50 #include "pipe/p_shader_tokens.h"
  51 #include "util/u_inlines.h"
  52 #include "util/u_draw_quad.h"
  53 #include "util/u_simple_shaders.h"
  54 #include "program/prog_instruction.h"
  55 #include "cso_cache/cso_context.h"
  56
  57
  58 #if FEATURE_drawpix
  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 int
 175 find_free_bit(uint bitfield)
 176 {
 177    int i;
 178    for (i = 0; i < 32; i++) {
 179       if ((bitfield & (1 << i)) == 0) {
 180          return i;
 181       }
 182    }
 183    return -1;
 184 }
 185
 186
 187 /**
 188  * Combine basic bitmap fragment program with the user-defined program.
 189  * \param st  current context
 190  * \param fpIn  the incoming fragment program
 191  * \param fpOut  the new fragment program which does fragment culling
 192  * \param bitmap_sampler  sampler number for the bitmap texture
 193  */
 194 void
 195 st_make_bitmap_fragment_program(struct st_context *st,
 196                                 struct gl_fragment_program *fpIn,
 197                                 struct gl_fragment_program **fpOut,
 198                                 GLuint *bitmap_sampler)
 199 {
 200    struct st_fragment_program *bitmap_prog;
 201    struct gl_program *newProg;
 202    uint sampler;
 203
 204    /*
 205     * Generate new program which is the user-defined program prefixed
 206     * with the bitmap sampler/kill instructions.
 207     */
 208    sampler = find_free_bit(fpIn->Base.SamplersUsed);
 209    bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);
 210
 211    newProg = _mesa_combine_programs(st->ctx,
 212                                     &bitmap_prog->Base.Base,
 213                                     &fpIn->Base);
 214    /* done with this after combining */
 215    st_reference_fragprog(st, &bitmap_prog, NULL);
 216
 217 #if 0
 218    {
 219       printf("Combined bitmap program:\n");
 220       _mesa_print_program(newProg);
 221       printf("InputsRead: 0x%x\n", newProg->InputsRead);
 222       printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
 223       _mesa_print_parameter_list(newProg->Parameters);
 224    }
 225 #endif
 226
 227    /* return results */
 228    *fpOut = (struct gl_fragment_program *) newProg;
 229    *bitmap_sampler = sampler;
 230 }
 231
 232
 233 /**
 234  * Copy user-provide bitmap bits into texture buffer, expanding
 235  * bits into texels.
 236  * "On" bits will set texels to 0x0.
 237  * "Off" bits will not modify texels.
 238  * Note that the image is actually going to be upside down in
 239  * the texture.  We deal with that with texcoords.
 240  */
 241 static void
 242 unpack_bitmap(struct st_context *st,
 243               GLint px, GLint py, GLsizei width, GLsizei height,
 244               const struct gl_pixelstore_attrib *unpack,
 245               const GLubyte *bitmap,
 246               ubyte *destBuffer, uint destStride)
 247 {
 248    destBuffer += py * destStride + px;
 249
 250    _mesa_expand_bitmap(width, height, unpack, bitmap,
 251                        destBuffer, destStride, 0x0);
 252 }
 253
 254
 255 /**
 256  * Create a texture which represents a bitmap image.
 257  */
 258 static struct pipe_resource *
 259 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 260                     const struct gl_pixelstore_attrib *unpack,
 261                     const GLubyte *bitmap)
 262 {
 263    struct st_context *st = st_context(ctx);
 264    struct pipe_context *pipe = st->pipe;
 265    struct pipe_transfer *transfer;
 266    ubyte *dest;
 267    struct pipe_resource *pt;
 268
 269    /* PBO source... */
 270    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 271    if (!bitmap) {
 272       return NULL;
 273    }
 274
 275    /**
 276     * Create texture to hold bitmap pattern.
 277     */
 278    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 279                           0, width, height, 1, 1,
 280                           PIPE_BIND_SAMPLER_VIEW);
 281    if (!pt) {
 282       _mesa_unmap_pbo_source(ctx, unpack);
 283       return NULL;
 284    }
 285
 286    transfer = pipe_get_transfer(st->pipe, pt, 0, 0,
 287                                 PIPE_TRANSFER_WRITE,
 288                                 0, 0, width, height);
 289
 290    dest = pipe_transfer_map(pipe, transfer);
 291
 292    /* Put image into texture transfer */
 293    memset(dest, 0xff, height * transfer->stride);
 294    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 295                  dest, transfer->stride);
 296
 297    _mesa_unmap_pbo_source(ctx, unpack);
 298
 299    /* Release transfer */
 300    pipe_transfer_unmap(pipe, transfer);
 301    pipe->transfer_destroy(pipe, transfer);
 302
 303    return pt;
 304 }
 305
 306 static GLuint
 307 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 308                          int x, int y, int width, int height,
 309                          float z, const float color[4])
 310 {
 311    struct pipe_context *pipe = st->pipe;
 312    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 313    const GLfloat fb_width = (GLfloat)fb->Width;
 314    const GLfloat fb_height = (GLfloat)fb->Height;
 315    const GLfloat x0 = (GLfloat)x;
 316    const GLfloat x1 = (GLfloat)(x + width);
 317    const GLfloat y0 = (GLfloat)y;
 318    const GLfloat y1 = (GLfloat)(y + height);
 319    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 320    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 321    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 322    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 323    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 324    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 325    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 326    GLuint i;
 327
 328    if(!normalized)
 329    {
 330       sRight = width;
 331       tBot = height;
 332    }
 333
 334    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 335     * no_flush) updates to buffers where we know there is no conflict
 336     * with previous data.  Currently using max_slots > 1 will cause
 337     * synchronous rendering if the driver flushes its command buffers
 338     * between one bitmap and the next.  Our flush hook below isn't
 339     * sufficient to catch this as the driver doesn't tell us when it
 340     * flushes its own command buffers.  Until this gets fixed, pay the
 341     * price of allocating a new buffer for each bitmap cache-flush to
 342     * avoid synchronous rendering.
 343     */
 344    if (st->bitmap.vbuf_slot >= max_slots) {
 345       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 346       st->bitmap.vbuf_slot = 0;
 347    }
 348
 349    if (!st->bitmap.vbuf) {
 350       st->bitmap.vbuf = pipe_buffer_create(pipe->screen,
 351                                            PIPE_BIND_VERTEX_BUFFER,
 352                                            max_slots *
 353                                            sizeof(st->bitmap.vertices));
 354    }
 355
 356    /* Positions are in clip coords since we need to do clipping in case
 357     * the bitmap quad goes beyond the window bounds.
 358     */
 359    st->bitmap.vertices[0][0][0] = clip_x0;
 360    st->bitmap.vertices[0][0][1] = clip_y0;
 361    st->bitmap.vertices[0][2][0] = sLeft;
 362    st->bitmap.vertices[0][2][1] = tTop;
 363
 364    st->bitmap.vertices[1][0][0] = clip_x1;
 365    st->bitmap.vertices[1][0][1] = clip_y0;
 366    st->bitmap.vertices[1][2][0] = sRight;
 367    st->bitmap.vertices[1][2][1] = tTop;
 368
 369    st->bitmap.vertices[2][0][0] = clip_x1;
 370    st->bitmap.vertices[2][0][1] = clip_y1;
 371    st->bitmap.vertices[2][2][0] = sRight;
 372    st->bitmap.vertices[2][2][1] = tBot;
 373
 374    st->bitmap.vertices[3][0][0] = clip_x0;
 375    st->bitmap.vertices[3][0][1] = clip_y1;
 376    st->bitmap.vertices[3][2][0] = sLeft;
 377    st->bitmap.vertices[3][2][1] = tBot;
 378
 379    /* same for all verts: */
 380    for (i = 0; i < 4; i++) {
 381       st->bitmap.vertices[i][0][2] = z;
 382       st->bitmap.vertices[i][0][3] = 1.0;
 383       st->bitmap.vertices[i][1][0] = color[0];
 384       st->bitmap.vertices[i][1][1] = color[1];
 385       st->bitmap.vertices[i][1][2] = color[2];
 386       st->bitmap.vertices[i][1][3] = color[3];
 387       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 388       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 389    }
 390
 391    /* put vertex data into vbuf */
 392    pipe_buffer_write_nooverlap(st->pipe,
 393                                st->bitmap.vbuf,
 394                                st->bitmap.vbuf_slot
 395                                * sizeof(st->bitmap.vertices),
 396                                sizeof st->bitmap.vertices,
 397                                st->bitmap.vertices);
 398
 399    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 400 }
 401
 402
 403
 404 /**
 405  * Render a glBitmap by drawing a textured quad
 406  */
 407 static void
 408 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 409                  GLsizei width, GLsizei height,
 410                  struct pipe_sampler_view *sv,
 411                  const GLfloat *color)
 412 {
 413    struct st_context *st = st_context(ctx);
 414    struct pipe_context *pipe = st->pipe;
 415    struct cso_context *cso = st->cso_context;
 416    struct st_fp_variant *fpv;
 417    struct st_fp_variant_key key;
 418    GLuint maxSize;
 419    GLuint offset;
 420
 421    memset(&key, 0, sizeof(key));
 422    key.st = st;
 423    key.bitmap = GL_TRUE;
 424
 425    fpv = st_get_fp_variant(st, st->fp, &key);
 426
 427    /* As an optimization, Mesa's fragment programs will sometimes get the
 428     * primary color from a statevar/constant rather than a varying variable.
 429     * when that's the case, we need to ensure that we use the 'color'
 430     * parameter and not the current attribute color (which may have changed
 431     * through glRasterPos and state validation.
 432     * So, we force the proper color here.  Not elegant, but it works.
 433     */
 434    {
 435       GLfloat colorSave[4];
 436       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 437       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 438       st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
 439       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 440    }
 441
 442
 443    /* limit checks */
 444    /* XXX if the bitmap is larger than the max texture size, break
 445     * it up into chunks.
 446     */
 447    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 448                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 449    assert(width <= (GLsizei)maxSize);
 450    assert(height <= (GLsizei)maxSize);
 451
 452    cso_save_rasterizer(cso);
 453    cso_save_samplers(cso);
 454    cso_save_fragment_sampler_views(cso);
 455    cso_save_viewport(cso);
 456    cso_save_fragment_shader(cso);
 457    cso_save_vertex_shader(cso);
 458    cso_save_vertex_elements(cso);
 459    cso_save_vertex_buffers(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    /* user samplers, plus our bitmap sampler */
 472    {
 473       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 474       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_samplers);
 475       uint i;
 476       for (i = 0; i < st->state.num_samplers; i++) {
 477          samplers[i] = &st->state.samplers[i];
 478       }
 479       samplers[fpv->bitmap_sampler] =
 480          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 481       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 482    }
 483
 484    /* user textures, plus the bitmap texture */
 485    {
 486       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 487       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_textures);
 488       memcpy(sampler_views, st->state.sampler_views, sizeof(sampler_views));
 489       sampler_views[fpv->bitmap_sampler] = sv;
 490       cso_set_fragment_sampler_views(cso, num, sampler_views);
 491    }
 492
 493    /* viewport state: viewport matching window dims */
 494    {
 495       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 496       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 497       const GLfloat width = (GLfloat)fb->Width;
 498       const GLfloat height = (GLfloat)fb->Height;
 499       struct pipe_viewport_state vp;
 500       vp.scale[0] =  0.5f * width;
 501       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 502       vp.scale[2] = 0.5f;
 503       vp.scale[3] = 1.0f;
 504       vp.translate[0] = 0.5f * width;
 505       vp.translate[1] = 0.5f * height;
 506       vp.translate[2] = 0.5f;
 507       vp.translate[3] = 0.0f;
 508       cso_set_viewport(cso, &vp);
 509    }
 510
 511    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 512
 513    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 514    z = z * 2.0 - 1.0;
 515
 516    /* draw textured quad */
 517    offset = setup_bitmap_vertex_data(st,
 518                                      sv->texture->target != PIPE_TEXTURE_RECT,
 519                                      x, y, width, height, z, color);
 520
 521    util_draw_vertex_buffer(pipe, st->cso_context, st->bitmap.vbuf, offset,
 522                            PIPE_PRIM_TRIANGLE_FAN,
 523                            4,  /* verts */
 524                            3); /* attribs/vert */
 525
 526
 527    /* restore state */
 528    cso_restore_rasterizer(cso);
 529    cso_restore_samplers(cso);
 530    cso_restore_fragment_sampler_views(cso);
 531    cso_restore_viewport(cso);
 532    cso_restore_fragment_shader(cso);
 533    cso_restore_vertex_shader(cso);
 534    cso_restore_vertex_elements(cso);
 535    cso_restore_vertex_buffers(cso);
 536 }
 537
 538
 539 static void
 540 reset_cache(struct st_context *st)
 541 {
 542    struct pipe_context *pipe = st->pipe;
 543    struct bitmap_cache *cache = st->bitmap.cache;
 544
 545    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 546    cache->empty = GL_TRUE;
 547
 548    cache->xmin = 1000000;
 549    cache->xmax = -1000000;
 550    cache->ymin = 1000000;
 551    cache->ymax = -1000000;
 552
 553    if (cache->trans) {
 554       pipe->transfer_destroy(pipe, cache->trans);
 555       cache->trans = NULL;
 556    }
 557
 558    assert(!cache->texture);
 559
 560    /* allocate a new texture */
 561    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 562                                       st->bitmap.tex_format, 0,
 563                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 564                                       1, 1,
 565                                       PIPE_BIND_SAMPLER_VIEW);
 566 }
 567
 568
 569 /** Print bitmap image to stdout (debug) */
 570 static void
 571 print_cache(const struct bitmap_cache *cache)
 572 {
 573    int i, j, k;
 574
 575    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 576       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 577       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 578          if (cache->buffer[k])
 579             printf("X");
 580          else
 581             printf(" ");
 582          k++;
 583       }
 584       printf("\n");
 585    }
 586 }
 587
 588
 589 /**
 590  * Create gallium pipe_transfer object for the bitmap cache.
 591  */
 592 static void
 593 create_cache_trans(struct st_context *st)
 594 {
 595    struct pipe_context *pipe = st->pipe;
 596    struct bitmap_cache *cache = st->bitmap.cache;
 597
 598    if (cache->trans)
 599       return;
 600
 601    /* Map the texture transfer.
 602     * Subsequent glBitmap calls will write into the texture image.
 603     */
 604    cache->trans = pipe_get_transfer(st->pipe, cache->texture, 0, 0,
 605                                     PIPE_TRANSFER_WRITE, 0, 0,
 606                                     BITMAP_CACHE_WIDTH,
 607                                     BITMAP_CACHE_HEIGHT);
 608    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 609
 610    /* init image to all 0xff */
 611    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 612 }
 613
 614
 615 /**
 616  * If there's anything in the bitmap cache, draw/flush it now.
 617  */
 618 void
 619 st_flush_bitmap_cache(struct st_context *st)
 620 {
 621    if (!st->bitmap.cache->empty) {
 622       struct bitmap_cache *cache = st->bitmap.cache;
 623
 624       if (st->ctx->DrawBuffer) {
 625          struct pipe_context *pipe = st->pipe;
 626          struct pipe_sampler_view *sv;
 627
 628          assert(cache->xmin <= cache->xmax);
 629
 630 /*         printf("flush size %d x %d  at %d, %d\n",
 631                 cache->xmax - cache->xmin,
 632                 cache->ymax - cache->ymin,
 633                 cache->xpos, cache->ypos);
 634 */
 635
 636          /* The texture transfer has been mapped until now.
 637           * So unmap and release the texture transfer before drawing.
 638           */
 639          if (cache->trans) {
 640             if (0)
 641                print_cache(cache);
 642             pipe_transfer_unmap(pipe, cache->trans);
 643             cache->buffer = NULL;
 644
 645             pipe->transfer_destroy(pipe, cache->trans);
 646             cache->trans = NULL;
 647          }
 648
 649          sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 650          if (sv) {
 651             draw_bitmap_quad(st->ctx,
 652                              cache->xpos,
 653                              cache->ypos,
 654                              cache->zpos,
 655                              BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 656                              sv,
 657                              cache->color);
 658
 659             pipe_sampler_view_reference(&sv, NULL);
 660          }
 661       }
 662
 663       /* release/free the texture */
 664       pipe_resource_reference(&cache->texture, NULL);
 665
 666       reset_cache(st);
 667    }
 668 }
 669
 670
 671 /**
 672  * Flush bitmap cache and release vertex buffer.
 673  */
 674 void
 675 st_flush_bitmap( struct st_context *st )
 676 {
 677    st_flush_bitmap_cache(st);
 678
 679    /* Release vertex buffer to avoid synchronous rendering if we were
 680     * to map it in the next frame.
 681     */
 682    pipe_resource_reference(&st->bitmap.vbuf, NULL);
 683    st->bitmap.vbuf_slot = 0;
 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
 836    /* find a usable texture format */
 837    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 838                                    PIPE_TEXTURE_2D, 0,
 839                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 840       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 841    }
 842    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 843                                         PIPE_TEXTURE_2D, 0,
 844                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 845       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 846    }
 847    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 848                                         PIPE_TEXTURE_2D, 0,
 849                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 850       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 851    }
 852    else {
 853       /* XXX support more formats */
 854       assert(0);
 855    }
 856
 857    /* alloc bitmap cache object */
 858    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 859
 860    reset_cache(st);
 861 }
 862
 863
 864 /** Per-context tear-down */
 865 void
 866 st_destroy_bitmap(struct st_context *st)
 867 {
 868    struct pipe_context *pipe = st->pipe;
 869    struct bitmap_cache *cache = st->bitmap.cache;
 870
 871    if (st->bitmap.vs) {
 872       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 873       st->bitmap.vs = NULL;
 874    }
 875
 876    if (st->bitmap.vbuf) {
 877       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 878       st->bitmap.vbuf = NULL;
 879    }
 880
 881    if (cache) {
 882       if (cache->trans) {
 883          pipe_transfer_unmap(pipe, cache->trans);
 884          pipe->transfer_destroy(pipe, cache->trans);
 885       }
 886       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 887       free(st->bitmap.cache);
 888       st->bitmap.cache = NULL;
 889    }
 890 }
 891
 892 #endif /* FEATURE_drawpix */