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 "main/pbo.h"
  39 #include "program/program.h"
  40 #include "program/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_texture.h"
  48
  49 #include "pipe/p_context.h"
  50 #include "pipe/p_defines.h"
  51 #include "pipe/p_shader_tokens.h"
  52 #include "util/u_inlines.h"
  53 #include "util/u_draw_quad.h"
  54 #include "util/u_simple_shaders.h"
  55 #include "program/prog_instruction.h"
  56 #include "cso_cache/cso_context.h"
  57
  58
  59 #if FEATURE_drawpix
  60
  61 /**
  62  * glBitmaps are drawn as textured quads.  The user's bitmap pattern
  63  * is stored in a texture image.  An alpha8 texture format is used.
  64  * The fragment shader samples a bit (texel) from the texture, then
  65  * discards the fragment if the bit is off.
  66  *
  67  * Note that we actually store the inverse image of the bitmap to
  68  * simplify the fragment program.  An "on" bit gets stored as texel=0x0
  69  * and an "off" bit is stored as texel=0xff.  Then we kill the
  70  * fragment if the negated texel value is less than zero.
  71  */
  72
  73
  74 /**
  75  * The bitmap cache attempts to accumulate multiple glBitmap calls in a
  76  * buffer which is then rendered en mass upon a flush, state change, etc.
  77  * A wide, short buffer is used to target the common case of a series
  78  * of glBitmap calls being used to draw text.
  79  */
  80 static GLboolean UseBitmapCache = GL_TRUE;
  81
  82
  83 #define BITMAP_CACHE_WIDTH  512
  84 #define BITMAP_CACHE_HEIGHT 32
  85
  86 struct bitmap_cache
  87 {
  88    /** Window pos to render the cached image */
  89    GLint xpos, ypos;
  90    /** Bounds of region used in window coords */
  91    GLint xmin, ymin, xmax, ymax;
  92
  93    GLfloat color[4];
  94
  95    /** Bitmap's Z position */
  96    GLfloat zpos;
  97
  98    struct pipe_resource *texture;
  99    struct pipe_transfer *trans;
 100
 101    GLboolean empty;
 102
 103    /** An I8 texture image: */
 104    ubyte *buffer;
 105 };
 106
 107
 108 /** Epsilon for Z comparisons */
 109 #define Z_EPSILON 1e-06
 110
 111
 112 /**
 113  * Make fragment program for glBitmap:
 114  *   Sample the texture and kill the fragment if the bit is 0.
 115  * This program will be combined with the user's fragment program.
 116  */
 117 static struct st_fragment_program *
 118 make_bitmap_fragment_program(struct gl_context *ctx, GLuint samplerIndex)
 119 {
 120    struct st_context *st = st_context(ctx);
 121    struct st_fragment_program *stfp;
 122    struct gl_program *p;
 123    GLuint ic = 0;
 124
 125    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 126    if (!p)
 127       return NULL;
 128
 129    p->NumInstructions = 3;
 130
 131    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 132    if (!p->Instructions) {
 133       ctx->Driver.DeleteProgram(ctx, p);
 134       return NULL;
 135    }
 136    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 137
 138    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
 139    p->Instructions[ic].Opcode = OPCODE_TEX;
 140    p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
 141    p->Instructions[ic].DstReg.Index = 0;
 142    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 143    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 144    p->Instructions[ic].TexSrcUnit = samplerIndex;
 145    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 146    ic++;
 147
 148    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 149    p->Instructions[ic].Opcode = OPCODE_KIL;
 150    p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 151
 152    if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)
 153       p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;
 154
 155    p->Instructions[ic].SrcReg[0].Index = 0;
 156    p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;
 157    ic++;
 158
 159    /* END; */
 160    p->Instructions[ic++].Opcode = OPCODE_END;
 161
 162    assert(ic == p->NumInstructions);
 163
 164    p->InputsRead = FRAG_BIT_TEX0;
 165    p->OutputsWritten = 0x0;
 166    p->SamplersUsed = (1 << samplerIndex);
 167
 168    stfp = (struct st_fragment_program *) p;
 169    stfp->Base.UsesKill = GL_TRUE;
 170
 171    return stfp;
 172 }
 173
 174
 175 static struct gl_program *
 176 make_bitmap_fragment_program_glsl(struct st_context *st,
 177                                   struct st_fragment_program *orig,
 178                                   GLuint samplerIndex)
 179 {
 180    struct gl_context *ctx = st->ctx;
 181    struct st_fragment_program *fp = (struct st_fragment_program *)
 182       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 183
 184    if (!fp)
 185       return NULL;
 186
 187    get_bitmap_visitor(fp, orig->glsl_to_tgsi, samplerIndex);
 188    return &fp->Base.Base;
 189 }
 190
 191
 192 static int
 193 find_free_bit(uint bitfield)
 194 {
 195    int i;
 196    for (i = 0; i < 32; i++) {
 197       if ((bitfield & (1 << i)) == 0) {
 198          return i;
 199       }
 200    }
 201    return -1;
 202 }
 203
 204
 205 /**
 206  * Combine basic bitmap fragment program with the user-defined program.
 207  * \param st  current context
 208  * \param fpIn  the incoming fragment program
 209  * \param fpOut  the new fragment program which does fragment culling
 210  * \param bitmap_sampler  sampler number for the bitmap texture
 211  */
 212 void
 213 st_make_bitmap_fragment_program(struct st_context *st,
 214                                 struct gl_fragment_program *fpIn,
 215                                 struct gl_fragment_program **fpOut,
 216                                 GLuint *bitmap_sampler)
 217 {
 218    struct st_fragment_program *bitmap_prog;
 219    struct st_fragment_program *stfpIn = (struct st_fragment_program *) fpIn;
 220    struct gl_program *newProg;
 221    uint sampler;
 222
 223    /*
 224     * Generate new program which is the user-defined program prefixed
 225     * with the bitmap sampler/kill instructions.
 226     */
 227    sampler = find_free_bit(fpIn->Base.SamplersUsed);
 228
 229    if (stfpIn->glsl_to_tgsi)
 230       newProg = make_bitmap_fragment_program_glsl(st, stfpIn, sampler);
 231    else {
 232       bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);
 233
 234       newProg = _mesa_combine_programs(st->ctx,
 235                                        &bitmap_prog->Base.Base,
 236                                        &fpIn->Base);
 237       /* done with this after combining */
 238       st_reference_fragprog(st, &bitmap_prog, NULL);
 239    }
 240
 241 #if 0
 242    {
 243       printf("Combined bitmap program:\n");
 244       _mesa_print_program(newProg);
 245       printf("InputsRead: 0x%x\n", newProg->InputsRead);
 246       printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
 247       _mesa_print_parameter_list(newProg->Parameters);
 248    }
 249 #endif
 250
 251    /* return results */
 252    *fpOut = (struct gl_fragment_program *) newProg;
 253    *bitmap_sampler = sampler;
 254 }
 255
 256
 257 /**
 258  * Copy user-provide bitmap bits into texture buffer, expanding
 259  * bits into texels.
 260  * "On" bits will set texels to 0x0.
 261  * "Off" bits will not modify texels.
 262  * Note that the image is actually going to be upside down in
 263  * the texture.  We deal with that with texcoords.
 264  */
 265 static void
 266 unpack_bitmap(struct st_context *st,
 267               GLint px, GLint py, GLsizei width, GLsizei height,
 268               const struct gl_pixelstore_attrib *unpack,
 269               const GLubyte *bitmap,
 270               ubyte *destBuffer, uint destStride)
 271 {
 272    destBuffer += py * destStride + px;
 273
 274    _mesa_expand_bitmap(width, height, unpack, bitmap,
 275                        destBuffer, destStride, 0x0);
 276 }
 277
 278
 279 /**
 280  * Create a texture which represents a bitmap image.
 281  */
 282 static struct pipe_resource *
 283 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 284                     const struct gl_pixelstore_attrib *unpack,
 285                     const GLubyte *bitmap)
 286 {
 287    struct st_context *st = st_context(ctx);
 288    struct pipe_context *pipe = st->pipe;
 289    struct pipe_transfer *transfer;
 290    ubyte *dest;
 291    struct pipe_resource *pt;
 292
 293    /* PBO source... */
 294    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 295    if (!bitmap) {
 296       return NULL;
 297    }
 298
 299    /**
 300     * Create texture to hold bitmap pattern.
 301     */
 302    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 303                           0, width, height, 1, 1,
 304                           PIPE_BIND_SAMPLER_VIEW);
 305    if (!pt) {
 306       _mesa_unmap_pbo_source(ctx, unpack);
 307       return NULL;
 308    }
 309
 310    transfer = pipe_get_transfer(st->pipe, pt, 0, 0,
 311                                 PIPE_TRANSFER_WRITE,
 312                                 0, 0, width, height);
 313
 314    dest = pipe_transfer_map(pipe, transfer);
 315
 316    /* Put image into texture transfer */
 317    memset(dest, 0xff, height * transfer->stride);
 318    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 319                  dest, transfer->stride);
 320
 321    _mesa_unmap_pbo_source(ctx, unpack);
 322
 323    /* Release transfer */
 324    pipe_transfer_unmap(pipe, transfer);
 325    pipe->transfer_destroy(pipe, transfer);
 326
 327    return pt;
 328 }
 329
 330 static GLuint
 331 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 332                          int x, int y, int width, int height,
 333                          float z, const float color[4])
 334 {
 335    struct pipe_context *pipe = st->pipe;
 336    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 337    const GLfloat fb_width = (GLfloat)fb->Width;
 338    const GLfloat fb_height = (GLfloat)fb->Height;
 339    const GLfloat x0 = (GLfloat)x;
 340    const GLfloat x1 = (GLfloat)(x + width);
 341    const GLfloat y0 = (GLfloat)y;
 342    const GLfloat y1 = (GLfloat)(y + height);
 343    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 344    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 345    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 346    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 347    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 348    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 349    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 350    GLuint i;
 351
 352    if(!normalized)
 353    {
 354       sRight = (GLfloat) width;
 355       tBot = (GLfloat) height;
 356    }
 357
 358    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 359     * no_flush) updates to buffers where we know there is no conflict
 360     * with previous data.  Currently using max_slots > 1 will cause
 361     * synchronous rendering if the driver flushes its command buffers
 362     * between one bitmap and the next.  Our flush hook below isn't
 363     * sufficient to catch this as the driver doesn't tell us when it
 364     * flushes its own command buffers.  Until this gets fixed, pay the
 365     * price of allocating a new buffer for each bitmap cache-flush to
 366     * avoid synchronous rendering.
 367     */
 368    if (st->bitmap.vbuf_slot >= max_slots) {
 369       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 370       st->bitmap.vbuf_slot = 0;
 371    }
 372
 373    if (!st->bitmap.vbuf) {
 374       st->bitmap.vbuf = pipe_buffer_create(pipe->screen,
 375                                            PIPE_BIND_VERTEX_BUFFER,
 376                                            PIPE_USAGE_STREAM,
 377                                            max_slots *
 378                                            sizeof(st->bitmap.vertices));
 379       if (!st->bitmap.vbuf) {
 380          /* out of memory */
 381          return 0;
 382       }
 383    }
 384
 385    /* Positions are in clip coords since we need to do clipping in case
 386     * the bitmap quad goes beyond the window bounds.
 387     */
 388    st->bitmap.vertices[0][0][0] = clip_x0;
 389    st->bitmap.vertices[0][0][1] = clip_y0;
 390    st->bitmap.vertices[0][2][0] = sLeft;
 391    st->bitmap.vertices[0][2][1] = tTop;
 392
 393    st->bitmap.vertices[1][0][0] = clip_x1;
 394    st->bitmap.vertices[1][0][1] = clip_y0;
 395    st->bitmap.vertices[1][2][0] = sRight;
 396    st->bitmap.vertices[1][2][1] = tTop;
 397
 398    st->bitmap.vertices[2][0][0] = clip_x1;
 399    st->bitmap.vertices[2][0][1] = clip_y1;
 400    st->bitmap.vertices[2][2][0] = sRight;
 401    st->bitmap.vertices[2][2][1] = tBot;
 402
 403    st->bitmap.vertices[3][0][0] = clip_x0;
 404    st->bitmap.vertices[3][0][1] = clip_y1;
 405    st->bitmap.vertices[3][2][0] = sLeft;
 406    st->bitmap.vertices[3][2][1] = tBot;
 407
 408    /* same for all verts: */
 409    for (i = 0; i < 4; i++) {
 410       st->bitmap.vertices[i][0][2] = z;
 411       st->bitmap.vertices[i][0][3] = 1.0f;
 412       st->bitmap.vertices[i][1][0] = color[0];
 413       st->bitmap.vertices[i][1][1] = color[1];
 414       st->bitmap.vertices[i][1][2] = color[2];
 415       st->bitmap.vertices[i][1][3] = color[3];
 416       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 417       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 418    }
 419
 420    /* put vertex data into vbuf */
 421    pipe_buffer_write_nooverlap(st->pipe,
 422                                st->bitmap.vbuf,
 423                                st->bitmap.vbuf_slot
 424                                * sizeof(st->bitmap.vertices),
 425                                sizeof st->bitmap.vertices,
 426                                st->bitmap.vertices);
 427
 428    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 429 }
 430
 431
 432
 433 /**
 434  * Render a glBitmap by drawing a textured quad
 435  */
 436 static void
 437 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 438                  GLsizei width, GLsizei height,
 439                  struct pipe_sampler_view *sv,
 440                  const GLfloat *color)
 441 {
 442    struct st_context *st = st_context(ctx);
 443    struct pipe_context *pipe = st->pipe;
 444    struct cso_context *cso = st->cso_context;
 445    struct st_fp_variant *fpv;
 446    struct st_fp_variant_key key;
 447    GLuint maxSize;
 448    GLuint offset;
 449
 450    memset(&key, 0, sizeof(key));
 451    key.st = st;
 452    key.bitmap = GL_TRUE;
 453
 454    fpv = st_get_fp_variant(st, st->fp, &key);
 455
 456    /* As an optimization, Mesa's fragment programs will sometimes get the
 457     * primary color from a statevar/constant rather than a varying variable.
 458     * when that's the case, we need to ensure that we use the 'color'
 459     * parameter and not the current attribute color (which may have changed
 460     * through glRasterPos and state validation.
 461     * So, we force the proper color here.  Not elegant, but it works.
 462     */
 463    {
 464       GLfloat colorSave[4];
 465       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 466       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 467       st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
 468       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 469    }
 470
 471
 472    /* limit checks */
 473    /* XXX if the bitmap is larger than the max texture size, break
 474     * it up into chunks.
 475     */
 476    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 477                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 478    assert(width <= (GLsizei)maxSize);
 479    assert(height <= (GLsizei)maxSize);
 480
 481    cso_save_rasterizer(cso);
 482    cso_save_samplers(cso);
 483    cso_save_fragment_sampler_views(cso);
 484    cso_save_viewport(cso);
 485    cso_save_fragment_shader(cso);
 486    cso_save_vertex_shader(cso);
 487    cso_save_geometry_shader(cso);
 488    cso_save_vertex_elements(cso);
 489    cso_save_vertex_buffers(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, fpv->driver_shader);
 497
 498    /* vertex shader state: position + texcoord pass-through */
 499    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 500
 501    /* geometry shader state: disabled */
 502    cso_set_geometry_shader_handle(cso, NULL);
 503
 504    /* user samplers, plus our bitmap sampler */
 505    {
 506       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 507       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_samplers);
 508       uint i;
 509       for (i = 0; i < st->state.num_samplers; i++) {
 510          samplers[i] = &st->state.samplers[i];
 511       }
 512       samplers[fpv->bitmap_sampler] =
 513          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 514       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 515    }
 516
 517    /* user textures, plus the bitmap texture */
 518    {
 519       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 520       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_textures);
 521       memcpy(sampler_views, st->state.sampler_views, sizeof(sampler_views));
 522       sampler_views[fpv->bitmap_sampler] = sv;
 523       cso_set_fragment_sampler_views(cso, num, sampler_views);
 524    }
 525
 526    /* viewport state: viewport matching window dims */
 527    {
 528       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 529       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 530       const GLfloat width = (GLfloat)fb->Width;
 531       const GLfloat height = (GLfloat)fb->Height;
 532       struct pipe_viewport_state vp;
 533       vp.scale[0] =  0.5f * width;
 534       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 535       vp.scale[2] = 0.5f;
 536       vp.scale[3] = 1.0f;
 537       vp.translate[0] = 0.5f * width;
 538       vp.translate[1] = 0.5f * height;
 539       vp.translate[2] = 0.5f;
 540       vp.translate[3] = 0.0f;
 541       cso_set_viewport(cso, &vp);
 542    }
 543
 544    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 545
 546    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 547    z = z * 2.0f - 1.0f;
 548
 549    /* draw textured quad */
 550    offset = setup_bitmap_vertex_data(st,
 551                                      sv->texture->target != PIPE_TEXTURE_RECT,
 552                                      x, y, width, height, z, color);
 553
 554    if (st->bitmap.vbuf) {
 555       util_draw_vertex_buffer(pipe, st->cso_context, st->bitmap.vbuf, offset,
 556                               PIPE_PRIM_TRIANGLE_FAN,
 557                               4,  /* verts */
 558                               3); /* attribs/vert */
 559    }
 560
 561    /* restore state */
 562    cso_restore_rasterizer(cso);
 563    cso_restore_samplers(cso);
 564    cso_restore_fragment_sampler_views(cso);
 565    cso_restore_viewport(cso);
 566    cso_restore_fragment_shader(cso);
 567    cso_restore_vertex_shader(cso);
 568    cso_restore_geometry_shader(cso);
 569    cso_restore_vertex_elements(cso);
 570    cso_restore_vertex_buffers(cso);
 571 }
 572
 573
 574 static void
 575 reset_cache(struct st_context *st)
 576 {
 577    struct pipe_context *pipe = st->pipe;
 578    struct bitmap_cache *cache = st->bitmap.cache;
 579
 580    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 581    cache->empty = GL_TRUE;
 582
 583    cache->xmin = 1000000;
 584    cache->xmax = -1000000;
 585    cache->ymin = 1000000;
 586    cache->ymax = -1000000;
 587
 588    if (cache->trans) {
 589       pipe->transfer_destroy(pipe, cache->trans);
 590       cache->trans = NULL;
 591    }
 592
 593    assert(!cache->texture);
 594
 595    /* allocate a new texture */
 596    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 597                                       st->bitmap.tex_format, 0,
 598                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 599                                       1, 1,
 600                                       PIPE_BIND_SAMPLER_VIEW);
 601 }
 602
 603
 604 /** Print bitmap image to stdout (debug) */
 605 static void
 606 print_cache(const struct bitmap_cache *cache)
 607 {
 608    int i, j, k;
 609
 610    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 611       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 612       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 613          if (cache->buffer[k])
 614             printf("X");
 615          else
 616             printf(" ");
 617          k++;
 618       }
 619       printf("\n");
 620    }
 621 }
 622
 623
 624 /**
 625  * Create gallium pipe_transfer object for the bitmap cache.
 626  */
 627 static void
 628 create_cache_trans(struct st_context *st)
 629 {
 630    struct pipe_context *pipe = st->pipe;
 631    struct bitmap_cache *cache = st->bitmap.cache;
 632
 633    if (cache->trans)
 634       return;
 635
 636    /* Map the texture transfer.
 637     * Subsequent glBitmap calls will write into the texture image.
 638     */
 639    cache->trans = pipe_get_transfer(st->pipe, cache->texture, 0, 0,
 640                                     PIPE_TRANSFER_WRITE, 0, 0,
 641                                     BITMAP_CACHE_WIDTH,
 642                                     BITMAP_CACHE_HEIGHT);
 643    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 644
 645    /* init image to all 0xff */
 646    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 647 }
 648
 649
 650 /**
 651  * If there's anything in the bitmap cache, draw/flush it now.
 652  */
 653 void
 654 st_flush_bitmap_cache(struct st_context *st)
 655 {
 656    if (!st->bitmap.cache->empty) {
 657       struct bitmap_cache *cache = st->bitmap.cache;
 658
 659       if (st->ctx->DrawBuffer) {
 660          struct pipe_context *pipe = st->pipe;
 661          struct pipe_sampler_view *sv;
 662
 663          assert(cache->xmin <= cache->xmax);
 664
 665 /*         printf("flush size %d x %d  at %d, %d\n",
 666                 cache->xmax - cache->xmin,
 667                 cache->ymax - cache->ymin,
 668                 cache->xpos, cache->ypos);
 669 */
 670
 671          /* The texture transfer has been mapped until now.
 672           * So unmap and release the texture transfer before drawing.
 673           */
 674          if (cache->trans) {
 675             if (0)
 676                print_cache(cache);
 677             pipe_transfer_unmap(pipe, cache->trans);
 678             cache->buffer = NULL;
 679
 680             pipe->transfer_destroy(pipe, cache->trans);
 681             cache->trans = NULL;
 682          }
 683
 684          sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 685          if (sv) {
 686             draw_bitmap_quad(st->ctx,
 687                              cache->xpos,
 688                              cache->ypos,
 689                              cache->zpos,
 690                              BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 691                              sv,
 692                              cache->color);
 693
 694             pipe_sampler_view_reference(&sv, NULL);
 695          }
 696       }
 697
 698       /* release/free the texture */
 699       pipe_resource_reference(&cache->texture, NULL);
 700
 701       reset_cache(st);
 702    }
 703 }
 704
 705
 706 /**
 707  * Flush bitmap cache and release vertex buffer.
 708  */
 709 void
 710 st_flush_bitmap( struct st_context *st )
 711 {
 712    st_flush_bitmap_cache(st);
 713
 714    /* Release vertex buffer to avoid synchronous rendering if we were
 715     * to map it in the next frame.
 716     */
 717    pipe_resource_reference(&st->bitmap.vbuf, NULL);
 718    st->bitmap.vbuf_slot = 0;
 719 }
 720
 721
 722 /**
 723  * Try to accumulate this glBitmap call in the bitmap cache.
 724  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 725  */
 726 static GLboolean
 727 accum_bitmap(struct st_context *st,
 728              GLint x, GLint y, GLsizei width, GLsizei height,
 729              const struct gl_pixelstore_attrib *unpack,
 730              const GLubyte *bitmap )
 731 {
 732    struct bitmap_cache *cache = st->bitmap.cache;
 733    int px = -999, py = -999;
 734    const GLfloat z = st->ctx->Current.RasterPos[2];
 735
 736    if (width > BITMAP_CACHE_WIDTH ||
 737        height > BITMAP_CACHE_HEIGHT)
 738       return GL_FALSE; /* too big to cache */
 739
 740    if (!cache->empty) {
 741       px = x - cache->xpos;  /* pos in buffer */
 742       py = y - cache->ypos;
 743       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 744           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 745           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 746           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 747          /* This bitmap would extend beyond cache bounds, or the bitmap
 748           * color is changing
 749           * so flush and continue.
 750           */
 751          st_flush_bitmap_cache(st);
 752       }
 753    }
 754
 755    if (cache->empty) {
 756       /* Initialize.  Center bitmap vertically in the buffer. */
 757       px = 0;
 758       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 759       cache->xpos = x;
 760       cache->ypos = y - py;
 761       cache->zpos = z;
 762       cache->empty = GL_FALSE;
 763       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 764    }
 765
 766    assert(px != -999);
 767    assert(py != -999);
 768
 769    if (x < cache->xmin)
 770       cache->xmin = x;
 771    if (y < cache->ymin)
 772       cache->ymin = y;
 773    if (x + width > cache->xmax)
 774       cache->xmax = x + width;
 775    if (y + height > cache->ymax)
 776       cache->ymax = y + height;
 777
 778    /* create the transfer if needed */
 779    create_cache_trans(st);
 780
 781    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 782                  cache->buffer, BITMAP_CACHE_WIDTH);
 783
 784    return GL_TRUE; /* accumulated */
 785 }
 786
 787
 788
 789 /**
 790  * Called via ctx->Driver.Bitmap()
 791  */
 792 static void
 793 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 794           GLsizei width, GLsizei height,
 795           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 796 {
 797    struct st_context *st = st_context(ctx);
 798    struct pipe_resource *pt;
 799
 800    if (width == 0 || height == 0)
 801       return;
 802
 803    st_validate_state(st);
 804
 805    if (!st->bitmap.vs) {
 806       /* create pass-through vertex shader now */
 807       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 808                                       TGSI_SEMANTIC_COLOR,
 809                                       TGSI_SEMANTIC_GENERIC };
 810       const uint semantic_indexes[] = { 0, 0, 0 };
 811       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 812                                                           semantic_names,
 813                                                           semantic_indexes);
 814    }
 815
 816    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 817       return;
 818
 819    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 820    if (pt) {
 821       struct pipe_sampler_view *sv =
 822          st_create_texture_sampler_view(st->pipe, pt);
 823
 824       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 825
 826       if (sv) {
 827          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 828                           width, height, sv,
 829                           st->ctx->Current.RasterColor);
 830
 831          pipe_sampler_view_reference(&sv, NULL);
 832       }
 833
 834       /* release/free the texture */
 835       pipe_resource_reference(&pt, NULL);
 836    }
 837 }
 838
 839
 840 /** Per-context init */
 841 void
 842 st_init_bitmap_functions(struct dd_function_table *functions)
 843 {
 844    functions->Bitmap = st_Bitmap;
 845 }
 846
 847
 848 /** Per-context init */
 849 void
 850 st_init_bitmap(struct st_context *st)
 851 {
 852    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 853    struct pipe_context *pipe = st->pipe;
 854    struct pipe_screen *screen = pipe->screen;
 855
 856    /* init sampler state once */
 857    memset(sampler, 0, sizeof(*sampler));
 858    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 859    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 860    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 861    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 862    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 863    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 864    st->bitmap.samplers[1] = *sampler;
 865    st->bitmap.samplers[1].normalized_coords = 1;
 866
 867    /* init baseline rasterizer state once */
 868    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 869    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 870
 871    /* find a usable texture format */
 872    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 873                                    PIPE_TEXTURE_2D, 0,
 874                                    PIPE_BIND_SAMPLER_VIEW)) {
 875       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 876    }
 877    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 878                                         PIPE_TEXTURE_2D, 0,
 879                                         PIPE_BIND_SAMPLER_VIEW)) {
 880       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 881    }
 882    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 883                                         PIPE_TEXTURE_2D, 0,
 884                                         PIPE_BIND_SAMPLER_VIEW)) {
 885       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 886    }
 887    else {
 888       /* XXX support more formats */
 889       assert(0);
 890    }
 891
 892    /* alloc bitmap cache object */
 893    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 894
 895    reset_cache(st);
 896 }
 897
 898
 899 /** Per-context tear-down */
 900 void
 901 st_destroy_bitmap(struct st_context *st)
 902 {
 903    struct pipe_context *pipe = st->pipe;
 904    struct bitmap_cache *cache = st->bitmap.cache;
 905
 906    if (st->bitmap.vs) {
 907       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 908       st->bitmap.vs = NULL;
 909    }
 910
 911    if (st->bitmap.vbuf) {
 912       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 913       st->bitmap.vbuf = NULL;
 914    }
 915
 916    if (cache) {
 917       if (cache->trans) {
 918          pipe_transfer_unmap(pipe, cache->trans);
 919          pipe->transfer_destroy(pipe, cache->trans);
 920       }
 921       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 922       free(st->bitmap.cache);
 923       st->bitmap.cache = NULL;
 924    }
 925 }
 926
 927 #endif /* FEATURE_drawpix */