1 // license:BSD-3-Clause
2 // copyright-holders:Ryan Holtz
3 //============================================================
4 //
5 // paramreader.cpp - BGFX shader parameter JSON reader
6 //
7 //============================================================
8
9 #include <string>
10
11 #include "paramreader.h"
12
13 #include "parameter.h"
14 #include "frameparameter.h"
15 #include "windowparameter.h"
16 #include "timeparameter.h"
17 #include "chainmanager.h"
18
19 const parameter_reader::string_to_enum parameter_reader::TYPE_NAMES[parameter_reader::TYPE_COUNT] = {
20 { "frame", bgfx_parameter::parameter_type::PARAM_FRAME },
21 { "window", bgfx_parameter::parameter_type::PARAM_WINDOW },
22 { "time", bgfx_parameter::parameter_type::PARAM_TIME }
23 };
24
read_from_value(const Value & value,std::string prefix,chain_manager & chains)25 bgfx_parameter* parameter_reader::read_from_value(const Value& value, std::string prefix, chain_manager& chains)
26 {
27 if (!validate_parameters(value, prefix))
28 {
29 return nullptr;
30 }
31
32 std::string name = value["name"].GetString();
33 bgfx_parameter::parameter_type type = bgfx_parameter::parameter_type(get_enum_from_value(value, "type", bgfx_parameter::parameter_type::PARAM_FRAME, TYPE_NAMES, TYPE_COUNT));
34
35 if (type == bgfx_parameter::parameter_type::PARAM_FRAME)
36 {
37 uint32_t period = int(value["period"].GetDouble());
38 return new bgfx_frame_parameter(name, type, period);
39 }
40 else if (type == bgfx_parameter::parameter_type::PARAM_WINDOW)
41 {
42 return new bgfx_window_parameter(name, type, chains.window_index());
43 }
44 else if (type == bgfx_parameter::parameter_type::PARAM_TIME)
45 {
46 auto limit = float(value["limit"].GetDouble());
47 return new bgfx_time_parameter(name, type, limit);
48 }
49 else
50 {
51 READER_CHECK(false, (prefix + "Unknown parameter type '" + std::string(value["type"].GetString()) + "'\n").c_str());
52 }
53
54 return nullptr;
55 }
56
validate_parameters(const Value & value,std::string prefix)57 bool parameter_reader::validate_parameters(const Value& value, std::string prefix)
58 {
59 if (!READER_CHECK(value.HasMember("name"), (prefix + "Must have string value 'name'\n").c_str())) return false;
60 if (!READER_CHECK(value["name"].IsString(), (prefix + "Value 'name' must be a string\n").c_str())) return false;
61 if (!READER_CHECK(value.HasMember("type"), (prefix + "Must have string value 'type'\n").c_str())) return false;
62 if (!READER_CHECK(value["type"].IsString(), (prefix + "Value 'type' must be a string\n").c_str())) return false;
63 if (!READER_CHECK(!value.HasMember("period") || value["period"].IsNumber(), (prefix + "Value 'period' must be numeric\n").c_str())) return false;
64 if (!READER_CHECK(!value.HasMember("limit") || value["limit"].IsNumber(), (prefix + "Value 'period' must be numeric\n").c_str())) return false;
65 return true;
66 }
67