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(GLcontext *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  */
 189 static struct st_fragment_program *
 190 combined_bitmap_fragment_program(GLcontext *ctx)
 191 {
 192    struct st_context *st = st_context(ctx);
 193    struct st_fragment_program *stfp = st->fp;
 194
 195    if (!stfp->bitmap_program) {
 196       /*
 197        * Generate new program which is the user-defined program prefixed
 198        * with the bitmap sampler/kill instructions.
 199        */
 200       struct st_fragment_program *bitmap_prog;
 201       uint sampler;
 202
 203       sampler = find_free_bit(st->fp->Base.Base.SamplersUsed);
 204       bitmap_prog = make_bitmap_fragment_program(ctx, sampler);
 205
 206       stfp->bitmap_program = (struct st_fragment_program *)
 207          _mesa_combine_programs(ctx,
 208                                 &bitmap_prog->Base.Base, &stfp->Base.Base);
 209       stfp->bitmap_program->bitmap_sampler = sampler;
 210
 211       /* done with this after combining */
 212       st_reference_fragprog(st, &bitmap_prog, NULL);
 213
 214 #if 0
 215       {
 216          struct gl_program *p = &stfp->bitmap_program->Base.Base;
 217          printf("Combined bitmap program:\n");
 218          _mesa_print_program(p);
 219          printf("InputsRead: 0x%x\n", p->InputsRead);
 220          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 221          _mesa_print_parameter_list(p->Parameters);
 222       }
 223 #endif
 224
 225       /* translate to TGSI tokens */
 226       st_translate_fragment_program(st, stfp->bitmap_program);
 227    }
 228
 229    return stfp->bitmap_program;
 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(GLcontext *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, PIPE_TEXTURE_2D, st->bitmap.tex_format,
 279                           0, width, height, 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, 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,
 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    const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 320    const 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
 326    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 327     * no_flush) updates to buffers where we know there is no conflict
 328     * with previous data.  Currently using max_slots > 1 will cause
 329     * synchronous rendering if the driver flushes its command buffers
 330     * between one bitmap and the next.  Our flush hook below isn't
 331     * sufficient to catch this as the driver doesn't tell us when it
 332     * flushes its own command buffers.  Until this gets fixed, pay the
 333     * price of allocating a new buffer for each bitmap cache-flush to
 334     * avoid synchronous rendering.
 335     */
 336    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 337    GLuint i;
 338
 339    if (st->bitmap.vbuf_slot >= max_slots) {
 340       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 341       st->bitmap.vbuf_slot = 0;
 342    }
 343
 344    if (!st->bitmap.vbuf) {
 345       st->bitmap.vbuf = pipe_buffer_create(pipe->screen,
 346                                            PIPE_BIND_VERTEX_BUFFER,
 347                                            max_slots * sizeof(st->bitmap.vertices));
 348    }
 349
 350    /* Positions are in clip coords since we need to do clipping in case
 351     * the bitmap quad goes beyond the window bounds.
 352     */
 353    st->bitmap.vertices[0][0][0] = clip_x0;
 354    st->bitmap.vertices[0][0][1] = clip_y0;
 355    st->bitmap.vertices[0][2][0] = sLeft;
 356    st->bitmap.vertices[0][2][1] = tTop;
 357
 358    st->bitmap.vertices[1][0][0] = clip_x1;
 359    st->bitmap.vertices[1][0][1] = clip_y0;
 360    st->bitmap.vertices[1][2][0] = sRight;
 361    st->bitmap.vertices[1][2][1] = tTop;
 362
 363    st->bitmap.vertices[2][0][0] = clip_x1;
 364    st->bitmap.vertices[2][0][1] = clip_y1;
 365    st->bitmap.vertices[2][2][0] = sRight;
 366    st->bitmap.vertices[2][2][1] = tBot;
 367
 368    st->bitmap.vertices[3][0][0] = clip_x0;
 369    st->bitmap.vertices[3][0][1] = clip_y1;
 370    st->bitmap.vertices[3][2][0] = sLeft;
 371    st->bitmap.vertices[3][2][1] = tBot;
 372
 373    /* same for all verts: */
 374    for (i = 0; i < 4; i++) {
 375       st->bitmap.vertices[i][0][2] = z;
 376       st->bitmap.vertices[i][0][3] = 1.0;
 377       st->bitmap.vertices[i][1][0] = color[0];
 378       st->bitmap.vertices[i][1][1] = color[1];
 379       st->bitmap.vertices[i][1][2] = color[2];
 380       st->bitmap.vertices[i][1][3] = color[3];
 381       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 382       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 383    }
 384
 385    /* put vertex data into vbuf */
 386    pipe_buffer_write_nooverlap(st->pipe,
 387                                            st->bitmap.vbuf,
 388                                            st->bitmap.vbuf_slot * sizeof st->bitmap.vertices,
 389                                            sizeof st->bitmap.vertices,
 390                                            st->bitmap.vertices);
 391
 392    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 393 }
 394
 395
 396
 397 /**
 398  * Render a glBitmap by drawing a textured quad
 399  */
 400 static void
 401 draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 402                  GLsizei width, GLsizei height,
 403                  struct pipe_sampler_view *sv,
 404                  const GLfloat *color)
 405 {
 406    struct st_context *st = st_context(ctx);
 407    struct pipe_context *pipe = st->pipe;
 408    struct cso_context *cso = st->cso_context;
 409    struct st_fragment_program *stfp;
 410    GLuint maxSize;
 411    GLuint offset;
 412
 413    stfp = combined_bitmap_fragment_program(ctx);
 414
 415    /* As an optimization, Mesa's fragment programs will sometimes get the
 416     * primary color from a statevar/constant rather than a varying variable.
 417     * when that's the case, we need to ensure that we use the 'color'
 418     * parameter and not the current attribute color (which may have changed
 419     * through glRasterPos and state validation.
 420     * So, we force the proper color here.  Not elegant, but it works.
 421     */
 422    {
 423       GLfloat colorSave[4];
 424       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 425       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 426       st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 427       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 428    }
 429
 430
 431    /* limit checks */
 432    /* XXX if the bitmap is larger than the max texture size, break
 433     * it up into chunks.
 434     */
 435    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 436    assert(width <= (GLsizei)maxSize);
 437    assert(height <= (GLsizei)maxSize);
 438
 439    cso_save_rasterizer(cso);
 440    cso_save_samplers(cso);
 441    cso_save_fragment_sampler_views(cso);
 442    cso_save_viewport(cso);
 443    cso_save_fragment_shader(cso);
 444    cso_save_vertex_shader(cso);
 445    cso_save_vertex_elements(cso);
 446
 447    /* rasterizer state: just scissor */
 448    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 449    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 450
 451    /* fragment shader state: TEX lookup program */
 452    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 453
 454    /* vertex shader state: position + texcoord pass-through */
 455    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 456
 457    /* user samplers, plus our bitmap sampler */
 458    {
 459       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 460       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers);
 461       uint i;
 462       for (i = 0; i < st->state.num_samplers; i++) {
 463          samplers[i] = &st->state.samplers[i];
 464       }
 465       samplers[stfp->bitmap_sampler] = &st->bitmap.sampler;
 466       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 467    }
 468
 469    /* user textures, plus the bitmap texture */
 470    {
 471       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 472       uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures);
 473       memcpy(sampler_views, st->state.sampler_views, sizeof(sampler_views));
 474       sampler_views[stfp->bitmap_sampler] = sv;
 475       cso_set_fragment_sampler_views(cso, num, sampler_views);
 476    }
 477
 478    /* viewport state: viewport matching window dims */
 479    {
 480       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 481       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 482       const GLfloat width = (GLfloat)fb->Width;
 483       const GLfloat height = (GLfloat)fb->Height;
 484       struct pipe_viewport_state vp;
 485       vp.scale[0] =  0.5f * width;
 486       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 487       vp.scale[2] = 0.5f;
 488       vp.scale[3] = 1.0f;
 489       vp.translate[0] = 0.5f * width;
 490       vp.translate[1] = 0.5f * height;
 491       vp.translate[2] = 0.5f;
 492       vp.translate[3] = 0.0f;
 493       cso_set_viewport(cso, &vp);
 494    }
 495
 496    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 497
 498    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 499    z = z * 2.0 - 1.0;
 500
 501    /* draw textured quad */
 502    offset = setup_bitmap_vertex_data(st, x, y, width, height, z, color);
 503
 504    util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset,
 505                            PIPE_PRIM_TRIANGLE_FAN,
 506                            4,  /* verts */
 507                            3); /* attribs/vert */
 508
 509
 510    /* restore state */
 511    cso_restore_rasterizer(cso);
 512    cso_restore_samplers(cso);
 513    cso_restore_fragment_sampler_views(cso);
 514    cso_restore_viewport(cso);
 515    cso_restore_fragment_shader(cso);
 516    cso_restore_vertex_shader(cso);
 517    cso_restore_vertex_elements(cso);
 518 }
 519
 520
 521 static void
 522 reset_cache(struct st_context *st)
 523 {
 524    struct pipe_context *pipe = st->pipe;
 525    struct bitmap_cache *cache = st->bitmap.cache;
 526
 527    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 528    cache->empty = GL_TRUE;
 529
 530    cache->xmin = 1000000;
 531    cache->xmax = -1000000;
 532    cache->ymin = 1000000;
 533    cache->ymax = -1000000;
 534
 535    if (cache->trans) {
 536       pipe->transfer_destroy(pipe, cache->trans);
 537       cache->trans = NULL;
 538    }
 539
 540    assert(!cache->texture);
 541
 542    /* allocate a new texture */
 543    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 544                                       st->bitmap.tex_format, 0,
 545                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 546                                       1,
 547                                       PIPE_BIND_SAMPLER_VIEW);
 548 }
 549
 550
 551 /** Print bitmap image to stdout (debug) */
 552 static void
 553 print_cache(const struct bitmap_cache *cache)
 554 {
 555    int i, j, k;
 556
 557    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 558       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 559       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 560          if (cache->buffer[k])
 561             printf("X");
 562          else
 563             printf(" ");
 564          k++;
 565       }
 566       printf("\n");
 567    }
 568 }
 569
 570
 571 static void
 572 create_cache_trans(struct st_context *st)
 573 {
 574    struct pipe_context *pipe = st->pipe;
 575    struct bitmap_cache *cache = st->bitmap.cache;
 576
 577    if (cache->trans)
 578       return;
 579
 580    /* Map the texture transfer.
 581     * Subsequent glBitmap calls will write into the texture image.
 582     */
 583    cache->trans = pipe_get_transfer(st->pipe, cache->texture, 0, 0, 0,
 584                                                PIPE_TRANSFER_WRITE, 0, 0,
 585                                                BITMAP_CACHE_WIDTH,
 586                                                BITMAP_CACHE_HEIGHT);
 587    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 588
 589    /* init image to all 0xff */
 590    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 591 }
 592
 593
 594 /**
 595  * If there's anything in the bitmap cache, draw/flush it now.
 596  */
 597 void
 598 st_flush_bitmap_cache(struct st_context *st)
 599 {
 600    if (!st->bitmap.cache->empty) {
 601       struct bitmap_cache *cache = st->bitmap.cache;
 602
 603       if (st->ctx->DrawBuffer) {
 604          struct pipe_context *pipe = st->pipe;
 605          struct pipe_sampler_view *sv;
 606
 607          assert(cache->xmin <= cache->xmax);
 608
 609 /*         printf("flush size %d x %d  at %d, %d\n",
 610                 cache->xmax - cache->xmin,
 611                 cache->ymax - cache->ymin,
 612                 cache->xpos, cache->ypos);
 613 */
 614
 615          /* The texture transfer has been mapped until now.
 616           * So unmap and release the texture transfer before drawing.
 617           */
 618          if (cache->trans) {
 619             if (0)
 620                print_cache(cache);
 621             pipe_transfer_unmap(pipe, cache->trans);
 622             cache->buffer = NULL;
 623
 624             pipe->transfer_destroy(pipe, cache->trans);
 625             cache->trans = NULL;
 626          }
 627
 628          sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 629          if (sv) {
 630             draw_bitmap_quad(st->ctx,
 631                              cache->xpos,
 632                              cache->ypos,
 633                              cache->zpos,
 634                              BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 635                              sv,
 636                              cache->color);
 637
 638             pipe_sampler_view_reference(&sv, NULL);
 639          }
 640       }
 641
 642       /* release/free the texture */
 643       pipe_resource_reference(&cache->texture, NULL);
 644
 645       reset_cache(st);
 646    }
 647 }
 648
 649 /* Flush bitmap cache and release vertex buffer.
 650  */
 651 void
 652 st_flush_bitmap( struct st_context *st )
 653 {
 654    st_flush_bitmap_cache(st);
 655
 656    /* Release vertex buffer to avoid synchronous rendering if we were
 657     * to map it in the next frame.
 658     */
 659    pipe_resource_reference(&st->bitmap.vbuf, NULL);
 660    st->bitmap.vbuf_slot = 0;
 661 }
 662
 663
 664 /**
 665  * Try to accumulate this glBitmap call in the bitmap cache.
 666  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 667  */
 668 static GLboolean
 669 accum_bitmap(struct st_context *st,
 670              GLint x, GLint y, GLsizei width, GLsizei height,
 671              const struct gl_pixelstore_attrib *unpack,
 672              const GLubyte *bitmap )
 673 {
 674    struct bitmap_cache *cache = st->bitmap.cache;
 675    int px = -999, py = -999;
 676    const GLfloat z = st->ctx->Current.RasterPos[2];
 677
 678    if (width > BITMAP_CACHE_WIDTH ||
 679        height > BITMAP_CACHE_HEIGHT)
 680       return GL_FALSE; /* too big to cache */
 681
 682    if (!cache->empty) {
 683       px = x - cache->xpos;  /* pos in buffer */
 684       py = y - cache->ypos;
 685       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 686           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 687           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 688           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 689          /* This bitmap would extend beyond cache bounds, or the bitmap
 690           * color is changing
 691           * so flush and continue.
 692           */
 693          st_flush_bitmap_cache(st);
 694       }
 695    }
 696
 697    if (cache->empty) {
 698       /* Initialize.  Center bitmap vertically in the buffer. */
 699       px = 0;
 700       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 701       cache->xpos = x;
 702       cache->ypos = y - py;
 703       cache->zpos = z;
 704       cache->empty = GL_FALSE;
 705       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 706    }
 707
 708    assert(px != -999);
 709    assert(py != -999);
 710
 711    if (x < cache->xmin)
 712       cache->xmin = x;
 713    if (y < cache->ymin)
 714       cache->ymin = y;
 715    if (x + width > cache->xmax)
 716       cache->xmax = x + width;
 717    if (y + height > cache->ymax)
 718       cache->ymax = y + height;
 719
 720    /* create the transfer if needed */
 721    create_cache_trans(st);
 722
 723    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 724                  cache->buffer, BITMAP_CACHE_WIDTH);
 725
 726    return GL_TRUE; /* accumulated */
 727 }
 728
 729
 730
 731 /**
 732  * Called via ctx->Driver.Bitmap()
 733  */
 734 static void
 735 st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 736           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 737 {
 738    struct st_context *st = st_context(ctx);
 739    struct pipe_resource *pt;
 740
 741    if (width == 0 || height == 0)
 742       return;
 743
 744    st_validate_state(st);
 745
 746    if (!st->bitmap.vs) {
 747       /* create pass-through vertex shader now */
 748       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 749                                       TGSI_SEMANTIC_COLOR,
 750                                       TGSI_SEMANTIC_GENERIC };
 751       const uint semantic_indexes[] = { 0, 0, 0 };
 752       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 753                                                           semantic_names,
 754                                                           semantic_indexes);
 755    }
 756
 757    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 758       return;
 759
 760    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 761    if (pt) {
 762       struct pipe_sampler_view *sv = st_create_texture_sampler_view(st->pipe, pt);
 763
 764       assert(pt->target == PIPE_TEXTURE_2D);
 765
 766       if (sv) {
 767          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 768                           width, height, sv,
 769                           st->ctx->Current.RasterColor);
 770
 771          pipe_sampler_view_reference(&sv, NULL);
 772       }
 773
 774       /* release/free the texture */
 775       pipe_resource_reference(&pt, NULL);
 776    }
 777 }
 778
 779
 780 /** Per-context init */
 781 void
 782 st_init_bitmap_functions(struct dd_function_table *functions)
 783 {
 784    functions->Bitmap = st_Bitmap;
 785 }
 786
 787
 788 /** Per-context init */
 789 void
 790 st_init_bitmap(struct st_context *st)
 791 {
 792    struct pipe_sampler_state *sampler = &st->bitmap.sampler;
 793    struct pipe_context *pipe = st->pipe;
 794    struct pipe_screen *screen = pipe->screen;
 795
 796    /* init sampler state once */
 797    memset(sampler, 0, sizeof(*sampler));
 798    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 799    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 800    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 801    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 802    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 803    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 804    sampler->normalized_coords = 1;
 805
 806    /* init baseline rasterizer state once */
 807    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 808    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 809
 810    /* find a usable texture format */
 811    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D, 0,
 812                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 813       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 814    }
 815    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM, PIPE_TEXTURE_2D, 0,
 816                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 817       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 818    }
 819    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, PIPE_TEXTURE_2D, 0,
 820                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 821       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 822    }
 823    else {
 824       /* XXX support more formats */
 825       assert(0);
 826    }
 827
 828    /* alloc bitmap cache object */
 829    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 830
 831    reset_cache(st);
 832 }
 833
 834
 835 /** Per-context tear-down */
 836 void
 837 st_destroy_bitmap(struct st_context *st)
 838 {
 839    struct pipe_context *pipe = st->pipe;
 840    struct bitmap_cache *cache = st->bitmap.cache;
 841
 842
 843
 844    if (st->bitmap.vs) {
 845       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 846       st->bitmap.vs = NULL;
 847    }
 848
 849    if (st->bitmap.vbuf) {
 850       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 851       st->bitmap.vbuf = NULL;
 852    }
 853
 854    if (cache) {
 855       if (cache->trans) {
 856          pipe_transfer_unmap(pipe, cache->trans);
 857          pipe->transfer_destroy(pipe, cache->trans);
 858       }
 859       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 860       free(st->bitmap.cache);
 861       st->bitmap.cache = NULL;
 862    }
 863 }
 864
 865 #endif /* FEATURE_drawpix */