2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
26 * Keith Whitwell <keith@tungstengraphics.com>
30 #include "main/api_arrayelt.h"
31 #include "main/glheader.h"
32 #include "main/mtypes.h"
33 #include "main/vtxfmt.h"
34 #include "vbo_context.h"
38 void vbo_exec_init( struct gl_context
*ctx
)
40 struct vbo_exec_context
*exec
= &vbo_context(ctx
)->exec
;
44 /* Initialize the arrayelt helper
46 if (!ctx
->aelt_context
&&
47 !_ae_create_context( ctx
))
50 vbo_exec_vtx_init( exec
);
51 vbo_exec_array_init( exec
);
53 ctx
->Driver
.NeedFlush
= 0;
54 ctx
->Driver
.CurrentExecPrimitive
= PRIM_OUTSIDE_BEGIN_END
;
55 ctx
->Driver
.BeginVertices
= vbo_exec_BeginVertices
;
56 ctx
->Driver
.FlushVertices
= vbo_exec_FlushVertices
;
58 vbo_exec_invalidate_state( ctx
, ~0 );
62 void vbo_exec_destroy( struct gl_context
*ctx
)
64 struct vbo_exec_context
*exec
= &vbo_context(ctx
)->exec
;
66 if (ctx
->aelt_context
) {
67 _ae_destroy_context( ctx
);
68 ctx
->aelt_context
= NULL
;
71 vbo_exec_vtx_destroy( exec
);
72 vbo_exec_array_destroy( exec
);
77 * Really want to install these callbacks to a central facility to be
78 * invoked according to the state flags. That will have to wait for a
81 void vbo_exec_invalidate_state( struct gl_context
*ctx
, GLuint new_state
)
83 struct vbo_context
*vbo
= vbo_context(ctx
);
84 struct vbo_exec_context
*exec
= &vbo
->exec
;
86 if (!exec
->validating
&& new_state
& (_NEW_PROGRAM
|_NEW_ARRAY
)) {
87 exec
->array
.recalculate_inputs
= GL_TRUE
;
89 /* If we ended up here because a VAO was deleted, the _DrawArrays
90 * pointer which pointed to the VAO might be invalid now, so set it
91 * to NULL. This prevents crashes in driver functions like Clear
92 * where driver state validation might occur, but the vbo module is
93 * still in an invalid state.
95 * Drivers should skip vertex array state validation if _DrawArrays
96 * is NULL. It also has no effect on performance, because attrib
97 * bindings will be recalculated anyway.
99 if (vbo
->last_draw_method
== DRAW_ARRAYS
) {
100 ctx
->Array
._DrawArrays
= NULL
;
101 vbo
->last_draw_method
= DRAW_NONE
;
105 if (new_state
& _NEW_EVAL
)
106 exec
->eval
.recalculate_maps
= 1;
108 _ae_invalidate_state(ctx
, new_state
);
113 * Figure out the number of transform feedback primitives that will be output
114 * considering the drawing mode, number of vertices, and instance count,
115 * assuming that no geometry shading is done and primitive restart is not
118 * This is used by driver back-ends in implementing the PRIMITIVES_GENERATED
119 * and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries. It is also used to
120 * pre-validate draw calls in GLES3 (where draw calls only succeed if there is
121 * enough room in the transform feedback buffer for the result).
124 vbo_count_tessellated_primitives(GLenum mode
, GLuint count
,
125 GLuint num_instances
)
127 size_t num_primitives
;
130 num_primitives
= count
;
133 num_primitives
= count
>= 2 ? count
- 1 : 0;
136 num_primitives
= count
>= 2 ? count
: 0;
139 num_primitives
= count
/ 2;
141 case GL_TRIANGLE_STRIP
:
142 case GL_TRIANGLE_FAN
:
144 num_primitives
= count
>= 3 ? count
- 2 : 0;
147 num_primitives
= count
/ 3;
150 num_primitives
= count
>= 4 ? ((count
/ 2) - 1) * 2 : 0;
153 num_primitives
= (count
/ 4) * 2;
156 assert(!"Unexpected primitive type in count_tessellated_primitives");
160 return num_primitives
* num_instances
;