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_vbo().
  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/bufferobj.h"
  46 #include "main/macros.h"
  47 #include "main/mfeatures.h"
  48 #include "program/prog_uniform.h"
  49
  50 #include "vbo/vbo.h"
  51
  52 #include "st_context.h"
  53 #include "st_atom.h"
  54 #include "st_cb_bufferobjects.h"
  55 #include "st_draw.h"
  56 #include "st_program.h"
  57
  58 #include "pipe/p_context.h"
  59 #include "pipe/p_defines.h"
  60 #include "util/u_inlines.h"
  61 #include "util/u_format.h"
  62 #include "util/u_prim.h"
  63 #include "util/u_draw_quad.h"
  64 #include "draw/draw_context.h"
  65 #include "cso_cache/cso_context.h"
  66
  67
  68 static GLuint double_types[4] = {
  69    PIPE_FORMAT_R64_FLOAT,
  70    PIPE_FORMAT_R64G64_FLOAT,
  71    PIPE_FORMAT_R64G64B64_FLOAT,
  72    PIPE_FORMAT_R64G64B64A64_FLOAT
  73 };
  74
  75 static GLuint float_types[4] = {
  76    PIPE_FORMAT_R32_FLOAT,
  77    PIPE_FORMAT_R32G32_FLOAT,
  78    PIPE_FORMAT_R32G32B32_FLOAT,
  79    PIPE_FORMAT_R32G32B32A32_FLOAT
  80 };
  81
  82 static GLuint half_float_types[4] = {
  83    PIPE_FORMAT_R16_FLOAT,
  84    PIPE_FORMAT_R16G16_FLOAT,
  85    PIPE_FORMAT_R16G16B16_FLOAT,
  86    PIPE_FORMAT_R16G16B16A16_FLOAT
  87 };
  88
  89 static GLuint uint_types_norm[4] = {
  90    PIPE_FORMAT_R32_UNORM,
  91    PIPE_FORMAT_R32G32_UNORM,
  92    PIPE_FORMAT_R32G32B32_UNORM,
  93    PIPE_FORMAT_R32G32B32A32_UNORM
  94 };
  95
  96 static GLuint uint_types_scale[4] = {
  97    PIPE_FORMAT_R32_USCALED,
  98    PIPE_FORMAT_R32G32_USCALED,
  99    PIPE_FORMAT_R32G32B32_USCALED,
 100    PIPE_FORMAT_R32G32B32A32_USCALED
 101 };
 102
 103 static GLuint int_types_norm[4] = {
 104    PIPE_FORMAT_R32_SNORM,
 105    PIPE_FORMAT_R32G32_SNORM,
 106    PIPE_FORMAT_R32G32B32_SNORM,
 107    PIPE_FORMAT_R32G32B32A32_SNORM
 108 };
 109
 110 static GLuint int_types_scale[4] = {
 111    PIPE_FORMAT_R32_SSCALED,
 112    PIPE_FORMAT_R32G32_SSCALED,
 113    PIPE_FORMAT_R32G32B32_SSCALED,
 114    PIPE_FORMAT_R32G32B32A32_SSCALED
 115 };
 116
 117 static GLuint ushort_types_norm[4] = {
 118    PIPE_FORMAT_R16_UNORM,
 119    PIPE_FORMAT_R16G16_UNORM,
 120    PIPE_FORMAT_R16G16B16_UNORM,
 121    PIPE_FORMAT_R16G16B16A16_UNORM
 122 };
 123
 124 static GLuint ushort_types_scale[4] = {
 125    PIPE_FORMAT_R16_USCALED,
 126    PIPE_FORMAT_R16G16_USCALED,
 127    PIPE_FORMAT_R16G16B16_USCALED,
 128    PIPE_FORMAT_R16G16B16A16_USCALED
 129 };
 130
 131 static GLuint short_types_norm[4] = {
 132    PIPE_FORMAT_R16_SNORM,
 133    PIPE_FORMAT_R16G16_SNORM,
 134    PIPE_FORMAT_R16G16B16_SNORM,
 135    PIPE_FORMAT_R16G16B16A16_SNORM
 136 };
 137
 138 static GLuint short_types_scale[4] = {
 139    PIPE_FORMAT_R16_SSCALED,
 140    PIPE_FORMAT_R16G16_SSCALED,
 141    PIPE_FORMAT_R16G16B16_SSCALED,
 142    PIPE_FORMAT_R16G16B16A16_SSCALED
 143 };
 144
 145 static GLuint ubyte_types_norm[4] = {
 146    PIPE_FORMAT_R8_UNORM,
 147    PIPE_FORMAT_R8G8_UNORM,
 148    PIPE_FORMAT_R8G8B8_UNORM,
 149    PIPE_FORMAT_R8G8B8A8_UNORM
 150 };
 151
 152 static GLuint ubyte_types_scale[4] = {
 153    PIPE_FORMAT_R8_USCALED,
 154    PIPE_FORMAT_R8G8_USCALED,
 155    PIPE_FORMAT_R8G8B8_USCALED,
 156    PIPE_FORMAT_R8G8B8A8_USCALED
 157 };
 158
 159 static GLuint byte_types_norm[4] = {
 160    PIPE_FORMAT_R8_SNORM,
 161    PIPE_FORMAT_R8G8_SNORM,
 162    PIPE_FORMAT_R8G8B8_SNORM,
 163    PIPE_FORMAT_R8G8B8A8_SNORM
 164 };
 165
 166 static GLuint byte_types_scale[4] = {
 167    PIPE_FORMAT_R8_SSCALED,
 168    PIPE_FORMAT_R8G8_SSCALED,
 169    PIPE_FORMAT_R8G8B8_SSCALED,
 170    PIPE_FORMAT_R8G8B8A8_SSCALED
 171 };
 172
 173 static GLuint fixed_types[4] = {
 174    PIPE_FORMAT_R32_FIXED,
 175    PIPE_FORMAT_R32G32_FIXED,
 176    PIPE_FORMAT_R32G32B32_FIXED,
 177    PIPE_FORMAT_R32G32B32A32_FIXED
 178 };
 179
 180
 181
 182 /**
 183  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 184  */
 185 enum pipe_format
 186 st_pipe_vertex_format(GLenum type, GLuint size, GLenum format,
 187                       GLboolean normalized)
 188 {
 189    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 190           type == GL_FIXED || type == GL_HALF_FLOAT ||
 191           type == GL_INT_2_10_10_10_REV ||
 192           type == GL_UNSIGNED_INT_2_10_10_10_REV);
 193    assert(size >= 1);
 194    assert(size <= 4);
 195    assert(format == GL_RGBA || format == GL_BGRA);
 196
 197    if (type == GL_INT_2_10_10_10_REV ||
 198        type == GL_UNSIGNED_INT_2_10_10_10_REV) {
 199       assert(size == 4);
 200
 201       if (format == GL_BGRA) {
 202          if (type == GL_INT_2_10_10_10_REV) {
 203             if (normalized)
 204                return PIPE_FORMAT_B10G10R10A2_SNORM;
 205             else
 206                return PIPE_FORMAT_B10G10R10A2_SSCALED;
 207          } else {
 208             if (normalized)
 209                return PIPE_FORMAT_B10G10R10A2_UNORM;
 210             else
 211                return PIPE_FORMAT_B10G10R10A2_USCALED;
 212          }
 213       } else {
 214          if (type == GL_INT_2_10_10_10_REV) {
 215             if (normalized)
 216                return PIPE_FORMAT_R10G10B10A2_SNORM;
 217             else
 218                return PIPE_FORMAT_R10G10B10A2_SSCALED;
 219          } else {
 220             if (normalized)
 221                return PIPE_FORMAT_R10G10B10A2_UNORM;
 222             else
 223                return PIPE_FORMAT_R10G10B10A2_USCALED;
 224          }
 225       }
 226    }
 227
 228    if (format == GL_BGRA) {
 229       /* this is an odd-ball case */
 230       assert(type == GL_UNSIGNED_BYTE);
 231       assert(normalized);
 232       return PIPE_FORMAT_B8G8R8A8_UNORM;
 233    }
 234
 235    if (normalized) {
 236       switch (type) {
 237       case GL_DOUBLE: return double_types[size-1];
 238       case GL_FLOAT: return float_types[size-1];
 239       case GL_HALF_FLOAT: return half_float_types[size-1];
 240       case GL_INT: return int_types_norm[size-1];
 241       case GL_SHORT: return short_types_norm[size-1];
 242       case GL_BYTE: return byte_types_norm[size-1];
 243       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 244       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 245       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 246       case GL_FIXED: return fixed_types[size-1];
 247       default: assert(0); return 0;
 248       }
 249    }
 250    else {
 251       switch (type) {
 252       case GL_DOUBLE: return double_types[size-1];
 253       case GL_FLOAT: return float_types[size-1];
 254       case GL_HALF_FLOAT: return half_float_types[size-1];
 255       case GL_INT: return int_types_scale[size-1];
 256       case GL_SHORT: return short_types_scale[size-1];
 257       case GL_BYTE: return byte_types_scale[size-1];
 258       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 259       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 260       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 261       case GL_FIXED: return fixed_types[size-1];
 262       default: assert(0); return 0;
 263       }
 264    }
 265    return PIPE_FORMAT_NONE; /* silence compiler warning */
 266 }
 267
 268
 269 /**
 270  * This is very similar to vbo_all_varyings_in_vbos() but we test
 271  * the stride.  See bug 38626.
 272  */
 273 static GLboolean
 274 all_varyings_in_vbos(const struct gl_client_array *arrays[])
 275 {
 276    GLuint i;
 277
 278    for (i = 0; i < VERT_ATTRIB_MAX; i++)
 279       if (arrays[i]->StrideB && !_mesa_is_bufferobj(arrays[i]->BufferObj))
 280          return GL_FALSE;
 281
 282    return GL_TRUE;
 283 }
 284
 285
 286 /**
 287  * Examine the active arrays to determine if we have interleaved
 288  * vertex arrays all living in one VBO, or all living in user space.
 289  */
 290 static GLboolean
 291 is_interleaved_arrays(const struct st_vertex_program *vp,
 292                       const struct st_vp_variant *vpv,
 293                       const struct gl_client_array **arrays)
 294 {
 295    GLuint attr;
 296    const struct gl_buffer_object *firstBufObj = NULL;
 297    GLint firstStride = -1;
 298    const GLubyte *firstPtr = NULL;
 299    GLboolean userSpaceBuffer = GL_FALSE;
 300
 301    for (attr = 0; attr < vpv->num_inputs; attr++) {
 302       const GLuint mesaAttr = vp->index_to_input[attr];
 303       const struct gl_client_array *array = arrays[mesaAttr];
 304       const struct gl_buffer_object *bufObj = array->BufferObj;
 305       const GLsizei stride = array->StrideB; /* in bytes */
 306
 307       if (attr == 0) {
 308          /* save info about the first array */
 309          firstStride = stride;
 310          firstPtr = array->Ptr;
 311          firstBufObj = bufObj;
 312          userSpaceBuffer = !bufObj || !bufObj->Name;
 313       }
 314       else {
 315          /* check if other arrays interleave with the first, in same buffer */
 316          if (stride != firstStride)
 317             return GL_FALSE; /* strides don't match */
 318
 319          if (bufObj != firstBufObj)
 320             return GL_FALSE; /* arrays in different VBOs */
 321
 322          if (abs(array->Ptr - firstPtr) > firstStride)
 323             return GL_FALSE; /* arrays start too far apart */
 324
 325          if ((!bufObj || !_mesa_is_bufferobj(bufObj)) != userSpaceBuffer)
 326             return GL_FALSE; /* mix of VBO and user-space arrays */
 327       }
 328    }
 329
 330    return GL_TRUE;
 331 }
 332
 333
 334 /**
 335  * Set up for drawing interleaved arrays that all live in one VBO
 336  * or all live in user space.
 337  * \param vbuffer  returns vertex buffer info
 338  * \param velements  returns vertex element info
 339  */
 340 static void
 341 setup_interleaved_attribs(struct gl_context *ctx,
 342                           const struct st_vertex_program *vp,
 343                           const struct st_vp_variant *vpv,
 344                           const struct gl_client_array **arrays,
 345                           struct pipe_vertex_buffer *vbuffer,
 346                           struct pipe_vertex_element velements[],
 347                           unsigned max_index,
 348                           unsigned num_instances)
 349 {
 350    struct st_context *st = st_context(ctx);
 351    struct pipe_context *pipe = st->pipe;
 352    GLuint attr;
 353    const GLubyte *low_addr = NULL;
 354
 355    /* Find the lowest address of the arrays we're drawing */
 356    if (vpv->num_inputs) {
 357       low_addr = arrays[vp->index_to_input[0]]->Ptr;
 358
 359       for (attr = 1; attr < vpv->num_inputs; attr++) {
 360          const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
 361          low_addr = MIN2(low_addr, start);
 362       }
 363    }
 364
 365    for (attr = 0; attr < vpv->num_inputs; attr++) {
 366       const GLuint mesaAttr = vp->index_to_input[attr];
 367       const struct gl_client_array *array = arrays[mesaAttr];
 368       struct gl_buffer_object *bufobj = array->BufferObj;
 369       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 370       unsigned src_offset = (unsigned) (array->Ptr - low_addr);
 371       GLuint element_size = array->_ElementSize;
 372       GLsizei stride = array->StrideB;
 373
 374       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 375
 376       if (attr == 0) {
 377          if (bufobj && _mesa_is_bufferobj(bufobj)) {
 378             vbuffer->buffer = NULL;
 379             pipe_resource_reference(&vbuffer->buffer, stobj->buffer);
 380             vbuffer->buffer_offset = pointer_to_offset(low_addr);
 381          }
 382          else {
 383             uint divisor = array->InstanceDivisor;
 384             uint last_index = divisor ? num_instances / divisor : max_index;
 385             uint bytes = src_offset + stride * last_index + element_size;
 386
 387             vbuffer->buffer = pipe_user_buffer_create(pipe->screen,
 388                                                       (void*) low_addr,
 389                                                       bytes,
 390                                                       PIPE_BIND_VERTEX_BUFFER);
 391             vbuffer->buffer_offset = 0;
 392
 393             /* Track user vertex buffers. */
 394             pipe_resource_reference(&st->user_attrib[0].buffer, vbuffer->buffer);
 395             st->user_attrib[0].element_size = element_size;
 396             st->user_attrib[0].stride = stride;
 397             st->num_user_attribs = 1;
 398          }
 399          vbuffer->stride = stride; /* in bytes */
 400       }
 401
 402       velements[attr].src_offset = src_offset;
 403       velements[attr].instance_divisor = array->InstanceDivisor;
 404       velements[attr].vertex_buffer_index = 0;
 405       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 406                                                          array->Size,
 407                                                          array->Format,
 408                                                          array->Normalized);
 409       assert(velements[attr].src_format);
 410    }
 411 }
 412
 413
 414 /**
 415  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 416  * vertex attribute.
 417  * \param vbuffer  returns vertex buffer info
 418  * \param velements  returns vertex element info
 419  */
 420 static void
 421 setup_non_interleaved_attribs(struct gl_context *ctx,
 422                               const struct st_vertex_program *vp,
 423                               const struct st_vp_variant *vpv,
 424                               const struct gl_client_array **arrays,
 425                               struct pipe_vertex_buffer vbuffer[],
 426                               struct pipe_vertex_element velements[],
 427                               unsigned max_index,
 428                               unsigned num_instances)
 429 {
 430    struct st_context *st = st_context(ctx);
 431    struct pipe_context *pipe = st->pipe;
 432    GLuint attr;
 433
 434    for (attr = 0; attr < vpv->num_inputs; attr++) {
 435       const GLuint mesaAttr = vp->index_to_input[attr];
 436       const struct gl_client_array *array = arrays[mesaAttr];
 437       struct gl_buffer_object *bufobj = array->BufferObj;
 438       GLuint element_size = array->_ElementSize;
 439       GLsizei stride = array->StrideB;
 440
 441       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 442
 443       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 444          /* Attribute data is in a VBO.
 445           * Recall that for VBOs, the gl_client_array->Ptr field is
 446           * really an offset from the start of the VBO, not a pointer.
 447           */
 448          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 449          assert(stobj->buffer);
 450
 451          vbuffer[attr].buffer = NULL;
 452          pipe_resource_reference(&vbuffer[attr].buffer, stobj->buffer);
 453          vbuffer[attr].buffer_offset = pointer_to_offset(array->Ptr);
 454       }
 455       else {
 456          /* wrap user data */
 457          uint bytes;
 458          void *ptr;
 459
 460          if (array->Ptr) {
 461             uint divisor = array->InstanceDivisor;
 462             uint last_index = divisor ? num_instances / divisor : max_index;
 463
 464             bytes = stride * last_index + element_size;
 465
 466             ptr = (void *) array->Ptr;
 467          }
 468          else {
 469             /* no array, use ctx->Current.Attrib[] value */
 470             bytes = element_size = sizeof(ctx->Current.Attrib[0]);
 471             ptr = (void *) ctx->Current.Attrib[mesaAttr];
 472             stride = 0;
 473          }
 474
 475          assert(ptr);
 476          assert(bytes);
 477
 478          vbuffer[attr].buffer =
 479             pipe_user_buffer_create(pipe->screen, ptr, bytes,
 480                                     PIPE_BIND_VERTEX_BUFFER);
 481
 482          vbuffer[attr].buffer_offset = 0;
 483
 484          /* Track user vertex buffers. */
 485          pipe_resource_reference(&st->user_attrib[attr].buffer, vbuffer[attr].buffer);
 486          st->user_attrib[attr].element_size = element_size;
 487          st->user_attrib[attr].stride = stride;
 488          st->num_user_attribs = MAX2(st->num_user_attribs, attr + 1);
 489       }
 490
 491       /* common-case setup */
 492       vbuffer[attr].stride = stride; /* in bytes */
 493
 494       velements[attr].src_offset = 0;
 495       velements[attr].instance_divisor = array->InstanceDivisor;
 496       velements[attr].vertex_buffer_index = attr;
 497       velements[attr].src_format = st_pipe_vertex_format(array->Type,
 498                                                          array->Size,
 499                                                          array->Format,
 500                                                          array->Normalized);
 501       assert(velements[attr].src_format);
 502    }
 503 }
 504
 505
 506 static void
 507 setup_index_buffer(struct gl_context *ctx,
 508                    const struct _mesa_index_buffer *ib,
 509                    struct pipe_index_buffer *ibuffer)
 510 {
 511    struct st_context *st = st_context(ctx);
 512    struct pipe_context *pipe = st->pipe;
 513
 514    memset(ibuffer, 0, sizeof(*ibuffer));
 515    if (ib) {
 516       struct gl_buffer_object *bufobj = ib->obj;
 517
 518       switch (ib->type) {
 519       case GL_UNSIGNED_INT:
 520          ibuffer->index_size = 4;
 521          break;
 522       case GL_UNSIGNED_SHORT:
 523          ibuffer->index_size = 2;
 524          break;
 525       case GL_UNSIGNED_BYTE:
 526          ibuffer->index_size = 1;
 527          break;
 528       default:
 529          assert(0);
 530          return;
 531       }
 532
 533       /* get/create the index buffer object */
 534       if (bufobj && _mesa_is_bufferobj(bufobj)) {
 535          /* elements/indexes are in a real VBO */
 536          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 537          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
 538          ibuffer->offset = pointer_to_offset(ib->ptr);
 539       }
 540       else {
 541          /* element/indicies are in user space memory */
 542          ibuffer->buffer =
 543             pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 544                                     ib->count * ibuffer->index_size,
 545                                     PIPE_BIND_INDEX_BUFFER);
 546       }
 547    }
 548 }
 549
 550
 551 /**
 552  * Prior to drawing, check that any uniforms referenced by the
 553  * current shader have been set.  If a uniform has not been set,
 554  * issue a warning.
 555  */
 556 static void
 557 check_uniforms(struct gl_context *ctx)
 558 {
 559    struct gl_shader_program *shProg[3] = {
 560       ctx->Shader.CurrentVertexProgram,
 561       ctx->Shader.CurrentGeometryProgram,
 562       ctx->Shader.CurrentFragmentProgram,
 563    };
 564    unsigned j;
 565
 566    for (j = 0; j < 3; j++) {
 567       unsigned i;
 568
 569       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 570          continue;
 571
 572       for (i = 0; i < shProg[j]->Uniforms->NumUniforms; i++) {
 573          const struct gl_uniform *u = &shProg[j]->Uniforms->Uniforms[i];
 574          if (!u->Initialized) {
 575             _mesa_warning(ctx,
 576                           "Using shader with uninitialized uniform: %s",
 577                           u->Name);
 578          }
 579       }
 580    }
 581 }
 582
 583
 584 /**
 585  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 586  * the corresponding Gallium type.
 587  */
 588 static unsigned
 589 translate_prim(const struct gl_context *ctx, unsigned prim)
 590 {
 591    /* GL prims should match Gallium prims, spot-check a few */
 592    assert(GL_POINTS == PIPE_PRIM_POINTS);
 593    assert(GL_QUADS == PIPE_PRIM_QUADS);
 594    assert(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 595
 596    /* Avoid quadstrips if it's easy to do so:
 597     * Note: it's important to do the correct trimming if we change the
 598     * prim type!  We do that wherever this function is called.
 599     */
 600    if (prim == GL_QUAD_STRIP &&
 601        ctx->Light.ShadeModel != GL_FLAT &&
 602        ctx->Polygon.FrontMode == GL_FILL &&
 603        ctx->Polygon.BackMode == GL_FILL)
 604       prim = GL_TRIANGLE_STRIP;
 605
 606    return prim;
 607 }
 608
 609
 610 static void
 611 st_validate_varrays(struct gl_context *ctx,
 612                     const struct gl_client_array **arrays,
 613                     unsigned max_index,
 614                     unsigned num_instances)
 615 {
 616    struct st_context *st = st_context(ctx);
 617    const struct st_vertex_program *vp;
 618    const struct st_vp_variant *vpv;
 619    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 620    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 621    unsigned num_vbuffers, num_velements;
 622    GLuint attr;
 623    unsigned i;
 624
 625    /* must get these after state validation! */
 626    vp = st->vp;
 627    vpv = st->vp_variant;
 628
 629    memset(velements, 0, sizeof(struct pipe_vertex_element) * vpv->num_inputs);
 630
 631    /* Unreference any user vertex buffers. */
 632    for (i = 0; i < st->num_user_attribs; i++) {
 633       pipe_resource_reference(&st->user_attrib[i].buffer, NULL);
 634    }
 635    st->num_user_attribs = 0;
 636
 637    /*
 638     * Setup the vbuffer[] and velements[] arrays.
 639     */
 640    if (is_interleaved_arrays(vp, vpv, arrays)) {
 641       setup_interleaved_attribs(ctx, vp, vpv, arrays, vbuffer, velements,
 642                                 max_index, num_instances);
 643
 644       num_vbuffers = 1;
 645       num_velements = vpv->num_inputs;
 646       if (num_velements == 0)
 647          num_vbuffers = 0;
 648    }
 649    else {
 650       setup_non_interleaved_attribs(ctx, vp, vpv, arrays,
 651                                     vbuffer, velements, max_index,
 652                                     num_instances);
 653       num_vbuffers = vpv->num_inputs;
 654       num_velements = vpv->num_inputs;
 655    }
 656
 657    cso_set_vertex_buffers(st->cso_context, num_vbuffers, vbuffer);
 658    cso_set_vertex_elements(st->cso_context, num_velements, velements);
 659
 660    /* unreference buffers (frees wrapped user-space buffer objects)
 661     * This is OK, because the pipe driver should reference buffers by itself
 662     * in set_vertex_buffers. */
 663    for (attr = 0; attr < num_vbuffers; attr++) {
 664       pipe_resource_reference(&vbuffer[attr].buffer, NULL);
 665       assert(!vbuffer[attr].buffer);
 666    }
 667 }
 668
 669
 670 /**
 671  * This function gets plugged into the VBO module and is called when
 672  * we have something to render.
 673  * Basically, translate the information into the format expected by gallium.
 674  */
 675 void
 676 st_draw_vbo(struct gl_context *ctx,
 677             const struct gl_client_array **arrays,
 678             const struct _mesa_prim *prims,
 679             GLuint nr_prims,
 680             const struct _mesa_index_buffer *ib,
 681             GLboolean index_bounds_valid,
 682             GLuint min_index,
 683             GLuint max_index)
 684 {
 685    struct st_context *st = st_context(ctx);
 686    struct pipe_context *pipe = st->pipe;
 687    struct pipe_index_buffer ibuffer;
 688    struct pipe_draw_info info;
 689    unsigned i, num_instances = 1;
 690    GLboolean new_array =
 691       st->dirty.st &&
 692       (st->dirty.mesa & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT)) != 0;
 693
 694    /* Mesa core state should have been validated already */
 695    assert(ctx->NewState == 0x0);
 696
 697    if (ib) {
 698       /* Gallium probably doesn't want this in some cases. */
 699       if (!index_bounds_valid)
 700          if (!all_varyings_in_vbos(arrays))
 701             vbo_get_minmax_index(ctx, prims, ib, &min_index, &max_index);
 702
 703       for (i = 0; i < nr_prims; i++) {
 704          num_instances = MAX2(num_instances, prims[i].num_instances);
 705       }
 706    }
 707    else {
 708       /* Get min/max index for non-indexed drawing. */
 709       min_index = ~0;
 710       max_index = 0;
 711
 712       for (i = 0; i < nr_prims; i++) {
 713          min_index = MIN2(min_index, prims[i].start);
 714          max_index = MAX2(max_index, prims[i].start + prims[i].count - 1);
 715          num_instances = MAX2(num_instances, prims[i].num_instances);
 716       }
 717    }
 718
 719    /* Validate state. */
 720    if (st->dirty.st) {
 721       GLboolean vertDataEdgeFlags;
 722
 723       /* sanity check for pointer arithmetic below */
 724       assert(sizeof(arrays[0]->Ptr[0]) == 1);
 725
 726       vertDataEdgeFlags = arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj &&
 727                           arrays[VERT_ATTRIB_EDGEFLAG]->BufferObj->Name;
 728       if (vertDataEdgeFlags != st->vertdata_edgeflags) {
 729          st->vertdata_edgeflags = vertDataEdgeFlags;
 730          st->dirty.st |= ST_NEW_EDGEFLAGS_DATA;
 731       }
 732
 733       st_validate_state(st);
 734
 735       if (new_array) {
 736          st_validate_varrays(ctx, arrays, max_index, num_instances);
 737       }
 738
 739 #if 0
 740       if (MESA_VERBOSE & VERBOSE_GLSL) {
 741          check_uniforms(ctx);
 742       }
 743 #else
 744       (void) check_uniforms;
 745 #endif
 746    }
 747
 748    /* Notify the driver that the content of user buffers may have been
 749     * changed. */
 750    assert(max_index >= min_index);
 751    if (!new_array && st->num_user_attribs) {
 752       for (i = 0; i < st->num_user_attribs; i++) {
 753          if (st->user_attrib[i].buffer) {
 754             unsigned element_size = st->user_attrib[i].element_size;
 755             unsigned stride = st->user_attrib[i].stride;
 756             unsigned min_offset = min_index * stride;
 757             unsigned max_offset = max_index * stride + element_size;
 758
 759             assert(max_offset > min_offset);
 760
 761             pipe->redefine_user_buffer(pipe, st->user_attrib[i].buffer,
 762                                        min_offset,
 763                                        max_offset - min_offset);
 764          }
 765       }
 766    }
 767
 768    setup_index_buffer(ctx, ib, &ibuffer);
 769    pipe->set_index_buffer(pipe, &ibuffer);
 770
 771    util_draw_init_info(&info);
 772    if (ib) {
 773       info.indexed = TRUE;
 774       if (min_index != ~0 && max_index != ~0) {
 775          info.min_index = min_index;
 776          info.max_index = max_index;
 777       }
 778    }
 779
 780    info.primitive_restart = ctx->Array.PrimitiveRestart;
 781    info.restart_index = ctx->Array.RestartIndex;
 782
 783    /* do actual drawing */
 784    for (i = 0; i < nr_prims; i++) {
 785       info.mode = translate_prim( ctx, prims[i].mode );
 786       info.start = prims[i].start;
 787       info.count = prims[i].count;
 788       info.instance_count = prims[i].num_instances;
 789       info.index_bias = prims[i].basevertex;
 790       if (!ib) {
 791          info.min_index = info.start;
 792          info.max_index = info.start + info.count - 1;
 793       }
 794
 795       if (u_trim_pipe_prim(info.mode, &info.count))
 796          pipe->draw_vbo(pipe, &info);
 797    }
 798
 799    pipe_resource_reference(&ibuffer.buffer, NULL);
 800 }
 801
 802
 803 void
 804 st_init_draw(struct st_context *st)
 805 {
 806    struct gl_context *ctx = st->ctx;
 807
 808    vbo_set_draw_func(ctx, st_draw_vbo);
 809
 810 #if FEATURE_feedback || FEATURE_rastpos
 811    st->draw = draw_create(st->pipe); /* for selection/feedback */
 812
 813    /* Disable draw options that might convert points/lines to tris, etc.
 814     * as that would foul-up feedback/selection mode.
 815     */
 816    draw_wide_line_threshold(st->draw, 1000.0f);
 817    draw_wide_point_threshold(st->draw, 1000.0f);
 818    draw_enable_line_stipple(st->draw, FALSE);
 819    draw_enable_point_sprites(st->draw, FALSE);
 820 #endif
 821 }
 822
 823
 824 void
 825 st_destroy_draw(struct st_context *st)
 826 {
 827 #if FEATURE_feedback || FEATURE_rastpos
 828    draw_destroy(st->draw);
 829 #endif
 830 }