Name
glColor — set the current color
C Specification
void glColor3b( | GLbyte | red, |
| | GLbyte | green, |
| | GLbyte | blue); |
void glColor3s( | GLshort | red, |
| | GLshort | green, |
| | GLshort | blue); |
void glColor3i( | GLint | red, |
| | GLint | green, |
| | GLint | blue); |
void glColor3f( | GLfloat | red, |
| | GLfloat | green, |
| | GLfloat | blue); |
void glColor3d( | GLdouble | red, |
| | GLdouble | green, |
| | GLdouble | blue); |
void glColor3ub( | GLubyte | red, |
| | GLubyte | green, |
| | GLubyte | blue); |
void glColor3us( | GLushort | red, |
| | GLushort | green, |
| | GLushort | blue); |
void glColor3ui( | GLuint | red, |
| | GLuint | green, |
| | GLuint | blue); |
void glColor4b( | GLbyte | red, |
| | GLbyte | green, |
| | GLbyte | blue, |
| | GLbyte | alpha); |
void glColor4s( | GLshort | red, |
| | GLshort | green, |
| | GLshort | blue, |
| | GLshort | alpha); |
void glColor4i( | GLint | red, |
| | GLint | green, |
| | GLint | blue, |
| | GLint | alpha); |
void glColor4f( | GLfloat | red, |
| | GLfloat | green, |
| | GLfloat | blue, |
| | GLfloat | alpha); |
void glColor4d( | GLdouble | red, |
| | GLdouble | green, |
| | GLdouble | blue, |
| | GLdouble | alpha); |
void glColor4ub( | GLubyte | red, |
| | GLubyte | green, |
| | GLubyte | blue, |
| | GLubyte | alpha); |
void glColor4us( | GLushort | red, |
| | GLushort | green, |
| | GLushort | blue, |
| | GLushort | alpha); |
void glColor4ui( | GLuint | red, |
| | GLuint | green, |
| | GLuint | blue, |
| | GLuint | alpha); |
Parameters
red, green, blue
Specify new red, green, and blue values for the current color.
alpha
Specifies a new alpha value for the current color.
Included only in the four-argument glColor4 commands.
C Specification
void glColor3bv( | const GLbyte * | v); |
void glColor3sv( | const GLshort * | v); |
void glColor3iv( | const GLint * | v); |
void glColor3fv( | const GLfloat * | v); |
void glColor3dv( | const GLdouble * | v); |
void glColor3ubv( | const GLubyte * | v); |
void glColor3usv( | const GLushort * | v); |
void glColor3uiv( | const GLuint * | v); |
void glColor4bv( | const GLbyte * | v); |
void glColor4sv( | const GLshort * | v); |
void glColor4iv( | const GLint * | v); |
void glColor4fv( | const GLfloat * | v); |
void glColor4dv( | const GLdouble * | v); |
void glColor4ubv( | const GLubyte * | v); |
void glColor4usv( | const GLushort * | v); |
void glColor4uiv( | const GLuint * | v); |
Parameters
v
Specifies a pointer to an array that contains red, green, blue,
and (sometimes) alpha values.
Description
The GL stores both a current single-valued color index
and a current four-valued RGBA color.
glColor sets a new four-valued RGBA color.
glColor has two major variants:
glColor3 and glColor4.
glColor3 variants specify new red,
green,
and blue values explicitly
and set the current alpha value to 1.0 (full intensity) implicitly.
glColor4 variants specify all four color components explicitly.
glColor3b, glColor4b,
glColor3s, glColor4s, glColor3i, and glColor4i take
three or four signed byte, short, or long integers as arguments.
When v is appended to the name,
the color commands can take a pointer to an array of such values.
Current color values are stored in floating-point format,
with unspecified mantissa and exponent sizes.
Unsigned integer color components,
when specified,
are linearly mapped to floating-point values such that the largest
representable value maps to 1.0 (full intensity),
and 0 maps to 0.0 (zero intensity).
Signed integer color components,
when specified,
are linearly mapped to floating-point values such that the most positive
representable value maps to 1.0,
and the most negative representable value maps to
-1.0
.
(Note that
this mapping does not convert 0 precisely to 0.0.)
Floating-point values are mapped directly.
Neither floating-point nor signed integer values are clamped
to the range
0
1
before the current color is updated.
However,
color components are clamped to this range before they are interpolated
or written into a color buffer.
Notes
The initial value for the current color is (1, 1, 1, 1).
The current color can be updated at any time.
In particular,
glColor can be called between a call to glBegin and the corresponding
call to glEnd.
Associated Gets
glGet with argument GL_CURRENT_COLOR
glGet with argument GL_RGBA_MODE
Copyright
Copyright © 1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
