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 "main/mfeatures.h"
  47 #include "program/prog_uniform.h"
  48
  49 #include "vbo/vbo.h"
  50
  51 #include "st_context.h"
  52 #include "st_atom.h"
  53 #include "st_cb_bufferobjects.h"
  54 #include "st_draw.h"
  55 #include "st_program.h"
  56
  57 #include "pipe/p_context.h"
  58 #include "pipe/p_defines.h"
  59 #include "util/u_inlines.h"
  60 #include "util/u_format.h"
  61 #include "util/u_prim.h"
  62 #include "util/u_draw_quad.h"
  63 #include "draw/draw_context.h"
  64 #include "cso_cache/cso_context.h"
  65
  66
  67 static GLuint double_types[4] = {
  68    PIPE_FORMAT_R64_FLOAT,
  69    PIPE_FORMAT_R64G64_FLOAT,
  70    PIPE_FORMAT_R64G64B64_FLOAT,
  71    PIPE_FORMAT_R64G64B64A64_FLOAT
  72 };
  73
  74 static GLuint float_types[4] = {
  75    PIPE_FORMAT_R32_FLOAT,
  76    PIPE_FORMAT_R32G32_FLOAT,
  77    PIPE_FORMAT_R32G32B32_FLOAT,
  78    PIPE_FORMAT_R32G32B32A32_FLOAT
  79 };
  80
  81 static GLuint half_float_types[4] = {
  82    PIPE_FORMAT_R16_FLOAT,
  83    PIPE_FORMAT_R16G16_FLOAT,
  84    PIPE_FORMAT_R16G16B16_FLOAT,
  85    PIPE_FORMAT_R16G16B16A16_FLOAT
  86 };
  87
  88 static GLuint uint_types_norm[4] = {
  89    PIPE_FORMAT_R32_UNORM,
  90    PIPE_FORMAT_R32G32_UNORM,
  91    PIPE_FORMAT_R32G32B32_UNORM,
  92    PIPE_FORMAT_R32G32B32A32_UNORM
  93 };
  94
  95 static GLuint uint_types_scale[4] = {
  96    PIPE_FORMAT_R32_USCALED,
  97    PIPE_FORMAT_R32G32_USCALED,
  98    PIPE_FORMAT_R32G32B32_USCALED,
  99    PIPE_FORMAT_R32G32B32A32_USCALED
 100 };
 101
 102 static GLuint int_types_norm[4] = {
 103    PIPE_FORMAT_R32_SNORM,
 104    PIPE_FORMAT_R32G32_SNORM,
 105    PIPE_FORMAT_R32G32B32_SNORM,
 106    PIPE_FORMAT_R32G32B32A32_SNORM
 107 };
 108
 109 static GLuint int_types_scale[4] = {
 110    PIPE_FORMAT_R32_SSCALED,
 111    PIPE_FORMAT_R32G32_SSCALED,
 112    PIPE_FORMAT_R32G32B32_SSCALED,
 113    PIPE_FORMAT_R32G32B32A32_SSCALED
 114 };
 115
 116 static GLuint ushort_types_norm[4] = {
 117    PIPE_FORMAT_R16_UNORM,
 118    PIPE_FORMAT_R16G16_UNORM,
 119    PIPE_FORMAT_R16G16B16_UNORM,
 120    PIPE_FORMAT_R16G16B16A16_UNORM
 121 };
 122
 123 static GLuint ushort_types_scale[4] = {
 124    PIPE_FORMAT_R16_USCALED,
 125    PIPE_FORMAT_R16G16_USCALED,
 126    PIPE_FORMAT_R16G16B16_USCALED,
 127    PIPE_FORMAT_R16G16B16A16_USCALED
 128 };
 129
 130 static GLuint short_types_norm[4] = {
 131    PIPE_FORMAT_R16_SNORM,
 132    PIPE_FORMAT_R16G16_SNORM,
 133    PIPE_FORMAT_R16G16B16_SNORM,
 134    PIPE_FORMAT_R16G16B16A16_SNORM
 135 };
 136
 137 static GLuint short_types_scale[4] = {
 138    PIPE_FORMAT_R16_SSCALED,
 139    PIPE_FORMAT_R16G16_SSCALED,
 140    PIPE_FORMAT_R16G16B16_SSCALED,
 141    PIPE_FORMAT_R16G16B16A16_SSCALED
 142 };
 143
 144 static GLuint ubyte_types_norm[4] = {
 145    PIPE_FORMAT_R8_UNORM,
 146    PIPE_FORMAT_R8G8_UNORM,
 147    PIPE_FORMAT_R8G8B8_UNORM,
 148    PIPE_FORMAT_R8G8B8A8_UNORM
 149 };
 150
 151 static GLuint ubyte_types_scale[4] = {
 152    PIPE_FORMAT_R8_USCALED,
 153    PIPE_FORMAT_R8G8_USCALED,
 154    PIPE_FORMAT_R8G8B8_USCALED,
 155    PIPE_FORMAT_R8G8B8A8_USCALED
 156 };
 157
 158 static GLuint byte_types_norm[4] = {
 159    PIPE_FORMAT_R8_SNORM,
 160    PIPE_FORMAT_R8G8_SNORM,
 161    PIPE_FORMAT_R8G8B8_SNORM,
 162    PIPE_FORMAT_R8G8B8A8_SNORM
 163 };
 164
 165 static GLuint byte_types_scale[4] = {
 166    PIPE_FORMAT_R8_SSCALED,
 167    PIPE_FORMAT_R8G8_SSCALED,
 168    PIPE_FORMAT_R8G8B8_SSCALED,
 169    PIPE_FORMAT_R8G8B8A8_SSCALED
 170 };
 171
 172 static GLuint fixed_types[4] = {
 173    PIPE_FORMAT_R32_FIXED,
 174    PIPE_FORMAT_R32G32_FIXED,
 175    PIPE_FORMAT_R32G32B32_FIXED,
 176    PIPE_FORMAT_R32G32B32A32_FIXED
 177 };
 178
 179
 180
 181 /**
 182  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 183  */
 184 GLuint
 185 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 186                       GLboolean normalized)
 187 {
 188    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 189           type == GL_FIXED || type == GL_HALF_FLOAT);
 190    assert(size >= 1);
 191    assert(size <= 4);
 192    assert(format == GL_RGBA || format == GL_BGRA);
 193
 194    if (format == GL_BGRA) {
 195       /* this is an odd-ball case */
 196       assert(type == GL_UNSIGNED_BYTE);
 197       assert(normalized);
 198       return PIPE_FORMAT_B8G8R8A8_UNORM;
 199    }
 200
 201    if (normalized) {
 202       switch (type) {
 203       case GL_DOUBLE: return double_types[size-1];
 204       case GL_FLOAT: return float_types[size-1];
 205       case GL_HALF_FLOAT: return half_float_types[size-1];
 206       case GL_INT: return int_types_norm[size-1];
 207       case GL_SHORT: return short_types_norm[size-1];
 208       case GL_BYTE: return byte_types_norm[size-1];
 209       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 210       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 211       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 212       case GL_FIXED: return fixed_types[size-1];
 213       default: assert(0); return 0;
 214       }
 215    }
 216    else {
 217       switch (type) {
 218       case GL_DOUBLE: return double_types[size-1];
 219       case GL_FLOAT: return float_types[size-1];
 220       case GL_HALF_FLOAT: return half_float_types[size-1];
 221       case GL_INT: return int_types_scale[size-1];
 222       case GL_SHORT: return short_types_scale[size-1];
 223       case GL_BYTE: return byte_types_scale[size-1];
 224       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 225       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 226       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 227       case GL_FIXED: return fixed_types[size-1];
 228       default: assert(0); return 0;
 229       }
 230    }
 231    return 0; /* silence compiler warning */
 232 }
 233
 234
 235
 236
 237
 238 /**
 239  * Examine the active arrays to determine if we have interleaved
 240  * vertex arrays all living in one VBO, or all living in user space.
 241  * \param userSpace  returns whether the arrays are in user space.
 242  */
 243 static GLboolean
 244 is_interleaved_arrays(const struct st_vertex_program *vp,
 245                       const struct st_vp_variant *vpv,
 246                       const struct gl_client_array **arrays)
 247 {
 248    GLuint attr;
 249    const struct gl_buffer_object *firstBufObj = NULL;
 250    GLint firstStride = -1;
 251    const GLubyte *client_addr = NULL;
 252
 253    for (attr = 0; attr < vpv->num_inputs; attr++) {
 254       const GLuint mesaAttr = vp->index_to_input[attr];
 255       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 256       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 257
 258       if (firstStride < 0) {
 259          firstStride = stride;
 260       }
 261       else if (firstStride != stride) {
 262          return GL_FALSE;
 263       }
 264
 265       if (!bufObj || !bufObj->Name) {
 266          /* Try to detect if the client-space arrays are
 267           * "close" to each other.
 268           */
 269          if (!client_addr) {
 270             client_addr = arrays[mesaAttr]->Ptr;
 271          }
 272          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 273             /* arrays start too far apart */
 274             return GL_FALSE;
 275          }
 276       }
 277       else if (!firstBufObj) {
 278          firstBufObj = bufObj;
 279       }
 280       else if (bufObj != firstBufObj) {
 281          return GL_FALSE;
 282       }
 283    }
 284
 285    return GL_TRUE;
 286 }
 287
 288
 289 /**
 290  * Set up for drawing interleaved arrays that all live in one VBO
 291  * or all live in user space.
 292  * \param vbuffer  returns vertex buffer info
 293  * \param velements  returns vertex element info
 294  */
 295 static void
 296 setup_interleaved_attribs(struct gl_context *ctx,
 297                           const struct st_vertex_program *vp,
 298                           const struct st_vp_variant *vpv,
 299                           const struct gl_client_array **arrays,
 300                           struct pipe_vertex_buffer *vbuffer,
 301                           struct pipe_vertex_element velements[],
 302                           unsigned max_index)
 303 {
 304    struct st_context *st = st_context(ctx);
 305    struct pipe_context *pipe = st->pipe;
 306    GLuint attr;
 307    const GLubyte *low_addr = NULL;
 308
 309    /* Find the lowest address. */
 310    for (attr = 0; attr < vpv->num_inputs; attr++) {
 311       const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 312
 313       low_addr = !low_addr ? start : MIN2(low_addr, start);
 314    }
 315
 316    for (attr = 0; attr < vpv->num_inputs; attr++) {
 317       const GLuint mesaAttr = vp->index_to_input[attr];
 318       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 319       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 320       GLsizei stride = arrays[mesaAttr]->StrideB;
 321
 322       if (attr == 0) {
 323          if (bufobj && bufobj->Name) {
 324             vbuffer->buffer = NULL;
 325             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 326             vbuffer->buffer_offset = pointer_to_offset(low_addr);
 327          } else {
 328             vbuffer->buffer =
 329                pipe_user_buffer_create(pipe->screen, (void*)low_addr,
 330                                        stride * (max_index + 1),
 331                                        PIPE_BIND_VERTEX_BUFFER);
 332             vbuffer->buffer_offset = 0;
 333
 334             /* Track user vertex buffers. */
 335             pipe_resource_reference(&st->user_vb[0], vbuffer->buffer);
 336             st->user_vb_stride[0] = stride;
 337             st->num_user_vbs = 1;
 338          }
 339          vbuffer->stride = stride; /* in bytes */
 340       }
 341
 342       velements[attr].src_offset =
 343          (unsigned) (arrays[mesaAttr]->Ptr - low_addr);
 344       velements[attr].instance_divisor = arrays[mesaAttr]->InstanceDivisor;
 345       velements[attr].vertex_buffer_index = 0;
 346       velements[attr].src_format =
 347          st_pipe_vertex_format(arrays[mesaAttr]->Type,
 348                                arrays[mesaAttr]->Size,
 349                                arrays[mesaAttr]->Format,
 350                                arrays[mesaAttr]->Normalized);
 351       assert(velements[attr].src_format);
 352    }
 353 }
 354
 355
 356 /**
 357  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 358  * vertex attribute.
 359  * \param vbuffer  returns vertex buffer info
 360  * \param velements  returns vertex element info
 361  */
 362 static void
 363 setup_non_interleaved_attribs(struct gl_context *ctx,
 364                               const struct st_vertex_program *vp,
 365                               const struct st_vp_variant *vpv,
 366                               const struct gl_client_array **arrays,
 367                               struct pipe_vertex_buffer vbuffer[],
 368                               struct pipe_vertex_element velements[],
 369                               unsigned max_index)
 370 {
 371    struct st_context *st = st_context(ctx);
 372    struct pipe_context *pipe = st->pipe;
 373    GLuint attr;
 374
 375    for (attr = 0; attr < vpv->num_inputs; attr++) {
 376       const GLuint mesaAttr = vp->index_to_input[attr];
 377       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 378       GLsizei stride = arrays[mesaAttr]->StrideB;
 379
 380       if (bufobj && bufobj->Name) {
 381          /* Attribute data is in a VBO.
 382           * Recall that for VBOs, the gl_client_array->Ptr field is
 383           * really an offset from the start of the VBO, not a pointer.
 384           */
 385          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 386          assert(stobj->buffer);
 387
 388          vbuffer[attr].buffer = NULL;
 389          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 390          vbuffer[attr].buffer_offset = pointer_to_offset(arrays[mesaAttr]->Ptr);
 391       }
 392       else {
 393          /* wrap user data */
 394          if (arrays[mesaAttr]->Ptr) {
 395             vbuffer[attr].buffer =
 396                pipe_user_buffer_create(pipe->screen,
 397                                        (void *) arrays[mesaAttr]->Ptr,
 398                                        stride * (max_index + 1),
 399                                        PIPE_BIND_VERTEX_BUFFER);
 400          }
 401          else {
 402             /* no array, use ctx->Current.Attrib[] value */
 403             uint bytes = sizeof(ctx->Current.Attrib[0]);
 404             vbuffer[attr].buffer =
 405                pipe_user_buffer_create(pipe->screen,
 406                                        (void *) ctx->Current.Attrib[mesaAttr],
 407                                        bytes,
 408                                        PIPE_BIND_VERTEX_BUFFER);
 409             stride = 0;
 410          }
 411
 412          vbuffer[attr].buffer_offset = 0;
 413
 414          /* Track user vertex buffers. */
 415          pipe_resource_reference(&st->user_vb[attr], vbuffer->buffer);
 416          st->user_vb_stride[attr] = stride;
 417          st->num_user_vbs = MAX2(st->num_user_vbs, attr+1);
 418       }
 419
 420       /* common-case setup */
 421       vbuffer[attr].stride = stride; /* in bytes */
 422
 423       velements[attr].src_offset = 0;
 424       velements[attr].instance_divisor = arrays[mesaAttr]->InstanceDivisor;
 425       velements[attr].vertex_buffer_index = attr;
 426       velements[attr].src_format
 427          = st_pipe_vertex_format(arrays[mesaAttr]->Type,
 428                                  arrays[mesaAttr]->Size,
 429                                  arrays[mesaAttr]->Format,
 430                                  arrays[mesaAttr]->Normalized);
 431       assert(velements[attr].src_format);
 432    }
 433 }
 434
 435
 436 static void
 437 setup_index_buffer(struct gl_context *ctx,
 438                    const struct _mesa_index_buffer *ib,
 439                    struct pipe_index_buffer *ibuffer)
 440 {
 441    struct st_context *st = st_context(ctx);
 442    struct pipe_context *pipe = st->pipe;
 443
 444    memset(ibuffer, 0, sizeof(*ibuffer));
 445    if (ib) {
 446       struct gl_buffer_object *bufobj = ib->obj;
 447
 448       switch (ib->type) {
 449       case GL_UNSIGNED_INT:
 450          ibuffer->index_size = 4;
 451          break;
 452       case GL_UNSIGNED_SHORT:
 453          ibuffer->index_size = 2;
 454          break;
 455       case GL_UNSIGNED_BYTE:
 456          ibuffer->index_size = 1;
 457          break;
 458       default:
 459          assert(0);
 460          return;
 461       }
 462
 463       /* get/create the index buffer object */
 464       if (bufobj && bufobj->Name) {
 465          /* elements/indexes are in a real VBO */
 466          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 467          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 468          ibuffer->offset = pointer_to_offset(ib->ptr);
 469       }
 470       else {
 471          /* element/indicies are in user space memory */
 472          ibuffer->buffer =
 473             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 474                                     ib->count * ibuffer->index_size,
 475                                     PIPE_BIND_INDEX_BUFFER);
 476       }
 477    }
 478 }
 479
 480 /**
 481  * Prior to drawing, check that any uniforms referenced by the
 482  * current shader have been set.  If a uniform has not been set,
 483  * issue a warning.
 484  */
 485 static void
 486 check_uniforms(struct gl_context *ctx)
 487 {
 488    struct gl_shader_program *shProg[3] = {
 489       ctx->Shader.CurrentVertexProgram,
 490       ctx->Shader.CurrentGeometryProgram,
 491       ctx->Shader.CurrentFragmentProgram,
 492    };
 493    unsigned j;
 494
 495    for (j = 0; j < 3; j++) {
 496       unsigned i;
 497
 498       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 499          continue;
 500
 501       for (i = 0; i < shProg[j]->Uniforms->NumUniforms; i++) {
 502          const struct gl_uniform *u = &shProg[j]->Uniforms->Uniforms[i];
 503          if (!u->Initialized) {
 504             _mesa_warning(ctx,
 505                           "Using shader with uninitialized uniform: %s",
 506                           u->Name);
 507          }
 508       }
 509    }
 510 }
 511
 512
 513 /**
 514  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 515  * the corresponding Gallium type.
 516  */
 517 static unsigned
 518 translate_prim(const struct gl_context *ctx, unsigned prim)
 519 {
 520    /* GL prims should match Gallium prims, spot-check a few */
 521    assert(GL_POINTS == PIPE_PRIM_POINTS);
 522    assert(GL_QUADS == PIPE_PRIM_QUADS);
 523    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 524
 525    /* Avoid quadstrips if it's easy to do so:
 526     * Note: it's imporant to do the correct trimming if we change the prim type!
 527     * We do that wherever this function is called.
 528     */
 529    if (prim == GL_QUAD_STRIP &&
 530        ctx->Light.ShadeModel != GL_FLAT &&
 531        ctx->Polygon.FrontMode == GL_FILL &&
 532        ctx->Polygon.BackMode == GL_FILL)
 533       prim = GL_TRIANGLE_STRIP;
 534
 535    return prim;
 536 }
 537
 538
 539 static void
 540 st_validate_varrays(struct gl_context *ctx,
 541                     const struct gl_client_array **arrays,
 542                     unsigned max_index)
 543 {
 544    struct st_context *st = st_context(ctx);
 545    const struct st_vertex_program *vp;
 546    const struct st_vp_variant *vpv;
 547    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 548    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 549    unsigned num_vbuffers, num_velements;
 550    GLuint attr;
 551    unsigned i;
 552
 553    /* must get these after state validation! */
 554    vp = st->vp;
 555    vpv = st->vp_variant;
 556
 557    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 558
 559    /* Unreference any user vertex buffers. */
 560    for (i = 0; i < st->num_user_vbs; i++) {
 561       pipe_resource_reference(&st->user_vb[i], NULL);
 562    }
 563    st->num_user_vbs = 0;
 564
 565    /*
 566     * Setup the vbuffer[] and velements[] arrays.
 567     */
 568    if (is_interleaved_arrays(vp, vpv, arrays)) {
 569       setup_interleaved_attribs(ctx, vp, vpv, arrays, vbuffer, velements,
 570                                 max_index);
 571       num_vbuffers = 1;
 572       num_velements = vpv->num_inputs;
 573       if (num_velements == 0)
 574          num_vbuffers = 0;
 575    }
 576    else {
 577       setup_non_interleaved_attribs(ctx, vp, vpv, arrays,
 578                                     vbuffer, velements, max_index);
 579       num_vbuffers = vpv->num_inputs;
 580       num_velements = vpv->num_inputs;
 581    }
 582
 583    cso_set_vertex_buffers(st->cso_context, num_vbuffers, vbuffer);
 584    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 585
 586    /* unreference buffers (frees wrapped user-space buffer objects)
 587     * This is OK, because the pipe driver should reference buffers by itself
 588     * in set_vertex_buffers. */
 589    for (attr = 0; attr < num_vbuffers; attr++) {
 590       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 591       assert(!vbuffer[attr].buffer);
 592    }
 593 }
 594
 595
 596 /**
 597  * This function gets plugged into the VBO module and is called when
 598  * we have something to render.
 599  * Basically, translate the information into the format expected by gallium.
 600  */
 601 void
 602 st_draw_vbo(struct gl_context *ctx,
 603             const struct gl_client_array **arrays,
 604             const struct _mesa_prim *prims,
 605             GLuint nr_prims,
 606             const struct _mesa_index_buffer *ib,
 607             GLboolean index_bounds_valid,
 608             GLuint min_index,
 609             GLuint max_index)
 610 {
 611    struct st_context *st = st_context(ctx);
 612    struct pipe_context *pipe = st->pipe;
 613    struct pipe_index_buffer ibuffer;
 614    struct pipe_draw_info info;
 615    unsigned i;
 616    GLboolean new_array =
 617          st->dirty.st && (st->dirty.mesa & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 618
 619    /* Mesa core state should have been validated already */
 620    assert(ctx->NewState == 0x0);
 621
 622    if (ib) {
 623       /* Gallium probably doesn't want this in some cases. */
 624       if (!index_bounds_valid)
 625          if (!vbo_all_varyings_in_vbos(arrays))
 626             vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 627    } else {
 628       /* Get min/max index for non-indexed drawing. */
 629       min_index = ~0;
 630       max_index = 0;
 631
 632       for (i = 0; i < nr_prims; i++) {
 633          min_index = MIN2(min_index, prims[i].start);
 634          max_index = MAX2(max_index, prims[i].start + prims[i].count - 1);
 635       }
 636    }
 637
 638    /* Validate state. */
 639    if (st->dirty.st) {
 640       GLboolean vertDataEdgeFlags;
 641
 642       /* sanity check for pointer arithmetic below */
 643       assert(sizeof(arrays[0]->Ptr[0]) == 1);
 644
 645       vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 646                           arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 647       if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 648          st->vertdata_edgeflags = vertDataEdgeFlags;
 649          st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 650       }
 651
 652       st_validate_state(st);
 653
 654       if (new_array) {
 655          st_validate_varrays(ctx, arrays, max_index);
 656       }
 657
 658 #if 0
 659       if (MESA_VERBOSE & VERBOSE_GLSL) {
 660          check_uniforms(ctx);
 661       }
 662 #else
 663       (void) check_uniforms;
 664 #endif
 665    }
 666
 667    /* Notify the driver that the content of user buffers may have been
 668     * changed. */
 669    if (!new_array && st->num_user_vbs) {
 670       for (i = 0; i < st->num_user_vbs; i++) {
 671          if (st->user_vb[i]) {
 672             unsigned stride = st->user_vb_stride[i];
 673
 674             if (stride) {
 675                pipe->redefine_user_buffer(pipe, st->user_vb[i],
 676                                           min_index * stride,
 677                                           (max_index + 1 - min_index) * stride);
 678             } else {
 679                /* stride == 0 */
 680                pipe->redefine_user_buffer(pipe, st->user_vb[i],
 681                                           0, st->user_vb[i]->width0);
 682             }
 683          }
 684       }
 685    }
 686
 687    setup_index_buffer(ctx, ib, &ibuffer);
 688    pipe->set_index_buffer(pipe, &ibuffer);
 689
 690    util_draw_init_info(&info);
 691    if (ib) {
 692       info.indexed = TRUE;
 693       if (min_index != ~0 && max_index != ~0) {
 694          info.min_index = min_index;
 695          info.max_index = max_index;
 696       }
 697    }
 698
 699    info.primitive_restart = st->ctx->Array.PrimitiveRestart;
 700    info.restart_index = st->ctx->Array.RestartIndex;
 701
 702    /* do actual drawing */
 703    for (i = 0; i < nr_prims; i++) {
 704       info.mode = translate_prim( ctx, prims[i].mode );
 705       info.start = prims[i].start;
 706       info.count = prims[i].count;
 707       info.instance_count = prims[i].num_instances;
 708       info.index_bias = prims[i].basevertex;
 709       if (!ib) {
 710          info.min_index = info.start;
 711          info.max_index = info.start + info.count - 1;
 712       }
 713
 714       if (u_trim_pipe_prim(info.mode, &info.count))
 715          pipe->draw_vbo(pipe, &info);
 716    }
 717
 718    pipe_resource_reference(&ibuffer.buffer, NULL);
 719 }
 720
 721
 722 void st_init_draw( struct st_context *st )
 723 {
 724    struct gl_context *ctx = st->ctx;
 725
 726    vbo_set_draw_func(ctx, st_draw_vbo);
 727
 728 #if FEATURE_feedback || FEATURE_rastpos
 729    st->draw = draw_create(st->pipe); /* for selection/feedback */
 730
 731    /* Disable draw options that might convert points/lines to tris, etc.
 732     * as that would foul-up feedback/selection mode.
 733     */
 734    draw_wide_line_threshold(st->draw, 1000.0f);
 735    draw_wide_point_threshold(st->draw, 1000.0f);
 736    draw_enable_line_stipple(st->draw, FALSE);
 737    draw_enable_point_sprites(st->draw, FALSE);
 738 #endif
 739 }
 740
 741
 742 void st_destroy_draw( struct st_context *st )
 743 {
 744 #if FEATURE_feedback || FEATURE_rastpos
 745    draw_destroy(st->draw);
 746 #endif
 747 }
 748
 749