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GLBufferAttribute.html

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  1. <!DOCTYPE html>
    2. 

  2. <html lang="en">
    3. 

  3. <head>
    4. 

  4. 	<meta charset="utf-8">
    5. 

  5. 	<title>GLBufferAttribute - Three.js Docs</title>
    6. 

  6. 	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    7. 

  7. 	<script src="../scripts/highlight.min.js"></script>
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  8. 	<link type="text/css" rel="stylesheet" href="../styles/highlight-three.css">
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  10. </head>
    11. 

  11. <body>
    12. 

  12. 	<h1 translate="no">GLBufferAttribute</h1>
    13. 

  13. 		<section>
    14. 

  14. 			<header>
    15. 

  15. 				<div class="class-description"><p>An alternative version of a buffer attribute with more control over the VBO.</p>
    16. 

  16. <p>The renderer does not construct a VBO for this kind of attribute. Instead, it uses
    17. 

  17. whatever VBO is passed in constructor and can later be altered via the <code>buffer</code> property.</p>
    18. 

  18. <p>The most common use case for this class is when some kind of GPGPU calculation interferes
    19. 

  19. or even produces the VBOs in question.</p>
    20. 

  20. <p>Notice that this class can only be used with <a href="WebGLRenderer.html">WebGLRenderer</a>.</p></div>
    21. 

  21. 			</header>
    22. 

  22. 			<article>
    23. 

  23. 				<div class="container-overview">
    24. 

  24. 					<h2>Constructor</h2>
    25. 

  25. 					<h3 class="name name-method" id="GLBufferAttribute" translate="no">new <a href="#GLBufferAttribute">GLBufferAttribute</a><span class="signature">( buffer : <span class="param-type">WebGLBuffer</span>, type : <span class="param-type">number</span>, itemSize : <span class="param-type">number</span>, elementSize : <span class="param-type">number</span>, count : <span class="param-type">number</span>, normalized : <span class="param-type">boolean</span> )</span> </h3>
    26. 

  26. 					<div class="method">
    27. 

  27. 						<div class="description">
    28. 

  28. 							<p>Constructs a new GL buffer attribute.</p>
    29. 

  29. 						</div>
    30. 

  30. 						<table class="params">
    31. 

  31. 							<tbody>
    32. 

  32. 								<tr>
    33. 

  33. 									<td class="name">
    34. 

  34. 										<strong>buffer</strong>
    35. 

  35. 									</td>
    36. 

  36. 									<td class="description last">
    37. 

  37. 										<p>The native WebGL buffer.</p>
    38. 

  38. 									</td>
    39. 

  39. 								</tr>
    40. 

  40. 								<tr>
    41. 

  41. 									<td class="name">
    42. 

  42. 										<strong>type</strong>
    43. 

  43. 									</td>
    44. 

  44. 									<td class="description last">
    45. 

  45. 										<p>The native data type (e.g. <code>gl.FLOAT</code>).</p>
    46. 

  46. 									</td>
    47. 

  47. 								</tr>
    48. 

  48. 								<tr>
    49. 

  49. 									<td class="name">
    50. 

  50. 										<strong>itemSize</strong>
    51. 

  51. 									</td>
    52. 

  52. 									<td class="description last">
    53. 

  53. 										<p>The item size.</p>
    54. 

  54. 									</td>
    55. 

  55. 								</tr>
    56. 

  56. 								<tr>
    57. 

  57. 									<td class="name">
    58. 

  58. 										<strong>elementSize</strong>
    59. 

  59. 									</td>
    60. 

  60. 									<td class="description last">
    61. 

  61. 										<p>The corresponding size (in bytes) for the given <code>type</code> parameter.</p>
    62. 

  62. 									</td>
    63. 

  63. 								</tr>
    64. 

  64. 								<tr>
    65. 

  65. 									<td class="name">
    66. 

  66. 										<strong>count</strong>
    67. 

  67. 									</td>
    68. 

  68. 									<td class="description last">
    69. 

  69. 										<p>The expected number of vertices in VBO.</p>
    70. 

  70. 									</td>
    71. 

  71. 								</tr>
    72. 

  72. 								<tr>
    73. 

  73. 									<td class="name">
    74. 

  74. 										<strong>normalized</strong>
    75. 

  75. 									</td>
    76. 

  76. 									<td class="description last">
    77. 

  77. 										<p>Whether the data are normalized or not.</p>
    78. 

  78. 										<p>Default is <code>false</code>.</p>
    79. 

  79. 									</td>
    80. 

  80. 								</tr>
    81. 

  81. 							</tbody>
    82. 

  82. 						</table>
    83. 

  83. 					</div>
    84. 

  84. 				</div>
    85. 

  85. 				<h2 class="subsection-title">Properties</h2>
    86. 

  86. 				<div class="member">
    87. 

  87. 					<h3 class="name" id="buffer" translate="no">.<a href="#buffer">buffer</a><span class="type-signature"> : WebGLBuffer</span> </h3>
    88. 

  88. 					<div class="description">
    89. 

  89. 						<p>The native WebGL buffer.</p>
    90. 

  90. 					</div>
    91. 

  91. 				</div>
    92. 

  92. 				<div class="member">
    93. 

  93. 					<h3 class="name" id="count" translate="no">.<a href="#count">count</a><span class="type-signature"> : number</span> </h3>
    94. 

  94. 					<div class="description">
    95. 

  95. 						<p>The expected number of vertices in VBO.</p>
    96. 

  96. 					</div>
    97. 

  97. 				</div>
    98. 

  98. 				<div class="member">
    99. 

  99. 					<h3 class="name" id="elementSize" translate="no">.<a href="#elementSize">elementSize</a><span class="type-signature"> : number</span> </h3>
    100. 

  100. 					<div class="description">
    101. 

  101. 						<p>The corresponding size (in bytes) for the given <code>type</code> parameter.</p>
    102. 

  102. 					</div>
    103. 

  103. 				</div>
    104. 

  104. 				<div class="member">
    105. 

  105. 					<h3 class="name" id="isGLBufferAttribute" translate="no">.<a href="#isGLBufferAttribute">isGLBufferAttribute</a><span class="type-signature"> : boolean</span> <span class="type-signature">(readonly) </span></h3>
    106. 

  106. 					<div class="description">
    107. 

  107. 						<p>This flag can be used for type testing.</p>
    108. 

  108. 						<p>Default is <code>true</code>.</p>
    109. 

  109. 					</div>
    110. 

  110. 				</div>
    111. 

  111. 				<div class="member">
    112. 

  112. 					<h3 class="name" id="itemSize" translate="no">.<a href="#itemSize">itemSize</a><span class="type-signature"> : number</span> </h3>
    113. 

  113. 					<div class="description">
    114. 

  114. 						<p>The item size, see <a href="BufferAttribute.html#itemSize">BufferAttribute#itemSize</a>.</p>
    115. 

  115. 					</div>
    116. 

  116. 				</div>
    117. 

  117. 				<div class="member">
    118. 

  118. 					<h3 class="name" id="name" translate="no">.<a href="#name">name</a><span class="type-signature"> : string</span> </h3>
    119. 

  119. 					<div class="description">
    120. 

  120. 						<p>The name of the buffer attribute.</p>
    121. 

  121. 					</div>
    122. 

  122. 				</div>
    123. 

  123. 				<div class="member">
    124. 

  124. 					<h3 class="name" id="needsUpdate" translate="no">.<a href="#needsUpdate">needsUpdate</a><span class="type-signature"> : number</span> </h3>
    125. 

  125. 					<div class="description">
    126. 

  126. 						<p>Flag to indicate that this attribute has changed and should be re-sent to
    127. 

  127. the GPU. Set this to <code>true</code> when you modify the value of the array.</p>
    128. 

  128. 						<p>Default is <code>false</code>.</p>
    129. 

  129. 					</div>
    130. 

  130. 				</div>
    131. 

  131. 				<div class="member">
    132. 

  132. 					<h3 class="name" id="normalized" translate="no">.<a href="#normalized">normalized</a><span class="type-signature"> : boolean</span> </h3>
    133. 

  133. 					<div class="description">
    134. 

  134. 						<p>Applies to integer data only. Indicates how the underlying data in the buffer maps to
    135. 

  135. the values in the GLSL code. For instance, if <code>buffer</code> contains data of <code>gl.UNSIGNED_SHORT</code>,
    136. 

  136. and <code>normalized</code> is <code>true</code>, the values <code>0 - +65535</code> in the buffer data will be mapped to
    137. 

  137. <code>0.0f - +1.0f</code> in the GLSL attribute. If <code>normalized</code> is <code>false</code>, the values will be converted
    138. 

  138. to floats unmodified, i.e. <code>65535</code> becomes <code>65535.0f</code>.</p>
    139. 

  139. 					</div>
    140. 

  140. 				</div>
    141. 

  141. 				<div class="member">
    142. 

  142. 					<h3 class="name" id="type" translate="no">.<a href="#type">type</a><span class="type-signature"> : number</span> </h3>
    143. 

  143. 					<div class="description">
    144. 

  144. 						<p>The native data type.</p>
    145. 

  145. 					</div>
    146. 

  146. 				</div>
    147. 

  147. 				<div class="member">
    148. 

  148. 					<h3 class="name" id="version" translate="no">.<a href="#version">version</a><span class="type-signature"> : number</span> </h3>
    149. 

  149. 					<div class="description">
    150. 

  150. 						<p>A version number, incremented every time the <code>needsUpdate</code> is set to <code>true</code>.</p>
    151. 

  151. 					</div>
    152. 

  152. 				</div>
    153. 

  153. 				<h2 class="subsection-title">Methods</h2>
    154. 

  154. 					<h3 class="name name-method" id="setBuffer" translate="no">.<a href="#setBuffer">setBuffer</a><span class="signature">( buffer : <span class="param-type">WebGLBuffer</span> )</span><span class="type-signature"> : <a href="BufferAttribute.html">BufferAttribute</a></span> </h3>
    155. 

  155. 					<div class="method">
    156. 

  156. 						<div class="description">
    157. 

  157. 							<p>Sets the given native WebGL buffer.</p>
    158. 

  158. 						</div>
    159. 

  159. 						<table class="params">
    160. 

  160. 							<tbody>
    161. 

  161. 								<tr>
    162. 

  162. 									<td class="name">
    163. 

  163. 										<strong>buffer</strong>
    164. 

  164. 									</td>
    165. 

  165. 									<td class="description last">
    166. 

  166. 										<p>The buffer to set.</p>
    167. 

  167. 									</td>
    168. 

  168. 								</tr>
    169. 

  169. 							</tbody>
    170. 

  170. 						</table>
    171. 

  171. 						<dl class="details">
    172. 

  172. 							<dt class="tag-returns"><strong>Returns:</strong> A reference to this instance.</dt>
    173. 

  173. 						</dl>
    174. 

  174. 					</div>
    175. 

  175. 					<h3 class="name name-method" id="setCount" translate="no">.<a href="#setCount">setCount</a><span class="signature">( count : <span class="param-type">number</span> )</span><span class="type-signature"> : <a href="BufferAttribute.html">BufferAttribute</a></span> </h3>
    176. 

  176. 					<div class="method">
    177. 

  177. 						<div class="description">
    178. 

  178. 							<p>Sets the count (the expected number of vertices in VBO).</p>
    179. 

  179. 						</div>
    180. 

  180. 						<table class="params">
    181. 

  181. 							<tbody>
    182. 

  182. 								<tr>
    183. 

  183. 									<td class="name">
    184. 

  184. 										<strong>count</strong>
    185. 

  185. 									</td>
    186. 

  186. 									<td class="description last">
    187. 

  187. 										<p>The count.</p>
    188. 

  188. 									</td>
    189. 

  189. 								</tr>
    190. 

  190. 							</tbody>
    191. 

  191. 						</table>
    192. 

  192. 						<dl class="details">
    193. 

  193. 							<dt class="tag-returns"><strong>Returns:</strong> A reference to this instance.</dt>
    194. 

  194. 						</dl>
    195. 

  195. 					</div>
    196. 

  196. 					<h3 class="name name-method" id="setItemSize" translate="no">.<a href="#setItemSize">setItemSize</a><span class="signature">( itemSize : <span class="param-type">number</span> )</span><span class="type-signature"> : <a href="BufferAttribute.html">BufferAttribute</a></span> </h3>
    197. 

  197. 					<div class="method">
    198. 

  198. 						<div class="description">
    199. 

  199. 							<p>Sets the item size.</p>
    200. 

  200. 						</div>
    201. 

  201. 						<table class="params">
    202. 

  202. 							<tbody>
    203. 

  203. 								<tr>
    204. 

  204. 									<td class="name">
    205. 

  205. 										<strong>itemSize</strong>
    206. 

  206. 									</td>
    207. 

  207. 									<td class="description last">
    208. 

  208. 										<p>The item size.</p>
    209. 

  209. 									</td>
    210. 

  210. 								</tr>
    211. 

  211. 							</tbody>
    212. 

  212. 						</table>
    213. 

  213. 						<dl class="details">
    214. 

  214. 							<dt class="tag-returns"><strong>Returns:</strong> A reference to this instance.</dt>
    215. 

  215. 						</dl>
    216. 

  216. 					</div>
    217. 

  217. 					<h3 class="name name-method" id="setType" translate="no">.<a href="#setType">setType</a><span class="signature">( type : <span class="param-type">number</span>, elementSize : <span class="param-type">number</span> )</span><span class="type-signature"> : <a href="BufferAttribute.html">BufferAttribute</a></span> </h3>
    218. 

  218. 					<div class="method">
    219. 

  219. 						<div class="description">
    220. 

  220. 							<p>Sets the given native data type and element size.</p>
    221. 

  221. 						</div>
    222. 

  222. 						<table class="params">
    223. 

  223. 							<tbody>
    224. 

  224. 								<tr>
    225. 

  225. 									<td class="name">
    226. 

  226. 										<strong>type</strong>
    227. 

  227. 									</td>
    228. 

  228. 									<td class="description last">
    229. 

  229. 										<p>The native data type (e.g. <code>gl.FLOAT</code>).</p>
    230. 

  230. 									</td>
    231. 

  231. 								</tr>
    232. 

  232. 								<tr>
    233. 

  233. 									<td class="name">
    234. 

  234. 										<strong>elementSize</strong>
    235. 

  235. 									</td>
    236. 

  236. 									<td class="description last">
    237. 

  237. 										<p>The corresponding size (in bytes) for the given <code>type</code> parameter.</p>
    238. 

  238. 									</td>
    239. 

  239. 								</tr>
    240. 

  240. 							</tbody>
    241. 

  241. 						</table>
    242. 

  242. 						<dl class="details">
    243. 

  243. 							<dt class="tag-returns"><strong>Returns:</strong> A reference to this instance.</dt>
    244. 

  244. 						</dl>
    245. 

  245. 					</div>
    246. 

  246. 				<h2 class="subsection-title">Source</h2>
    247. 

  247. 				<p>
    248. 

  248. 					<a href="https://github.com/mrdoob/three.js/blob/master/src/core/GLBufferAttribute.js" translate="no" target="_blank" rel="noopener">src/core/GLBufferAttribute.js</a>
    249. 

  249. 				</p>
    250. 

  250. 			</article>
    251. 

  251. 		</section>
    252. 

  252. <script src="../scripts/linenumber.js"></script>
    253. 

  253. <script src="../scripts/page.js"></script>
    254. 

  254. </body>
    255. 

  255. </html>
    256.
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