1 /*
2  * Copyright © 2013 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  */
23 
24 /**
25  * \file brw_vec4_gs_visitor.h
26  *
27  * Geometry-shader-specific code derived from the vec4_visitor class.
28  */
29 
30 #ifndef BRW_VEC4_GS_VISITOR_H
31 #define BRW_VEC4_GS_VISITOR_H
32 
33 #include "brw_vec4.h"
34 
35 #define MAX_GS_INPUT_VERTICES 6
36 
37 #ifdef __cplusplus
38 namespace brw {
39 
40 class vec4_gs_visitor : public vec4_visitor
41 {
42 public:
43    vec4_gs_visitor(const struct brw_compiler *compiler,
44                    void *log_data,
45                    struct brw_gs_compile *c,
46                    struct brw_gs_prog_data *prog_data,
47                    const nir_shader *shader,
48                    void *mem_ctx,
49                    bool no_spills,
50                    int shader_time_index,
51                    bool debug_enabled);
52 
53    virtual void nir_setup_inputs();
54 
55 protected:
56    virtual void setup_payload();
57    virtual void emit_prolog();
58    virtual void emit_thread_end();
59    virtual void emit_urb_write_header(int mrf);
60    virtual vec4_instruction *emit_urb_write_opcode(bool complete);
61    virtual void gs_emit_vertex(int stream_id);
62    virtual void gs_end_primitive();
63    virtual void nir_emit_intrinsic(nir_intrinsic_instr *instr);
64 
65 protected:
66    int setup_varying_inputs(int payload_reg, int attributes_per_reg);
67    void emit_control_data_bits();
68    void set_stream_control_data_bits(unsigned stream_id);
69 
70    src_reg vertex_count;
71    src_reg control_data_bits;
72    const struct brw_gs_compile * const c;
73    struct brw_gs_prog_data * const gs_prog_data;
74 };
75 
76 } /* namespace brw */
77 #endif /* __cplusplus */
78 
79 #endif /* BRW_VEC4_GS_VISITOR_H */
80