src/gallium/drivers/r300/r300_render_translate.c

   1 /*
   2  * Copyright 2010 Marek Olšák <maraeo@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22
  23 /**
  24  * The functions below translate vertex buffers to the layout compatible
  25  * with the hardware, so that all vertex fetches are be DWORD-aligned and all
  26  * used vertex formats are supported.
  27  */
  28
  29 #include "r300_context.h"
  30 #include "translate/translate.h"
  31
  32 void r300_begin_vertex_translate(struct r300_context *r300)
  33 {
  34     struct pipe_context *pipe = &r300->context;
  35     struct translate_key key = {0};
  36     struct translate_element *te;
  37     unsigned tr_elem_index[PIPE_MAX_ATTRIBS] = {0};
  38     struct translate *tr;
  39     struct r300_vertex_element_state *ve = r300->velems;
  40     boolean vb_translated[PIPE_MAX_ATTRIBS] = {0};
  41     void *vb_map[PIPE_MAX_ATTRIBS] = {0}, *out_map;
  42     struct pipe_transfer *vb_transfer[PIPE_MAX_ATTRIBS] = {0}, *out_transfer;
  43     struct pipe_resource *out_buffer;
  44     unsigned i, num_verts;
  45
  46     /* Initialize the translate key, i.e. the recipe how vertices should be
  47      * translated. */
  48     for (i = 0; i < ve->count; i++) {
  49         struct pipe_vertex_buffer *vb =
  50                 &r300->vertex_buffer[ve->velem[i].vertex_buffer_index];
  51
  52         /* Check for support. */
  53         if (ve->velem[i].src_format == ve->hw_format[i] &&
  54             (vb->buffer_offset + ve->velem[i].src_offset) % 4 == 0 &&
  55             vb->stride % 4 == 0) {
  56             continue;
  57         }
  58
  59         /* Add this vertex element. */
  60         te = &key.element[key.nr_elements];
  61         /*te->type;
  62         te->instance_divisor;*/
  63         te->input_buffer = ve->velem[i].vertex_buffer_index;
  64         te->input_format = ve->velem[i].src_format;
  65         te->input_offset = vb->buffer_offset + ve->velem[i].src_offset;
  66         te->output_format = ve->hw_format[i];
  67         te->output_offset = key.output_stride;
  68
  69         key.output_stride += ve->hw_format_size[i];
  70         vb_translated[ve->velem[i].vertex_buffer_index] = TRUE;
  71         tr_elem_index[i] = key.nr_elements;
  72         key.nr_elements++;
  73     }
  74
  75     /* Get a translate object. */
  76     tr = translate_cache_find(r300->tran.translate_cache, &key);
  77
  78     /* Map buffers we want to translate. */
  79     for (i = 0; i < r300->vertex_buffer_count; i++) {
  80         if (vb_translated[i]) {
  81             struct pipe_vertex_buffer *vb = &r300->vertex_buffer[i];
  82
  83             vb_map[i] = pipe_buffer_map(pipe, vb->buffer,
  84                                         PIPE_TRANSFER_READ, &vb_transfer[i]);
  85
  86             tr->set_buffer(tr, i, vb_map[i], vb->stride, vb->max_index);
  87         }
  88     }
  89
  90     /* Create and map the output buffer. */
  91     num_verts = r300->vertex_buffer_max_index + 1;
  92
  93     out_buffer = pipe_buffer_create(&r300->screen->screen,
  94                                     PIPE_BIND_VERTEX_BUFFER,
  95                                     key.output_stride * num_verts);
  96
  97     out_map = pipe_buffer_map(pipe, out_buffer, PIPE_TRANSFER_WRITE,
  98                               &out_transfer);
  99
 100     /* Translate. */
 101     tr->run(tr, 0, num_verts, 0, out_map);
 102
 103     /* Unmap all buffers. */
 104     for (i = 0; i < r300->vertex_buffer_count; i++) {
 105         if (vb_translated[i]) {
 106             pipe_buffer_unmap(pipe, r300->vertex_buffer[i].buffer,
 107                               vb_transfer[i]);
 108         }
 109     }
 110
 111     pipe_buffer_unmap(pipe, out_buffer, out_transfer);
 112
 113     /* Setup the new vertex buffer in the first free slot. */
 114     for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 115         struct pipe_vertex_buffer *vb = &r300->vertex_buffer[i];
 116
 117         if (!vb->buffer) {
 118             pipe_resource_reference(&vb->buffer, out_buffer);
 119             vb->buffer_offset = 0;
 120             vb->max_index = num_verts - 1;
 121             vb->stride = key.output_stride;
 122             r300->tran.vb_slot = i;
 123             break;
 124         }
 125     }
 126
 127     /* Save and replace vertex elements. */
 128     {
 129         struct pipe_vertex_element new_velems[PIPE_MAX_ATTRIBS];
 130
 131         r300->tran.saved_velems = r300->velems;
 132
 133         for (i = 0; i < ve->count; i++) {
 134             if (vb_translated[ve->velem[i].vertex_buffer_index]) {
 135                 te = &key.element[tr_elem_index[i]];
 136                 new_velems[i].instance_divisor = ve->velem[i].instance_divisor;
 137                 new_velems[i].src_format = te->output_format;
 138                 new_velems[i].src_offset = te->output_offset;
 139                 new_velems[i].vertex_buffer_index = r300->tran.vb_slot;
 140             } else {
 141                 memcpy(&new_velems[i], &ve->velem[i],
 142                        sizeof(struct pipe_vertex_element));
 143             }
 144         }
 145
 146         r300->tran.new_velems =
 147             pipe->create_vertex_elements_state(pipe, ve->count, new_velems);
 148         pipe->bind_vertex_elements_state(pipe, r300->tran.new_velems);
 149     }
 150
 151     pipe_resource_reference(&out_buffer, NULL);
 152 }
 153
 154 void r300_end_vertex_translate(struct r300_context *r300)
 155 {
 156     struct pipe_context *pipe = &r300->context;
 157
 158     /* Restore vertex elements. */
 159     pipe->bind_vertex_elements_state(pipe, r300->tran.saved_velems);
 160     pipe->delete_vertex_elements_state(pipe, r300->tran.new_velems);
 161
 162     /* Delete the now-unused VBO. */
 163     pipe_resource_reference(&r300->vertex_buffer[r300->tran.vb_slot].buffer,
 164                             NULL);
 165 }