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      1 /**************************************************************************
      2  *
      3  * Copyright 2007 VMware, Inc.
      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 VMWARE 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 /* Author:
     29  *    Brian Paul
     30  *    Keith Whitwell
     31  */
     32 
     33 
     34 #include "pipe/p_defines.h"
     35 #include "pipe/p_context.h"
     36 #include "util/u_draw.h"
     37 #include "util/u_prim.h"
     38 
     39 #include "lp_context.h"
     40 #include "lp_state.h"
     41 #include "lp_query.h"
     42 
     43 #include "draw/draw_context.h"
     44 
     45 
     46 
     47 /**
     48  * Draw vertex arrays, with optional indexing, optional instancing.
     49  * All the other drawing functions are implemented in terms of this function.
     50  * Basically, map the vertex buffers (and drawing surfaces), then hand off
     51  * the drawing to the 'draw' module.
     52  */
     53 static void
     54 llvmpipe_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
     55 {
     56    struct llvmpipe_context *lp = llvmpipe_context(pipe);
     57    struct draw_context *draw = lp->draw;
     58    const void *mapped_indices = NULL;
     59    unsigned i;
     60 
     61    if (!llvmpipe_check_render_cond(lp))
     62       return;
     63 
     64    if (info->indirect) {
     65       util_draw_indirect(pipe, info);
     66       return;
     67    }
     68 
     69    if (lp->dirty)
     70       llvmpipe_update_derived( lp );
     71 
     72    /*
     73     * Map vertex buffers
     74     */
     75    for (i = 0; i < lp->num_vertex_buffers; i++) {
     76       const void *buf = lp->vertex_buffer[i].user_buffer;
     77       size_t size = ~0;
     78       if (!buf) {
     79          if (!lp->vertex_buffer[i].buffer) {
     80             continue;
     81          }
     82          buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
     83          size = lp->vertex_buffer[i].buffer->width0;
     84       }
     85       draw_set_mapped_vertex_buffer(draw, i, buf, size);
     86    }
     87 
     88    /* Map index buffer, if present */
     89    if (info->indexed) {
     90       unsigned available_space = ~0;
     91       mapped_indices = lp->index_buffer.user_buffer;
     92       if (!mapped_indices) {
     93          mapped_indices = llvmpipe_resource_data(lp->index_buffer.buffer);
     94          if (lp->index_buffer.buffer->width0 > lp->index_buffer.offset)
     95             available_space =
     96                (lp->index_buffer.buffer->width0 - lp->index_buffer.offset);
     97          else
     98             available_space = 0;
     99       }
    100       draw_set_indexes(draw,
    101                        (ubyte *) mapped_indices + lp->index_buffer.offset,
    102                        lp->index_buffer.index_size, available_space);
    103    }
    104 
    105    for (i = 0; i < lp->num_so_targets; i++) {
    106       void *buf = 0;
    107       if (lp->so_targets[i]) {
    108          buf = llvmpipe_resource(lp->so_targets[i]->target.buffer)->data;
    109          lp->so_targets[i]->mapping = buf;
    110       }
    111    }
    112    draw_set_mapped_so_targets(draw, lp->num_so_targets,
    113                               lp->so_targets);
    114 
    115    llvmpipe_prepare_vertex_sampling(lp,
    116                                     lp->num_sampler_views[PIPE_SHADER_VERTEX],
    117                                     lp->sampler_views[PIPE_SHADER_VERTEX]);
    118    llvmpipe_prepare_geometry_sampling(lp,
    119                                       lp->num_sampler_views[PIPE_SHADER_GEOMETRY],
    120                                       lp->sampler_views[PIPE_SHADER_GEOMETRY]);
    121    if (lp->gs && lp->gs->no_tokens) {
    122       /* we have an empty geometry shader with stream output, so
    123          attach the stream output info to the current vertex shader */
    124       if (lp->vs) {
    125          draw_vs_attach_so(lp->vs, &lp->gs->stream_output);
    126       }
    127    }
    128    draw_collect_pipeline_statistics(draw,
    129                                     lp->active_statistics_queries > 0);
    130 
    131    /* draw! */
    132    draw_vbo(draw, info);
    133 
    134    /*
    135     * unmap vertex/index buffers
    136     */
    137    for (i = 0; i < lp->num_vertex_buffers; i++) {
    138       draw_set_mapped_vertex_buffer(draw, i, NULL, 0);
    139    }
    140    if (mapped_indices) {
    141       draw_set_indexes(draw, NULL, 0, 0);
    142    }
    143    draw_set_mapped_so_targets(draw, 0, NULL);
    144 
    145    if (lp->gs && lp->gs->no_tokens) {
    146       /* we have attached stream output to the vs for rendering,
    147          now lets reset it */
    148       if (lp->vs) {
    149          draw_vs_reset_so(lp->vs);
    150       }
    151    }
    152 
    153    /*
    154     * TODO: Flush only when a user vertex/index buffer is present
    155     * (or even better, modify draw module to do this
    156     * internally when this condition is seen?)
    157     */
    158    draw_flush(draw);
    159 }
    160 
    161 
    162 void
    163 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
    164 {
    165    llvmpipe->pipe.draw_vbo = llvmpipe_draw_vbo;
    166 }
    167