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 "pipe/p_context.h"
  51 #include "pipe/p_defines.h"
  52 #include "pipe/p_inlines.h"
  53 #include "pipe/p_winsys.h"
  54 #include "util/p_tile.h"
  55 #include "util/u_draw_quad.h"
  56 #include "util/u_simple_shaders.h"
  57 #include "shader/prog_instruction.h"
  58 #include "cso_cache/cso_context.h"
  59
  60
  61
  62 /**
  63  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  64  * buffer which is then rendered en mass upon a flush, state change, etc.
  65  * A wide, short buffer is used to target the common case of a series
  66  * of glBitmap calls being used to draw text.
  67  */
  68 static GLboolean UseBitmapCache = GL_TRUE;
  69
  70
  71 #define BITMAP_CACHE_WIDTH  512
  72 #define BITMAP_CACHE_HEIGHT 32
  73
  74 struct bitmap_cache
  75 {
  76    /** Window pos to render the cached image */
  77    GLint xpos, ypos;
  78    /** Bounds of region used in window coords */
  79    GLint xmin, ymin, xmax, ymax;
  80    struct pipe_texture *texture;
  81    GLboolean empty;
  82    /** An I8 texture image: */
  83    GLubyte buffer[BITMAP_CACHE_HEIGHT][BITMAP_CACHE_WIDTH];
  84 };
  85
  86
  87
  88
  89 /**
  90  * Make fragment program for glBitmap:
  91  *   Sample the texture and kill the fragment if the bit is 0.
  92  * This program will be combined with the user's fragment program.
  93  */
  94 static struct st_fragment_program *
  95 make_bitmap_fragment_program(GLcontext *ctx)
  96 {
  97    struct st_fragment_program *stfp;
  98    struct gl_program *p;
  99    GLuint ic = 0;
 100
 101    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 102    if (!p)
 103       return NULL;
 104
 105    p->NumInstructions = 5;
 106
 107    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 108    if (!p->Instructions) {
 109       ctx->Driver.DeleteProgram(ctx, p);
 110       return NULL;
 111    }
 112    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 113
 114    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 115    p->Instructions[ic].Opcode = OPCODE_TEX;
 116    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 117    p->Instructions[ic].DstReg.Index = 0;
 118    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 119    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 120    p->Instructions[ic].TexSrcUnit = 0;
 121    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 122    ic++;
 123
 124    /* SWZ tmp0.x, tmp0.x, 1111; # tmp0.x = 1.0 */
 125    p->Instructions[ic].Opcode = OPCODE_SWZ;
 126    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 127    p->Instructions[ic].DstReg.Index = 0;
 128    p->Instructions[ic].DstReg.WriteMask = WRITEMASK_X;
 129    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 130    p->Instructions[ic].SrcReg[0].Index = 0;
 131    p->Instructions[ic].SrcReg[0].Swizzle
 132       = MAKE_SWIZZLE4(SWIZZLE_ONE, SWIZZLE_ONE, SWIZZLE_ONE, SWIZZLE_ONE );
 133    ic++;
 134
 135    /* SUB tmp0, tmp0.wwww, tmp0.xxxx;  #  tmp0.w -= 1 */
 136    p->Instructions[ic].Opcode = OPCODE_SUB;
 137    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 138    p->Instructions[ic].DstReg.Index = 0;
 139    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 140    p->Instructions[ic].SrcReg[0].Index = 0;
 141    p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_WWWW;
 142    p->Instructions[ic].SrcReg[1].File = PROGRAM_TEMPORARY;
 143    p->Instructions[ic].SrcReg[1].Index = 0;
 144    p->Instructions[ic].SrcReg[1].Swizzle = SWIZZLE_XXXX; /* 1.0 */
 145    ic++;
 146
 147    /* KIL if tmp0 < 0 */
 148    p->Instructions[ic].Opcode = OPCODE_KIL;
 149    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 150    p->Instructions[ic].SrcReg[0].Index = 0;
 151    ic++;
 152
 153    /* END; */
 154    p->Instructions[ic++].Opcode = OPCODE_END;
 155
 156    assert(ic == p->NumInstructions);
 157
 158    p->InputsRead = FRAG_BIT_TEX0;
 159    p->OutputsWritten = 0x0;
 160
 161    stfp = (struct st_fragment_program *) p;
 162    stfp->Base.UsesKill = GL_TRUE;
 163    st_translate_fragment_program(ctx->st, stfp, NULL);
 164
 165    return stfp;
 166 }
 167
 168
 169 /**
 170  * Combine basic bitmap fragment program with the user-defined program.
 171  */
 172 static struct st_fragment_program *
 173 combined_bitmap_fragment_program(GLcontext *ctx)
 174 {
 175    struct st_context *st = ctx->st;
 176    struct st_fragment_program *stfp;
 177
 178    if (!st->bitmap.program) {
 179       /* create the basic bitmap fragment program */
 180       st->bitmap.program = make_bitmap_fragment_program(ctx);
 181    }
 182
 183    if (st->bitmap.user_prog_sn == st->fp->serialNo) {
 184       /* re-use */
 185       stfp = st->bitmap.combined_prog;
 186    }
 187    else {
 188       /* Concatenate the bitmap program with the current user-defined program.
 189        */
 190       stfp = (struct st_fragment_program *)
 191          _mesa_combine_programs(ctx,
 192                                 &st->bitmap.program->Base.Base,
 193                                 &st->fp->Base.Base);
 194
 195 #if 0
 196       {
 197          struct gl_program *p = &stfp->Base.Base;
 198          printf("Combined bitmap program:\n");
 199          _mesa_print_program(p);
 200          printf("InputsRead: 0x%x\n", p->InputsRead);
 201          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 202          _mesa_print_parameter_list(p->Parameters);
 203       }
 204 #endif
 205
 206       /* translate to TGSI tokens */
 207       st_translate_fragment_program(st, stfp, NULL);
 208
 209       /* save new program, update serial numbers */
 210       st->bitmap.user_prog_sn = st->fp->serialNo;
 211       st->bitmap.combined_prog = stfp;
 212    }
 213
 214    /* Ideally we'd have updated the pipe constants during the normal
 215     * st/atom mechanism.  But we can't since this is specific to glBitmap.
 216     */
 217    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 218
 219    return stfp;
 220 }
 221
 222
 223 /**
 224  * Create a texture which represents a bitmap image.
 225  */
 226 static struct pipe_texture *
 227 make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height,
 228                     const struct gl_pixelstore_attrib *unpack,
 229                     const GLubyte *bitmap)
 230 {
 231    struct pipe_context *pipe = ctx->st->pipe;
 232    struct pipe_screen *screen = pipe->screen;
 233    struct pipe_surface *surface;
 234    uint format = 0, cpp, comp;
 235    ubyte *dest;
 236    struct pipe_texture *pt;
 237    int row, col;
 238
 239    /* find a texture format we know */
 240    if (screen->is_format_supported( screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE )) {
 241       format = PIPE_FORMAT_U_I8;
 242       cpp = 1;
 243       comp = 0;
 244    }
 245    else if (screen->is_format_supported( screen, PIPE_FORMAT_A8R8G8B8_UNORM, PIPE_TEXTURE )) {
 246       format = PIPE_FORMAT_A8R8G8B8_UNORM;
 247       cpp = 4;
 248       comp = 3; /* alpha channel */ /*XXX little-endian dependency */
 249    }
 250    else {
 251       /* XXX support more formats */
 252       assert( 0 );
 253    }
 254
 255    /* PBO source... */
 256    bitmap = _mesa_map_bitmap_pbo(ctx, unpack, bitmap);
 257    if (!bitmap) {
 258       return NULL;
 259    }
 260
 261    /**
 262     * Create texture to hold bitmap pattern.
 263     */
 264    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, format, 0, width, height,
 265                           1, 0);
 266    if (!pt) {
 267       _mesa_unmap_bitmap_pbo(ctx, unpack);
 268       return NULL;
 269    }
 270
 271    surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 272
 273    /* map texture surface */
 274    dest = pipe_surface_map(surface);
 275
 276    /* Put image into texture surface.
 277     * Note that the image is actually going to be upside down in
 278     * the texture.  We deal with that with texcoords.
 279     */
 280
 281    for (row = 0; row < height; row++) {
 282       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 283                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 284       ubyte *destRow = dest + row * surface->pitch * cpp;
 285
 286       if (unpack->LsbFirst) {
 287          /* Lsb first */
 288          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 289          for (col = 0; col < width; col++) {
 290
 291             /* set texel to 255 if bit is set */
 292             destRow[comp] = (*src & mask) ? 255 : 0;
 293             destRow += cpp;
 294
 295             if (mask == 128U) {
 296                src++;
 297                mask = 1U;
 298             }
 299             else {
 300                mask = mask << 1;
 301             }
 302          }
 303
 304          /* get ready for next row */
 305          if (mask != 1)
 306             src++;
 307       }
 308       else {
 309          /* Msb first */
 310          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 311          for (col = 0; col < width; col++) {
 312
 313             /* set texel to 255 if bit is set */
 314             destRow[comp] =(*src & mask) ? 255 : 0;
 315             destRow += cpp;
 316
 317             if (mask == 1U) {
 318                src++;
 319                mask = 128U;
 320             }
 321             else {
 322                mask = mask >> 1;
 323             }
 324          }
 325
 326          /* get ready for next row */
 327          if (mask != 128)
 328             src++;
 329       }
 330
 331    } /* row */
 332
 333    _mesa_unmap_bitmap_pbo(ctx, unpack);
 334
 335    /* Release surface */
 336    pipe_surface_unmap(surface);
 337    pipe_surface_reference(&surface, NULL);
 338    pipe->texture_update(pipe, pt, 0, 0x1);
 339
 340    pt->format = format;
 341
 342    return pt;
 343 }
 344
 345
 346 static void
 347 setup_bitmap_vertex_data(struct st_context *st,
 348                          int x, int y, int width, int height,
 349                          float z, const float color[4])
 350 {
 351    struct pipe_context *pipe = st->pipe;
 352    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 353    const GLfloat fb_width = fb->Width;
 354    const GLfloat fb_height = fb->Height;
 355    const GLfloat x0 = x;
 356    const GLfloat x1 = x + width;
 357    const GLfloat y0 = y;
 358    const GLfloat y1 = y + height;
 359    const GLfloat bias = st->bitmap_texcoord_bias;
 360    const GLfloat xBias = bias / (x1-x0);
 361    const GLfloat yBias = bias / (y1-y0);
 362    const GLfloat sLeft = 0.0 + xBias, sRight = 1.0 + xBias;
 363    const GLfloat tTop = yBias, tBot = 1.0 - tTop - yBias;
 364    const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 365    const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 366    const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 367    const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 368    GLuint i;
 369    void *buf;
 370
 371    if (!st->bitmap.vbuf) {
 372       st->bitmap.vbuf = pipe->winsys->buffer_create(pipe->winsys, 32,
 373                                                    PIPE_BUFFER_USAGE_VERTEX,
 374                                                    sizeof(st->bitmap.vertices));
 375    }
 376
 377    /* Positions are in clip coords since we need to do clipping in case
 378     * the bitmap quad goes beyond the window bounds.
 379     */
 380    st->bitmap.vertices[0][0][0] = clip_x0;
 381    st->bitmap.vertices[0][0][1] = clip_y0;
 382    st->bitmap.vertices[0][2][0] = sLeft;
 383    st->bitmap.vertices[0][2][1] = tTop;
 384
 385    st->bitmap.vertices[1][0][0] = clip_x1;
 386    st->bitmap.vertices[1][0][1] = clip_y0;
 387    st->bitmap.vertices[1][2][0] = sRight;
 388    st->bitmap.vertices[1][2][1] = tTop;
 389
 390    st->bitmap.vertices[2][0][0] = clip_x1;
 391    st->bitmap.vertices[2][0][1] = clip_y1;
 392    st->bitmap.vertices[2][2][0] = sRight;
 393    st->bitmap.vertices[2][2][1] = tBot;
 394
 395    st->bitmap.vertices[3][0][0] = clip_x0;
 396    st->bitmap.vertices[3][0][1] = clip_y1;
 397    st->bitmap.vertices[3][2][0] = sLeft;
 398    st->bitmap.vertices[3][2][1] = tBot;
 399
 400    /* same for all verts: */
 401    for (i = 0; i < 4; i++) {
 402       st->bitmap.vertices[i][0][2] = z;
 403       st->bitmap.vertices[i][0][3] = 1.0;
 404       st->bitmap.vertices[i][1][0] = color[0];
 405       st->bitmap.vertices[i][1][1] = color[1];
 406       st->bitmap.vertices[i][1][2] = color[2];
 407       st->bitmap.vertices[i][1][3] = color[3];
 408       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 409       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 410    }
 411
 412    /* put vertex data into vbuf */
 413    buf = pipe->winsys->buffer_map(pipe->winsys, st->bitmap.vbuf,
 414                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 415    memcpy(buf, st->bitmap.vertices, sizeof(st->bitmap.vertices));
 416    pipe->winsys->buffer_unmap(pipe->winsys, st->bitmap.vbuf);
 417 }
 418
 419
 420
 421 /**
 422  * Render a glBitmap by drawing a textured quad
 423  */
 424 static void
 425 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 426                  GLsizei width, GLsizei height,
 427                  struct pipe_texture *pt)
 428 {
 429    struct st_context *st = ctx->st;
 430    struct pipe_context *pipe = ctx->st->pipe;
 431    struct cso_context *cso = ctx->st->cso_context;
 432    struct st_fragment_program *stfp;
 433    GLuint maxSize;
 434
 435    stfp = combined_bitmap_fragment_program(ctx);
 436
 437    /* limit checks */
 438    /* XXX if the bitmap is larger than the max texture size, break
 439     * it up into chunks.
 440     */
 441    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 442    assert(width <= maxSize);
 443    assert(height <= maxSize);
 444
 445    cso_save_rasterizer(cso);
 446    cso_save_samplers(cso);
 447    cso_save_sampler_textures(cso);
 448    cso_save_viewport(cso);
 449
 450    /* rasterizer state: just scissor */
 451    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 452    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 453
 454    /* fragment shader state: TEX lookup program */
 455    pipe->bind_fs_state(pipe, stfp->driver_shader);
 456
 457    /* vertex shader state: position + texcoord pass-through */
 458    pipe->bind_vs_state(pipe, st->bitmap.vs);
 459
 460    /* sampler / texture state */
 461    cso_single_sampler(cso, 0, &st->bitmap.sampler);
 462    cso_single_sampler_done(cso);
 463    pipe->set_sampler_textures(pipe, 1, &pt);
 464
 465    /* viewport state: viewport matching window dims */
 466    {
 467       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 468       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 469       const float width = fb->Width;
 470       const float height = fb->Height;
 471       struct pipe_viewport_state vp;
 472       vp.scale[0] =  0.5 * width;
 473       vp.scale[1] = height * (invert ? -0.5 : 0.5);
 474       vp.scale[2] = 1.0;
 475       vp.scale[3] = 1.0;
 476       vp.translate[0] = 0.5 * width;
 477       vp.translate[1] = 0.5 * height;
 478       vp.translate[2] = 0.0;
 479       vp.translate[3] = 0.0;
 480       cso_set_viewport(cso, &vp);
 481    }
 482
 483    /* draw textured quad */
 484    setup_bitmap_vertex_data(st, x, y, width, height,
 485                             ctx->Current.RasterPos[2],
 486                             ctx->Current.RasterColor);
 487
 488    util_draw_vertex_buffer(pipe, st->bitmap.vbuf,
 489                            PIPE_PRIM_TRIANGLE_FAN,
 490                            4,  /* verts */
 491                            3); /* attribs/vert */
 492
 493
 494    /* restore state */
 495    cso_restore_rasterizer(cso);
 496    cso_restore_samplers(cso);
 497    cso_restore_sampler_textures(cso);
 498    cso_restore_viewport(cso);
 499    /* shaders don't go through cso yet */
 500    pipe->bind_fs_state(pipe, st->fp->driver_shader);
 501    pipe->bind_vs_state(pipe, st->vp->driver_shader);
 502 }
 503
 504
 505 static void
 506 reset_cache(struct st_context *st)
 507 {
 508    memset(st->bitmap.cache->buffer, 0, sizeof(st->bitmap.cache->buffer));
 509    st->bitmap.cache->empty = GL_TRUE;
 510
 511    st->bitmap.cache->xmin = 1000000;
 512    st->bitmap.cache->xmax = -1000000;
 513    st->bitmap.cache->ymin = 1000000;
 514    st->bitmap.cache->ymax = -1000000;
 515 }
 516
 517
 518 static void
 519 init_bitmap_cache(struct st_context *st)
 520 {
 521    struct pipe_context *pipe = st->pipe;
 522    struct pipe_screen *screen = pipe->screen;
 523    enum pipe_format format;
 524
 525    st->bitmap.cache = CALLOC_STRUCT(bitmap_cache);
 526    if (!st->bitmap.cache)
 527       return;
 528
 529    /* find a usable texture format */
 530    if (screen->is_format_supported(screen, PIPE_FORMAT_U_I8, PIPE_TEXTURE)) {
 531       format = PIPE_FORMAT_U_I8;
 532    }
 533    else {
 534       /* XXX support more formats */
 535       assert(0);
 536    }
 537
 538    st->bitmap.cache->texture
 539       = st_texture_create(st, PIPE_TEXTURE_2D, format, 0,
 540                           BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 1, 0);
 541    if (!st->bitmap.cache->texture) {
 542       FREE(st->bitmap.cache);
 543       st->bitmap.cache = NULL;
 544       return;
 545    }
 546
 547    reset_cache(st);
 548 }
 549
 550
 551 /**
 552  * If there's anything in the bitmap cache, draw/flush it now.
 553  */
 554 void
 555 st_flush_bitmap_cache(struct st_context *st)
 556 {
 557    if (!st->bitmap.cache->empty) {
 558       struct bitmap_cache *cache = st->bitmap.cache;
 559       struct pipe_context *pipe = st->pipe;
 560       struct pipe_screen *screen = pipe->screen;
 561       struct pipe_surface *surf;
 562       void *dest;
 563
 564       assert(cache->xmin <= cache->xmax);
 565       /*
 566       printf("flush size %d x %d  at %d, %d\n",
 567              cache->xmax - cache->xmin,
 568              cache->ymax - cache->ymin,
 569              cache->xpos, cache->ypos);
 570       */
 571
 572       /* update the texture map image */
 573       surf = screen->get_tex_surface(screen, cache->texture, 0, 0, 0);
 574       dest = pipe_surface_map(surf);
 575       memcpy(dest, cache->buffer, sizeof(cache->buffer));
 576       pipe_surface_unmap(surf);
 577       pipe_surface_reference(&surf, NULL);
 578
 579       pipe->texture_update(pipe, cache->texture, 0, 0x1);
 580
 581       draw_bitmap_quad(st->ctx,
 582                        cache->xpos,
 583                        cache->ypos,
 584                        st->ctx->Current.RasterPos[2],
 585                        BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 586                        cache->texture);
 587
 588       reset_cache(st);
 589    }
 590 }
 591
 592
 593 /**
 594  * Try to accumulate this glBitmap call in the bitmap cache.
 595  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 596  */
 597 static GLboolean
 598 accum_bitmap(struct st_context *st,
 599              GLint x, GLint y, GLsizei width, GLsizei height,
 600              const struct gl_pixelstore_attrib *unpack,
 601              const GLubyte *bitmap )
 602 {
 603    struct bitmap_cache *cache = st->bitmap.cache;
 604    int row, col;
 605    int px = -999, py;
 606
 607    if (width > BITMAP_CACHE_WIDTH ||
 608        height > BITMAP_CACHE_HEIGHT)
 609       return GL_FALSE; /* too big to cache */
 610
 611    if (!cache->empty) {
 612       px = x - cache->xpos;  /* pos in buffer */
 613       py = y - cache->ypos;
 614       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 615           py < 0 || py + height > BITMAP_CACHE_HEIGHT) {
 616          /* This bitmap would extend beyond cache bounds,
 617           * so flush and continue.
 618           */
 619          st_flush_bitmap_cache(st);
 620       }
 621    }
 622
 623    if (cache->empty) {
 624       /* Initialize.  Center bitmap vertically in the buffer. */
 625       px = 0;
 626       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 627       cache->xpos = x;
 628       cache->ypos = y - py;
 629       cache->empty = GL_FALSE;
 630    }
 631
 632    assert(px != -999);
 633
 634    if (x < cache->xmin)
 635       cache->xmin = x;
 636    if (y < cache->ymin)
 637       cache->ymin = y;
 638    if (x + width > cache->xmax)
 639       cache->xmax = x + width;
 640    if (y + height > cache->ymax)
 641       cache->ymax = y + height;
 642
 643    /* XXX try to combine this code with code in make_bitmap_texture() */
 644 #define SET_PIXEL(COL, ROW) \
 645    cache->buffer[py + (ROW)][px + (COL)] = 0xff;
 646
 647    for (row = 0; row < height; row++) {
 648       const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
 649                  bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
 650
 651       if (unpack->LsbFirst) {
 652          /* Lsb first */
 653          GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
 654          for (col = 0; col < width; col++) {
 655
 656             if (*src & mask) {
 657                SET_PIXEL(col, row);
 658             }
 659
 660             if (mask == 128U) {
 661                src++;
 662                mask = 1U;
 663             }
 664             else {
 665                mask = mask << 1;
 666             }
 667          }
 668
 669          /* get ready for next row */
 670          if (mask != 1)
 671             src++;
 672       }
 673       else {
 674          /* Msb first */
 675          GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
 676          for (col = 0; col < width; col++) {
 677
 678             if (*src & mask) {
 679                SET_PIXEL(col, row);
 680             }
 681
 682             if (mask == 1U) {
 683                src++;
 684                mask = 128U;
 685             }
 686             else {
 687                mask = mask >> 1;
 688             }
 689          }
 690
 691          /* get ready for next row */
 692          if (mask != 128)
 693             src++;
 694       }
 695
 696    } /* row */
 697
 698    return GL_TRUE; /* accumulated */
 699 }
 700
 701
 702
 703 /**
 704  * Called via ctx->Driver.Bitmap()
 705  */
 706 static void
 707 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 708           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 709 {
 710    struct st_context *st = ctx->st;
 711    struct pipe_texture *pt;
 712
 713    st_validate_state(st);
 714
 715    if (!st->bitmap.vs) {
 716       /* create pass-through vertex shader now */
 717       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 718                                       TGSI_SEMANTIC_COLOR,
 719                                       TGSI_SEMANTIC_GENERIC };
 720       const uint semantic_indexes[] = { 0, 0, 0 };
 721       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 722                                                           semantic_names,
 723                                                           semantic_indexes,
 724                                                           &st->bitmap.vert_shader);
 725    }
 726
 727    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 728       return;
 729
 730    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 731    if (pt) {
 732       assert(pt->target == PIPE_TEXTURE_2D);
 733       draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 734                        width, height, pt);
 735       pipe_texture_reference(&pt, NULL);
 736    }
 737 }
 738
 739
 740 /** Per-context init */
 741 void
 742 st_init_bitmap_functions(struct dd_function_table *functions)
 743 {
 744    functions->Bitmap = st_Bitmap;
 745 }
 746
 747
 748 /** Per-context init */
 749 void
 750 st_init_bitmap(struct st_context *st)
 751 {
 752    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 753
 754    /* init sampler state once */
 755    memset(sampler, 0, sizeof(*sampler));
 756    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 757    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 758    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 759    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 760    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 761    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 762    sampler->normalized_coords = 1;
 763
 764    /* init baseline rasterizer state once */
 765    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 766    st->bitmap.rasterizer.bypass_vs = 1;
 767
 768    init_bitmap_cache(st);
 769 }
 770
 771
 772 /** Per-context tear-down */
 773 void
 774 st_destroy_bitmap(struct st_context *st)
 775 {
 776    struct pipe_context *pipe = st->pipe;
 777
 778    if (st->bitmap.combined_prog) {
 779       st_delete_program(st->ctx, &st->bitmap.combined_prog->Base.Base);
 780    }
 781
 782    if (st->bitmap.program) {
 783       st_delete_program(st->ctx, &st->bitmap.program->Base.Base);
 784    }
 785
 786    if (st->bitmap.vs) {
 787       pipe->delete_vs_state(pipe, st->bitmap.vs);
 788       st->bitmap.vs = NULL;
 789    }
 790
 791    if (st->bitmap.vbuf) {
 792       pipe->winsys->buffer_destroy(pipe->winsys, st->bitmap.vbuf);
 793       st->bitmap.vbuf = NULL;
 794    }
 795
 796    if (st->bitmap.cache) {
 797       pipe_texture_release(&st->bitmap.cache->texture);
 798       FREE(st->bitmap.cache);
 799       st->bitmap.cache = NULL;
 800    }
 801 }