1/*
2 * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 *    Rob Clark <robclark@freedesktop.org>
25 */
26
27/**
28 * This module converts provides a more convenient front-end to u_indices,
29 * etc, utils to convert primitive types supported not supported by the
30 * hardware.  It handles binding new index buffer state, and restoring
31 * previous state after.  To use, put something like this at the front of
32 * drivers pipe->draw_vbo():
33 *
34 *    // emulate unsupported primitives:
35 *    if (info->mode needs emulating) {
36 *       util_primconvert_save_rasterizer_state(ctx->primconvert, ctx->rasterizer);
37 *       util_primconvert_draw_vbo(ctx->primconvert, info);
38 *       return;
39 *    }
40 *
41 */
42
43#include "pipe/p_state.h"
44#include "util/u_draw.h"
45#include "util/u_inlines.h"
46#include "util/u_memory.h"
47#include "util/u_upload_mgr.h"
48
49#include "indices/u_indices.h"
50#include "indices/u_primconvert.h"
51
52struct primconvert_context
53{
54   struct pipe_context *pipe;
55   uint32_t primtypes_mask;
56   unsigned api_pv;
57};
58
59
60struct primconvert_context *
61util_primconvert_create(struct pipe_context *pipe, uint32_t primtypes_mask)
62{
63   struct primconvert_context *pc = CALLOC_STRUCT(primconvert_context);
64   if (!pc)
65      return NULL;
66   pc->pipe = pipe;
67   pc->primtypes_mask = primtypes_mask;
68   return pc;
69}
70
71void
72util_primconvert_destroy(struct primconvert_context *pc)
73{
74   FREE(pc);
75}
76
77void
78util_primconvert_save_rasterizer_state(struct primconvert_context *pc,
79                                       const struct pipe_rasterizer_state
80                                       *rast)
81{
82   /* if we actually translated the provoking vertex for the buffer,
83    * we would actually need to save/restore rasterizer state.  As
84    * it is, we just need to make note of the pv.
85    */
86   pc->api_pv = rast->flatshade_first ? PV_FIRST : PV_LAST;
87}
88
89void
90util_primconvert_draw_vbo(struct primconvert_context *pc,
91                          const struct pipe_draw_info *info)
92{
93   struct pipe_draw_info new_info;
94   struct pipe_transfer *src_transfer = NULL;
95   u_translate_func trans_func;
96   u_generate_func gen_func;
97   const void *src = NULL;
98   void *dst;
99   unsigned ib_offset;
100
101   util_draw_init_info(&new_info);
102   new_info.min_index = info->min_index;
103   new_info.max_index = info->max_index;
104   new_info.index_bias = info->index_bias;
105   new_info.start_instance = info->start_instance;
106   new_info.instance_count = info->instance_count;
107   new_info.primitive_restart = info->primitive_restart;
108   new_info.restart_index = info->restart_index;
109   if (info->index_size) {
110      enum pipe_prim_type mode = 0;
111      unsigned index_size;
112
113      u_index_translator(pc->primtypes_mask,
114                         info->mode, info->index_size, info->count,
115                         pc->api_pv, pc->api_pv,
116                         info->primitive_restart ? PR_ENABLE : PR_DISABLE,
117                         &mode, &index_size, &new_info.count,
118                         &trans_func);
119      new_info.mode = mode;
120      new_info.index_size = index_size;
121      src = info->has_user_indices ? info->index.user : NULL;
122      if (!src) {
123         src = pipe_buffer_map(pc->pipe, info->index.resource,
124                               PIPE_TRANSFER_READ, &src_transfer);
125      }
126      src = (const uint8_t *)src;
127   }
128   else {
129      enum pipe_prim_type mode = 0;
130      unsigned index_size;
131
132      u_index_generator(pc->primtypes_mask,
133                        info->mode, info->start, info->count,
134                        pc->api_pv, pc->api_pv,
135                        &mode, &index_size, &new_info.count,
136                        &gen_func);
137      new_info.mode = mode;
138      new_info.index_size = index_size;
139   }
140
141   u_upload_alloc(pc->pipe->stream_uploader, 0, new_info.index_size * new_info.count, 4,
142                  &ib_offset, &new_info.index.resource, &dst);
143   new_info.start = ib_offset / new_info.index_size;
144
145   if (info->index_size) {
146      trans_func(src, info->start, info->count, new_info.count, info->restart_index, dst);
147   }
148   else {
149      gen_func(info->start, new_info.count, dst);
150   }
151
152   if (src_transfer)
153      pipe_buffer_unmap(pc->pipe, src_transfer);
154
155   u_upload_unmap(pc->pipe->stream_uploader);
156
157   /* to the translated draw: */
158   pc->pipe->draw_vbo(pc->pipe, &new_info);
159
160   pipe_resource_reference(&new_info.index.resource, NULL);
161}
162