📄 normalpointer.html

📁 计算机图形学～想必是很多人需要的～在此共享一下
💻 HTML
字号:
<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>glNormalPointer</STRONG> - define an array of normals     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>	  void <STRONG>glNormalPointer</STRONG>(	GLenum <EM>type</EM>,				GLsizei	<EM>stride</EM>,				const GLvoid *<EM>pointer</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>type</EM>	   Specifies the data type of each coordinate in the		   array. Symbolic constants <STRONG>GL_BYTE</STRONG>, <STRONG>GL_SHORT</STRONG>,		   <STRONG>GL_INT</STRONG>, <STRONG>GL_FLOAT</STRONG>, and <STRONG>GL_DOUBLE</STRONG> are accepted. The		   initial value is <STRONG>GL_FLOAT</STRONG>.	  <EM>stride</EM>   Specifies the byte offset between consecutive		   normals. If <EM>stride</EM> is 0- the	initial	value-the		   normals are understood to be	tightly	packed in the		   array.	  <EM>pointer</EM>  Specifies a pointer to the first coordinate of the		   first normal	in the array.     <STRONG>DESCRIPTION</STRONG>	  <STRONG>glNormalPointer</STRONG> specifies the	location and data format of an	  array	of normals to use when rendering.  <EM>type</EM>	specifies the	  data type of the normal coordinates and <EM>stride</EM> gives the	  byte stride from one normal to the next, allowing vertexes	  and attributes to be packed into a single array or stored in	  separate arrays.  (Single-array storage may be more	  efficient on some implementations; see <STRONG>glInterleavedArrays</STRONG>.)	  When a normal	array is specified, <EM>type</EM>, <EM>stride</EM>, and <EM>pointer</EM>	  are saved as client-side state.	  To enable and	disable	the normal array, call	  <STRONG>glEnableClientState</STRONG> and <STRONG>glDisableClientState</STRONG> with the	  argument <STRONG>GL_NORMAL_ARRAY</STRONG>. If enabled,	the normal array is	  used when <STRONG>glDrawArrays</STRONG>, <STRONG>glDrawElements</STRONG>, or <STRONG>glArrayElement</STRONG> is	  called.	  Use <STRONG>glDrawArrays</STRONG> to construct	a sequence of primitives (all	  of the same type) from prespecified vertex and vertex	  attribute arrays.  Use <STRONG>glArrayElement</STRONG>	to specify primitives	  by indexing vertexes and vertex attributes and	  <STRONG>glDrawElements</STRONG> to construct a	sequence of primitives by	  indexing vertexes and	vertex attributes.     <STRONG>NOTES</STRONG>	  <STRONG>glNormalPointer</STRONG> is available only if the GL version is 1.1	  or greater.	  The normal array is initially	disabled and isn't accessed	  when <STRONG>glArrayElement</STRONG>, <STRONG>glDrawElements</STRONG>, or <STRONG>glDrawArrays</STRONG> is	  called.	  Execution of <STRONG>glNormalPointer</STRONG> is not allowed between <STRONG>glBegin</STRONG>	  and the corresponding	<STRONG>glEnd</STRONG>, but an error may	or may not be	  generated. If	an error is not	generated, the operation is	  undefined.	  <STRONG>glNormalPointer</STRONG> is typically implemented on the client side.	  Since	the normal array parameters are	client-side state,	  they are not saved or	restored by <STRONG>glPushAttrib</STRONG> and	  <STRONG>glPopAttrib</STRONG>.	Use <STRONG>glPushClientAttrib</STRONG> and <STRONG>glPopClientAttrib</STRONG>	  instead.     <STRONG>ERRORS</STRONG>	  <STRONG>GL_INVALID_ENUM</STRONG> is generated if <EM>type</EM> is not an accepted	  value.	  <STRONG>GL_INVALID_VALUE</STRONG> is generated	if <EM>stride</EM> is negative.     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>	  <STRONG>glIsEnabled</STRONG> with argument <STRONG>GL_NORMAL_ARRAY</STRONG>	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_NORMAL_ARRAY_TYPE</STRONG>	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_NORMAL_ARRAY_STRIDE</STRONG>	  <STRONG>glGetPointerv</STRONG>	with argument <STRONG>GL_NORMAL_ARRAY_POINTER</STRONG>     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>glArrayElement</STRONG>, <STRONG>glColorPointer</STRONG>, <STRONG>glDrawArrays</STRONG>,	  <STRONG>glDrawElements</STRONG>, <STRONG>glEdgeFlagPointer</STRONG>, <STRONG>glEnable</STRONG>, <STRONG>glGetPointerv</STRONG>,	  <STRONG>glIndexPointer</STRONG>, <STRONG>glInterleavedArrays</STRONG>, <STRONG>glPopClientAttrib</STRONG>,	  <STRONG>glPushClientAttrib</STRONG>, <STRONG>glTexCoordPointer</STRONG>, <STRONG>glVertexPointer</STRONG></PRE></BODY></HTML>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -