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 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.
26 **************************************************************************/
31 #include "draw_context.h"
32 #include "draw_private.h"
34 #define MAX_TGSI_PRIMITIVES 4
39 struct draw_gs_jit_context;
40 struct draw_gs_llvm_variant;
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
51 struct draw_gs_inputs {
52 float data[6][PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS][TGSI_NUM_CHANNELS];
57 * Private version of the compiled geometry shader
59 struct draw_geometry_shader {
60 struct draw_context *draw;
62 struct tgsi_exec_machine *machine;
64 /* This member will disappear shortly:*/
65 struct pipe_shader_state state;
67 struct tgsi_shader_info info;
68 unsigned position_output;
69 unsigned viewport_index_output;
70 unsigned clipdistance_output[2];
72 unsigned max_output_vertices;
73 unsigned primitive_boundary;
74 unsigned input_primitive;
75 unsigned output_primitive;
77 unsigned *primitive_lengths;
78 unsigned emitted_vertices;
79 unsigned emitted_primitives;
81 float (*tmp_output)[4];
85 unsigned input_vertex_stride;
86 unsigned fetched_prim_count;
87 const float (*input)[4];
88 const struct tgsi_shader_info *input_info;
89 unsigned vector_length;
90 unsigned max_out_prims;
93 struct draw_gs_inputs *gs_input;
94 struct draw_gs_jit_context *jit_context;
95 struct draw_gs_llvm_variant *current_variant;
96 struct vertex_header *gs_output;
98 int **llvm_prim_lengths;
99 int *llvm_emitted_primitives;
100 int *llvm_emitted_vertices;
104 void (*fetch_inputs)(struct draw_geometry_shader *shader,
106 unsigned num_vertices,
108 void (*fetch_outputs)(struct draw_geometry_shader *shader,
109 unsigned num_primitives,
110 float (**p_output)[4]);
112 void (*prepare)(struct draw_geometry_shader *shader,
113 const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
114 const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS]);
115 unsigned (*run)(struct draw_geometry_shader *shader,
116 unsigned input_primitives);
119 void draw_geometry_shader_new_instance(struct draw_geometry_shader *gs);
122 * Returns the number of vertices emitted.
123 * The vertex shader can emit any number of vertices as long as it's
124 * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
126 int draw_geometry_shader_run(struct draw_geometry_shader *shader,
127 const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
128 const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
129 const struct draw_vertex_info *input_verts,
130 const struct draw_prim_info *input_prim,
131 const struct tgsi_shader_info *input_info,
132 struct draw_vertex_info *output_verts,
133 struct draw_prim_info *output_prims );
135 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
136 struct draw_context *draw);
138 int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
142 void draw_gs_set_current_variant(struct draw_geometry_shader *shader,
143 struct draw_gs_llvm_variant *variant);