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/texformat.h"
  38 #include "shader/program.h"
  39 #include "shader/prog_parameter.h"
  40 #include "shader/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_cb_program.h"
  48 #include "st_mesa_to_tgsi.h"
  49 #include "st_texture.h"
  50 #include "st_inlines.h"
  51
  52 #include "pipe/p_context.h"
  53 #include "pipe/p_defines.h"
  54 #include "pipe/p_inlines.h"
  55 #include "util/u_tile.h"
  56 #include "util/u_draw_quad.h"
  57 #include "util/u_simple_shaders.h"
  58 #include "shader/prog_instruction.h"
  59 #include "cso_cache/cso_context.h"
  60
  61
  62
  63 /**
  64  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  65  * is stored in a texture image.  An alpha8 texture format is used.
  66  * The fragment shader samples a bit (texel) from the texture, then
  67  * discards the fragment if the bit is off.
  68  *
  69  * Note that we actually store the inverse image of the bitmap to
  70  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  71  * and an "off" bit is stored as texel=0xff.  Then we kill the
  72  * fragment if the negated texel value is less than zero.
  73  */
  74
  75
  76 /**
  77  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  78  * buffer which is then rendered en mass upon a flush, state change, etc.
  79  * A wide, short buffer is used to target the common case of a series
  80  * of glBitmap calls being used to draw text.
  81  */
  82 static GLboolean UseBitmapCache = GL_TRUE;
  83
  84
  85 #define BITMAP_CACHE_WIDTH  512
  86 #define BITMAP_CACHE_HEIGHT 32
  87
  88 struct bitmap_cache
  89 {
  90    /** Window pos to render the cached image */
  91    GLint xpos, ypos;
  92    /** Bounds of region used in window coords */
  93    GLint xmin, ymin, xmax, ymax;
  94
  95    GLfloat color[4];
  96
  97    struct pipe_texture *texture;
  98    struct pipe_transfer *trans;
  99
 100    GLboolean empty;
 101
 102    /** An I8 texture image: */
 103    ubyte *buffer;
 104 };
 105
 106
 107
 108
 109 /**
 110  * Make fragment program for glBitmap:
 111  *   Sample the texture and kill the fragment if the bit is 0.
 112  * This program will be combined with the user's fragment program.
 113  */
 114 static struct st_fragment_program *
 115 make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex)
 116 {
 117    struct st_fragment_program *stfp;
 118    struct gl_program *p;
 119    GLuint ic = 0;
 120
 121    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 122    if (!p)
 123       return NULL;
 124
 125    p->NumInstructions = 3;
 126
 127    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 128    if (!p->Instructions) {
 129       ctx->Driver.DeleteProgram(ctx, p);
 130       return NULL;
 131    }
 132    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 133
 134    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 135    p->Instructions[ic].Opcode = OPCODE_TEX;
 136    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 137    p->Instructions[ic].DstReg.Index = 0;
 138    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 139    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 140    p->Instructions[ic].TexSrcUnit = samplerIndex;
 141    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 142    ic++;
 143
 144    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 145    p->Instructions[ic].Opcode = OPCODE_KIL;
 146    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 147
 148    if (ctx->st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 149       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 150
 151    p->Instructions[ic].SrcReg[0].Index = 0;
 152    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 153    ic++;
 154
 155    /* END; */
 156    p->Instructions[ic++].Opcode = OPCODE_END;
 157
 158    assert(ic == p->NumInstructions);
 159
 160    p->InputsRead = FRAG_BIT_TEX0;
 161    p->OutputsWritten = 0x0;
 162    p->SamplersUsed = (1 << samplerIndex);
 163
 164    stfp = (struct st_fragment_program *) p;
 165    stfp->Base.UsesKill = GL_TRUE;
 166
 167    /* No need to send this incomplete program down to hardware:
 168     *
 169     * st_translate_fragment_program(ctx->st, stfp, NULL);
 170     */
 171
 172    return stfp;
 173 }
 174
 175
 176 static int
 177 find_free_bit(uint bitfield)
 178 {
 179    int i;
 180    for (i = 0; i < 32; i++) {
 181       if ((bitfield & (1 << i)) == 0) {
 182          return i;
 183       }
 184    }
 185    return -1;
 186 }
 187
 188
 189 /**
 190  * Combine basic bitmap fragment program with the user-defined program.
 191  */
 192 static struct st_fragment_program *
 193 combined_bitmap_fragment_program(GLcontext *ctx)
 194 {
 195    struct st_context *st = ctx->st;
 196    struct st_fragment_program *stfp = st->fp;
 197
 198    if (!stfp->bitmap_program) {
 199       /*
 200        * Generate new program which is the user-defined program prefixed
 201        * with the bitmap sampler/kill instructions.
 202        */
 203       struct st_fragment_program *bitmap_prog;
 204       uint sampler;
 205
 206       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 207       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 208
 209       stfp->bitmap_program = (struct st_fragment_program *)
 210          _mesa_combine_programs(ctx,
 211                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 212       stfp->bitmap_program->bitmap_sampler = sampler;
 213
 214       /* done with this after combining */
 215       st_reference_fragprog(st, &bitmap_prog, NULL);
 216
 217 #if 0
 218       {
 219          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 220          printf("Combined bitmap program:\n");
 221          _mesa_print_program(p);
 222          printf("InputsRead: 0x%x\n", p->InputsRead);
 223          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 224          _mesa_print_parameter_list(p->Parameters);
 225       }
 226 #endif
 227
 228       /* translate to TGSI tokens */
 229       st_translate_fragment_program(st, stfp->bitmap_program, NULL);
 230    }
 231
 232    return stfp->bitmap_program;
 233 }
 234
 235
 236 /**
 237  * Copy user-provide bitmap bits into texture buffer, expanding
 238  * bits into texels.
 239  * "On" bits will set texels to 0xff.
 240  * "Off" bits will not modify texels.
 241  * Note that the image is actually going to be upside down in
 242  * the texture.  We deal with that with texcoords.
 243  */
 244 static void
 245 unpack_bitmap(struct st_context *st,
 246               GLint px, GLint py, GLsizei width, GLsizei height,
 247               const struct gl_pixelstore_attrib *unpack,
 248               const GLubyte *bitmap,
 249               ubyte *destBuffer, uint destStride)
 250 {
 251    GLint row, col;
 252
 253 #define SET_PIXEL(COL, ROW) \
 254    destBuffer[(py + (ROW)) * destStride + px + (COL)] = 0x0;
 255
 256    for (row = 0; row < height; row++) {
 257       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 258                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 259
 260       if (unpack->LsbFirst) {
 261          /* Lsb first */
 262          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 263          for (col = 0; col < width; col++) {
 264
 265             if (*src & mask) {
 266                SET_PIXEL(col, row);
 267             }
 268
 269             if (mask == 128U) {
 270                src++;
 271                mask = 1U;
 272             }
 273             else {
 274                mask = mask << 1;
 275             }
 276          }
 277
 278          /* get ready for next row */
 279          if (mask != 1)
 280             src++;
 281       }
 282       else {
 283          /* Msb first */
 284          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 285          for (col = 0; col < width; col++) {
 286
 287             if (*src & mask) {
 288                SET_PIXEL(col, row);
 289             }
 290
 291             if (mask == 1U) {
 292                src++;
 293                mask = 128U;
 294             }
 295             else {
 296                mask = mask >> 1;
 297             }
 298          }
 299
 300          /* get ready for next row */
 301          if (mask != 128)
 302             src++;
 303       }
 304
 305    } /* row */
 306
 307 #undef SET_PIXEL
 308 }
 309
 310
 311 /**
 312  * Create a texture which represents a bitmap image.
 313  */
 314 static struct pipe_texture *
 315 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 316                     const struct gl_pixelstore_attrib *unpack,
 317                     const GLubyte *bitmap)
 318 {
 319    struct pipe_context *pipe = ctx->st->pipe;
 320    struct pipe_screen *screen = pipe->screen;
 321    struct pipe_transfer *transfer;
 322    ubyte *dest;
 323    struct pipe_texture *pt;
 324
 325    /* PBO source... */
 326    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 327    if (!bitmap) {
 328       return NULL;
 329    }
 330
 331    /**
 332     * Create texture to hold bitmap pattern.
 333     */
 334    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format,
 335                           0, width, height, 1,
 336                           PIPE_TEXTURE_USAGE_SAMPLER);
 337    if (!pt) {
 338       _mesa_unmap_bitmap_pbo(ctx, unpack);
 339       return NULL;
 340    }
 341
 342    transfer = st_no_flush_get_tex_transfer(st_context(ctx), pt, 0, 0, 0,
 343                                            PIPE_TRANSFER_WRITE,
 344                                            0, 0, width, height);
 345
 346    dest = screen->transfer_map(screen, transfer);
 347
 348    /* Put image into texture transfer */
 349    memset(dest, 0xff, height * transfer->stride);
 350    unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap,
 351                  dest, transfer->stride);
 352
 353    _mesa_unmap_bitmap_pbo(ctx, unpack);
 354
 355    /* Release transfer */
 356    screen->transfer_unmap(screen, transfer);
 357    screen->tex_transfer_destroy(transfer);
 358
 359    return pt;
 360 }
 361
 362 static GLuint
 363 setup_bitmap_vertex_data(struct st_context *st,
 364                          int x, int y, int width, int height,
 365                          float z, const float color[4])
 366 {
 367    struct pipe_context *pipe = st->pipe;
 368    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 369    const GLfloat fb_width = (GLfloat)fb->Width;
 370    const GLfloat fb_height = (GLfloat)fb->Height;
 371    const GLfloat x0 = (GLfloat)x;
 372    const GLfloat x1 = (GLfloat)(x + width);
 373    const GLfloat y0 = (GLfloat)y;
 374    const GLfloat y1 = (GLfloat)(y + height);
 375    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 376    const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 377    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 378    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 379    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 380    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 381    const GLuint max_slots = 4096 / sizeof(st->bitmap.vertices);
 382    GLuint i;
 383
 384    if (st->bitmap.vbuf_slot >= max_slots) {
 385       pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 386       st->bitmap.vbuf_slot = 0;
 387    }
 388
 389    if (!st->bitmap.vbuf) {
 390       st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32,
 391                                            PIPE_BUFFER_USAGE_VERTEX,
 392                                            max_slots * sizeof(st->bitmap.vertices));
 393    }
 394
 395    /* Positions are in clip coords since we need to do clipping in case
 396     * the bitmap quad goes beyond the window bounds.
 397     */
 398    st->bitmap.vertices[0][0][0] = clip_x0;
 399    st->bitmap.vertices[0][0][1] = clip_y0;
 400    st->bitmap.vertices[0][2][0] = sLeft;
 401    st->bitmap.vertices[0][2][1] = tTop;
 402
 403    st->bitmap.vertices[1][0][0] = clip_x1;
 404    st->bitmap.vertices[1][0][1] = clip_y0;
 405    st->bitmap.vertices[1][2][0] = sRight;
 406    st->bitmap.vertices[1][2][1] = tTop;
 407
 408    st->bitmap.vertices[2][0][0] = clip_x1;
 409    st->bitmap.vertices[2][0][1] = clip_y1;
 410    st->bitmap.vertices[2][2][0] = sRight;
 411    st->bitmap.vertices[2][2][1] = tBot;
 412
 413    st->bitmap.vertices[3][0][0] = clip_x0;
 414    st->bitmap.vertices[3][0][1] = clip_y1;
 415    st->bitmap.vertices[3][2][0] = sLeft;
 416    st->bitmap.vertices[3][2][1] = tBot;
 417
 418    /* same for all verts: */
 419    for (i = 0; i < 4; i++) {
 420       st->bitmap.vertices[i][0][2] = z;
 421       st->bitmap.vertices[i][0][3] = 1.0;
 422       st->bitmap.vertices[i][1][0] = color[0];
 423       st->bitmap.vertices[i][1][1] = color[1];
 424       st->bitmap.vertices[i][1][2] = color[2];
 425       st->bitmap.vertices[i][1][3] = color[3];
 426       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 427       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 428    }
 429
 430    /* put vertex data into vbuf */
 431    st_no_flush_pipe_buffer_write(st,
 432                                  st->bitmap.vbuf,
 433                                  st->bitmap.vbuf_slot * sizeof st->bitmap.vertices,
 434                                  sizeof st->bitmap.vertices,
 435                                  st->bitmap.vertices);
 436
 437    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 438 }
 439
 440
 441
 442 /**
 443  * Render a glBitmap by drawing a textured quad
 444  */
 445 static void
 446 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 447                  GLsizei width, GLsizei height,
 448                  struct pipe_texture *pt,
 449                  const GLfloat *color)
 450 {
 451    struct st_context *st = ctx->st;
 452    struct pipe_context *pipe = ctx->st->pipe;
 453    struct cso_context *cso = ctx->st->cso_context;
 454    struct st_fragment_program *stfp;
 455    GLuint maxSize;
 456    GLuint offset;
 457
 458    stfp = combined_bitmap_fragment_program(ctx);
 459
 460    /* As an optimization, Mesa's fragment programs will sometimes get the
 461     * primary color from a statevar/constant rather than a varying variable.
 462     * when that's the case, we need to ensure that we use the 'color'
 463     * parameter and not the current attribute color (which may have changed
 464     * through glRasterPos and state validation.
 465     * So, we force the proper color here.  Not elegant, but it works.
 466     */
 467    {
 468       GLfloat colorSave[4];
 469       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 470       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 471       st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 472       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 473    }
 474
 475
 476    /* limit checks */
 477    /* XXX if the bitmap is larger than the max texture size, break
 478     * it up into chunks.
 479     */
 480    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 481    assert(width <= (GLsizei)maxSize);
 482    assert(height <= (GLsizei)maxSize);
 483
 484    cso_save_rasterizer(cso);
 485    cso_save_samplers(cso);
 486    cso_save_sampler_textures(cso);
 487    cso_save_viewport(cso);
 488    cso_save_fragment_shader(cso);
 489    cso_save_vertex_shader(cso);
 490
 491    /* rasterizer state: just scissor */
 492    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 493    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 494
 495    /* fragment shader state: TEX lookup program */
 496    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 497
 498    /* vertex shader state: position + texcoord pass-through */
 499    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 500
 501    /* user samplers, plus our bitmap sampler */
 502    {
 503       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 504       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 505       uint i;
 506       for (i = 0; i < st->state.num_samplers; i++) {
 507          samplers[i] = &st->state.samplers[i];
 508       }
 509       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 510       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 511    }
 512
 513    /* user textures, plus the bitmap texture */
 514    {
 515       struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
 516       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 517       memcpy(textures, st->state.sampler_texture, sizeof(textures));
 518       textures[stfp->bitmap_sampler] = pt;
 519       cso_set_sampler_textures(cso, num, textures);
 520    }
 521
 522    /* viewport state: viewport matching window dims */
 523    {
 524       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 525       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 526       const GLfloat width = (GLfloat)fb->Width;
 527       const GLfloat height = (GLfloat)fb->Height;
 528       struct pipe_viewport_state vp;
 529       vp.scale[0] =  0.5f * width;
 530       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 531       vp.scale[2] = 1.0f;
 532       vp.scale[3] = 1.0f;
 533       vp.translate[0] = 0.5f * width;
 534       vp.translate[1] = 0.5f * height;
 535       vp.translate[2] = 0.0f;
 536       vp.translate[3] = 0.0f;
 537       cso_set_viewport(cso, &vp);
 538    }
 539
 540    /* draw textured quad */
 541    offset = setup_bitmap_vertex_data(st, x, y, width, height,
 542                                      ctx->Current.RasterPos[2],
 543                                      color);
 544
 545    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 546                            PIPE_PRIM_TRIANGLE_FAN,
 547                            4,  /* verts */
 548                            3); /* attribs/vert */
 549
 550
 551    /* restore state */
 552    cso_restore_rasterizer(cso);
 553    cso_restore_samplers(cso);
 554    cso_restore_sampler_textures(cso);
 555    cso_restore_viewport(cso);
 556    cso_restore_fragment_shader(cso);
 557    cso_restore_vertex_shader(cso);
 558 }
 559
 560
 561 static void
 562 reset_cache(struct st_context *st)
 563 {
 564    struct pipe_context *pipe = st->pipe;
 565    struct pipe_screen *screen = pipe->screen;
 566    struct bitmap_cache *cache = st->bitmap.cache;
 567
 568    //memset(cache->buffer, 0xff, sizeof(cache->buffer));
 569    cache->empty = GL_TRUE;
 570
 571    cache->xmin = 1000000;
 572    cache->xmax = -1000000;
 573    cache->ymin = 1000000;
 574    cache->ymax = -1000000;
 575
 576    if (cache->trans) {
 577       screen->tex_transfer_destroy(cache->trans);
 578       cache->trans = NULL;
 579    }
 580
 581    assert(!cache->texture);
 582
 583    /* allocate a new texture */
 584    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 585                                       st->bitmap.tex_format, 0,
 586                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 587                                       1, PIPE_TEXTURE_USAGE_SAMPLER);
 588
 589 }
 590
 591 static void
 592 create_cache_trans(struct st_context *st)
 593 {
 594    struct pipe_context *pipe = st->pipe;
 595    struct pipe_screen *screen = pipe->screen;
 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 = st_no_flush_get_tex_transfer(st, cache->texture, 0, 0, 0,
 605                                                PIPE_TRANSFER_WRITE, 0, 0,
 606                                                BITMAP_CACHE_WIDTH,
 607                                                BITMAP_CACHE_HEIGHT);
 608    cache->buffer = screen->transfer_map(screen, 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_screen *screen = pipe->screen;
 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             screen->transfer_unmap(screen, cache->trans);
 641             cache->buffer = NULL;
 642
 643             screen->tex_transfer_destroy(cache->trans);
 644             cache->trans = NULL;
 645          }
 646
 647          draw_bitmap_quad(st->ctx,
 648                           cache->xpos,
 649                           cache->ypos,
 650                           st->ctx->Current.RasterPos[2],
 651                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 652                           cache->texture,
 653                           cache->color);
 654       }
 655
 656       /* release/free the texture */
 657       pipe_texture_reference(&cache->texture, NULL);
 658
 659       reset_cache(st);
 660    }
 661 }
 662
 663 /* Flush bitmap cache and release vertex buffer.
 664  */
 665 void
 666 st_flush_bitmap( struct st_context *st )
 667 {
 668    st_flush_bitmap_cache(st);
 669
 670    /* Release vertex buffer to avoid synchronous rendering if we were
 671     * to map it in the next frame.
 672     */
 673    pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 674    st->bitmap.vbuf_slot = 0;
 675 }
 676
 677
 678 /**
 679  * Try to accumulate this glBitmap call in the bitmap cache.
 680  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 681  */
 682 static GLboolean
 683 accum_bitmap(struct st_context *st,
 684              GLint x, GLint y, GLsizei width, GLsizei height,
 685              const struct gl_pixelstore_attrib *unpack,
 686              const GLubyte *bitmap )
 687 {
 688    struct bitmap_cache *cache = st->bitmap.cache;
 689    int px = -999, py;
 690
 691    if (width > BITMAP_CACHE_WIDTH ||
 692        height > BITMAP_CACHE_HEIGHT)
 693       return GL_FALSE; /* too big to cache */
 694
 695    if (!cache->empty) {
 696       px = x - cache->xpos;  /* pos in buffer */
 697       py = y - cache->ypos;
 698       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 699           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 700           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color)) {
 701          /* This bitmap would extend beyond cache bounds, or the bitmap
 702           * color is changing
 703           * so flush and continue.
 704           */
 705          st_flush_bitmap_cache(st);
 706       }
 707    }
 708
 709    if (cache->empty) {
 710       /* Initialize.  Center bitmap vertically in the buffer. */
 711       px = 0;
 712       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 713       cache->xpos = x;
 714       cache->ypos = y - py;
 715       cache->empty = GL_FALSE;
 716       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 717    }
 718
 719    assert(px != -999);
 720
 721    if (x < cache->xmin)
 722       cache->xmin = x;
 723    if (y < cache->ymin)
 724       cache->ymin = y;
 725    if (x + width > cache->xmax)
 726       cache->xmax = x + width;
 727    if (y + height > cache->ymax)
 728       cache->ymax = y + height;
 729
 730    /* create the transfer if needed */
 731    create_cache_trans(st);
 732
 733    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 734                  cache->buffer, BITMAP_CACHE_WIDTH);
 735
 736    return GL_TRUE; /* accumulated */
 737 }
 738
 739
 740
 741 /**
 742  * Called via ctx->Driver.Bitmap()
 743  */
 744 static void
 745 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 746           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 747 {
 748    struct st_context *st = ctx->st;
 749    struct pipe_texture *pt;
 750
 751    if (width == 0 || height == 0)
 752       return;
 753
 754    st_validate_state(st);
 755
 756    if (!st->bitmap.vs) {
 757       /* create pass-through vertex shader now */
 758       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 759                                       TGSI_SEMANTIC_COLOR,
 760                                       TGSI_SEMANTIC_GENERIC };
 761       const uint semantic_indexes[] = { 0, 0, 0 };
 762       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 763                                                           semantic_names,
 764                                                           semantic_indexes);
 765    }
 766
 767    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 768       return;
 769
 770    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 771    if (pt) {
 772       assert(pt->target == PIPE_TEXTURE_2D);
 773       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 774                        width, height, pt,
 775                        st->ctx->Current.RasterColor);
 776       /* release/free the texture */
 777       pipe_texture_reference(&pt, NULL);
 778    }
 779 }
 780
 781
 782 /** Per-context init */
 783 void
 784 st_init_bitmap_functions(struct dd_function_table *functions)
 785 {
 786    functions->Bitmap = st_Bitmap;
 787 }
 788
 789
 790 /** Per-context init */
 791 void
 792 st_init_bitmap(struct st_context *st)
 793 {
 794    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 795    struct pipe_context *pipe = st->pipe;
 796    struct pipe_screen *screen = pipe->screen;
 797
 798    /* init sampler state once */
 799    memset(sampler, 0, sizeof(*sampler));
 800    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 801    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 802    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 803    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 804    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 805    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 806    sampler->normalized_coords = 1;
 807
 808    /* init baseline rasterizer state once */
 809    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 810    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 811
 812    /* find a usable texture format */
 813    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D,
 814                                    PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 815       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 816    }
 817    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM, PIPE_TEXTURE_2D,
 818                                         PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 819       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 820    }
 821    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, PIPE_TEXTURE_2D,
 822                                         PIPE_TEXTURE_USAGE_SAMPLER, 0)) {
 823       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 824    }
 825    else {
 826       /* XXX support more formats */
 827       assert(0);
 828    }
 829
 830    /* alloc bitmap cache object */
 831    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 832
 833    reset_cache(st);
 834 }
 835
 836
 837 /** Per-context tear-down */
 838 void
 839 st_destroy_bitmap(struct st_context *st)
 840 {
 841    struct pipe_context *pipe = st->pipe;
 842    struct pipe_screen *screen = pipe->screen;
 843    struct bitmap_cache *cache = st->bitmap.cache;
 844
 845
 846
 847    if (st->bitmap.vs) {
 848       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 849       st->bitmap.vs = NULL;
 850    }
 851
 852    if (st->bitmap.vbuf) {
 853       pipe_buffer_reference(&st->bitmap.vbuf, NULL);
 854       st->bitmap.vbuf = NULL;
 855    }
 856
 857    if (cache) {
 858       if (cache->trans) {
 859          screen->transfer_unmap(screen, cache->trans);
 860          screen->tex_transfer_destroy(cache->trans);
 861       }
 862       pipe_texture_reference(&st->bitmap.cache->texture, NULL);
 863       _mesa_free(st->bitmap.cache);
 864       st->bitmap.cache = NULL;
 865    }
 866 }