st_cb_bitmap.c revision 918199fb0f5d84121e0ac5821168cd0e886b22e9
1/************************************************************************** 2 * 3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 /* 29 * Authors: 30 * Brian Paul 31 */ 32 33#include "main/imports.h" 34#include "main/image.h" 35#include "main/bufferobj.h" 36#include "main/macros.h" 37#include "main/texformat.h" 38#include "shader/program.h" 39#include "shader/prog_parameter.h" 40#include "shader/prog_print.h" 41 42#include "st_context.h" 43#include "st_atom.h" 44#include "st_atom_constbuf.h" 45#include "st_program.h" 46#include "st_cb_bitmap.h" 47#include "st_cb_program.h" 48#include "st_mesa_to_tgsi.h" 49#include "st_texture.h" 50#include "st_inlines.h" 51 52#include "pipe/p_context.h" 53#include "pipe/p_defines.h" 54#include "pipe/p_inlines.h" 55#include "util/u_tile.h" 56#include "util/u_draw_quad.h" 57#include "util/u_simple_shaders.h" 58#include "shader/prog_instruction.h" 59#include "cso_cache/cso_context.h" 60 61 62 63/** 64 * glBitmaps are drawn as textured quads. The user's bitmap pattern 65 * is stored in a texture image. An alpha8 texture format is used. 66 * The fragment shader samples a bit (texel) from the texture, then 67 * discards the fragment if the bit is off. 68 * 69 * Note that we actually store the inverse image of the bitmap to 70 * simplify the fragment program. An "on" bit gets stored as texel=0x0 71 * and an "off" bit is stored as texel=0xff. Then we kill the 72 * fragment if the negated texel value is less than zero. 73 */ 74 75 76/** 77 * The bitmap cache attempts to accumulate multiple glBitmap calls in a 78 * buffer which is then rendered en mass upon a flush, state change, etc. 79 * A wide, short buffer is used to target the common case of a series 80 * of glBitmap calls being used to draw text. 81 */ 82static GLboolean UseBitmapCache = GL_TRUE; 83 84 85#define BITMAP_CACHE_WIDTH 512 86#define BITMAP_CACHE_HEIGHT 32 87 88struct bitmap_cache 89{ 90 /** Window pos to render the cached image */ 91 GLint xpos, ypos; 92 /** Bounds of region used in window coords */ 93 GLint xmin, ymin, xmax, ymax; 94 95 GLfloat color[4]; 96 97 /** Bitmap's Z position */ 98 GLfloat zpos; 99 100 struct pipe_texture *texture; 101 struct pipe_transfer *trans; 102 103 GLboolean empty; 104 105 /** An I8 texture image: */ 106 ubyte *buffer; 107}; 108 109 110/** Epsilon for Z comparisons */ 111#define Z_EPSILON 1e-06 112 113 114/** 115 * Make fragment program for glBitmap: 116 * Sample the texture and kill the fragment if the bit is 0. 117 * This program will be combined with the user's fragment program. 118 */ 119static struct st_fragment_program * 120make_bitmap_fragment_program(GLcontext *ctx, GLuint samplerIndex) 121{ 122 struct st_fragment_program *stfp; 123 struct gl_program *p; 124 GLuint ic = 0; 125 126 p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0); 127 if (!p) 128 return NULL; 129 130 p->NumInstructions = 3; 131 132 p->Instructions = _mesa_alloc_instructions(p->NumInstructions); 133 if (!p->Instructions) { 134 ctx->Driver.DeleteProgram(ctx, p); 135 return NULL; 136 } 137 _mesa_init_instructions(p->Instructions, p->NumInstructions); 138 139 /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */ 140 p->Instructions[ic].Opcode = OPCODE_TEX; 141 p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY; 142 p->Instructions[ic].DstReg.Index = 0; 143 p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT; 144 p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0; 145 p->Instructions[ic].TexSrcUnit = samplerIndex; 146 p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX; 147 ic++; 148 149 /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */ 150 p->Instructions[ic].Opcode = OPCODE_KIL; 151 p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY; 152 153 if (ctx->st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM) 154 p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX; 155 156 p->Instructions[ic].SrcReg[0].Index = 0; 157 p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW; 158 ic++; 159 160 /* END; */ 161 p->Instructions[ic++].Opcode = OPCODE_END; 162 163 assert(ic == p->NumInstructions); 164 165 p->InputsRead = FRAG_BIT_TEX0; 166 p->OutputsWritten = 0x0; 167 p->SamplersUsed = (1 << samplerIndex); 168 169 stfp = (struct st_fragment_program *) p; 170 stfp->Base.UsesKill = GL_TRUE; 171 172 /* No need to send this incomplete program down to hardware: 173 * 174 * st_translate_fragment_program(ctx->st, stfp, NULL); 175 */ 176 177 return stfp; 178} 179 180 181static int 182find_free_bit(uint bitfield) 183{ 184 int i; 185 for (i = 0; i < 32; i++) { 186 if ((bitfield & (1 << i)) == 0) { 187 return i; 188 } 189 } 190 return -1; 191} 192 193 194/** 195 * Combine basic bitmap fragment program with the user-defined program. 196 */ 197static struct st_fragment_program * 198combined_bitmap_fragment_program(GLcontext *ctx) 199{ 200 struct st_context *st = ctx->st; 201 struct st_fragment_program *stfp = st->fp; 202 203 if (!stfp->bitmap_program) { 204 /* 205 * Generate new program which is the user-defined program prefixed 206 * with the bitmap sampler/kill instructions. 207 */ 208 struct st_fragment_program *bitmap_prog; 209 uint sampler; 210 211 sampler = find_free_bit(st->fp->Base.Base.SamplersUsed); 212 bitmap_prog = make_bitmap_fragment_program(ctx, sampler); 213 214 stfp->bitmap_program = (struct st_fragment_program *) 215 _mesa_combine_programs(ctx, 216 &bitmap_prog->Base.Base, &stfp->Base.Base); 217 stfp->bitmap_program->bitmap_sampler = sampler; 218 219 /* done with this after combining */ 220 st_reference_fragprog(st, &bitmap_prog, NULL); 221 222#if 0 223 { 224 struct gl_program *p = &stfp->bitmap_program->Base.Base; 225 printf("Combined bitmap program:\n"); 226 _mesa_print_program(p); 227 printf("InputsRead: 0x%x\n", p->InputsRead); 228 printf("OutputsWritten: 0x%x\n", p->OutputsWritten); 229 _mesa_print_parameter_list(p->Parameters); 230 } 231#endif 232 233 /* translate to TGSI tokens */ 234 st_translate_fragment_program(st, stfp->bitmap_program, NULL); 235 } 236 237 return stfp->bitmap_program; 238} 239 240 241/** 242 * Copy user-provide bitmap bits into texture buffer, expanding 243 * bits into texels. 244 * "On" bits will set texels to 0x0. 245 * "Off" bits will not modify texels. 246 * Note that the image is actually going to be upside down in 247 * the texture. We deal with that with texcoords. 248 */ 249static void 250unpack_bitmap(struct st_context *st, 251 GLint px, GLint py, GLsizei width, GLsizei height, 252 const struct gl_pixelstore_attrib *unpack, 253 const GLubyte *bitmap, 254 ubyte *destBuffer, uint destStride) 255{ 256 destBuffer += py * destStride + px; 257 258 _mesa_expand_bitmap(width, height, unpack, bitmap, 259 destBuffer, destStride, 0x0); 260} 261 262 263/** 264 * Create a texture which represents a bitmap image. 265 */ 266static struct pipe_texture * 267make_bitmap_texture(GLcontext *ctx, GLsizei width, GLsizei height, 268 const struct gl_pixelstore_attrib *unpack, 269 const GLubyte *bitmap) 270{ 271 struct pipe_context *pipe = ctx->st->pipe; 272 struct pipe_screen *screen = pipe->screen; 273 struct pipe_transfer *transfer; 274 ubyte *dest; 275 struct pipe_texture *pt; 276 277 /* PBO source... */ 278 bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap); 279 if (!bitmap) { 280 return NULL; 281 } 282 283 /** 284 * Create texture to hold bitmap pattern. 285 */ 286 pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, ctx->st->bitmap.tex_format, 287 0, width, height, 1, 288 PIPE_TEXTURE_USAGE_SAMPLER); 289 if (!pt) { 290 _mesa_unmap_pbo_source(ctx, unpack); 291 return NULL; 292 } 293 294 transfer = st_no_flush_get_tex_transfer(st_context(ctx), pt, 0, 0, 0, 295 PIPE_TRANSFER_WRITE, 296 0, 0, width, height); 297 298 dest = screen->transfer_map(screen, transfer); 299 300 /* Put image into texture transfer */ 301 memset(dest, 0xff, height * transfer->stride); 302 unpack_bitmap(ctx->st, 0, 0, width, height, unpack, bitmap, 303 dest, transfer->stride); 304 305 _mesa_unmap_pbo_source(ctx, unpack); 306 307 /* Release transfer */ 308 screen->transfer_unmap(screen, transfer); 309 screen->tex_transfer_destroy(transfer); 310 311 return pt; 312} 313 314static GLuint 315setup_bitmap_vertex_data(struct st_context *st, 316 int x, int y, int width, int height, 317 float z, const float color[4]) 318{ 319 struct pipe_context *pipe = st->pipe; 320 const struct gl_framebuffer *fb = st->ctx->DrawBuffer; 321 const GLfloat fb_width = (GLfloat)fb->Width; 322 const GLfloat fb_height = (GLfloat)fb->Height; 323 const GLfloat x0 = (GLfloat)x; 324 const GLfloat x1 = (GLfloat)(x + width); 325 const GLfloat y0 = (GLfloat)y; 326 const GLfloat y1 = (GLfloat)(y + height); 327 const GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0; 328 const GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop; 329 const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0); 330 const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0); 331 const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0); 332 const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0); 333 334 /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as 335 * no_flush) updates to buffers where we know there is no conflict 336 * with previous data. Currently using max_slots > 1 will cause 337 * synchronous rendering if the driver flushes its command buffers 338 * between one bitmap and the next. Our flush hook below isn't 339 * sufficient to catch this as the driver doesn't tell us when it 340 * flushes its own command buffers. Until this gets fixed, pay the 341 * price of allocating a new buffer for each bitmap cache-flush to 342 * avoid synchronous rendering. 343 */ 344 const GLuint max_slots = 1; /* 4096 / sizeof(st->bitmap.vertices); */ 345 GLuint i; 346 347 if (st->bitmap.vbuf_slot >= max_slots) { 348 pipe_buffer_reference(&st->bitmap.vbuf, NULL); 349 st->bitmap.vbuf_slot = 0; 350 } 351 352 if (!st->bitmap.vbuf) { 353 st->bitmap.vbuf = pipe_buffer_create(pipe->screen, 32, 354 PIPE_BUFFER_USAGE_VERTEX, 355 max_slots * 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 st_no_flush_pipe_buffer_write(st, 395 st->bitmap.vbuf, 396 st->bitmap.vbuf_slot * sizeof st->bitmap.vertices, 397 sizeof st->bitmap.vertices, 398 st->bitmap.vertices); 399 400 return st->bitmap.vbuf_slot++ * sizeof st->bitmap.vertices; 401} 402 403 404 405/** 406 * Render a glBitmap by drawing a textured quad 407 */ 408static void 409draw_bitmap_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z, 410 GLsizei width, GLsizei height, 411 struct pipe_texture *pt, 412 const GLfloat *color) 413{ 414 struct st_context *st = ctx->st; 415 struct pipe_context *pipe = ctx->st->pipe; 416 struct cso_context *cso = ctx->st->cso_context; 417 struct st_fragment_program *stfp; 418 GLuint maxSize; 419 GLuint offset; 420 421 stfp = combined_bitmap_fragment_program(ctx); 422 423 /* As an optimization, Mesa's fragment programs will sometimes get the 424 * primary color from a statevar/constant rather than a varying variable. 425 * when that's the case, we need to ensure that we use the 'color' 426 * parameter and not the current attribute color (which may have changed 427 * through glRasterPos and state validation. 428 * So, we force the proper color here. Not elegant, but it works. 429 */ 430 { 431 GLfloat colorSave[4]; 432 COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]); 433 COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color); 434 st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT); 435 COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave); 436 } 437 438 439 /* limit checks */ 440 /* XXX if the bitmap is larger than the max texture size, break 441 * it up into chunks. 442 */ 443 maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1); 444 assert(width <= (GLsizei)maxSize); 445 assert(height <= (GLsizei)maxSize); 446 447 cso_save_rasterizer(cso); 448 cso_save_samplers(cso); 449 cso_save_sampler_textures(cso); 450 cso_save_viewport(cso); 451 cso_save_fragment_shader(cso); 452 cso_save_vertex_shader(cso); 453 454 /* rasterizer state: just scissor */ 455 st->bitmap.rasterizer.scissor = ctx->Scissor.Enabled; 456 cso_set_rasterizer(cso, &st->bitmap.rasterizer); 457 458 /* fragment shader state: TEX lookup program */ 459 cso_set_fragment_shader_handle(cso, stfp->driver_shader); 460 461 /* vertex shader state: position + texcoord pass-through */ 462 cso_set_vertex_shader_handle(cso, st->bitmap.vs); 463 464 /* user samplers, plus our bitmap sampler */ 465 { 466 struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS]; 467 uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_samplers); 468 uint i; 469 for (i = 0; i < st->state.num_samplers; i++) { 470 samplers[i] = &st->state.samplers[i]; 471 } 472 samplers[stfp->bitmap_sampler] = &st->bitmap.sampler; 473 cso_set_samplers(cso, num, (const struct pipe_sampler_state **) samplers); 474 } 475 476 /* user textures, plus the bitmap texture */ 477 { 478 struct pipe_texture *textures[PIPE_MAX_SAMPLERS]; 479 uint num = MAX2(stfp->bitmap_sampler + 1, st->state.num_textures); 480 memcpy(textures, st->state.sampler_texture, sizeof(textures)); 481 textures[stfp->bitmap_sampler] = pt; 482 cso_set_sampler_textures(cso, num, textures); 483 } 484 485 /* viewport state: viewport matching window dims */ 486 { 487 const struct gl_framebuffer *fb = st->ctx->DrawBuffer; 488 const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP); 489 const GLfloat width = (GLfloat)fb->Width; 490 const GLfloat height = (GLfloat)fb->Height; 491 struct pipe_viewport_state vp; 492 vp.scale[0] = 0.5f * width; 493 vp.scale[1] = height * (invert ? -0.5f : 0.5f); 494 vp.scale[2] = 1.0f; 495 vp.scale[3] = 1.0f; 496 vp.translate[0] = 0.5f * width; 497 vp.translate[1] = 0.5f * height; 498 vp.translate[2] = 0.0f; 499 vp.translate[3] = 0.0f; 500 cso_set_viewport(cso, &vp); 501 } 502 503 /* draw textured quad */ 504 offset = setup_bitmap_vertex_data(st, x, y, width, height, z, color); 505 506 util_draw_vertex_buffer(pipe, st->bitmap.vbuf, offset, 507 PIPE_PRIM_TRIANGLE_FAN, 508 4, /* verts */ 509 3); /* attribs/vert */ 510 511 512 /* restore state */ 513 cso_restore_rasterizer(cso); 514 cso_restore_samplers(cso); 515 cso_restore_sampler_textures(cso); 516 cso_restore_viewport(cso); 517 cso_restore_fragment_shader(cso); 518 cso_restore_vertex_shader(cso); 519} 520 521 522static void 523reset_cache(struct st_context *st) 524{ 525 struct pipe_context *pipe = st->pipe; 526 struct pipe_screen *screen = pipe->screen; 527 struct bitmap_cache *cache = st->bitmap.cache; 528 529 //memset(cache->buffer, 0xff, sizeof(cache->buffer)); 530 cache->empty = GL_TRUE; 531 532 cache->xmin = 1000000; 533 cache->xmax = -1000000; 534 cache->ymin = 1000000; 535 cache->ymax = -1000000; 536 537 if (cache->trans) { 538 screen->tex_transfer_destroy(cache->trans); 539 cache->trans = NULL; 540 } 541 542 assert(!cache->texture); 543 544 /* allocate a new texture */ 545 cache->texture = st_texture_create(st, PIPE_TEXTURE_2D, 546 st->bitmap.tex_format, 0, 547 BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 548 1, PIPE_TEXTURE_USAGE_SAMPLER); 549 550} 551 552static void 553create_cache_trans(struct st_context *st) 554{ 555 struct pipe_context *pipe = st->pipe; 556 struct pipe_screen *screen = pipe->screen; 557 struct bitmap_cache *cache = st->bitmap.cache; 558 559 if (cache->trans) 560 return; 561 562 /* Map the texture transfer. 563 * Subsequent glBitmap calls will write into the texture image. 564 */ 565 cache->trans = st_no_flush_get_tex_transfer(st, cache->texture, 0, 0, 0, 566 PIPE_TRANSFER_WRITE, 0, 0, 567 BITMAP_CACHE_WIDTH, 568 BITMAP_CACHE_HEIGHT); 569 cache->buffer = screen->transfer_map(screen, cache->trans); 570 571 /* init image to all 0xff */ 572 memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT); 573} 574 575 576/** 577 * If there's anything in the bitmap cache, draw/flush it now. 578 */ 579void 580st_flush_bitmap_cache(struct st_context *st) 581{ 582 if (!st->bitmap.cache->empty) { 583 struct bitmap_cache *cache = st->bitmap.cache; 584 585 if (st->ctx->DrawBuffer) { 586 struct pipe_context *pipe = st->pipe; 587 struct pipe_screen *screen = pipe->screen; 588 589 assert(cache->xmin <= cache->xmax); 590 591/* printf("flush size %d x %d at %d, %d\n", 592 cache->xmax - cache->xmin, 593 cache->ymax - cache->ymin, 594 cache->xpos, cache->ypos); 595*/ 596 597 /* The texture transfer has been mapped until now. 598 * So unmap and release the texture transfer before drawing. 599 */ 600 if (cache->trans) { 601 screen->transfer_unmap(screen, cache->trans); 602 cache->buffer = NULL; 603 604 screen->tex_transfer_destroy(cache->trans); 605 cache->trans = NULL; 606 } 607 608 draw_bitmap_quad(st->ctx, 609 cache->xpos, 610 cache->ypos, 611 cache->zpos, 612 BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT, 613 cache->texture, 614 cache->color); 615 } 616 617 /* release/free the texture */ 618 pipe_texture_reference(&cache->texture, NULL); 619 620 reset_cache(st); 621 } 622} 623 624/* Flush bitmap cache and release vertex buffer. 625 */ 626void 627st_flush_bitmap( struct st_context *st ) 628{ 629 st_flush_bitmap_cache(st); 630 631 /* Release vertex buffer to avoid synchronous rendering if we were 632 * to map it in the next frame. 633 */ 634 pipe_buffer_reference(&st->bitmap.vbuf, NULL); 635 st->bitmap.vbuf_slot = 0; 636} 637 638 639/** 640 * Try to accumulate this glBitmap call in the bitmap cache. 641 * \return GL_TRUE for success, GL_FALSE if bitmap is too large, etc. 642 */ 643static GLboolean 644accum_bitmap(struct st_context *st, 645 GLint x, GLint y, GLsizei width, GLsizei height, 646 const struct gl_pixelstore_attrib *unpack, 647 const GLubyte *bitmap ) 648{ 649 struct bitmap_cache *cache = st->bitmap.cache; 650 int px = -999, py; 651 const GLfloat z = st->ctx->Current.RasterPos[2]; 652 653 if (width > BITMAP_CACHE_WIDTH || 654 height > BITMAP_CACHE_HEIGHT) 655 return GL_FALSE; /* too big to cache */ 656 657 if (!cache->empty) { 658 px = x - cache->xpos; /* pos in buffer */ 659 py = y - cache->ypos; 660 if (px < 0 || px + width > BITMAP_CACHE_WIDTH || 661 py < 0 || py + height > BITMAP_CACHE_HEIGHT || 662 !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) || 663 ((fabs(z - cache->zpos) > Z_EPSILON))) { 664 /* This bitmap would extend beyond cache bounds, or the bitmap 665 * color is changing 666 * so flush and continue. 667 */ 668 st_flush_bitmap_cache(st); 669 } 670 } 671 672 if (cache->empty) { 673 /* Initialize. Center bitmap vertically in the buffer. */ 674 px = 0; 675 py = (BITMAP_CACHE_HEIGHT - height) / 2; 676 cache->xpos = x; 677 cache->ypos = y - py; 678 cache->zpos = z; 679 cache->empty = GL_FALSE; 680 COPY_4FV(cache->color, st->ctx->Current.RasterColor); 681 } 682 683 assert(px != -999); 684 685 if (x < cache->xmin) 686 cache->xmin = x; 687 if (y < cache->ymin) 688 cache->ymin = y; 689 if (x + width > cache->xmax) 690 cache->xmax = x + width; 691 if (y + height > cache->ymax) 692 cache->ymax = y + height; 693 694 /* create the transfer if needed */ 695 create_cache_trans(st); 696 697 unpack_bitmap(st, px, py, width, height, unpack, bitmap, 698 cache->buffer, BITMAP_CACHE_WIDTH); 699 700 return GL_TRUE; /* accumulated */ 701} 702 703 704 705/** 706 * Called via ctx->Driver.Bitmap() 707 */ 708static void 709st_Bitmap(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, 710 const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap ) 711{ 712 struct st_context *st = ctx->st; 713 struct pipe_texture *pt; 714 715 if (width == 0 || height == 0) 716 return; 717 718 st_validate_state(st); 719 720 if (!st->bitmap.vs) { 721 /* create pass-through vertex shader now */ 722 const uint semantic_names[] = { TGSI_SEMANTIC_POSITION, 723 TGSI_SEMANTIC_COLOR, 724 TGSI_SEMANTIC_GENERIC }; 725 const uint semantic_indexes[] = { 0, 0, 0 }; 726 st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3, 727 semantic_names, 728 semantic_indexes); 729 } 730 731 if (UseBitmapCache && accum_bitmap(st, x, y, width, height, unpack, bitmap)) 732 return; 733 734 pt = make_bitmap_texture(ctx, width, height, unpack, bitmap); 735 if (pt) { 736 assert(pt->target == PIPE_TEXTURE_2D); 737 draw_bitmap_quad(ctx, x, y, ctx->Current.RasterPos[2], 738 width, height, pt, 739 st->ctx->Current.RasterColor); 740 /* release/free the texture */ 741 pipe_texture_reference(&pt, NULL); 742 } 743} 744 745 746/** Per-context init */ 747void 748st_init_bitmap_functions(struct dd_function_table *functions) 749{ 750 functions->Bitmap = st_Bitmap; 751} 752 753 754/** Per-context init */ 755void 756st_init_bitmap(struct st_context *st) 757{ 758 struct pipe_sampler_state *sampler = &st->bitmap.sampler; 759 struct pipe_context *pipe = st->pipe; 760 struct pipe_screen *screen = pipe->screen; 761 762 /* init sampler state once */ 763 memset(sampler, 0, sizeof(*sampler)); 764 sampler->wrap_s = PIPE_TEX_WRAP_CLAMP; 765 sampler->wrap_t = PIPE_TEX_WRAP_CLAMP; 766 sampler->wrap_r = PIPE_TEX_WRAP_CLAMP; 767 sampler->min_img_filter = PIPE_TEX_FILTER_NEAREST; 768 sampler->min_mip_filter = PIPE_TEX_MIPFILTER_NONE; 769 sampler->mag_img_filter = PIPE_TEX_FILTER_NEAREST; 770 sampler->normalized_coords = 1; 771 772 /* init baseline rasterizer state once */ 773 memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer)); 774 st->bitmap.rasterizer.gl_rasterization_rules = 1; 775 776 /* find a usable texture format */ 777 if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM, PIPE_TEXTURE_2D, 778 PIPE_TEXTURE_USAGE_SAMPLER, 0)) { 779 st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM; 780 } 781 else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM, PIPE_TEXTURE_2D, 782 PIPE_TEXTURE_USAGE_SAMPLER, 0)) { 783 st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM; 784 } 785 else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, PIPE_TEXTURE_2D, 786 PIPE_TEXTURE_USAGE_SAMPLER, 0)) { 787 st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM; 788 } 789 else { 790 /* XXX support more formats */ 791 assert(0); 792 } 793 794 /* alloc bitmap cache object */ 795 st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache); 796 797 reset_cache(st); 798} 799 800 801/** Per-context tear-down */ 802void 803st_destroy_bitmap(struct st_context *st) 804{ 805 struct pipe_context *pipe = st->pipe; 806 struct pipe_screen *screen = pipe->screen; 807 struct bitmap_cache *cache = st->bitmap.cache; 808 809 810 811 if (st->bitmap.vs) { 812 cso_delete_vertex_shader(st->cso_context, st->bitmap.vs); 813 st->bitmap.vs = NULL; 814 } 815 816 if (st->bitmap.vbuf) { 817 pipe_buffer_reference(&st->bitmap.vbuf, NULL); 818 st->bitmap.vbuf = NULL; 819 } 820 821 if (cache) { 822 if (cache->trans) { 823 screen->transfer_unmap(screen, cache->trans); 824 screen->tex_transfer_destroy(cache->trans); 825 } 826 pipe_texture_reference(&st->bitmap.cache->texture, NULL); 827 _mesa_free(st->bitmap.cache); 828 st->bitmap.cache = NULL; 829 } 830} 831