src/mesa/state_tracker/st_draw.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  * This file implements the st_draw_vbo() function which is called from
  30  * Mesa's VBO module.  All point/line/triangle rendering is done through
  31  * this function whether the user called glBegin/End, glDrawArrays,
  32  * glDrawElements, glEvalMesh, or glCalList, etc.
  33  *
  34  * We basically convert the VBO's vertex attribute/array information into
  35  * Gallium vertex state, bind the vertex buffer objects and call
  36  * pipe->draw_elements(), pipe->draw_range_elements() or pipe->draw_arrays().
  37  *
  38  * Authors:
  39  *   Keith Whitwell <keith@tungstengraphics.com>
  40  */
  41
  42
  43 #include "main/imports.h"
  44 #include "main/image.h"
  45 #include "main/macros.h"
  46 #include "program/prog_uniform.h"
  47
  48 #include "vbo/vbo.h"
  49
  50 #include "st_context.h"
  51 #include "st_atom.h"
  52 #include "st_cb_bufferobjects.h"
  53 #include "st_draw.h"
  54 #include "st_program.h"
  55
  56 #include "pipe/p_context.h"
  57 #include "pipe/p_defines.h"
  58 #include "util/u_inlines.h"
  59 #include "util/u_format.h"
  60 #include "util/u_prim.h"
  61 #include "util/u_draw_quad.h"
  62 #include "draw/draw_context.h"
  63 #include "cso_cache/cso_context.h"
  64
  65
  66 static GLuint double_types[4] = {
  67    PIPE_FORMAT_R64_FLOAT,
  68    PIPE_FORMAT_R64G64_FLOAT,
  69    PIPE_FORMAT_R64G64B64_FLOAT,
  70    PIPE_FORMAT_R64G64B64A64_FLOAT
  71 };
  72
  73 static GLuint float_types[4] = {
  74    PIPE_FORMAT_R32_FLOAT,
  75    PIPE_FORMAT_R32G32_FLOAT,
  76    PIPE_FORMAT_R32G32B32_FLOAT,
  77    PIPE_FORMAT_R32G32B32A32_FLOAT
  78 };
  79
  80 static GLuint half_float_types[4] = {
  81    PIPE_FORMAT_R16_FLOAT,
  82    PIPE_FORMAT_R16G16_FLOAT,
  83    PIPE_FORMAT_R16G16B16_FLOAT,
  84    PIPE_FORMAT_R16G16B16A16_FLOAT
  85 };
  86
  87 static GLuint uint_types_norm[4] = {
  88    PIPE_FORMAT_R32_UNORM,
  89    PIPE_FORMAT_R32G32_UNORM,
  90    PIPE_FORMAT_R32G32B32_UNORM,
  91    PIPE_FORMAT_R32G32B32A32_UNORM
  92 };
  93
  94 static GLuint uint_types_scale[4] = {
  95    PIPE_FORMAT_R32_USCALED,
  96    PIPE_FORMAT_R32G32_USCALED,
  97    PIPE_FORMAT_R32G32B32_USCALED,
  98    PIPE_FORMAT_R32G32B32A32_USCALED
  99 };
 100
 101 static GLuint int_types_norm[4] = {
 102    PIPE_FORMAT_R32_SNORM,
 103    PIPE_FORMAT_R32G32_SNORM,
 104    PIPE_FORMAT_R32G32B32_SNORM,
 105    PIPE_FORMAT_R32G32B32A32_SNORM
 106 };
 107
 108 static GLuint int_types_scale[4] = {
 109    PIPE_FORMAT_R32_SSCALED,
 110    PIPE_FORMAT_R32G32_SSCALED,
 111    PIPE_FORMAT_R32G32B32_SSCALED,
 112    PIPE_FORMAT_R32G32B32A32_SSCALED
 113 };
 114
 115 static GLuint ushort_types_norm[4] = {
 116    PIPE_FORMAT_R16_UNORM,
 117    PIPE_FORMAT_R16G16_UNORM,
 118    PIPE_FORMAT_R16G16B16_UNORM,
 119    PIPE_FORMAT_R16G16B16A16_UNORM
 120 };
 121
 122 static GLuint ushort_types_scale[4] = {
 123    PIPE_FORMAT_R16_USCALED,
 124    PIPE_FORMAT_R16G16_USCALED,
 125    PIPE_FORMAT_R16G16B16_USCALED,
 126    PIPE_FORMAT_R16G16B16A16_USCALED
 127 };
 128
 129 static GLuint short_types_norm[4] = {
 130    PIPE_FORMAT_R16_SNORM,
 131    PIPE_FORMAT_R16G16_SNORM,
 132    PIPE_FORMAT_R16G16B16_SNORM,
 133    PIPE_FORMAT_R16G16B16A16_SNORM
 134 };
 135
 136 static GLuint short_types_scale[4] = {
 137    PIPE_FORMAT_R16_SSCALED,
 138    PIPE_FORMAT_R16G16_SSCALED,
 139    PIPE_FORMAT_R16G16B16_SSCALED,
 140    PIPE_FORMAT_R16G16B16A16_SSCALED
 141 };
 142
 143 static GLuint ubyte_types_norm[4] = {
 144    PIPE_FORMAT_R8_UNORM,
 145    PIPE_FORMAT_R8G8_UNORM,
 146    PIPE_FORMAT_R8G8B8_UNORM,
 147    PIPE_FORMAT_R8G8B8A8_UNORM
 148 };
 149
 150 static GLuint ubyte_types_scale[4] = {
 151    PIPE_FORMAT_R8_USCALED,
 152    PIPE_FORMAT_R8G8_USCALED,
 153    PIPE_FORMAT_R8G8B8_USCALED,
 154    PIPE_FORMAT_R8G8B8A8_USCALED
 155 };
 156
 157 static GLuint byte_types_norm[4] = {
 158    PIPE_FORMAT_R8_SNORM,
 159    PIPE_FORMAT_R8G8_SNORM,
 160    PIPE_FORMAT_R8G8B8_SNORM,
 161    PIPE_FORMAT_R8G8B8A8_SNORM
 162 };
 163
 164 static GLuint byte_types_scale[4] = {
 165    PIPE_FORMAT_R8_SSCALED,
 166    PIPE_FORMAT_R8G8_SSCALED,
 167    PIPE_FORMAT_R8G8B8_SSCALED,
 168    PIPE_FORMAT_R8G8B8A8_SSCALED
 169 };
 170
 171 static GLuint fixed_types[4] = {
 172    PIPE_FORMAT_R32_FIXED,
 173    PIPE_FORMAT_R32G32_FIXED,
 174    PIPE_FORMAT_R32G32B32_FIXED,
 175    PIPE_FORMAT_R32G32B32A32_FIXED
 176 };
 177
 178
 179
 180 /**
 181  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 182  */
 183 GLuint
 184 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 185                       GLboolean normalized)
 186 {
 187    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 188           type == GL_FIXED || type == GL_HALF_FLOAT);
 189    assert(size >= 1);
 190    assert(size <= 4);
 191    assert(format == GL_RGBA || format == GL_BGRA);
 192
 193    if (format == GL_BGRA) {
 194       /* this is an odd-ball case */
 195       assert(type == GL_UNSIGNED_BYTE);
 196       assert(normalized);
 197       return PIPE_FORMAT_B8G8R8A8_UNORM;
 198    }
 199
 200    if (normalized) {
 201       switch (type) {
 202       case GL_DOUBLE: return double_types[size-1];
 203       case GL_FLOAT: return float_types[size-1];
 204       case GL_HALF_FLOAT: return half_float_types[size-1];
 205       case GL_INT: return int_types_norm[size-1];
 206       case GL_SHORT: return short_types_norm[size-1];
 207       case GL_BYTE: return byte_types_norm[size-1];
 208       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 209       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 210       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 211       case GL_FIXED: return fixed_types[size-1];
 212       default: assert(0); return 0;
 213       }
 214    }
 215    else {
 216       switch (type) {
 217       case GL_DOUBLE: return double_types[size-1];
 218       case GL_FLOAT: return float_types[size-1];
 219       case GL_HALF_FLOAT: return half_float_types[size-1];
 220       case GL_INT: return int_types_scale[size-1];
 221       case GL_SHORT: return short_types_scale[size-1];
 222       case GL_BYTE: return byte_types_scale[size-1];
 223       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 224       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 225       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 226       case GL_FIXED: return fixed_types[size-1];
 227       default: assert(0); return 0;
 228       }
 229    }
 230    return 0; /* silence compiler warning */
 231 }
 232
 233
 234
 235
 236
 237 /**
 238  * Examine the active arrays to determine if we have interleaved
 239  * vertex arrays all living in one VBO, or all living in user space.
 240  * \param userSpace  returns whether the arrays are in user space.
 241  */
 242 static GLboolean
 243 is_interleaved_arrays(const struct st_vertex_program *vp,
 244                       const struct st_vp_varient *vpv,
 245                       const struct gl_client_array **arrays,
 246                       GLboolean *userSpace)
 247 {
 248    GLuint attr;
 249    const struct gl_buffer_object *firstBufObj = NULL;
 250    GLint firstStride = -1;
 251    GLuint num_client_arrays = 0;
 252    const GLubyte *client_addr = NULL;
 253
 254    for (attr = 0; attr < vpv->num_inputs; attr++) {
 255       const GLuint mesaAttr = vp->index_to_input[attr];
 256       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 257       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 258
 259       if (firstStride < 0) {
 260          firstStride = stride;
 261       }
 262       else if (firstStride != stride) {
 263          return GL_FALSE;
 264       }
 265
 266       if (!bufObj || !bufObj->Name) {
 267          num_client_arrays++;
 268          /* Try to detect if the client-space arrays are
 269           * "close" to each other.
 270           */
 271          if (!client_addr) {
 272             client_addr = arrays[mesaAttr]->Ptr;
 273          }
 274          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 275             /* arrays start too far apart */
 276             return GL_FALSE;
 277          }
 278       }
 279       else if (!firstBufObj) {
 280          firstBufObj = bufObj;
 281       }
 282       else if (bufObj != firstBufObj) {
 283          return GL_FALSE;
 284       }
 285    }
 286
 287    *userSpace = (num_client_arrays == vpv->num_inputs);
 288    /* debug_printf("user space: %s (%d arrays, %d inputs)\n",
 289       (int)*userSpace ? "Yes" : "No", num_client_arrays, vp->num_inputs); */
 290
 291    return GL_TRUE;
 292 }
 293
 294
 295 /**
 296  * Compute the memory range occupied by the arrays.
 297  */
 298 static void
 299 get_arrays_bounds(const struct st_vertex_program *vp,
 300                   const struct st_vp_varient *vpv,
 301                   const struct gl_client_array **arrays,
 302                   GLuint max_index,
 303                   const GLubyte **low, const GLubyte **high)
 304 {
 305    const GLubyte *low_addr = NULL;
 306    const GLubyte *high_addr = NULL;
 307    GLuint attr;
 308
 309    /* debug_printf("get_arrays_bounds: Handling %u attrs\n", vpv->num_inputs); */
 310
 311    for (attr = 0; attr < vpv->num_inputs; attr++) {
 312       const GLuint mesaAttr = vp->index_to_input[attr];
 313       const GLint stride = arrays[mesaAttr]->StrideB;
 314       const GLubyte *start = arrays[mesaAttr]->Ptr;
 315       const unsigned sz = (arrays[mesaAttr]->Size *
 316                            _mesa_sizeof_type(arrays[mesaAttr]->Type));
 317       const GLubyte *end = start + (max_index * stride) + sz;
 318
 319       /* debug_printf("attr %u: stride %d size %u start %p end %p\n",
 320          attr, stride, sz, start, end); */
 321
 322       if (attr == 0) {
 323          low_addr = start;
 324          high_addr = end;
 325       }
 326       else {
 327          low_addr = MIN2(low_addr, start);
 328          high_addr = MAX2(high_addr, end);
 329       }
 330    }
 331
 332    *low = low_addr;
 333    *high = high_addr;
 334 }
 335
 336
 337 /**
 338  * Set up for drawing interleaved arrays that all live in one VBO
 339  * or all live in user space.
 340  * \param vbuffer  returns vertex buffer info
 341  * \param velements  returns vertex element info
 342  */
 343 static void
 344 setup_interleaved_attribs(GLcontext *ctx,
 345                           const struct st_vertex_program *vp,
 346                           const struct st_vp_varient *vpv,
 347                           const struct gl_client_array **arrays,
 348                           GLuint max_index,
 349                           GLboolean userSpace,
 350                           struct pipe_vertex_buffer *vbuffer,
 351                           struct pipe_vertex_element velements[])
 352 {
 353    struct st_context *st = st_context(ctx);
 354    struct pipe_context *pipe = st->pipe;
 355    GLuint attr;
 356    const GLubyte *offset0 = NULL;
 357
 358    for (attr = 0; attr < vpv->num_inputs; attr++) {
 359       const GLuint mesaAttr = vp->index_to_input[attr];
 360       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 361       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 362       GLsizei stride = arrays[mesaAttr]->StrideB;
 363
 364       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 365
 366       if (attr == 0) {
 367          const GLubyte *low, *high;
 368
 369          get_arrays_bounds(vp, vpv, arrays, max_index, &low, &high);
 370          /* debug_printf("buffer range: %p %p range %d max index %u\n",
 371             low, high, high - low, max_index); */
 372
 373          offset0 = low;
 374          if (userSpace) {
 375             vbuffer->buffer =
 376                pipe_user_buffer_create(pipe->screen, (void *) low, high - low,
 377                                        PIPE_BIND_VERTEX_BUFFER);
 378             vbuffer->buffer_offset = 0;
 379          }
 380          else {
 381             vbuffer->buffer = NULL;
 382             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 383             vbuffer->buffer_offset = pointer_to_offset(low);
 384          }
 385          vbuffer->stride = stride; /* in bytes */
 386          vbuffer->max_index = max_index;
 387       }
 388
 389       velements[attr].src_offset =
 390          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 391       velements[attr].instance_divisor = 0;
 392       velements[attr].vertex_buffer_index = 0;
 393       velements[attr].src_format =
 394          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 395                                arrays[mesaAttr]->Size,
 396                                arrays[mesaAttr]->Format,
 397                                arrays[mesaAttr]->Normalized);
 398       assert(velements[attr].src_format);
 399    }
 400 }
 401
 402
 403 /**
 404  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 405  * vertex attribute.
 406  * \param vbuffer  returns vertex buffer info
 407  * \param velements  returns vertex element info
 408  */
 409 static void
 410 setup_non_interleaved_attribs(GLcontext *ctx,
 411                               const struct st_vertex_program *vp,
 412                               const struct st_vp_varient *vpv,
 413                               const struct gl_client_array **arrays,
 414                               GLuint max_index,
 415                               GLboolean *userSpace,
 416                               struct pipe_vertex_buffer vbuffer[],
 417                               struct pipe_vertex_element velements[])
 418 {
 419    struct st_context *st = st_context(ctx);
 420    struct pipe_context *pipe = st->pipe;
 421    GLuint attr;
 422
 423    for (attr = 0; attr < vpv->num_inputs; attr++) {
 424       const GLuint mesaAttr = vp->index_to_input[attr];
 425       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 426       GLsizei stride = arrays[mesaAttr]->StrideB;
 427
 428       *userSpace = GL_FALSE;
 429
 430       if (bufobj && bufobj->Name) {
 431          /* Attribute data is in a VBO.
 432           * Recall that for VBOs, the gl_client_array->Ptr field is
 433           * really an offset from the start of the VBO, not a pointer.
 434           */
 435          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 436          assert(stobj->buffer);
 437          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 438
 439          vbuffer[attr].buffer = NULL;
 440          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 441          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 442          velements[attr].src_offset = 0;
 443       }
 444       else {
 445          /* attribute data is in user-space memory, not a VBO */
 446          uint bytes;
 447          /*printf("user-space array %d stride %d\n", attr, stride);*/
 448
 449          *userSpace = GL_TRUE;
 450
 451          /* wrap user data */
 452          if (arrays[mesaAttr]->Ptr) {
 453             /* user's vertex array */
 454             if (arrays[mesaAttr]->StrideB) {
 455                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 456             }
 457             else {
 458                bytes = arrays[mesaAttr]->Size
 459                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 460             }
 461             vbuffer[attr].buffer =
 462                pipe_user_buffer_create(pipe->screen,
 463                                        (void *) arrays[mesaAttr]->Ptr, bytes,
 464                                        PIPE_BIND_VERTEX_BUFFER);
 465          }
 466          else {
 467             /* no array, use ctx->Current.Attrib[] value */
 468             bytes = sizeof(ctx->Current.Attrib[0]);
 469             vbuffer[attr].buffer =
 470                pipe_user_buffer_create(pipe->screen,
 471                                        (void *) ctx->Current.Attrib[mesaAttr],
 472                                        bytes,
 473                                        PIPE_BIND_VERTEX_BUFFER);
 474             stride = 0;
 475          }
 476
 477          vbuffer[attr].buffer_offset = 0;
 478          velements[attr].src_offset = 0;
 479       }
 480
 481       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 482
 483       /* common-case setup */
 484       vbuffer[attr].stride = stride; /* in bytes */
 485       vbuffer[attr].max_index = max_index;
 486       velements[attr].instance_divisor = 0;
 487       velements[attr].vertex_buffer_index = attr;
 488       velements[attr].src_format
 489          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 490                                  arrays[mesaAttr]->Size,
 491                                  arrays[mesaAttr]->Format,
 492                                  arrays[mesaAttr]->Normalized);
 493       assert(velements[attr].src_format);
 494    }
 495 }
 496
 497
 498 static void
 499 setup_index_buffer(GLcontext *ctx,
 500                    const struct _mesa_index_buffer *ib,
 501                    struct pipe_index_buffer *ibuffer)
 502 {
 503    struct st_context *st = st_context(ctx);
 504    struct pipe_context *pipe = st->pipe;
 505
 506    memset(ibuffer, 0, sizeof(*ibuffer));
 507    if (ib) {
 508       struct gl_buffer_object *bufobj = ib->obj;
 509
 510       switch (ib->type) {
 511       case GL_UNSIGNED_INT:
 512          ibuffer->index_size = 4;
 513          break;
 514       case GL_UNSIGNED_SHORT:
 515          ibuffer->index_size = 2;
 516          break;
 517       case GL_UNSIGNED_BYTE:
 518          ibuffer->index_size = 1;
 519          break;
 520       default:
 521          assert(0);
 522          return;
 523       }
 524
 525       /* get/create the index buffer object */
 526       if (bufobj && bufobj->Name) {
 527          /* elements/indexes are in a real VBO */
 528          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 529          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 530          ibuffer->offset = pointer_to_offset(ib->ptr);
 531       }
 532       else {
 533          /* element/indicies are in user space memory */
 534          ibuffer->buffer =
 535             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 536                                     ib->count * ibuffer->index_size,
 537                                     PIPE_BIND_INDEX_BUFFER);
 538       }
 539    }
 540 }
 541
 542 /**
 543  * Prior to drawing, check that any uniforms referenced by the
 544  * current shader have been set.  If a uniform has not been set,
 545  * issue a warning.
 546  */
 547 static void
 548 check_uniforms(GLcontext *ctx)
 549 {
 550    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 551    if (shProg && shProg->LinkStatus) {
 552       GLuint i;
 553       for (i = 0; i < shProg->Uniforms->NumUniforms; i++) {
 554          const struct gl_uniform *u = &shProg->Uniforms->Uniforms[i];
 555          if (!u->Initialized) {
 556             _mesa_warning(ctx,
 557                           "Using shader with uninitialized uniform: %s",
 558                           u->Name);
 559          }
 560       }
 561    }
 562 }
 563
 564
 565 /**
 566  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 567  * the corresponding Gallium type.
 568  */
 569 static unsigned
 570 translate_prim(const GLcontext *ctx, unsigned prim)
 571 {
 572    /* GL prims should match Gallium prims, spot-check a few */
 573    assert(GL_POINTS == PIPE_PRIM_POINTS);
 574    assert(GL_QUADS == PIPE_PRIM_QUADS);
 575    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 576
 577    /* Avoid quadstrips if it's easy to do so:
 578     * Note: it's imporant to do the correct trimming if we change the prim type!
 579     * We do that wherever this function is called.
 580     */
 581    if (prim == GL_QUAD_STRIP &&
 582        ctx->Light.ShadeModel != GL_FLAT &&
 583        ctx->Polygon.FrontMode == GL_FILL &&
 584        ctx->Polygon.BackMode == GL_FILL)
 585       prim = GL_TRIANGLE_STRIP;
 586
 587    return prim;
 588 }
 589
 590
 591
 592 /**
 593  * This function gets plugged into the VBO module and is called when
 594  * we have something to render.
 595  * Basically, translate the information into the format expected by gallium.
 596  */
 597 void
 598 st_draw_vbo(GLcontext *ctx,
 599             const struct gl_client_array **arrays,
 600             const struct _mesa_prim *prims,
 601             GLuint nr_prims,
 602             const struct _mesa_index_buffer *ib,
 603             GLboolean index_bounds_valid,
 604             GLuint min_index,
 605             GLuint max_index)
 606 {
 607    struct st_context *st = st_context(ctx);
 608    struct pipe_context *pipe = st->pipe;
 609    const struct st_vertex_program *vp;
 610    const struct st_vp_varient *vpv;
 611    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 612    GLuint attr;
 613    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 614    unsigned num_vbuffers, num_velements;
 615    struct pipe_index_buffer ibuffer;
 616    GLboolean userSpace = GL_FALSE;
 617    GLboolean vertDataEdgeFlags;
 618    struct pipe_draw_info info;
 619    unsigned i;
 620
 621    /* Mesa core state should have been validated already */
 622    assert(ctx->NewState == 0x0);
 623
 624    /* Gallium probably doesn't want this in some cases. */
 625    if (!index_bounds_valid)
 626       if (!vbo_all_varyings_in_vbos(arrays))
 627          vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 628
 629    /* sanity check for pointer arithmetic below */
 630    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 631
 632    vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 633                        arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 634    if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 635       st->vertdata_edgeflags = vertDataEdgeFlags;
 636       st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 637    }
 638
 639    st_validate_state(st);
 640
 641    /* must get these after state validation! */
 642    vp = st->vp;
 643    vpv = st->vp_varient;
 644
 645 #if 0
 646    if (MESA_VERBOSE & VERBOSE_GLSL) {
 647       check_uniforms(ctx);
 648    }
 649 #else
 650    (void) check_uniforms;
 651 #endif
 652
 653    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 654    /*
 655     * Setup the vbuffer[] and velements[] arrays.
 656     */
 657    if (is_interleaved_arrays(vp, vpv, arrays, &userSpace)) {
 658       /*printf("Draw interleaved\n");*/
 659       setup_interleaved_attribs(ctx, vp, vpv, arrays, max_index, userSpace,
 660                                 vbuffer, velements);
 661       num_vbuffers = 1;
 662       num_velements = vpv->num_inputs;
 663       if (num_velements == 0)
 664          num_vbuffers = 0;
 665    }
 666    else {
 667       /*printf("Draw non-interleaved\n");*/
 668       setup_non_interleaved_attribs(ctx, vp, vpv, arrays, max_index,
 669                                     &userSpace, vbuffer, velements);
 670       num_vbuffers = vpv->num_inputs;
 671       num_velements = vpv->num_inputs;
 672    }
 673
 674 #if 0
 675    {
 676       GLuint i;
 677       for (i = 0; i < num_vbuffers; i++) {
 678          printf("buffers[%d].stride = %u\n", i, vbuffer[i].stride);
 679          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 680          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 681          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 682       }
 683       for (i = 0; i < num_velements; i++) {
 684          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 685          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 686          printf("vlements[%d].format = %s\n", i, util_format_name(velements[i].src_format));
 687       }
 688    }
 689 #endif
 690
 691    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 692    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 693
 694    setup_index_buffer(ctx, ib, &ibuffer);
 695    pipe->set_index_buffer(pipe, &ibuffer);
 696
 697    util_draw_init_info(&info);
 698    if (ib) {
 699       info.indexed = TRUE;
 700       if (min_index != ~0 && max_index != ~0) {
 701          info.min_index = min_index;
 702          info.max_index = max_index;
 703       }
 704    }
 705
 706    /* do actual drawing */
 707    for (i = 0; i < nr_prims; i++) {
 708       info.mode = translate_prim( ctx, prims[i].mode );
 709       info.start = prims[i].start;
 710       info.count = prims[i].count;
 711       info.instance_count = prims[i].num_instances;
 712       info.index_bias = prims[i].basevertex;
 713       if (!ib) {
 714          info.min_index = info.start;
 715          info.max_index = info.start + info.count - 1;
 716       }
 717
 718       if (u_trim_pipe_prim(info.mode, &info.count))
 719          pipe->draw_vbo(pipe, &info);
 720    }
 721
 722    pipe_resource_reference(&ibuffer.buffer, NULL);
 723
 724    /* unreference buffers (frees wrapped user-space buffer objects) */
 725    for (attr = 0; attr < num_vbuffers; attr++) {
 726       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 727       assert(!vbuffer[attr].buffer);
 728    }
 729
 730    if (userSpace)
 731    {
 732       pipe->set_vertex_buffers(pipe, 0, NULL);
 733    }
 734 }
 735
 736
 737 void st_init_draw( struct st_context *st )
 738 {
 739    GLcontext *ctx = st->ctx;
 740
 741    vbo_set_draw_func(ctx, st_draw_vbo);
 742
 743 #if FEATURE_feedback || FEATURE_rastpos
 744    st->draw = draw_create(st->pipe); /* for selection/feedback */
 745
 746    /* Disable draw options that might convert points/lines to tris, etc.
 747     * as that would foul-up feedback/selection mode.
 748     */
 749    draw_wide_line_threshold(st->draw, 1000.0f);
 750    draw_wide_point_threshold(st->draw, 1000.0f);
 751    draw_enable_line_stipple(st->draw, FALSE);
 752    draw_enable_point_sprites(st->draw, FALSE);
 753 #endif
 754 }
 755
 756
 757 void st_destroy_draw( struct st_context *st )
 758 {
 759 #if FEATURE_feedback || FEATURE_rastpos
 760    draw_destroy(st->draw);
 761 #endif
 762 }
 763
 764