draw_pipe.c revision 6ae39f6dca8f0968902642f04f1deb6f573edb6d 
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 "draw/draw_private.h"
34#include "draw/draw_pipe.h"
35#include "util/u_debug.h"
36
37
38
39boolean draw_pipeline_init( struct draw_context *draw )
40{
41   /* create pipeline stages */
42   draw->pipeline.wide_line  = draw_wide_line_stage( draw );
43   draw->pipeline.wide_point = draw_wide_point_stage( draw );
44   draw->pipeline.stipple   = draw_stipple_stage( draw );
45   draw->pipeline.unfilled  = draw_unfilled_stage( draw );
46   draw->pipeline.twoside   = draw_twoside_stage( draw );
47   draw->pipeline.offset    = draw_offset_stage( draw );
48   draw->pipeline.clip      = draw_clip_stage( draw );
49   draw->pipeline.flatshade = draw_flatshade_stage( draw );
50   draw->pipeline.cull      = draw_cull_stage( draw );
51   draw->pipeline.validate  = draw_validate_stage( draw );
52   draw->pipeline.first     = draw->pipeline.validate;
53
54   if (!draw->pipeline.wide_line ||
55       !draw->pipeline.wide_point ||
56       !draw->pipeline.stipple ||
57       !draw->pipeline.unfilled ||
58       !draw->pipeline.twoside ||
59       !draw->pipeline.offset ||
60       !draw->pipeline.clip ||
61       !draw->pipeline.flatshade ||
62       !draw->pipeline.cull ||
63       !draw->pipeline.validate)
64      return FALSE;
65
66   /* these defaults are oriented toward the needs of softpipe */
67   draw->pipeline.wide_point_threshold = 1000000.0; /* infinity */
68   draw->pipeline.wide_line_threshold = 1.0;
69   draw->pipeline.wide_point_sprites = FALSE;
70   draw->pipeline.line_stipple = TRUE;
71   draw->pipeline.point_sprite = TRUE;
72
73   return TRUE;
74}
75
76
77void draw_pipeline_destroy( struct draw_context *draw )
78{
79   if (draw->pipeline.wide_line)
80      draw->pipeline.wide_line->destroy( draw->pipeline.wide_line );
81   if (draw->pipeline.wide_point)
82      draw->pipeline.wide_point->destroy( draw->pipeline.wide_point );
83   if (draw->pipeline.stipple)
84      draw->pipeline.stipple->destroy( draw->pipeline.stipple );
85   if (draw->pipeline.unfilled)
86      draw->pipeline.unfilled->destroy( draw->pipeline.unfilled );
87   if (draw->pipeline.twoside)
88      draw->pipeline.twoside->destroy( draw->pipeline.twoside );
89   if (draw->pipeline.offset)
90      draw->pipeline.offset->destroy( draw->pipeline.offset );
91   if (draw->pipeline.clip)
92      draw->pipeline.clip->destroy( draw->pipeline.clip );
93   if (draw->pipeline.flatshade)
94      draw->pipeline.flatshade->destroy( draw->pipeline.flatshade );
95   if (draw->pipeline.cull)
96      draw->pipeline.cull->destroy( draw->pipeline.cull );
97   if (draw->pipeline.validate)
98      draw->pipeline.validate->destroy( draw->pipeline.validate );
99   if (draw->pipeline.aaline)
100      draw->pipeline.aaline->destroy( draw->pipeline.aaline );
101   if (draw->pipeline.aapoint)
102      draw->pipeline.aapoint->destroy( draw->pipeline.aapoint );
103   if (draw->pipeline.pstipple)
104      draw->pipeline.pstipple->destroy( draw->pipeline.pstipple );
105   if (draw->pipeline.rasterize)
106      draw->pipeline.rasterize->destroy( draw->pipeline.rasterize );
107}
108
109
110
111/**
112 * Build primitive to render a point with vertex at v0.
113 */
114static void do_point( struct draw_context *draw,
115		      const char *v0 )
116{
117   struct prim_header prim;
118
119   prim.flags = 0;
120   prim.pad = 0;
121   prim.v[0] = (struct vertex_header *)v0;
122
123   draw->pipeline.first->point( draw->pipeline.first, &prim );
124}
125
126
127/**
128 * Build primitive to render a line with vertices at v0, v1.
129 * \param flags  bitmask of DRAW_PIPE_EDGE_x, DRAW_PIPE_RESET_STIPPLE
130 */
131static void do_line( struct draw_context *draw,
132                     ushort flags,
133		     const char *v0,
134		     const char *v1 )
135{
136   struct prim_header prim;
137
138   prim.flags = flags;
139   prim.pad = 0;
140   prim.v[0] = (struct vertex_header *)v0;
141   prim.v[1] = (struct vertex_header *)v1;
142
143   draw->pipeline.first->line( draw->pipeline.first, &prim );
144}
145
146
147/**
148 * Build primitive to render a triangle with vertices at v0, v1, v2.
149 * \param flags  bitmask of DRAW_PIPE_EDGE_x, DRAW_PIPE_RESET_STIPPLE
150 */
151static void do_triangle( struct draw_context *draw,
152                         ushort flags,
153			 char *v0,
154			 char *v1,
155			 char *v2 )
156{
157   struct prim_header prim;
158
159   prim.v[0] = (struct vertex_header *)v0;
160   prim.v[1] = (struct vertex_header *)v1;
161   prim.v[2] = (struct vertex_header *)v2;
162   prim.flags = flags;
163   prim.pad = 0;
164
165   draw->pipeline.first->tri( draw->pipeline.first, &prim );
166}
167
168
169/*
170 * Set up macros for draw_pt_decompose.h template code.
171 * This code uses vertex indexes / elements.
172 *
173 * Flags are needed by the stipple and unfilled stages.  When the two stages
174 * are active, vcache_run_extras is called and the flags are stored in the
175 * higher bits of i0.  Otherwise, flags do not matter.
176 */
177
178#define TRIANGLE(flags,i0,i1,i2)                                  \
179   do {                                                           \
180      assert(!((i1) & DRAW_PIPE_FLAG_MASK));                      \
181      assert(!((i2) & DRAW_PIPE_FLAG_MASK));                      \
182      do_triangle( draw,                                          \
183                   i0,  /* flags */                               \
184                   verts + stride * (i0 & ~DRAW_PIPE_FLAG_MASK),  \
185                   verts + stride * (i1),                         \
186                   verts + stride * (i2) );                       \
187   } while (0)
188
189#define LINE(flags,i0,i1)                                         \
190   do {                                                           \
191      assert(!((i1) & DRAW_PIPE_FLAG_MASK));                      \
192      do_line( draw,                                              \
193               i0, /* flags */                                    \
194               verts + stride * (i0 & ~DRAW_PIPE_FLAG_MASK),      \
195               verts + stride * (i1) );                           \
196   } while (0)
197
198#define POINT(i0)                               \
199   do {                                         \
200      assert(!((i0) & DRAW_PIPE_FLAG_MASK));    \
201      do_point( draw, verts + stride * (i0) );  \
202   } while (0)
203
204#define GET_ELT(idx) (elts[idx])
205
206#define FUNC pipe_run_elts
207#define FUNC_VARS                               \
208    struct draw_context *draw,                  \
209    unsigned prim,                              \
210    struct vertex_header *vertices,             \
211    unsigned stride,                            \
212    const ushort *elts,                         \
213    unsigned count
214
215#include "draw_pt_decompose.h"
216
217
218
219/**
220 * Code to run the pipeline on a fairly arbitrary collection of vertices.
221 * For drawing indexed primitives.
222 *
223 * Vertex headers must be pre-initialized with the
224 * UNDEFINED_VERTEX_ID, this code will cause that id to become
225 * overwritten, so it may have to be reset if there is the intention
226 * to reuse the vertices.
227 *
228 * This code provides a callback to reset the vertex id's which the
229 * draw_vbuf.c code uses when it has to perform a flush.
230 */
231void draw_pipeline_run( struct draw_context *draw,
232                        const struct draw_vertex_info *vert_info,
233                        const struct draw_prim_info *prim_info)
234{
235   unsigned i, start;
236
237   draw->pipeline.verts = (char *)vert_info->verts;
238   draw->pipeline.vertex_stride = vert_info->stride;
239   draw->pipeline.vertex_count = vert_info->count;
240
241   for (start = i = 0;
242        i < prim_info->primitive_count;
243        start += prim_info->primitive_lengths[i], i++)
244   {
245      const unsigned count = prim_info->primitive_lengths[i];
246
247#if DEBUG
248      /* make sure none of the element indexes go outside the vertex buffer */
249      {
250         unsigned max_index = 0x0, i;
251         /* find the largest element index */
252         for (i = 0; i < count; i++) {
253            unsigned int index = (prim_info->elts[start + i]
254                                  & ~DRAW_PIPE_FLAG_MASK);
255            if (index > max_index)
256               max_index = index;
257         }
258         assert(max_index <= vert_info->count);
259      }
260#endif
261
262      pipe_run_elts(draw,
263                    prim_info->prim,
264                    vert_info->verts,
265                    vert_info->stride,
266                    prim_info->elts + start,
267                    count);
268   }
269
270   draw->pipeline.verts = NULL;
271   draw->pipeline.vertex_count = 0;
272}
273
274
275/*
276 * Set up macros for draw_pt_decompose.h template code.
277 * This code is for non-indexed (aka linear) rendering (no elts).
278 */
279
280#define TRIANGLE(flags,i0,i1,i2)       \
281   do_triangle( draw, flags,           \
282                verts + stride * (i0), \
283                verts + stride * (i1), \
284                verts + stride * (i2) )
285
286#define LINE(flags,i0,i1)              \
287   do_line( draw, flags,               \
288            verts + stride * (i0),     \
289            verts + stride * (i1) )
290
291#define POINT(i0)                      \
292   do_point( draw, verts + stride * (i0) )
293
294
295#define GET_ELT(idx) (idx)
296
297#define FUNC pipe_run_linear
298#define FUNC_VARS                      \
299    struct draw_context *draw,         \
300    unsigned prim,                     \
301    struct vertex_header *vertices,    \
302    unsigned stride,                   \
303    unsigned count
304
305#include "draw_pt_decompose.h"
306
307
308/*
309 * For drawing non-indexed primitives.
310 */
311void draw_pipeline_run_linear( struct draw_context *draw,
312                               const struct draw_vertex_info *vert_info,
313                               const struct draw_prim_info *prim_info)
314{
315   unsigned i, start;
316
317   for (start = i = 0;
318        i < prim_info->primitive_count;
319        start += prim_info->primitive_lengths[i], i++)
320   {
321      unsigned count = prim_info->primitive_lengths[i];
322      char *verts = ((char*)vert_info->verts) +
323                    (start * vert_info->stride);
324
325      draw->pipeline.verts = verts;
326      draw->pipeline.vertex_stride = vert_info->stride;
327      draw->pipeline.vertex_count = count;
328
329      assert(count <= vert_info->count);
330
331      pipe_run_linear(draw,
332                      prim_info->prim,
333                      (struct vertex_header*)verts,
334                      vert_info->stride,
335                      count);
336   }
337
338   draw->pipeline.verts = NULL;
339   draw->pipeline.vertex_count = 0;
340}
341
342
343void draw_pipeline_flush( struct draw_context *draw,
344                          unsigned flags )
345{
346   draw->pipeline.first->flush( draw->pipeline.first, flags );
347   draw->pipeline.first = draw->pipeline.validate;
348}
349