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 int
 176 find_free_bit(uint bitfield)
 177 {
 178    int i;
 179    for (i = 0; i < 32; i++) {
 180       if ((bitfield & (1 << i)) == 0) {
 181          return i;
 182       }
 183    }
 184    return -1;
 185 }
 186
 187
 188 /**
 189  * Combine basic bitmap fragment program with the user-defined program.
 190  * \param st  current context
 191  * \param fpIn  the incoming fragment program
 192  * \param fpOut  the new fragment program which does fragment culling
 193  * \param bitmap_sampler  sampler number for the bitmap texture
 194  */
 195 void
 196 st_make_bitmap_fragment_program(struct st_context *st,
 197                                 struct gl_fragment_program *fpIn,
 198                                 struct gl_fragment_program **fpOut,
 199                                 GLuint *bitmap_sampler)
 200 {
 201    struct st_fragment_program *bitmap_prog;
 202    struct gl_program *newProg;
 203    uint sampler;
 204
 205    /*
 206     * Generate new program which is the user-defined program prefixed
 207     * with the bitmap sampler/kill instructions.
 208     */
 209    sampler = find_free_bit(fpIn->Base.SamplersUsed);
 210    bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);
 211
 212    newProg = _mesa_combine_programs(st->ctx,
 213                                     &bitmap_prog->Base.Base,
 214                                     &fpIn->Base);
 215    /* done with this after combining */
 216    st_reference_fragprog(st, &bitmap_prog, NULL);
 217
 218 #if 0
 219    {
 220       printf("Combined bitmap program:\n");
 221       _mesa_print_program(newProg);
 222       printf("InputsRead: 0x%x\n", newProg->InputsRead);
 223       printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
 224       _mesa_print_parameter_list(newProg->Parameters);
 225    }
 226 #endif
 227
 228    /* return results */
 229    *fpOut = (struct gl_fragment_program *) newProg;
 230    *bitmap_sampler = sampler;
 231 }
 232
 233
 234 /**
 235  * Copy user-provide bitmap bits into texture buffer, expanding
 236  * bits into texels.
 237  * "On" bits will set texels to 0x0.
 238  * "Off" bits will not modify texels.
 239  * Note that the image is actually going to be upside down in
 240  * the texture.  We deal with that with texcoords.
 241  */
 242 static void
 243 unpack_bitmap(struct st_context *st,
 244               GLint px, GLint py, GLsizei width, GLsizei height,
 245               const struct gl_pixelstore_attrib *unpack,
 246               const GLubyte *bitmap,
 247               ubyte *destBuffer, uint destStride)
 248 {
 249    destBuffer += py * destStride + px;
 250
 251    _mesa_expand_bitmap(width, height, unpack, bitmap,
 252                        destBuffer, destStride, 0x0);
 253 }
 254
 255
 256 /**
 257  * Create a texture which represents a bitmap image.
 258  */
 259 static struct pipe_resource *
 260 make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,
 261                     const struct gl_pixelstore_attrib *unpack,
 262                     const GLubyte *bitmap)
 263 {
 264    struct st_context *st = st_context(ctx);
 265    struct pipe_context *pipe = st->pipe;
 266    struct pipe_transfer *transfer;
 267    ubyte *dest;
 268    struct pipe_resource *pt;
 269
 270    /* PBO source... */
 271    bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);
 272    if (!bitmap) {
 273       return NULL;
 274    }
 275
 276    /**
 277     * Create texture to hold bitmap pattern.
 278     */
 279    pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,
 280                           0, width, height, 1, 1,
 281                           PIPE_BIND_SAMPLER_VIEW);
 282    if (!pt) {
 283       _mesa_unmap_pbo_source(ctx, unpack);
 284       return NULL;
 285    }
 286
 287    transfer = pipe_get_transfer(st->pipe, pt, 0, 0,
 288                                 PIPE_TRANSFER_WRITE,
 289                                 0, 0, width, height);
 290
 291    dest = pipe_transfer_map(pipe, transfer);
 292
 293    /* Put image into texture transfer */
 294    memset(dest, 0xff, height * transfer->stride);
 295    unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,
 296                  dest, transfer->stride);
 297
 298    _mesa_unmap_pbo_source(ctx, unpack);
 299
 300    /* Release transfer */
 301    pipe_transfer_unmap(pipe, transfer);
 302    pipe->transfer_destroy(pipe, transfer);
 303
 304    return pt;
 305 }
 306
 307 static GLuint
 308 setup_bitmap_vertex_data(struct st_context *st, bool normalized,
 309                          int x, int y, int width, int height,
 310                          float z, const float color[4])
 311 {
 312    struct pipe_context *pipe = st->pipe;
 313    const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 314    const GLfloat fb_width = (GLfloat)fb->Width;
 315    const GLfloat fb_height = (GLfloat)fb->Height;
 316    const GLfloat x0 = (GLfloat)x;
 317    const GLfloat x1 = (GLfloat)(x + width);
 318    const GLfloat y0 = (GLfloat)y;
 319    const GLfloat y1 = (GLfloat)(y + height);
 320    GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;
 321    GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;
 322    const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 323    const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 324    const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 325    const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 326    const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */
 327    GLuint i;
 328
 329    if(!normalized)
 330    {
 331       sRight = width;
 332       tBot = height;
 333    }
 334
 335    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 336     * no_flush) updates to buffers where we know there is no conflict
 337     * with previous data.  Currently using max_slots > 1 will cause
 338     * synchronous rendering if the driver flushes its command buffers
 339     * between one bitmap and the next.  Our flush hook below isn't
 340     * sufficient to catch this as the driver doesn't tell us when it
 341     * flushes its own command buffers.  Until this gets fixed, pay the
 342     * price of allocating a new buffer for each bitmap cache-flush to
 343     * avoid synchronous rendering.
 344     */
 345    if (st->bitmap.vbuf_slot >= max_slots) {
 346       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 347       st->bitmap.vbuf_slot = 0;
 348    }
 349
 350    if (!st->bitmap.vbuf) {
 351       st->bitmap.vbuf = pipe_buffer_create(pipe->screen,
 352                                            PIPE_BIND_VERTEX_BUFFER,
 353                                            PIPE_USAGE_STREAM,
 354                                            max_slots *
 355                                            sizeof(st->bitmap.vertices));
 356    }
 357
 358    /* Positions are in clip coords since we need to do clipping in case
 359     * the bitmap quad goes beyond the window bounds.
 360     */
 361    st->bitmap.vertices[0][0][0] = clip_x0;
 362    st->bitmap.vertices[0][0][1] = clip_y0;
 363    st->bitmap.vertices[0][2][0] = sLeft;
 364    st->bitmap.vertices[0][2][1] = tTop;
 365
 366    st->bitmap.vertices[1][0][0] = clip_x1;
 367    st->bitmap.vertices[1][0][1] = clip_y0;
 368    st->bitmap.vertices[1][2][0] = sRight;
 369    st->bitmap.vertices[1][2][1] = tTop;
 370
 371    st->bitmap.vertices[2][0][0] = clip_x1;
 372    st->bitmap.vertices[2][0][1] = clip_y1;
 373    st->bitmap.vertices[2][2][0] = sRight;
 374    st->bitmap.vertices[2][2][1] = tBot;
 375
 376    st->bitmap.vertices[3][0][0] = clip_x0;
 377    st->bitmap.vertices[3][0][1] = clip_y1;
 378    st->bitmap.vertices[3][2][0] = sLeft;
 379    st->bitmap.vertices[3][2][1] = tBot;
 380
 381    /* same for all verts: */
 382    for (i = 0; i < 4; i++) {
 383       st->bitmap.vertices[i][0][2] = z;
 384       st->bitmap.vertices[i][0][3] = 1.0;
 385       st->bitmap.vertices[i][1][0] = color[0];
 386       st->bitmap.vertices[i][1][1] = color[1];
 387       st->bitmap.vertices[i][1][2] = color[2];
 388       st->bitmap.vertices[i][1][3] = color[3];
 389       st->bitmap.vertices[i][2][2] = 0.0; /*R*/
 390       st->bitmap.vertices[i][2][3] = 1.0; /*Q*/
 391    }
 392
 393    /* put vertex data into vbuf */
 394    pipe_buffer_write_nooverlap(st->pipe,
 395                                st->bitmap.vbuf,
 396                                st->bitmap.vbuf_slot
 397                                * sizeof(st->bitmap.vertices),
 398                                sizeof st->bitmap.vertices,
 399                                st->bitmap.vertices);
 400
 401    return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices;
 402 }
 403
 404
 405
 406 /**
 407  * Render a glBitmap by drawing a textured quad
 408  */
 409 static void
 410 draw_bitmap_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
 411                  GLsizei width, GLsizei height,
 412                  struct pipe_sampler_view *sv,
 413                  const GLfloat *color)
 414 {
 415    struct st_context *st = st_context(ctx);
 416    struct pipe_context *pipe = st->pipe;
 417    struct cso_context *cso = st->cso_context;
 418    struct st_fp_variant *fpv;
 419    struct st_fp_variant_key key;
 420    GLuint maxSize;
 421    GLuint offset;
 422
 423    memset(&key, 0, sizeof(key));
 424    key.st = st;
 425    key.bitmap = GL_TRUE;
 426
 427    fpv = st_get_fp_variant(st, st->fp, &key);
 428
 429    /* As an optimization, Mesa's fragment programs will sometimes get the
 430     * primary color from a statevar/constant rather than a varying variable.
 431     * when that's the case, we need to ensure that we use the 'color'
 432     * parameter and not the current attribute color (which may have changed
 433     * through glRasterPos and state validation.
 434     * So, we force the proper color here.  Not elegant, but it works.
 435     */
 436    {
 437       GLfloat colorSave[4];
 438       COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 439       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);
 440       st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
 441       COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);
 442    }
 443
 444
 445    /* limit checks */
 446    /* XXX if the bitmap is larger than the max texture size, break
 447     * it up into chunks.
 448     */
 449    maxSize = 1 << (pipe->screen->get_param(pipe->screen,
 450                                     PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 451    assert(width <= (GLsizei)maxSize);
 452    assert(height <= (GLsizei)maxSize);
 453
 454    cso_save_rasterizer(cso);
 455    cso_save_samplers(cso);
 456    cso_save_fragment_sampler_views(cso);
 457    cso_save_viewport(cso);
 458    cso_save_fragment_shader(cso);
 459    cso_save_vertex_shader(cso);
 460    cso_save_vertex_elements(cso);
 461    cso_save_vertex_buffers(cso);
 462
 463    /* rasterizer state: just scissor */
 464    st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled;
 465    cso_set_rasterizer(cso, &st->bitmap.rasterizer);
 466
 467    /* fragment shader state: TEX lookup program */
 468    cso_set_fragment_shader_handle(cso, fpv->driver_shader);
 469
 470    /* vertex shader state: position + texcoord pass-through */
 471    cso_set_vertex_shader_handle(cso, st->bitmap.vs);
 472
 473    /* user samplers, plus our bitmap sampler */
 474    {
 475       struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 476       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_samplers);
 477       uint i;
 478       for (i = 0; i < st->state.num_samplers; i++) {
 479          samplers[i] = &st->state.samplers[i];
 480       }
 481       samplers[fpv->bitmap_sampler] =
 482          &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];
 483       cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers);
 484    }
 485
 486    /* user textures, plus the bitmap texture */
 487    {
 488       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 489       uint num = MAX2(fpv->bitmap_sampler + 1, st->state.num_textures);
 490       memcpy(sampler_views, st->state.sampler_views, sizeof(sampler_views));
 491       sampler_views[fpv->bitmap_sampler] = sv;
 492       cso_set_fragment_sampler_views(cso, num, sampler_views);
 493    }
 494
 495    /* viewport state: viewport matching window dims */
 496    {
 497       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 498       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 499       const GLfloat width = (GLfloat)fb->Width;
 500       const GLfloat height = (GLfloat)fb->Height;
 501       struct pipe_viewport_state vp;
 502       vp.scale[0] =  0.5f * width;
 503       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 504       vp.scale[2] = 0.5f;
 505       vp.scale[3] = 1.0f;
 506       vp.translate[0] = 0.5f * width;
 507       vp.translate[1] = 0.5f * height;
 508       vp.translate[2] = 0.5f;
 509       vp.translate[3] = 0.0f;
 510       cso_set_viewport(cso, &vp);
 511    }
 512
 513    cso_set_vertex_elements(cso, 3, st->velems_util_draw);
 514
 515    /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
 516    z = z * 2.0 - 1.0;
 517
 518    /* draw textured quad */
 519    offset = setup_bitmap_vertex_data(st,
 520                                      sv->texture->target != PIPE_TEXTURE_RECT,
 521                                      x, y, width, height, z, color);
 522
 523    util_draw_vertex_buffer(pipe, st->cso_context, st->bitmap.vbuf, offset,
 524                            PIPE_PRIM_TRIANGLE_FAN,
 525                            4,  /* verts */
 526                            3); /* attribs/vert */
 527
 528
 529    /* restore state */
 530    cso_restore_rasterizer(cso);
 531    cso_restore_samplers(cso);
 532    cso_restore_fragment_sampler_views(cso);
 533    cso_restore_viewport(cso);
 534    cso_restore_fragment_shader(cso);
 535    cso_restore_vertex_shader(cso);
 536    cso_restore_vertex_elements(cso);
 537    cso_restore_vertex_buffers(cso);
 538 }
 539
 540
 541 static void
 542 reset_cache(struct st_context *st)
 543 {
 544    struct pipe_context *pipe = st->pipe;
 545    struct bitmap_cache *cache = st->bitmap.cache;
 546
 547    /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/
 548    cache->empty = GL_TRUE;
 549
 550    cache->xmin = 1000000;
 551    cache->xmax = -1000000;
 552    cache->ymin = 1000000;
 553    cache->ymax = -1000000;
 554
 555    if (cache->trans) {
 556       pipe->transfer_destroy(pipe, cache->trans);
 557       cache->trans = NULL;
 558    }
 559
 560    assert(!cache->texture);
 561
 562    /* allocate a new texture */
 563    cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,
 564                                       st->bitmap.tex_format, 0,
 565                                       BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 566                                       1, 1,
 567                                       PIPE_BIND_SAMPLER_VIEW);
 568 }
 569
 570
 571 /** Print bitmap image to stdout (debug) */
 572 static void
 573 print_cache(const struct bitmap_cache *cache)
 574 {
 575    int i, j, k;
 576
 577    for (i = 0; i < BITMAP_CACHE_HEIGHT; i++) {
 578       k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);
 579       for (j = 0; j < BITMAP_CACHE_WIDTH; j++) {
 580          if (cache->buffer[k])
 581             printf("X");
 582          else
 583             printf(" ");
 584          k++;
 585       }
 586       printf("\n");
 587    }
 588 }
 589
 590
 591 /**
 592  * Create gallium pipe_transfer object for the bitmap cache.
 593  */
 594 static void
 595 create_cache_trans(struct st_context *st)
 596 {
 597    struct pipe_context *pipe = st->pipe;
 598    struct bitmap_cache *cache = st->bitmap.cache;
 599
 600    if (cache->trans)
 601       return;
 602
 603    /* Map the texture transfer.
 604     * Subsequent glBitmap calls will write into the texture image.
 605     */
 606    cache->trans = pipe_get_transfer(st->pipe, cache->texture, 0, 0,
 607                                     PIPE_TRANSFER_WRITE, 0, 0,
 608                                     BITMAP_CACHE_WIDTH,
 609                                     BITMAP_CACHE_HEIGHT);
 610    cache->buffer = pipe_transfer_map(pipe, cache->trans);
 611
 612    /* init image to all 0xff */
 613    memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);
 614 }
 615
 616
 617 /**
 618  * If there's anything in the bitmap cache, draw/flush it now.
 619  */
 620 void
 621 st_flush_bitmap_cache(struct st_context *st)
 622 {
 623    if (!st->bitmap.cache->empty) {
 624       struct bitmap_cache *cache = st->bitmap.cache;
 625
 626       if (st->ctx->DrawBuffer) {
 627          struct pipe_context *pipe = st->pipe;
 628          struct pipe_sampler_view *sv;
 629
 630          assert(cache->xmin <= cache->xmax);
 631
 632 /*         printf("flush size %d x %d  at %d, %d\n",
 633                 cache->xmax - cache->xmin,
 634                 cache->ymax - cache->ymin,
 635                 cache->xpos, cache->ypos);
 636 */
 637
 638          /* The texture transfer has been mapped until now.
 639           * So unmap and release the texture transfer before drawing.
 640           */
 641          if (cache->trans) {
 642             if (0)
 643                print_cache(cache);
 644             pipe_transfer_unmap(pipe, cache->trans);
 645             cache->buffer = NULL;
 646
 647             pipe->transfer_destroy(pipe, cache->trans);
 648             cache->trans = NULL;
 649          }
 650
 651          sv = st_create_texture_sampler_view(st->pipe, cache->texture);
 652          if (sv) {
 653             draw_bitmap_quad(st->ctx,
 654                              cache->xpos,
 655                              cache->ypos,
 656                              cache->zpos,
 657                              BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,
 658                              sv,
 659                              cache->color);
 660
 661             pipe_sampler_view_reference(&sv, NULL);
 662          }
 663       }
 664
 665       /* release/free the texture */
 666       pipe_resource_reference(&cache->texture, NULL);
 667
 668       reset_cache(st);
 669    }
 670 }
 671
 672
 673 /**
 674  * Flush bitmap cache and release vertex buffer.
 675  */
 676 void
 677 st_flush_bitmap( struct st_context *st )
 678 {
 679    st_flush_bitmap_cache(st);
 680
 681    /* Release vertex buffer to avoid synchronous rendering if we were
 682     * to map it in the next frame.
 683     */
 684    pipe_resource_reference(&st->bitmap.vbuf, NULL);
 685    st->bitmap.vbuf_slot = 0;
 686 }
 687
 688
 689 /**
 690  * Try to accumulate this glBitmap call in the bitmap cache.
 691  * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.
 692  */
 693 static GLboolean
 694 accum_bitmap(struct st_context *st,
 695              GLint x, GLint y, GLsizei width, GLsizei height,
 696              const struct gl_pixelstore_attrib *unpack,
 697              const GLubyte *bitmap )
 698 {
 699    struct bitmap_cache *cache = st->bitmap.cache;
 700    int px = -999, py = -999;
 701    const GLfloat z = st->ctx->Current.RasterPos[2];
 702
 703    if (width > BITMAP_CACHE_WIDTH ||
 704        height > BITMAP_CACHE_HEIGHT)
 705       return GL_FALSE; /* too big to cache */
 706
 707    if (!cache->empty) {
 708       px = x - cache->xpos;  /* pos in buffer */
 709       py = y - cache->ypos;
 710       if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||
 711           py < 0 || py + height > BITMAP_CACHE_HEIGHT ||
 712           !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||
 713           ((fabs(z - cache->zpos) > Z_EPSILON))) {
 714          /* This bitmap would extend beyond cache bounds, or the bitmap
 715           * color is changing
 716           * so flush and continue.
 717           */
 718          st_flush_bitmap_cache(st);
 719       }
 720    }
 721
 722    if (cache->empty) {
 723       /* Initialize.  Center bitmap vertically in the buffer. */
 724       px = 0;
 725       py = (BITMAP_CACHE_HEIGHT - height) / 2;
 726       cache->xpos = x;
 727       cache->ypos = y - py;
 728       cache->zpos = z;
 729       cache->empty = GL_FALSE;
 730       COPY_4FV(cache->color, st->ctx->Current.RasterColor);
 731    }
 732
 733    assert(px != -999);
 734    assert(py != -999);
 735
 736    if (x < cache->xmin)
 737       cache->xmin = x;
 738    if (y < cache->ymin)
 739       cache->ymin = y;
 740    if (x + width > cache->xmax)
 741       cache->xmax = x + width;
 742    if (y + height > cache->ymax)
 743       cache->ymax = y + height;
 744
 745    /* create the transfer if needed */
 746    create_cache_trans(st);
 747
 748    unpack_bitmap(st, px, py, width, height, unpack, bitmap,
 749                  cache->buffer, BITMAP_CACHE_WIDTH);
 750
 751    return GL_TRUE; /* accumulated */
 752 }
 753
 754
 755
 756 /**
 757  * Called via ctx->Driver.Bitmap()
 758  */
 759 static void
 760 st_Bitmap(struct gl_context *ctx, GLint x, GLint y,
 761           GLsizei width, GLsizei height,
 762           const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )
 763 {
 764    struct st_context *st = st_context(ctx);
 765    struct pipe_resource *pt;
 766
 767    if (width == 0 || height == 0)
 768       return;
 769
 770    st_validate_state(st);
 771
 772    if (!st->bitmap.vs) {
 773       /* create pass-through vertex shader now */
 774       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 775                                       TGSI_SEMANTIC_COLOR,
 776                                       TGSI_SEMANTIC_GENERIC };
 777       const uint semantic_indexes[] = { 0, 0, 0 };
 778       st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,
 779                                                           semantic_names,
 780                                                           semantic_indexes);
 781    }
 782
 783    if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap))
 784       return;
 785
 786    pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);
 787    if (pt) {
 788       struct pipe_sampler_view *sv =
 789          st_create_texture_sampler_view(st->pipe, pt);
 790
 791       assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);
 792
 793       if (sv) {
 794          draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2],
 795                           width, height, sv,
 796                           st->ctx->Current.RasterColor);
 797
 798          pipe_sampler_view_reference(&sv, NULL);
 799       }
 800
 801       /* release/free the texture */
 802       pipe_resource_reference(&pt, NULL);
 803    }
 804 }
 805
 806
 807 /** Per-context init */
 808 void
 809 st_init_bitmap_functions(struct dd_function_table *functions)
 810 {
 811    functions->Bitmap = st_Bitmap;
 812 }
 813
 814
 815 /** Per-context init */
 816 void
 817 st_init_bitmap(struct st_context *st)
 818 {
 819    struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];
 820    struct pipe_context *pipe = st->pipe;
 821    struct pipe_screen *screen = pipe->screen;
 822
 823    /* init sampler state once */
 824    memset(sampler, 0, sizeof(*sampler));
 825    sampler->wrap_s = PIPE_TEX_WRAP_CLAMP;
 826    sampler->wrap_t = PIPE_TEX_WRAP_CLAMP;
 827    sampler->wrap_r = PIPE_TEX_WRAP_CLAMP;
 828    sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST;
 829    sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 830    sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 831    st->bitmap.samplers[1] = *sampler;
 832    st->bitmap.samplers[1].normalized_coords = 1;
 833
 834    /* init baseline rasterizer state once */
 835    memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));
 836    st->bitmap.rasterizer.gl_rasterization_rules = 1;
 837
 838    /* find a usable texture format */
 839    if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,
 840                                    PIPE_TEXTURE_2D, 0,
 841                                    PIPE_BIND_SAMPLER_VIEW, 0)) {
 842       st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;
 843    }
 844    else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,
 845                                         PIPE_TEXTURE_2D, 0,
 846                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 847       st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;
 848    }
 849    else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,
 850                                         PIPE_TEXTURE_2D, 0,
 851                                         PIPE_BIND_SAMPLER_VIEW, 0)) {
 852       st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;
 853    }
 854    else {
 855       /* XXX support more formats */
 856       assert(0);
 857    }
 858
 859    /* alloc bitmap cache object */
 860    st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);
 861
 862    reset_cache(st);
 863 }
 864
 865
 866 /** Per-context tear-down */
 867 void
 868 st_destroy_bitmap(struct st_context *st)
 869 {
 870    struct pipe_context *pipe = st->pipe;
 871    struct bitmap_cache *cache = st->bitmap.cache;
 872
 873    if (st->bitmap.vs) {
 874       cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);
 875       st->bitmap.vs = NULL;
 876    }
 877
 878    if (st->bitmap.vbuf) {
 879       pipe_resource_reference(&st->bitmap.vbuf, NULL);
 880       st->bitmap.vbuf = NULL;
 881    }
 882
 883    if (cache) {
 884       if (cache->trans) {
 885          pipe_transfer_unmap(pipe, cache->trans);
 886          pipe->transfer_destroy(pipe, cache->trans);
 887       }
 888       pipe_resource_reference(&st->bitmap.cache->texture, NULL);
 889       free(st->bitmap.cache);
 890       st->bitmap.cache = NULL;
 891    }
 892 }
 893
 894 #endif /* FEATURE_drawpix */