draw_gs.h revision da30209afdd77199c98694ef64c6eaea557d0918 
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.
25 *
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
37struct draw_context;
38
39/**
40 * Private version of the compiled geometry shader
41 */
42struct 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 */
74int draw_geometry_shader_run(struct draw_geometry_shader *shader,
75                             const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
76                             const struct draw_vertex_info *input_verts,
77                             const struct draw_prim_info *input_prim,
78                             struct draw_vertex_info *output_verts,
79                             struct draw_prim_info *output_prims );
80
81void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
82                                  struct draw_context *draw);
83
84void draw_geometry_shader_delete(struct draw_geometry_shader *shader);
85
86int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
87                                unsigned pipe_prim);
88
89#endif
90