Gldrawpixels - HP b2600 Reference Manual

glDrawPixels

glDrawPixels: write a block of pixels to the frame buffer.
C Specification
void glDrawPixels(
Parameters
width, height
format
type
pixels
Description
glDrawPixels reads pixel data from memory and writes it into the frame buffer relative
to the current raster position. Use glRasterPos to set the current raster position; use
glGet with argument GL_CURRENT_RASTER_POSITION to query the raster position.
Several parameters define the encoding of pixel data in memory and control the
processing of the pixel data before it is placed in the frame buffer. These parameters are
set with four commands: glPixelStore, glPixelTransfer, glPixelMap, and glPixelZoom.
This reference page describes the effects on glDrawPixels of many, but not all, of the
parameters specified by these four commands.
Data is read from pixels as a sequence of signed or unsigned bytes, signed or unsigned
shorts, signed or unsigned integers, or single-precision floating-point values, depending
on type. Each of these bytes, shorts, integers, or floating-point values is interpreted as
one color or depth component, or one index, depending on format. Indices are always
treated individually. Color components are treated as groups of one, two, three, or four
values, again based on format. Both individual indices and groups of components are
referred to as pixels. If type is GL_BITMAP, the data must be unsigned bytes, and format
must be either GL_COLOR_INDEX or GL_STENCIL_INDEX. Each unsigned byte is
treated as eight 1-bit pixels, with bit ordering determined by GL_UNPACK_LSB_FIRST
(see glPixelStore).
Chapter 4
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
const GLvoid *pixels)
Specify the dimensions of the pixel rectangle to be written into the
frame buffer.
Specifies the format of the pixel data. Symbolic constants
GL_COLOR_INDEX, GL_STENCIL_INDEX,
GL_DEPTH_COMPONENT, GL_RGBA, GL_RED, GL_GREEN,
GL_BLUE, GL_ALPHA, GL_RGB, GL_LUMINANCE, and
GL_LUMINANCE_ALPHA are accepted.
Specifies the data type for pixels. Symbolic constants
GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP,
GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT,
GL_INT, and GL_FLOAT are accepted.
Specifies a pointer to the pixel data.
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glDrawPixels
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