HP b2600 Reference Guide

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glPixelTransfer
Chapter 14
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glPixelTransfer
glPixelTransferf, glPixelTransferi: set pixel transfer modes.
C Specification
void glPixelTransferf(
GLenum pname,
GLfloat param)
void glPixelTransferi(
GLenum pname,
GLint param)
Parameters
pname Specifies the symbolic name of the pixel transfer parameter to be set.
Must be one of the following: GL_MAP_COLOR, GL_MAP_STENCIL,
GL_INDEX_SHIFT, GL_INDEX_OFFSET, GL_RED_SCALE,
GL_RED_BIAS, GL_GREEN_SCALE, GL_GREEN_BIAS,
GL_BLUE_SCALE, GL_BLUE_BIAS, GL_ALPHA_SCALE,
GL_ALPHA_BIAS, GL_DEPTH_SCALE, or GL_DEPTH_BIAS.
param Specifies the value that pname is set to.
Description
glPixelTransfer sets pixel transfer modes that affect the operation of subsequent
glCopyPixels, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D,
glCopyTexSubImage2D, glDrawPixels, glReadPixels, glTexImage1D, glTexImage2D,
glTexSubImage1D, and glTexSubImage2D commands. The algorithms that are specified
by pixel transfer modes operate on pixels after they are read from the frame buffer
(glCopyPixels glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D,
glCopyTexSubImage2D, and glReadPixels), or unpacked from client memory
(glDrawPixels, glTexImage1D, glTexImage2D, glTexSubImage1D, and
glTexSubImage2D). Pixel transfer operations happen in the same order, and in the same
manner, regardless of the command that resulted in the pixel operation. Pixel storage
modes (see glPixelStore) control the unpacking of pixels being read from client memory,
and the packing of pixels being written back into client memory.
Pixel transfer operations handle four fundamental pixel types: color, color index, depth,
and stencil. Color pixels consist of four floating-point values with unspecified mantissa
and exponent sizes, scaled such that 0 represents zero intensity and 1 represents full
intensity. Color indices comprise a single fixed-point value, with unspecified precision to
the right of the binary point. Depth pixels comprise a single floating-point value, with
unspecified mantissa and exponent sizes, scaled such that 0.0 represents the minimum
depth buffer value, and 1.0 represents the maximum depth buffer value. Finally, stencil
pixels comprise a single fixed-point value, with unspecified precision to the right of the
binary point.
The pixel transfer operations performed on the four basic pixel types are as follows:
Color

HP b2600 Specifications

General

Brand	HP
Model	b2600
Category	Desktop
Language	English