1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
31 #include "draw_context.h"
32 #include "tgsi/tgsi_exec.h"
33 #include "draw_private.h"
35 #define MAX_TGSI_PRIMITIVES 4
40 struct draw_gs_jit_context
;
41 struct draw_gs_llvm_variant
;
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
52 struct draw_gs_inputs
{
53 float data
[6][PIPE_MAX_SHADER_INPUTS
][TGSI_NUM_CHANNELS
][TGSI_NUM_CHANNELS
];
58 * Private version of the compiled geometry shader
60 struct draw_geometry_shader
{
61 struct draw_context
*draw
;
63 struct tgsi_exec_machine
*machine
;
65 /* This member will disappear shortly:*/
66 struct pipe_shader_state state
;
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
];
73 unsigned max_output_vertices
;
74 unsigned primitive_boundary
;
75 unsigned input_primitive
;
76 unsigned output_primitive
;
78 unsigned *primitive_lengths
;
79 unsigned emitted_vertices
;
80 unsigned emitted_primitives
;
82 float (*tmp_output
)[4];
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
;
93 unsigned num_invocations
;
94 unsigned invocation_id
;
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
;
101 int **llvm_prim_lengths
;
102 int *llvm_emitted_primitives
;
103 int *llvm_emitted_vertices
;
107 void (*fetch_inputs
)(struct draw_geometry_shader
*shader
,
109 unsigned num_vertices
,
111 void (*fetch_outputs
)(struct draw_geometry_shader
*shader
,
112 unsigned num_primitives
,
113 float (**p_output
)[4]);
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
);
122 void draw_geometry_shader_new_instance(struct draw_geometry_shader
*gs
);
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.
129 int 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
);
138 void draw_geometry_shader_prepare(struct draw_geometry_shader
*shader
,
139 struct draw_context
*draw
);
141 int draw_gs_max_output_vertices(struct draw_geometry_shader
*shader
,
145 void draw_gs_set_current_variant(struct draw_geometry_shader
*shader
,
146 struct draw_gs_llvm_variant
*variant
);