draw_gs.h revision 01e04c3f 
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 VMWARE 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 "tgsi/tgsi_exec.h"
33#include "draw_private.h"
34
35#define MAX_TGSI_PRIMITIVES 4
36
37struct draw_context;
38
39#ifdef HAVE_LLVM
40struct draw_gs_jit_context;
41struct draw_gs_llvm_variant;
42
43/**
44 * Structure holding the inputs to the geometry shader. It uses SOA layout.
45 * The dimensions are as follows:
46 * - maximum number of vertices for a geometry shader input primitive
47 *   (6 for triangle_adjacency)
48 * - maximum number of attributes for each vertex
49 * - four channels per each attribute (x,y,z,w)
50 * - number of input primitives equal to the SOA vector length
51 */
52struct draw_gs_inputs {
53   float data[6][PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS][TGSI_NUM_CHANNELS];
54};
55#endif
56
57/**
58 * Private version of the compiled geometry shader
59 */
60struct draw_geometry_shader {
61   struct draw_context *draw;
62
63   struct tgsi_exec_machine *machine;
64
65   /* This member will disappear shortly:*/
66   struct pipe_shader_state state;
67
68   struct tgsi_shader_info info;
69   unsigned position_output;
70   unsigned viewport_index_output;
71   unsigned ccdistance_output[PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT];
72
73   unsigned max_output_vertices;
74   unsigned primitive_boundary;
75   unsigned input_primitive;
76   unsigned output_primitive;
77
78   unsigned *primitive_lengths;
79   unsigned emitted_vertices;
80   unsigned emitted_primitives;
81
82   float (*tmp_output)[4];
83   unsigned vertex_size;
84
85   unsigned in_prim_idx;
86   unsigned input_vertex_stride;
87   unsigned fetched_prim_count;
88   const float (*input)[4];
89   const struct tgsi_shader_info *input_info;
90   unsigned vector_length;
91   unsigned max_out_prims;
92
93   unsigned num_invocations;
94   unsigned invocation_id;
95#ifdef HAVE_LLVM
96   struct draw_gs_inputs *gs_input;
97   struct draw_gs_jit_context *jit_context;
98   struct draw_gs_llvm_variant *current_variant;
99   struct vertex_header *gs_output;
100
101   int **llvm_prim_lengths;
102   int *llvm_emitted_primitives;
103   int *llvm_emitted_vertices;
104   int *llvm_prim_ids;
105#endif
106
107   void (*fetch_inputs)(struct draw_geometry_shader *shader,
108                        unsigned *indices,
109                        unsigned num_vertices,
110                        unsigned prim_idx);
111   void (*fetch_outputs)(struct draw_geometry_shader *shader,
112                         unsigned num_primitives,
113                         float (**p_output)[4]);
114
115   void     (*prepare)(struct draw_geometry_shader *shader,
116                       const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
117                       const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS]);
118   unsigned (*run)(struct draw_geometry_shader *shader,
119                   unsigned input_primitives);
120};
121
122void draw_geometry_shader_new_instance(struct draw_geometry_shader *gs);
123
124/*
125 * Returns the number of vertices emitted.
126 * The vertex shader can emit any number of vertices as long as it's
127 * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
128 */
129int draw_geometry_shader_run(struct draw_geometry_shader *shader,
130                             const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
131                             const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
132                             const struct draw_vertex_info *input_verts,
133                             const struct draw_prim_info *input_prim,
134                             const struct tgsi_shader_info *input_info,
135                             struct draw_vertex_info *output_verts,
136                             struct draw_prim_info *output_prims );
137
138void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
139                                  struct draw_context *draw);
140
141int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
142                                unsigned pipe_prim);
143
144#ifdef HAVE_LLVM
145void draw_gs_set_current_variant(struct draw_geometry_shader *shader,
146                                 struct draw_gs_llvm_variant *variant);
147#endif
148
149#endif
150