1/*
2 * Mesa 3-D graphics library
3 * Version:  6.3
4 *
5 * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *    Keith Whitwell <keith@tungstengraphics.com>
26 */
27
28
29#include "main/api_arrayelt.h"
30#include "main/glheader.h"
31#include "main/mtypes.h"
32#include "main/vtxfmt.h"
33#include "vbo_context.h"
34
35
36
37void vbo_exec_init( struct gl_context *ctx )
38{
39   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
40
41   exec->ctx = ctx;
42
43   /* Initialize the arrayelt helper
44    */
45   if (!ctx->aelt_context &&
46       !_ae_create_context( ctx ))
47      return;
48
49   vbo_exec_vtx_init( exec );
50   vbo_exec_array_init( exec );
51
52   /* Hook our functions into exec and compile dispatch tables.
53    */
54   _mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt );
55
56   ctx->Driver.NeedFlush = 0;
57   ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
58   ctx->Driver.BeginVertices = vbo_exec_BeginVertices;
59   ctx->Driver.FlushVertices = vbo_exec_FlushVertices;
60
61   vbo_exec_invalidate_state( ctx, ~0 );
62}
63
64
65void vbo_exec_destroy( struct gl_context *ctx )
66{
67   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
68
69   if (ctx->aelt_context) {
70      _ae_destroy_context( ctx );
71      ctx->aelt_context = NULL;
72   }
73
74   vbo_exec_vtx_destroy( exec );
75   vbo_exec_array_destroy( exec );
76}
77
78
79/**
80 * Really want to install these callbacks to a central facility to be
81 * invoked according to the state flags.  That will have to wait for a
82 * mesa rework:
83 */
84void vbo_exec_invalidate_state( struct gl_context *ctx, GLuint new_state )
85{
86   struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
87
88   if (new_state & (_NEW_PROGRAM|_NEW_ARRAY)) {
89      exec->array.recalculate_inputs = GL_TRUE;
90   }
91
92   if (new_state & (_NEW_PROGRAM|_NEW_EVAL))
93      exec->eval.recalculate_maps = 1;
94
95   _ae_invalidate_state(ctx, new_state);
96}
97
98
99/**
100 * Figure out the number of transform feedback primitives that will be output
101 * by the given _mesa_prim command, assuming that no geometry shading is done
102 * and primitive restart is not used.
103 *
104 * This is intended for use by driver back-ends in implementing the
105 * PRIMITIVES_GENERATED and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries.
106 */
107size_t
108count_tessellated_primitives(const struct _mesa_prim *prim)
109{
110   size_t num_primitives;
111   switch (prim->mode) {
112   case GL_POINTS:
113      num_primitives = prim->count;
114      break;
115   case GL_LINE_STRIP:
116      num_primitives = prim->count >= 2 ? prim->count - 1 : 0;
117      break;
118   case GL_LINE_LOOP:
119      num_primitives = prim->count >= 2 ? prim->count : 0;
120      break;
121   case GL_LINES:
122      num_primitives = prim->count / 2;
123      break;
124   case GL_TRIANGLE_STRIP:
125   case GL_TRIANGLE_FAN:
126   case GL_POLYGON:
127      num_primitives = prim->count >= 3 ? prim->count - 2 : 0;
128      break;
129   case GL_TRIANGLES:
130      num_primitives = prim->count / 3;
131      break;
132   case GL_QUAD_STRIP:
133      num_primitives = prim->count >= 4 ? ((prim->count / 2) - 1) * 2 : 0;
134      break;
135   case GL_QUADS:
136      num_primitives = (prim->count / 4) * 2;
137      break;
138   default:
139      assert(!"Unexpected primitive type in count_tessellated_primitives");
140      num_primitives = 0;
141      break;
142   }
143   return num_primitives * prim->num_instances;
144}
145