author | Gareth Stockwell <gareth.stockwell@accenture.com> |
Fri, 05 Nov 2010 17:31:20 +0000 | |
branch | bug235_bringup_0 |
changeset 215 | 097e92a68d68 |
parent 0 | 5d03bc08d59c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Light manager implementation |
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* |
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*/ |
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|
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|
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/*! |
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* \internal |
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* \file |
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* \brief Light manager implementation |
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*/ |
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|
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#ifndef M3G_CORE_INCLUDE |
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# error included by m3g_core.c; do not compile separately. |
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#endif |
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|
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#include "m3g_lightmanager.h" |
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#include "m3g_light.h" |
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#include "m3g_rendercontext.h" |
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#include "m3g_math.h" |
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|
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/*! |
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* \internal |
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* \brief Light array element |
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*/ |
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typedef struct |
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{ |
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/*! \internal \brief eye space spot direction */ |
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Vec4 spotDir; |
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|
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/*! \internal \brief eye space position */ |
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Vec4 position; |
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|
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/*! \internal \brief reference to the Light node */ |
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Light *light; |
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} LightRecord; |
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|
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/*---------------------------------------------------------------------- |
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* Private functions |
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*--------------------------------------------------------------------*/ |
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|
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/*! |
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* \internal |
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* \brief Update a single light record |
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* |
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* Light position and spot direction are transformed into world space, |
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* i.e. omitting the viewing transformation which is applied by OpenGL |
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* when rendering. Both transformations are special cases and |
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* accomplished by just reading a part of the matrix. |
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* |
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* \note We need to transform the spotlight direction even if the |
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* light is not a spotlight, since in immediate mode, it may change |
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* into a spotlight later on! |
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*/ |
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static void m3gSetLightRecord(LightRecord *lrec, |
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Light *light, |
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const Matrix *tf) |
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{ |
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Vec4 v; |
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M3G_ASSIGN_REF(lrec->light, light); |
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|
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if (tf != NULL) { |
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m3gGetMatrixColumn(tf, 3, &lrec->position); |
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m3gGetMatrixColumn(tf, 2, &v); |
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lrec->spotDir.x = -v.x; |
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lrec->spotDir.y = -v.y; |
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lrec->spotDir.z = -v.z; |
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lrec->spotDir.w = 0.0f; |
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} |
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else { |
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lrec->spotDir.x = lrec->spotDir.y = lrec->spotDir.w = 0.0f; |
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lrec->spotDir.z = -1.0f; |
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lrec->position.x = lrec->position.y = lrec->position.z = 0.0f; |
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lrec->position.w = 1.0f; |
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} |
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} |
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|
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/*---------------------------------------------------------------------- |
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* Internal functions |
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*--------------------------------------------------------------------*/ |
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|
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/*! |
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* \internal |
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* \brief Clears all lights in the current pool of lights |
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*/ |
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static void m3gClearLights2(LightManager *mgr) |
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{ |
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LightRecord *lrec; |
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PointerArray *lights; |
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int i, n; |
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M3G_ASSERT_PTR(mgr); |
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|
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105 |
lights = &mgr->lights; |
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106 |
n = m3gArraySize(lights); |
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|
107 |
for (i = 0; i < n; ++i) { |
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|
108 |
lrec = m3gGetArrayElement(lights, i); |
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109 |
M3G_ASSIGN_REF(lrec->light, NULL); |
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110 |
} |
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111 |
|
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mgr->numActive = 0; |
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113 |
} |
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114 |
|
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115 |
/*! |
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116 |
* \internal |
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117 |
* \brief Destroys the light manager, freeing allocated resources |
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118 |
*/ |
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119 |
static void m3gDestroyLightManager(LightManager *mgr, Interface *m3g) |
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120 |
{ |
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121 |
int i, n; |
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122 |
M3G_ASSERT_PTR(mgr); |
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M3G_VALIDATE_INTERFACE(m3g); |
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124 |
|
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125 |
/* First remove all light references */ |
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126 |
m3gClearLights2(mgr); |
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127 |
|
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128 |
/* Free the records currently in the light array */ |
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n = m3gArraySize(&mgr->lights); |
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130 |
for (i = 0; i < n; ++i) { |
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131 |
m3gFree(m3g, m3gGetArrayElement(&mgr->lights, i)); |
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132 |
} |
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133 |
m3gDestroyArray(&mgr->lights, m3g); |
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134 |
} |
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135 |
|
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136 |
/*! |
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137 |
* \internal |
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138 |
* \brief Appends a light at the end of the light manager array |
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139 |
*/ |
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140 |
static M3Gint m3gInsertLight(LightManager *mgr, |
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141 |
Light *light, |
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142 |
const Matrix *tf, |
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143 |
Interface *m3g) |
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144 |
{ |
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145 |
LightRecord *lrec; |
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146 |
PointerArray *lights; |
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147 |
M3Gint idx; |
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148 |
M3G_ASSERT_PTR(mgr); |
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149 |
M3G_VALIDATE_INTERFACE(m3g); |
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150 |
|
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151 |
lights = &mgr->lights; |
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152 |
|
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153 |
/* Get the first unused light record, or add a new one */ |
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154 |
|
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155 |
if (mgr->numActive < m3gArraySize(lights)) { |
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156 |
lrec = m3gGetArrayElement(lights, mgr->numActive); |
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157 |
} |
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158 |
else { |
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159 |
M3G_ASSERT(mgr->numActive == m3gArraySize(lights)); |
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160 |
lrec = m3gAllocZ(m3g, sizeof(LightRecord)); |
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161 |
if (lrec == NULL) { |
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162 |
return -1; |
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163 |
} |
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164 |
if (m3gArrayAppend(lights, lrec, m3g) == -1) { |
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165 |
return -1; |
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166 |
} |
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167 |
} |
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168 |
idx = mgr->numActive++; |
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169 |
|
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170 |
m3gSetLightRecord(lrec, light, tf); |
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171 |
return idx; |
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172 |
} |
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|
173 |
|
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174 |
/*! |
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175 |
* \internal |
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176 |
* \brief |
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177 |
*/ |
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178 |
static M3Gsizei m3gLightArraySize(const LightManager *mgr) |
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179 |
{ |
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180 |
M3G_ASSERT_PTR(mgr); |
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181 |
return mgr->numActive; |
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182 |
} |
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|
183 |
|
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184 |
/*! |
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185 |
* \internal |
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186 |
* \brief |
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187 |
*/ |
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188 |
static Light *m3gGetLightTransformInternal(const LightManager *mgr, M3Gint idx, M3GMatrix *transform) |
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189 |
{ |
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190 |
M3Gfloat matrix[16]; |
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191 |
LightRecord *lrec; |
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192 |
M3G_ASSERT_PTR(mgr); |
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193 |
M3G_ASSERT(m3gInRange(idx, 0, mgr->numActive - 1)); |
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194 |
|
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195 |
lrec = m3gGetArrayElement(&mgr->lights, idx); |
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196 |
|
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197 |
if (transform != NULL) { |
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198 |
m3gZero(matrix, sizeof(matrix)); |
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|
199 |
|
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200 |
matrix[0 * 4 + 0] = 1.f; |
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201 |
matrix[1 * 4 + 1] = 1.f; |
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|
202 |
|
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203 |
matrix[2 * 4 + 0] = -lrec->spotDir.x; |
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204 |
matrix[2 * 4 + 1] = -lrec->spotDir.y; |
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205 |
matrix[2 * 4 + 2] = -lrec->spotDir.z; |
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|
206 |
|
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|
207 |
matrix[3 * 4 + 0] = lrec->position.x; |
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208 |
matrix[3 * 4 + 1] = lrec->position.y; |
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matrix[3 * 4 + 2] = lrec->position.z; |
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matrix[3 * 4 + 3] = lrec->position.w; |
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m3gSetMatrixColumns(transform, matrix); |
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} |
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return lrec->light; |
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} |
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/*! |
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* \internal |
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* \brief Replaces an existing light in the light array |
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*/ |
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static void m3gReplaceLight(LightManager *mgr, |
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M3Gint idx, |
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Light *light, |
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const Matrix *tf) |
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{ |
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LightRecord *lrec; |
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M3G_ASSERT_PTR(mgr); |
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M3G_ASSERT(m3gInRange(idx, 0, mgr->numActive - 1)); |
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|
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lrec = m3gGetArrayElement(&mgr->lights, idx); |
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m3gSetLightRecord(lrec, light, tf); |
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} |
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|
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/*! |
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* \internal |
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* \brief Selects a set of lights from the current light array for OpenGL |
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* |
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* Selects a maximum on \c maxNum lights from the array matching the |
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* given scope, sets those into the current OpenGL context, and |
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* disables the rest of the OpenGL lights GL_LIGHT0..GL_LIGHT7. A |
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* maximum of 8 lights is ever used. |
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* |
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*/ |
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static void m3gSelectGLLights(const LightManager *mgr, |
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M3Gsizei maxNum, |
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M3Guint scope, |
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M3Gfloat x, M3Gfloat y, M3Gfloat z) |
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{ |
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const PointerArray *lights; |
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int i, required, total; |
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GLenum glIndex = GL_LIGHT0; |
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M3G_ASSERT_PTR(mgr); |
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|
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M3G_UNREF(x); |
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M3G_UNREF(y); |
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M3G_UNREF(z); |
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|
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lights = &mgr->lights; |
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required = m3gClampInt(maxNum, 0, 8); |
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total = mgr->numActive; |
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|
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/* Select the first n lights that match the scope */ |
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|
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for (i = 0; required > 0 && i < total; ++i) { |
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const LightRecord *lrec; |
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const Light *light; |
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|
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lrec = (const LightRecord *) m3gGetArrayElement(lights, i); |
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M3G_ASSERT(lrec != NULL); |
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light = lrec->light; |
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|
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if (light != NULL && (light->node.scope & scope) != 0) { |
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m3gApplyLight(light, glIndex++, &lrec->position, &lrec->spotDir); |
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--required; |
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} |
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} |
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|
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/* Disable the leftover lights */ |
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|
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while (glIndex <= GL_LIGHT7) { |
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glDisable(glIndex++); |
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} |
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} |
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|
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/*! |
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* \internal |
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* \brief Transforms all lights with the given matrix |
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*/ |
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static void m3gTransformLights(LightManager *mgr, const Matrix *mtx) |
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{ |
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const PointerArray *lights; |
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M3Gint i, n; |
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|
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lights = &mgr->lights; |
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n = mgr->numActive; |
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|
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for (i = 0; i < n; ++i) { |
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LightRecord *lrec = (LightRecord*) m3gGetArrayElement(lights, i); |
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m3gTransformVec4(mtx, &lrec->position); |
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m3gTransformVec4(mtx, &lrec->spotDir); |
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} |
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} |
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304 |