1 /**************************************************************************
2  *
3  * Copyright 2009 VMware, Inc.
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.
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26  **************************************************************************/
27 
28 #ifndef DRAW_GS_H
29 #define DRAW_GS_H
30 
31 #include "draw_context.h"
32 #include "draw_private.h"
33 
34 
35 #define MAX_TGSI_PRIMITIVES 4
36 
37 struct draw_context;
38 
39 /**
40  * Private version of the compiled geometry shader
41  */
42 struct draw_geometry_shader {
43    struct draw_context *draw;
44 
45    struct tgsi_exec_machine *machine;
46 
47    /* This member will disappear shortly:*/
48    struct pipe_shader_state state;
49 
50    struct tgsi_shader_info info;
51    unsigned position_output;
52 
53    unsigned max_output_vertices;
54    unsigned input_primitive;
55    unsigned output_primitive;
56 
57    unsigned *primitive_lengths;
58    unsigned emitted_vertices;
59    unsigned emitted_primitives;
60 
61    float (*tmp_output)[4];
62    unsigned vertex_size;
63 
64    unsigned in_prim_idx;
65    unsigned input_vertex_stride;
66    const float (*input)[4];
67 };
68 
69 /*
70  * Returns the number of vertices emitted.
71  * The vertex shader can emit any number of vertices as long as it's
72  * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
73  */
74 int draw_geometry_shader_run(struct draw_geometry_shader *shader,
75                              const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
76                              const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
77                              const struct draw_vertex_info *input_verts,
78                              const struct draw_prim_info *input_prim,
79                              struct draw_vertex_info *output_verts,
80                              struct draw_prim_info *output_prims );
81 
82 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
83                                   struct draw_context *draw);
84 
85 void draw_geometry_shader_delete(struct draw_geometry_shader *shader);
86 
87 int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
88                                 unsigned pipe_prim);
89 
90 #endif
91