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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "opengl.h"
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5 #include "vr.h"
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6 #include "vr_impl.h"
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7 #include "mathutil.h"
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8
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9
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10 static void fallback_present(void);
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11
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12
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13 static struct vr_module *vrm;
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14 static float idmat[] = {
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15 1, 0, 0, 0,
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16 0, 1, 0, 0,
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17 0, 0, 1, 0,
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18 0, 0, 0, 1
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19 };
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20 static float fbtex_rect[] = {
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21 0, 0, 1, 1
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22 };
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23
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24 static void *defopt; /* default options db */
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25
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26 static struct {
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27 float umin, umax, vmin, vmax;
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28 int tex;
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29 } rtarg[2];
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30
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31
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32 int vr_init(void)
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33 {
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34 int i, nmodules;
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35 char *vrmod_env;
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36
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37 /* create the default options database */
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38 if(!defopt && (defopt = create_options())) {
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39 set_option_float(defopt, VR_RENDER_RES_SCALE, 1.0);
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40 set_option_float(defopt, VR_EYE_HEIGHT, 1.675);
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41 set_option_float(defopt, VR_IPD, 0.064);
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42 }
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43
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44 if(vrm) {
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45 vr_shutdown();
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46 }
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47
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48 vr_init_modules();
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49
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50 nmodules = vr_get_num_modules();
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51 for(i=0; i<nmodules; i++) {
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52 struct vr_module *m = vr_get_module(i);
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53 if(m->init() != -1) {
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54 /* add to the active modules array */
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55 vr_activate_module(i);
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56 }
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57 }
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58
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59 if(!vr_get_num_active_modules()) {
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60 return -1;
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61 }
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62
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63 if((vrmod_env = getenv("VR_MODULE"))) {
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64 vr_use_module_named(vrmod_env);
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65 } else {
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66 vr_use_module(0);
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67 }
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68 return 0;
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69 }
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70
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71 void vr_shutdown(void)
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72 {
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73 vr_clear_modules();
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74 vrm = 0;
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75 fbtex_rect[0] = fbtex_rect[1] = 0;
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76 fbtex_rect[2] = fbtex_rect[3] = 1;
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77 }
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78
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79 int vr_module_count(void)
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80 {
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81 return vr_get_num_active_modules();
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82 }
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83
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84 const char *vr_module_name(int idx)
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85 {
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86 struct vr_module *m = vr_get_active_module(idx);
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87 if(!m) {
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88 return 0;
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89 }
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90 return m->name;
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91 }
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92
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93 int vr_use_module(int idx)
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94 {
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95 if(idx >= 0 && idx < vr_get_num_active_modules()) {
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96 struct vr_module *m = vr_get_active_module(idx);
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97 if(m != vrm) {
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98 vrm = m;
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99 printf("using vr module: %s\n", vrm->name);
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100 }
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101 return 0;
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102 }
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103 return -1;
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104 }
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105
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106 int vr_use_module_named(const char *name)
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107 {
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108 int i, count = vr_get_num_active_modules();
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109
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110 for(i=0; i<count; i++) {
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111 struct vr_module *m = vr_get_active_module(i);
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112 if(strcmp(m->name, name) == 0) {
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113 return vr_use_module(i);
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114 }
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115 }
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116 return -1;
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117 }
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118
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119 void vr_seti(const char *optname, int val)
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120 {
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121 if(vrm && vrm->set_option) {
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122 vrm->set_option(optname, OTYPE_INT, &val);
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123 } else {
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124 set_option_int(defopt, optname, val);
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125 }
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126 }
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127
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128 void vr_setf(const char *optname, float val)
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129 {
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130 if(vrm && vrm->set_option) {
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131 vrm->set_option(optname, OTYPE_FLOAT, &val);
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132 } else {
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133 set_option_float(defopt, optname, val);
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134 }
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135 }
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136
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137 static int def_option_int(const char *optname)
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138 {
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139 int res = 0;
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140 int left, right;
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141
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142 if(strcmp(optname, VR_RENDER_XRES) == 0) {
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143 if(vrm && vrm->get_option && vrm->get_option(optname, OTYPE_INT, &left) != -1 &&
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144 vrm->get_option(optname, OTYPE_INT, &right) != -1) {
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145 return left + right;
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146 }
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147 } else if(strcmp(optname, VR_RENDER_YRES) == 0) {
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148 if(vrm && vrm->get_option && vrm->get_option(optname, OTYPE_INT, &left) != -1 &&
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149 vrm->get_option(optname, OTYPE_INT, &right) != -1) {
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150 return left > right ? left : right;
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151 }
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152 }
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153
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154 get_option_int(defopt, optname, &res);
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155 return res;
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156 }
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157
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158 static float def_option_float(const char *optname)
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159 {
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160 int res = 0;
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161
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162 if(strcmp(optname, VR_RENDER_XRES) == 0 || strcmp(optname, VR_RENDER_YRES) == 0) {
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163 return (float)def_option_int(optname);
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164 }
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165
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166 get_option_float(defopt, optname, &res);
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167 return res;
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168 }
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169
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170 int vr_geti(const char *optname)
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171 {
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172 int res = 0;
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173
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174 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {
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175 res = def_option_int(optname);
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176 }
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177 return res;
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178 }
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179
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180 float vr_getf(const char *optname)
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181 {
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182 float res = 0.0f;
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183
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184 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {
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185 res = def_option_float(optname);
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186 }
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187 return res;
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188 }
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189
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190 int vr_geti_def(const char *optname, int def_val)
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191 {
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192 int res = 0;
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193
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194 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_INT, &res) == -1) {
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195 if(get_option_int(defopt, optname, &res) == -1) { /* fallback */
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196 return def_val;
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197 }
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198 }
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199 return res;
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200 }
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201
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202 float vr_getf_def(const char *optname, float def_val)
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203 {
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204 float res = 0.0f;
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205
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206 if(!vrm || !vrm->get_option || vrm->get_option(optname, OTYPE_FLOAT, &res) == -1) {
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207 if(get_option_float(defopt, optname, &res) == -1) { /* fallback */
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208 return def_val;
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209 }
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210 }
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211 return res;
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212 }
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213
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214 int vr_view_translation(int eye, float *vec)
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215 {
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216 if(vrm && vrm->translation) {
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217 vrm->translation(eye, vec);
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218 return 1;
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219 }
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220 vec[0] = vec[1] = vec[2] = 0.0f;
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221 return 0;
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222 }
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223
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224 int vr_view_rotation(int eye, float *quat)
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225 {
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226 if(vrm && vrm->rotation) {
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227 vrm->rotation(eye, quat);
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228 return 1;
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229 }
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230 quat[0] = quat[1] = quat[2] = 0.0f;
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231 quat[3] = 1.0f;
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232 return 0;
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233 }
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234
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235 int vr_view_matrix(int eye, float *mat)
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236 {
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237 int have_trans, have_rot;
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238 float offs[3], quat[4];
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239 float rmat[16], tmat[16];
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240
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241 if(vrm && vrm->view_matrix) {
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242 vrm->view_matrix(eye, mat);
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243 return 1;
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244 }
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245
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246 have_trans = vr_view_translation(eye, offs);
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247 have_rot = vr_view_rotation(eye, quat);
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248
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249 if(!have_trans && !have_rot) {
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250 memcpy(mat, idmat, sizeof idmat);
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251 return 0;
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252 }
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253
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254 offs[0] = -offs[0];
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255 offs[1] = -offs[1];
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256 offs[2] = -offs[2];
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257
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258 vrimp_translation_matrix(offs, tmat);
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259 vrimp_rotation_matrix(quat, rmat);
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260 vrimp_mult_matrix(mat, tmat, rmat);
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261 return 1;
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262 }
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263
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264 int vr_proj_matrix(int eye, float znear, float zfar, float *mat)
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265 {
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266 if(vrm && vrm->proj_matrix) {
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267 vrm->proj_matrix(eye, znear, zfar, mat);
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268 return 1;
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269 }
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270 memcpy(mat, idmat, sizeof idmat);
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271 return 0;
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272 }
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273
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274 void vr_begin(int eye)
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275 {
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276 if(vrm && vrm->begin) {
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277 vrm->begin(eye);
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278 }
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279 }
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280
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281 void vr_end(void)
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282 {
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283 if(vrm && vrm->end) {
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284 vrm->end();
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285 }
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286 }
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287
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288 int vr_swap_buffers(void)
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289 {
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290 int res = 0;
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291
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292 if(vrm && vrm->present) {
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293 res = vrm->present();
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294 }
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295
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296 if(!res) {
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297 fallback_present();
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298 vrimp_swap_buffers();
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299 }
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300 return 0;
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301 }
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302
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303 void vr_output_texture(unsigned int tex, float umin, float vmin, float umax, float vmax)
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304 {
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305 float halfu = (umax + umin) * 0.5f;
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306
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307 vr_output_texture_eye(VR_EYE_LEFT, tex, umin, vmin, halfu, vmax);
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308 vr_output_texture_eye(VR_EYE_RIGHT, tex, halfu, vmin, umax, vmax);
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309 }
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310
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311 void vr_output_texture_eye(int eye, unsigned int tex, float umin, float vmin, float umax, float vmax)
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312 {
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313 if(vrm && vrm->set_eye_texture) {
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314 vrm->set_eye_texture(eye, tex, umin, vmin, umax, vmax);
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315 } else {
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316 rtarg[eye].tex = tex;
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317 rtarg[eye].umin = umin;
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318 rtarg[eye].umax = umax;
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319 rtarg[eye].vmin = vmin;
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320 rtarg[eye].vmax = vmax;
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321 }
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322 }
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323
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324 void vr_recenter(void)
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325 {
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326 if(vrm && vrm->recenter) {
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327 vrm->recenter();
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328 }
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329 }
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330
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331 static void fallback_present(void)
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332 {
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333 int i;
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334
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335 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT);
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336
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337 glDisable(GL_LIGHTING);
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338 glDisable(GL_DEPTH_TEST);
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339 glDisable(GL_ALPHA_TEST);
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340 glDisable(GL_STENCIL_TEST);
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341 glDisable(GL_FOG);
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342
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343 glEnable(GL_TEXTURE_2D);
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344
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345 glMatrixMode(GL_MODELVIEW);
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346 glPushMatrix();
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347 glLoadIdentity();
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348 glMatrixMode(GL_PROJECTION);
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349 glPushMatrix();
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350 glLoadIdentity();
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351
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352 for(i=0; i<2; i++) {
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353 float x0 = i == 0 ? -1 : 0;
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354 float x1 = i == 0 ? 0 : 1;
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355
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356 glBindTexture(GL_TEXTURE_2D, rtarg[i].tex);
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357
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358 glBegin(GL_QUADS);
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359 glTexCoord2f(rtarg[i].umin, rtarg[i].vmin);
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360 glVertex2f(x0, -1);
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361 glTexCoord2f(rtarg[i].umax, rtarg[i].vmin);
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362 glVertex2f(x1, -1);
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363 glTexCoord2f(rtarg[i].umax, rtarg[i].vmax);
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364 glVertex2f(x1, 1);
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365 glTexCoord2f(rtarg[i].umin, rtarg[i].vmax);
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366 glVertex2f(x0, 1);
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367 glEnd();
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368 }
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369
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370 glPopMatrix();
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371 glMatrixMode(GL_MODELVIEW);
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372 glPopMatrix();
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373
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374 glPopAttrib();
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375 }
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