draw_gs.h revision af69d88d 
1/**************************************************************************
2 *
3 * Copyright 2009 VMware, Inc.
4 * All Rights Reserved.
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6 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * permit persons to whom the Software is furnished to do so, subject to
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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 *
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19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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27
28#ifndef DRAW_GS_H
29#define DRAW_GS_H
30
31#include "draw_context.h"
32#include "draw_private.h"
33
34#define MAX_TGSI_PRIMITIVES 4
35
36struct draw_context;
37
38#ifdef HAVE_LLVM
39struct draw_gs_jit_context;
40struct draw_gs_llvm_variant;
41
42/**
43 * Structure holding the inputs to the geometry shader. It uses SOA layout.
44 * The dimensions are as follows:
45 * - maximum number of vertices for a geometry shader input primitive
46 *   (6 for triangle_adjacency)
47 * - maximum number of attributes for each vertex
48 * - four channels per each attribute (x,y,z,w)
49 * - number of input primitives equal to the SOA vector length
50 */
51struct draw_gs_inputs {
52   float data[6][PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS][TGSI_NUM_CHANNELS];
53};
54#endif
55
56/**
57 * Private version of the compiled geometry shader
58 */
59struct draw_geometry_shader {
60   struct draw_context *draw;
61
62   struct tgsi_exec_machine *machine;
63
64   /* This member will disappear shortly:*/
65   struct pipe_shader_state state;
66
67   struct tgsi_shader_info info;
68   unsigned position_output;
69   unsigned viewport_index_output;
70   unsigned clipdistance_output[PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT];
71   unsigned culldistance_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#ifdef HAVE_LLVM
94   struct draw_gs_inputs *gs_input;
95   struct draw_gs_jit_context *jit_context;
96   struct draw_gs_llvm_variant *current_variant;
97   struct vertex_header *gs_output;
98
99   int **llvm_prim_lengths;
100   int *llvm_emitted_primitives;
101   int *llvm_emitted_vertices;
102   int *llvm_prim_ids;
103#endif
104
105   void (*fetch_inputs)(struct draw_geometry_shader *shader,
106                        unsigned *indices,
107                        unsigned num_vertices,
108                        unsigned prim_idx);
109   void (*fetch_outputs)(struct draw_geometry_shader *shader,
110                         unsigned num_primitives,
111                         float (**p_output)[4]);
112
113   void     (*prepare)(struct draw_geometry_shader *shader,
114                       const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
115                       const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS]);
116   unsigned (*run)(struct draw_geometry_shader *shader,
117                   unsigned input_primitives);
118};
119
120void draw_geometry_shader_new_instance(struct draw_geometry_shader *gs);
121
122/*
123 * Returns the number of vertices emitted.
124 * The vertex shader can emit any number of vertices as long as it's
125 * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
126 */
127int draw_geometry_shader_run(struct draw_geometry_shader *shader,
128                             const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
129                             const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
130                             const struct draw_vertex_info *input_verts,
131                             const struct draw_prim_info *input_prim,
132                             const struct tgsi_shader_info *input_info,
133                             struct draw_vertex_info *output_verts,
134                             struct draw_prim_info *output_prims );
135
136void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
137                                  struct draw_context *draw);
138
139int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
140                                unsigned pipe_prim);
141
142#ifdef HAVE_LLVM
143void draw_gs_set_current_variant(struct draw_geometry_shader *shader,
144                                 struct draw_gs_llvm_variant *variant);
145#endif
146
147#endif
148