colormaterial.html

来自「计算机图形学～想必是很多人需要的～在此共享一下」· HTML 代码 · 共 111 行

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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>glColorMaterial</STRONG> - cause a material color to track the	  current color     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>	  void <STRONG>glColorMaterial</STRONG>(	GLenum <EM>face</EM>,				GLenum <EM>mode</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>face</EM>	Specifies whether front, back, or both front and back		material parameters should track the current color.		Accepted values	are <STRONG>GL_FRONT</STRONG>, <STRONG>GL_BACK</STRONG>, and		<STRONG>GL_FRONT_AND_BACK</STRONG>.  The	initial	value is		<STRONG>GL_FRONT_AND_BACK</STRONG>.	  <EM>mode</EM>	Specifies which	of several material parameters track		the current color.  Accepted values are	<STRONG>GL_EMISSION</STRONG>,		<STRONG>GL_AMBIENT</STRONG>, <STRONG>GL_DIFFUSE</STRONG>,	<STRONG>GL_SPECULAR</STRONG>, and		<STRONG>GL_AMBIENT_AND_DIFFUSE</STRONG>.	 The initial value is		<STRONG>GL_AMBIENT_AND_DIFFUSE</STRONG>.     <STRONG>DESCRIPTION</STRONG>	  <STRONG>glColorMaterial</STRONG> specifies which material parameters track	  the current color.  When <STRONG>GL_COLOR_MATERIAL</STRONG> is	enabled, the	  material parameter or	parameters specified by	<EM>mode</EM>, of the	  material or materials	specified by <EM>face</EM>, track the current	  color	at all times.	  To enable and	disable	<STRONG>GL_COLOR_MATERIAL</STRONG>, call	<STRONG>glEnable</STRONG> and	  <STRONG>glDisable</STRONG> with argument <STRONG>GL_COLOR_MATERIAL</STRONG>.	  <STRONG>GL_COLOR_MATERIAL</STRONG> is initially disabled.     <STRONG>NOTES</STRONG>	  <STRONG>glColorMaterial</STRONG> makes	it possible to change a	subset of	  material parameters for each vertex using only the <STRONG>glColor</STRONG>	  command, without calling <STRONG>glMaterial</STRONG>.	If only	such a subset	  of parameters	is to be specified for each vertex, calling	  <STRONG>glColorMaterial</STRONG> is preferable	to calling <STRONG>glMaterial</STRONG>.	  Call <STRONG>glColorMaterial</STRONG> before enabling <STRONG>GL_COLOR_MATERIAL</STRONG>.	  Calling <STRONG>glDrawElements</STRONG> may leave the current color	  indeterminate.  If <STRONG>glColorMaterial</STRONG> is	enabled	while the	  current color	is indeterminate, the lighting material	state	  specified by <EM>face</EM> and	<EM>mode</EM> is	also indeterminate.	  If the GL version is 1.1 or greater, and <STRONG>GL_COLOR_MATERIAL</STRONG>	  is enabled, evaluated	color values affect the	results	of the	  lighting equation as if the current color were being	  modified, but	no change is made to the tracking lighting	  parameter of the current color.     <STRONG>ERRORS</STRONG>	  <STRONG>GL_INVALID_ENUM</STRONG> is generated if <EM>face</EM> or <EM>mode</EM> is not an	  accepted value.	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glColorMaterial</STRONG> is	  executed between the execution of <STRONG>glBegin</STRONG> and	the	  corresponding	execution of <STRONG>glEnd</STRONG>.     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>	  <STRONG>glIsEnabled</STRONG> with argument <STRONG>GL_COLOR_MATERIAL</STRONG>	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_COLOR_MATERIAL_PARAMETER</STRONG>	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_COLOR_MATERIAL_FACE</STRONG>     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>glColor</STRONG>, <STRONG>glColorPointer</STRONG>, <STRONG>glDrawElements</STRONG>, <STRONG>glEnable</STRONG>, <STRONG>glLight</STRONG>,	  <STRONG>glLightModel</STRONG>,	<STRONG>glMaterial</STRONG></PRE></BODY></HTML>

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