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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35
  36 #include "vbo/vbo.h"
  37 #include "vbo/vbo_context.h"
  38
  39 #include "st_atom.h"
  40 #include "st_cache.h"
  41 #include "st_context.h"
  42 #include "st_cb_bufferobjects.h"
  43 #include "st_draw.h"
  44 #include "st_program.h"
  45
  46 #include "pipe/p_context.h"
  47 #include "pipe/p_defines.h"
  48 #include "pipe/p_winsys.h"
  49
  50 #include "pipe/draw/draw_private.h"
  51 #include "pipe/draw/draw_context.h"
  52
  53
  54 /**
  55  * Return a PIPE_FORMAT_x for the given GL datatype and size.
  56  */
  57 static GLuint
  58 pipe_vertex_format(GLenum type, GLuint size)
  59 {
  60    static const GLuint float_fmts[4] = {
  61       PIPE_FORMAT_R32_FLOAT,
  62       PIPE_FORMAT_R32G32_FLOAT,
  63       PIPE_FORMAT_R32G32B32_FLOAT,
  64       PIPE_FORMAT_R32G32B32A32_FLOAT,
  65    };
  66    static const GLuint int_fmts[4] = {
  67       PIPE_FORMAT_R32_SSCALED,
  68       PIPE_FORMAT_R32G32_SSCALED,
  69       PIPE_FORMAT_R32G32B32_SSCALED,
  70       PIPE_FORMAT_R32G32B32A32_SSCALED,
  71    };
  72
  73    assert(type >= GL_BYTE);
  74    assert(type <= GL_DOUBLE);
  75    assert(size >= 1);
  76    assert(size <= 4);
  77
  78    switch (type) {
  79    case GL_FLOAT:
  80       return float_fmts[size - 1];
  81    case GL_INT:
  82       return int_fmts[size - 1];
  83    default:
  84       assert(0);
  85    }
  86    return 0; /* silence compiler warning */
  87 }
  88
  89
  90 /**
  91  * The default attribute buffer is basically a copy of the
  92  * ctx->Current.Attrib[] array.  It's used when the vertex program
  93  * references an attribute for which we don't have a VBO/array.
  94  */
  95 static void
  96 create_default_attribs_buffer(struct st_context *st)
  97 {
  98    struct pipe_context *pipe = st->pipe;
  99    st->default_attrib_buffer = pipe->winsys->buffer_create( pipe->winsys, 32 );
 100 }
 101
 102
 103 static void
 104 destroy_default_attribs_buffer(struct st_context *st)
 105 {
 106    struct pipe_context *pipe = st->pipe;
 107    pipe->winsys->buffer_reference(pipe->winsys,
 108                                   &st->default_attrib_buffer, NULL);
 109 }
 110
 111
 112 /**
 113  * This function gets plugged into the VBO module and is called when
 114  * we have something to render.
 115  * Basically, translate the information into the format expected by pipe.
 116  */
 117 void
 118 st_draw_vbo(GLcontext *ctx,
 119             const struct gl_client_array **arrays,
 120             const struct _mesa_prim *prims,
 121             GLuint nr_prims,
 122             const struct _mesa_index_buffer *ib,
 123             GLuint min_index,
 124             GLuint max_index)
 125 {
 126    struct pipe_context *pipe = ctx->st->pipe;
 127    struct pipe_winsys *winsys = pipe->winsys;
 128    const struct st_vertex_program *vp;
 129    const struct pipe_shader_state *vs;
 130    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 131    GLuint attr;
 132
 133    /* sanity check for pointer arithmetic below */
 134    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 135
 136    st_validate_state(ctx->st);
 137
 138    /* must get these after state validation! */
 139    vp = ctx->st->vp;
 140    vs = &ctx->st->state.vs->state;
 141
 142    /* loop over TGSI shader inputs to determine vertex buffer
 143     * and attribute info
 144     */
 145    for (attr = 0; attr < vs->num_inputs; attr++) {
 146       const GLuint mesaAttr = vp->index_to_input[attr];
 147       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 148       struct pipe_vertex_element velement;
 149
 150       if (bufobj && bufobj->Name) {
 151          /* Attribute data is in a VBO.
 152           * Recall that for VBOs, the gl_client_array->Ptr field is
 153           * really an offset from the start of the VBO, not a pointer.
 154           */
 155          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 156          assert(stobj->buffer);
 157
 158          vbuffer[attr].buffer = NULL;
 159          winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 160          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 161          velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 162          assert(velement.src_offset <= 2048); /* 11-bit field */
 163       }
 164       else {
 165          /* attribute data is in user-space memory, not a VBO */
 166          uint bytes = (arrays[mesaAttr]->Size
 167                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 168                        * (max_index + 1));
 169
 170          /* wrap user data */
 171          vbuffer[attr].buffer
 172             = winsys->user_buffer_create(winsys,
 173                                          (void *) arrays[mesaAttr]->Ptr,
 174                                          bytes);
 175          vbuffer[attr].buffer_offset = 0;
 176          velement.src_offset = 0;
 177       }
 178
 179       /* common-case setup */
 180       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 181       vbuffer[attr].max_index = 0;  /* need this? */
 182       velement.vertex_buffer_index = attr;
 183       velement.dst_offset = 0; /* need this? */
 184       velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 185                                                arrays[mesaAttr]->Size);
 186       assert(velement.src_format);
 187
 188       /* tell pipe about this attribute */
 189       pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
 190       pipe->set_vertex_element(pipe, attr, &velement);
 191    }
 192
 193
 194    /* do actual drawing */
 195    if (ib) {
 196       /* indexed primitive */
 197       struct gl_buffer_object *bufobj = ib->obj;
 198       struct pipe_buffer_handle *indexBuf = NULL;
 199       unsigned indexSize, indexOffset, i;
 200
 201       switch (ib->type) {
 202       case GL_UNSIGNED_INT:
 203          indexSize = 4;
 204          break;
 205       case GL_UNSIGNED_SHORT:
 206          indexSize = 2;
 207          break;
 208       case GL_UNSIGNED_BYTE:
 209          indexSize = 1;
 210          break;
 211       default:
 212          assert(0);
 213       }
 214
 215       /* get/create the index buffer object */
 216       if (bufobj && bufobj->Name) {
 217          /* elements/indexes are in a real VBO */
 218          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 219          winsys->buffer_reference(winsys, &indexBuf, stobj->buffer);
 220          indexOffset = (unsigned) ib->ptr / indexSize;
 221       }
 222       else {
 223          /* element/indicies are in user space memory */
 224          indexBuf = winsys->user_buffer_create(winsys,
 225                                                (void *) ib->ptr,
 226                                                ib->count * indexSize);
 227          indexOffset = 0;
 228       }
 229
 230       /* draw */
 231       for (i = 0; i < nr_prims; i++) {
 232          pipe->draw_elements(pipe, indexBuf, indexSize,
 233                              prims[i].mode,
 234                              prims[i].start + indexOffset, prims[i].count);
 235       }
 236
 237       winsys->buffer_reference(winsys, &indexBuf, NULL);
 238    }
 239    else {
 240       /* non-indexed */
 241       GLuint i;
 242       for (i = 0; i < nr_prims; i++) {
 243          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 244       }
 245    }
 246
 247    /* unreference buffers (frees wrapped user-space buffer objects) */
 248    for (attr = 0; attr < vs->num_inputs; attr++) {
 249       winsys->buffer_reference(winsys, &vbuffer[attr].buffer, NULL);
 250       assert(!vbuffer[attr].buffer);
 251       pipe->set_vertex_buffer(pipe, attr, &vbuffer[attr]);
 252    }
 253 }
 254
 255
 256
 257 /**
 258  * Utility function for drawing simple primitives (such as quads for
 259  * glClear and glDrawPixels).  Coordinates are in screen space.
 260  * \param mode  one of PIPE_PRIM_x
 261  * \param numVertex  number of vertices
 262  * \param verts  vertex data (all attributes are float[4])
 263  * \param numAttribs  number of attributes per vertex
 264  */
 265 void
 266 st_draw_vertices(GLcontext *ctx, unsigned prim,
 267                  unsigned numVertex, float *verts,
 268                  unsigned numAttribs)
 269 {
 270    const float width = ctx->DrawBuffer->Width;
 271    const float height = ctx->DrawBuffer->Height;
 272    const unsigned vertex_bytes = numVertex * numAttribs * 4 * sizeof(float);
 273    struct pipe_context *pipe = ctx->st->pipe;
 274    struct pipe_buffer_handle *vbuf;
 275    struct pipe_vertex_buffer vbuffer;
 276    struct pipe_vertex_element velement;
 277    unsigned i;
 278
 279    assert(numAttribs > 0);
 280
 281    /* convert to clip coords */
 282    for (i = 0; i < numVertex; i++) {
 283       float x = verts[i * numAttribs * 4 + 0];
 284       float y = verts[i * numAttribs * 4 + 1];
 285       x = x / width * 2.0 - 1.0;
 286       y = y / height * 2.0 - 1.0;
 287       verts[i * numAttribs * 4 + 0] = x;
 288       verts[i * numAttribs * 4 + 1] = y;
 289    }
 290
 291    /* XXX create one-time */
 292    vbuf = pipe->winsys->buffer_create(pipe->winsys, 32);
 293    pipe->winsys->buffer_data(pipe->winsys, vbuf,
 294                              vertex_bytes, verts,
 295                              PIPE_BUFFER_USAGE_VERTEX);
 296
 297    /* tell pipe about the vertex buffer */
 298    vbuffer.buffer = vbuf;
 299    vbuffer.pitch = numAttribs * 4 * sizeof(float);  /* vertex size */
 300    vbuffer.buffer_offset = 0;
 301    pipe->set_vertex_buffer(pipe, 0, &vbuffer);
 302
 303    /* tell pipe about the vertex attributes */
 304    for (i = 0; i < numAttribs; i++) {
 305       velement.src_offset = i * 4 * sizeof(GLfloat);
 306       velement.vertex_buffer_index = 0;
 307       velement.src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 308       velement.dst_offset = 0;
 309       pipe->set_vertex_element(pipe, i, &velement);
 310    }
 311
 312    /* draw */
 313    pipe->draw_arrays(pipe, prim, 0, numVertex);
 314
 315    /* XXX: do one-time */
 316    pipe->winsys->buffer_reference(pipe->winsys, &vbuf, NULL);
 317 }
 318
 319
 320 /**
 321  * Set the (private) draw module's post-transformed vertex format when in
 322  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 323  */
 324 static void
 325 set_feedback_vertex_format(GLcontext *ctx)
 326 {
 327    struct st_context *st = ctx->st;
 328    struct vertex_info vinfo;
 329    GLuint i;
 330
 331    if (ctx->RenderMode == GL_SELECT) {
 332       assert(ctx->RenderMode == GL_SELECT);
 333       vinfo.num_attribs = 1;
 334       vinfo.format[0] = FORMAT_4F;
 335       vinfo.interp_mode[0] = INTERP_NONE;
 336    }
 337    else {
 338       /* GL_FEEDBACK, or glRasterPos */
 339       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 340       vinfo.num_attribs = st->state.vs->state.num_outputs;
 341       for (i = 0; i < vinfo.num_attribs; i++) {
 342          vinfo.format[i] = FORMAT_4F;
 343          vinfo.interp_mode[i] = INTERP_LINEAR;
 344       }
 345    }
 346
 347    draw_set_vertex_info(st->draw, &vinfo);
 348 }
 349
 350
 351 /**
 352  * Called by VBO to draw arrays when in selection or feedback mode and
 353  * to implement glRasterPos.
 354  * This is very much like the normal draw_vbo() function above.
 355  * Look at code refactoring some day.
 356  * Might move this into the failover module some day.
 357  */
 358 void
 359 st_feedback_draw_vbo(GLcontext *ctx,
 360                      const struct gl_client_array **arrays,
 361                      const struct _mesa_prim *prims,
 362                      GLuint nr_prims,
 363                      const struct _mesa_index_buffer *ib,
 364                      GLuint min_index,
 365                      GLuint max_index)
 366 {
 367    struct st_context *st = ctx->st;
 368    struct pipe_context *pipe = st->pipe;
 369    struct draw_context *draw = st->draw;
 370    struct pipe_winsys *winsys = pipe->winsys;
 371    const struct st_vertex_program *vp;
 372    const struct pipe_shader_state *vs;
 373    struct pipe_buffer_handle *index_buffer_handle = 0;
 374    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 375    GLuint attr, i;
 376    ubyte *mapped_constants;
 377
 378    assert(draw);
 379
 380    st_validate_state(ctx->st);
 381
 382    /* must get these after state validation! */
 383    vp = ctx->st->vp;
 384    vs = &ctx->st->state.vs->state;
 385
 386    /*
 387     * Set up the draw module's state.
 388     *
 389     * We'd like to do this less frequently, but the normal state-update
 390     * code sends state updates to the pipe, not to our private draw module.
 391     */
 392    assert(draw);
 393    draw_set_viewport_state(draw, &st->state.viewport);
 394    draw_set_clip_state(draw, &st->state.clip);
 395    draw_set_rasterizer_state(draw, &st->state.rasterizer->state);
 396    draw_bind_vertex_shader(draw, st->state.vs->data);
 397    set_feedback_vertex_format(ctx);
 398
 399    /* loop over TGSI shader inputs to determine vertex buffer
 400     * and attribute info
 401     */
 402    for (attr = 0; attr < vs->num_inputs; attr++) {
 403       const GLuint mesaAttr = vp->index_to_input[attr];
 404       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 405       struct pipe_vertex_element velement;
 406       void *map;
 407
 408       if (bufobj && bufobj->Name) {
 409          /* Attribute data is in a VBO.
 410           * Recall that for VBOs, the gl_client_array->Ptr field is
 411           * really an offset from the start of the VBO, not a pointer.
 412           */
 413          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 414          assert(stobj->buffer);
 415
 416          vbuffer[attr].buffer = NULL;
 417          winsys->buffer_reference(winsys, &vbuffer[attr].buffer, stobj->buffer);
 418          vbuffer[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 419          velement.src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 420       }
 421       else {
 422          /* attribute data is in user-space memory, not a VBO */
 423          uint bytes = (arrays[mesaAttr]->Size
 424                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 425                        * (max_index + 1));
 426
 427          /* wrap user data */
 428          vbuffer[attr].buffer
 429             = winsys->user_buffer_create(winsys,
 430                                          (void *) arrays[mesaAttr]->Ptr,
 431                                          bytes);
 432          vbuffer[attr].buffer_offset = 0;
 433          velement.src_offset = 0;
 434       }
 435
 436       /* common-case setup */
 437       vbuffer[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 438       vbuffer[attr].max_index = 0;  /* need this? */
 439       velement.vertex_buffer_index = attr;
 440       velement.dst_offset = 0; /* need this? */
 441       velement.src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 442                                                arrays[mesaAttr]->Size);
 443       assert(velement.src_format);
 444
 445       /* tell draw about this attribute */
 446       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 447       draw_set_vertex_element(draw, attr, &velement);
 448
 449       /* map the attrib buffer */
 450       map = pipe->winsys->buffer_map(pipe->winsys,
 451                                      vbuffer[attr].buffer,
 452                                      PIPE_BUFFER_FLAG_READ);
 453       draw_set_mapped_vertex_buffer(draw, attr, map);
 454    }
 455
 456    if (ib) {
 457       unsigned indexSize;
 458       struct gl_buffer_object *bufobj = ib->obj;
 459       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 460       index_buffer_handle = stobj->buffer;
 461       void *map;
 462
 463       switch (ib->type) {
 464       case GL_UNSIGNED_INT:
 465          indexSize = 4;
 466          break;
 467       case GL_UNSIGNED_SHORT:
 468          indexSize = 2;
 469          break;
 470       default:
 471          assert(0);
 472       }
 473
 474       map = pipe->winsys->buffer_map(pipe->winsys,
 475                                      index_buffer_handle,
 476                                      PIPE_BUFFER_FLAG_READ);
 477       draw_set_mapped_element_buffer(draw, indexSize, map);
 478    }
 479    else {
 480       /* no index/element buffer */
 481       draw_set_mapped_element_buffer(draw, 0, NULL);
 482    }
 483
 484
 485    /* map constant buffers */
 486    mapped_constants = winsys->buffer_map(winsys,
 487                                st->state.constants[PIPE_SHADER_VERTEX].buffer,
 488                                PIPE_BUFFER_FLAG_READ);
 489    draw_set_mapped_constant_buffer(st->draw, mapped_constants);
 490
 491
 492    /* draw here */
 493    for (i = 0; i < nr_prims; i++) {
 494       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 495    }
 496
 497
 498    /* unmap constant buffers */
 499    winsys->buffer_unmap(winsys, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 500
 501    /*
 502     * unmap vertex/index buffers
 503     */
 504    for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
 505       if (draw->vertex_buffer[i].buffer) {
 506          pipe->winsys->buffer_unmap(pipe->winsys,
 507                                     draw->vertex_buffer[i].buffer);
 508          draw_set_mapped_vertex_buffer(draw, i, NULL);
 509       }
 510    }
 511    if (ib) {
 512       pipe->winsys->buffer_unmap(pipe->winsys, index_buffer_handle);
 513       draw_set_mapped_element_buffer(draw, 0, NULL);
 514    }
 515 }
 516
 517
 518
 519 void st_init_draw( struct st_context *st )
 520 {
 521    GLcontext *ctx = st->ctx;
 522    struct vbo_context *vbo = (struct vbo_context *) ctx->swtnl_im;
 523
 524    /* actually, not used here, but elsewhere */
 525    create_default_attribs_buffer(st);
 526
 527    assert(vbo);
 528    assert(vbo->draw_prims);
 529    vbo->draw_prims = st_draw_vbo;
 530 }
 531
 532
 533 void st_destroy_draw( struct st_context *st )
 534 {
 535    destroy_default_attribs_buffer(st);
 536 }
 537
 538