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