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
vbo_exec_init(struct gl_context * ctx)37 void 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
vbo_exec_destroy(struct gl_context * ctx)65 void 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 */
vbo_exec_invalidate_state(struct gl_context * ctx,GLuint new_state)84 void 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 */
107 size_t
count_tessellated_primitives(const struct _mesa_prim * prim)108 count_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