1/**********************************************************
2 * Copyright 2008-2009 VMware, Inc.  All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
7 * restriction, including without limitation the rights to use, copy,
8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 *
24 **********************************************************/
25
26#ifndef SVGA_DRAW_H_
27#define SVGA_DRAW_H_
28
29#include "pipe/p_compiler.h"
30#include "pipe/p_defines.h"
31#include "indices/u_indices.h"
32#include "util/u_prim.h"
33#include "svga_context.h"
34#include "svga_hw_reg.h"
35#include "svga3d_shaderdefs.h"
36
37struct svga_context;
38struct u_upload_mgr;
39
40/**
41 * Mask indicating which types of gallium primitives are actually
42 * handled by the svga device.  Other types will be converted to
43 * these types by the index/translation code.
44 */
45static const unsigned svga_hw_prims =
46   ((1 << PIPE_PRIM_POINTS) |
47    (1 << PIPE_PRIM_LINES) |
48    (1 << PIPE_PRIM_LINE_STRIP) |
49    (1 << PIPE_PRIM_TRIANGLES) |
50    (1 << PIPE_PRIM_TRIANGLE_STRIP) |
51    (1 << PIPE_PRIM_TRIANGLE_FAN) |
52    (1 << PIPE_PRIM_LINES_ADJACENCY) |
53    (1 << PIPE_PRIM_LINE_STRIP_ADJACENCY) |
54    (1 << PIPE_PRIM_TRIANGLES_ADJACENCY) |
55    (1 << PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY) |
56    (1 << PIPE_PRIM_PATCHES));
57
58
59/**
60 * Translate a gallium PIPE_PRIM_x value to an SVGA3D_PRIMITIVE_x value.
61 * Also, compute the number of primitives that'll be drawn given a
62 * vertex count.
63 * Note that this function doesn't have to handle PIPE_PRIM_LINE_LOOP,
64 * PIPE_PRIM_QUADS, PIPE_PRIM_QUAD_STRIP or PIPE_PRIM_POLYGON.  We convert
65 * those to other types of primitives with index/translation code.
66 */
67static inline SVGA3dPrimitiveType
68svga_translate_prim(unsigned mode, unsigned vcount, unsigned *prim_count,
69                    ubyte vertices_per_patch)
70{
71   switch (mode) {
72   case PIPE_PRIM_POINTS:
73      *prim_count = vcount;
74      return SVGA3D_PRIMITIVE_POINTLIST;
75
76   case PIPE_PRIM_LINES:
77      *prim_count = vcount / 2;
78      return SVGA3D_PRIMITIVE_LINELIST;
79
80   case PIPE_PRIM_LINE_STRIP:
81      *prim_count = vcount - 1;
82      return SVGA3D_PRIMITIVE_LINESTRIP;
83
84   case PIPE_PRIM_TRIANGLES:
85      *prim_count = vcount / 3;
86      return SVGA3D_PRIMITIVE_TRIANGLELIST;
87
88   case PIPE_PRIM_TRIANGLE_STRIP:
89      *prim_count = vcount - 2;
90      return SVGA3D_PRIMITIVE_TRIANGLESTRIP;
91
92   case PIPE_PRIM_TRIANGLE_FAN:
93      *prim_count = vcount - 2;
94      return SVGA3D_PRIMITIVE_TRIANGLEFAN;
95
96   case PIPE_PRIM_LINES_ADJACENCY:
97      *prim_count = vcount / 4;
98      return SVGA3D_PRIMITIVE_LINELIST_ADJ;
99
100   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
101      *prim_count = vcount - 3;
102      return SVGA3D_PRIMITIVE_LINESTRIP_ADJ;
103
104   case PIPE_PRIM_TRIANGLES_ADJACENCY:
105      *prim_count = vcount / 6;
106      return SVGA3D_PRIMITIVE_TRIANGLELIST_ADJ;
107
108   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
109      *prim_count = vcount / 2 - 2 ;
110      return SVGA3D_PRIMITIVE_TRIANGLESTRIP_ADJ;
111
112   case PIPE_PRIM_PATCHES:
113      *prim_count = vcount / vertices_per_patch ;
114      assert(vertices_per_patch >= 1);
115      assert(vertices_per_patch <= 32);
116      return (SVGA3D_PRIMITIVE_1_CONTROL_POINT_PATCH - 1)
117             + vertices_per_patch;
118
119   default:
120      assert(0);
121      *prim_count = 0;
122      return 0;
123   }
124}
125
126
127struct index_cache {
128   u_generate_func generate;
129   unsigned gen_nr;
130
131   /* If non-null, this buffer is filled by calling generate(nr, map(buffer))
132    */
133   struct pipe_resource *buffer;
134};
135
136
137/** Max number of primitives per draw call */
138#define QSZ SVGA3D_MAX_DRAW_PRIMITIVE_RANGES
139
140struct draw_cmd {
141   struct svga_winsys_context *swc;
142
143   /* vertex layout info */
144   SVGA3dVertexDecl vdecl[SVGA3D_INPUTREG_MAX];
145   unsigned vdecl_count;
146   SVGA3dElementLayoutId vdecl_layout_id;
147   unsigned vdecl_buffer_index[SVGA3D_INPUTREG_MAX];
148
149   /* vertex buffer info */
150   struct pipe_vertex_buffer vbufs[SVGA3D_INPUTREG_MAX];
151   unsigned vbuf_count;
152
153   SVGA3dPrimitiveRange prim[QSZ];
154   struct pipe_resource *prim_ib[QSZ];
155   unsigned prim_count;   /**< number of primitives for this draw */
156   unsigned min_index[QSZ];
157   unsigned max_index[QSZ];
158};
159
160#define IDX_CACHE_MAX  8
161
162struct svga_hwtnl {
163   struct svga_context *svga;
164   struct u_upload_mgr *upload_ib;
165
166   /* Additional negative index bias due to partial buffer uploads
167    * This is compensated for in the offset associated with all
168    * vertex buffers.
169    */
170   int index_bias;
171
172   /* Provoking vertex information (for flat shading). */
173   unsigned api_pv;  /**< app-requested PV mode (PV_FIRST or PV_LAST) */
174   unsigned hw_pv;   /**< device-supported PV mode (PV_FIRST or PV_LAST) */
175
176   /* The triangle fillmode for the device (one of PIPE_POLYGON_MODE_{FILL,
177    * LINE,POINT}).  If the polygon front mode matches the back mode,
178    * api_fillmode will be that mode.  Otherwise, api_fillmode will be
179    * PIPE_POLYGON_MODE_FILL.
180    */
181   unsigned api_fillmode;
182
183   /* Cache the results of running a particular generate func on each
184    * primitive type.
185    */
186   struct index_cache index_cache[PIPE_PRIM_MAX][IDX_CACHE_MAX];
187
188   /* Try to build the maximal draw command packet before emitting:
189    */
190   struct draw_cmd cmd;
191};
192
193
194
195/**
196 * Do we need to use the gallium 'indices' helper to render unfilled
197 * triangles?
198 */
199static inline boolean
200svga_need_unfilled_fallback(const struct svga_hwtnl *hwtnl,
201                            enum pipe_prim_type prim)
202{
203   if (u_reduced_prim(prim) != PIPE_PRIM_TRIANGLES) {
204      /* if we're drawing points or lines, no fallback needed */
205      return FALSE;
206   }
207
208   if ((prim == PIPE_PRIM_QUADS ||
209        prim == PIPE_PRIM_QUAD_STRIP ||
210        prim == PIPE_PRIM_POLYGON) &&
211       hwtnl->api_fillmode == PIPE_POLYGON_MODE_LINE) {
212      /* We can't directly render quads or polygons.  They're
213       * converted to triangles.  If we let the device draw the triangle
214       * outlines we'll get an extra, stray lines in the interiors.
215       * So, to draw unfilled quads correctly, we need the fallback.
216       */
217      return true;
218   }
219   return false;
220}
221
222
223enum pipe_error
224svga_hwtnl_prim(struct svga_hwtnl *hwtnl,
225                const SVGA3dPrimitiveRange *range,
226                unsigned vcount,
227                unsigned min_index,
228                unsigned max_index,
229                struct pipe_resource *ib,
230                unsigned start_instance, unsigned instance_count,
231                const struct pipe_draw_indirect_info *indirect,
232                const struct pipe_stream_output_target *so_vertex_count);
233
234enum pipe_error
235svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
236                                      struct pipe_resource *indexBuffer,
237                                      unsigned index_size,
238                                      int index_bias,
239                                      unsigned min_index,
240                                      unsigned max_index,
241                                      enum pipe_prim_type prim,
242                                      unsigned start,
243                                      unsigned count,
244                                      unsigned start_instance,
245                                      unsigned instance_count,
246                                      ubyte vertices_per_patch);
247
248#endif
249