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annotate DPF-Prymula-audioplugins/dpf/distrho/src/travesty/base.h @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
parents
children
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3
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1 /*
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2 * travesty, pure C VST3-compatible interface
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3 * Copyright (C) 2021-2022 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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prymula <prymula76@outlook.com>
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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prymula <prymula76@outlook.com>
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #pragma once
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18
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19 #include <stdbool.h>
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20 #include <stdint.h>
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21 #include <string.h>
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22
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23 /**
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24 * deal with C vs C++ differences
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25 */
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26
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27 #if !defined(__cplusplus) && !defined(constexpr)
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28 # define constexpr
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29 #endif
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30
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31 /**
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32 * various types
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33 */
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34
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35 typedef int32_t v3_result;
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36
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37 typedef int16_t v3_str_128[128];
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38 typedef uint8_t v3_bool;
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39
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40 typedef uint32_t v3_param_id;
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41
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42 /**
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43 * low-level ABI nonsense
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44 */
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45
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46 typedef uint8_t v3_tuid[16];
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47
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48 static inline
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49 bool v3_tuid_match(const v3_tuid a, const v3_tuid b)
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50 {
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51 return memcmp(a, b, sizeof(v3_tuid)) == 0;
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52 }
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53
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54 #if defined(_WIN32)
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55 # define V3_COM_COMPAT 1
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56 # define V3_API __stdcall
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57 #else
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58 # define V3_COM_COMPAT 0
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59 # define V3_API
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60 #endif
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61
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62 #if V3_COM_COMPAT
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63 enum {
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64 V3_NO_INTERFACE = 0x80004002L,
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65 V3_OK = 0,
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66 V3_TRUE = 0,
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67 V3_FALSE = 1,
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68 V3_INVALID_ARG = 0x80070057L,
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69 V3_NOT_IMPLEMENTED = 0x80004001L,
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70 V3_INTERNAL_ERR = 0x80004005L,
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71 V3_NOT_INITIALIZED = 0x8000FFFFL,
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72 V3_NOMEM = 0x8007000EL
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73 };
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74
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75 # define V3_ID(a, b, c, d) { \
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76 ((a) & 0x000000FF), \
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77 ((a) & 0x0000FF00) >> 8, \
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78 ((a) & 0x00FF0000) >> 16, \
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79 ((a) & 0xFF000000) >> 24, \
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80 \
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81 ((b) & 0x00FF0000) >> 16, \
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82 ((b) & 0xFF000000) >> 24, \
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83 ((b) & 0x000000FF), \
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84 ((b) & 0x0000FF00) >> 8, \
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85 \
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86 ((c) & 0xFF000000) >> 24, \
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87 ((c) & 0x00FF0000) >> 16, \
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88 ((c) & 0x0000FF00) >> 8, \
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89 ((c) & 0x000000FF), \
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90 \
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91 ((d) & 0xFF000000) >> 24, \
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92 ((d) & 0x00FF0000) >> 16, \
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93 ((d) & 0x0000FF00) >> 8, \
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94 ((d) & 0x000000FF), \
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95 }
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96
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97 #else // V3_COM_COMPAT
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98 enum {
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99 V3_NO_INTERFACE = -1,
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100 V3_OK,
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101 V3_TRUE = V3_OK,
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102 V3_FALSE,
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103 V3_INVALID_ARG,
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104 V3_NOT_IMPLEMENTED,
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105 V3_INTERNAL_ERR,
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106 V3_NOT_INITIALIZED,
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107 V3_NOMEM
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108 };
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109
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110 # define V3_ID(a, b, c, d) { \
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111 ((a) & 0xFF000000) >> 24, \
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112 ((a) & 0x00FF0000) >> 16, \
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113 ((a) & 0x0000FF00) >> 8, \
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114 ((a) & 0x000000FF), \
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115 \
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116 ((b) & 0xFF000000) >> 24, \
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117 ((b) & 0x00FF0000) >> 16, \
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118 ((b) & 0x0000FF00) >> 8, \
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119 ((b) & 0x000000FF), \
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120 \
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121 ((c) & 0xFF000000) >> 24, \
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122 ((c) & 0x00FF0000) >> 16, \
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diff changeset
123 ((c) & 0x0000FF00) >> 8, \
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124 ((c) & 0x000000FF), \
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prymula <prymula76@outlook.com>
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125 \
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prymula <prymula76@outlook.com>
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126 ((d) & 0xFF000000) >> 24, \
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127 ((d) & 0x00FF0000) >> 16, \
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128 ((d) & 0x0000FF00) >> 8, \
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129 ((d) & 0x000000FF), \
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130 }
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131 #endif // V3_COM_COMPAT
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132
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133 #define V3_ID_COPY(iid) \
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134 { iid[0], iid[1], iid[ 2], iid[ 3], iid[ 4], iid[ 5], iid[ 6], iid[ 7], \
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135 iid[8], iid[9], iid[10], iid[11], iid[12], iid[13], iid[14], iid[15] }
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136
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137 /**
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prymula <prymula76@outlook.com>
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138 * funknown
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139 */
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140
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141 struct v3_funknown {
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142 v3_result (V3_API* query_interface)(void* self, const v3_tuid iid, void** obj);
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143 uint32_t (V3_API* ref)(void* self);
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144 uint32_t (V3_API* unref)(void* self);
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145 };
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146
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147 static constexpr const v3_tuid v3_funknown_iid =
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148 V3_ID(0x00000000, 0x00000000, 0xC0000000, 0x00000046);
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149
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150 /**
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prymula <prymula76@outlook.com>
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151 * plugin base
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152 */
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153
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154 struct v3_plugin_base {
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155 #ifndef __cplusplus
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156 struct v3_funknown;
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157 #endif
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158 v3_result (V3_API* initialize)(void* self, struct v3_funknown** context);
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159 v3_result (V3_API* terminate)(void* self);
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160 };
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161
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162 static constexpr const v3_tuid v3_plugin_base_iid =
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163 V3_ID(0x22888DDB, 0x156E45AE, 0x8358B348, 0x08190625);
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164
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165 #ifdef __cplusplus
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166
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167 /**
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prymula <prymula76@outlook.com>
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168 * cast object into its proper C++ type.
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169 * this is needed because `struct v3_funknown;` on a C++ class does not inherit `v3_funknown`'s fields.
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prymula <prymula76@outlook.com>
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170 *
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171 * we can use this as a little helper for keeping both C and C++ compatiblity.
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172 * specialized templated calls are defined where required
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173 * (that is, object inherits from something other than `v3_funknown`)
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prymula <prymula76@outlook.com>
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174 *
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175 * example usage: `v3_cpp_obj(obj)->method(obj, args...);`
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176 */
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177
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178 template<class T> static inline
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179 constexpr T* v3_cpp_obj(T** obj)
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180 {
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181 /**
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prymula <prymula76@outlook.com>
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182 * this ugly piece of code is required due to C++ assuming `reinterpret_cast` by default,
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prymula <prymula76@outlook.com>
parents:
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183 * but we need everything to be `static_cast` for it to be `constexpr` compatible.
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prymula <prymula76@outlook.com>
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184 */
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185 return static_cast<T*>(static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*3));
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186 }
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187
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188 /**
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prymula <prymula76@outlook.com>
parents:
diff changeset
189 * helper C++ functions to manually call v3_funknown methods on an object.
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prymula <prymula76@outlook.com>
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190 */
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parents:
diff changeset
191
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prymula <prymula76@outlook.com>
parents:
diff changeset
192 template<class T, class M> static inline
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193 v3_result v3_cpp_obj_query_interface(T** obj, const v3_tuid iid, M*** obj2)
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194 {
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195 return static_cast<v3_funknown*>(static_cast<void*>(*obj))->query_interface(obj, iid, (void**)obj2);
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196 }
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diff changeset
197
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diff changeset
198 template<class T> static inline
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199 uint32_t v3_cpp_obj_ref(T** obj)
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200 {
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diff changeset
201 return static_cast<v3_funknown*>(static_cast<void*>(*obj))->ref(obj);
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prymula <prymula76@outlook.com>
parents:
diff changeset
202 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
203
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parents:
diff changeset
204 template<class T> static inline
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diff changeset
205 uint32_t v3_cpp_obj_unref(T** obj)
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parents:
diff changeset
206 {
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diff changeset
207 return static_cast<v3_funknown*>(static_cast<void*>(*obj))->unref(obj);
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prymula <prymula76@outlook.com>
parents:
diff changeset
208 }
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parents:
diff changeset
209
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prymula <prymula76@outlook.com>
parents:
diff changeset
210 template<class T> static inline
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parents:
diff changeset
211 v3_result v3_cpp_obj_initialize(T** obj, v3_funknown** context)
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parents:
diff changeset
212 {
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parents:
diff changeset
213 return static_cast<v3_plugin_base*>(
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parents:
diff changeset
214 static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*3))->initialize(obj, context);
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parents:
diff changeset
215 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
216
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prymula <prymula76@outlook.com>
parents:
diff changeset
217 template<class T> static inline
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diff changeset
218 v3_result v3_cpp_obj_terminate(T** obj)
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parents:
diff changeset
219 {
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parents:
diff changeset
220 return static_cast<v3_plugin_base*>(
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diff changeset
221 static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*3))->terminate(obj);
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prymula <prymula76@outlook.com>
parents:
diff changeset
222 }
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parents:
diff changeset
223
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prymula <prymula76@outlook.com>
parents:
diff changeset
224 #endif