HP b2600 Reference Manual page 124

D
glDrawPixels
y
n
where (x
like the fragments generated by rasterizing points, lines, or polygons. Texture mapping,
fog, and all the fragment operations are applied before the fragments are written to the
frame buffer.
GL_RED
Each pixel is a single red component. This component is converted to the internal
floating-point format in the same way the red component of an RGBA pixel is. It is then
converted to an RGBA pixel with green and blue set to 0, and alpha set to 1. After this
conversion, the pixel is treated as if it had been read as an RGBA pixel.
GL_GREEN
Each pixel is a single green component. This component is converted to the internal
floating-point format in the same way the green component of an RGBA pixel is. It is
then converted to an RGBA pixel with red and blue set to 0, and alpha set to 1. After this
conversion, the pixel is treated as if it had been read as an RGBA pixel.
GL_BLUE
Each pixel is a single blue component. This component is converted to the internal
floating-point format in the same way the blue component of an RGBA pixel is. It is then
converted to an RGBA pixel with red and green set to 0, and alpha set to 1. After this
conversion, the pixel is treated as if it had been read as an RGBA pixel.
GL_ALPHA
Each pixel is a single alpha component. This component is converted to the internal
floating-point format in the same way the alpha component of an RGBA pixel is. It is
then converted to an RGBA pixel with red, green, and blue set to 0. After this conversion,
the pixel is treated as if it had been read as an RGBA pixel.
GL_RGB
Each pixel is a three-component group: red first, followed by green, followed by blue.
Each component is converted to the internal floating-point format in the same way the
red, green, and blue components of an RGBA pixel are. The color triple is converted to an
RGBA pixel with alpha set to 1. After this conversion, the pixel is treated as if it had
been read as an RGBA pixel.
GL_LUMINANCE
Each pixel is a single luminance component. This component is converted to the internal
floating-point format in the same way the red component of an RGBA pixel is. It is then
converted to an RGBA pixel with red, green, and blue set to the converted luminance
value, and alpha set to 1. After this conversion, the pixel is treated as if it had been read
as an RGBA pixel.
GL_LUMINANCE_ALPHA
Each pixel is a two-component group: luminance first, followed by alpha. The two
components are converted to the internal floating-point format in the same way the red
component of an RGBA pixel is. They are then converted to an RGBA pixel with red,
green, and blue set to the converted luminance value, and alpha set to the converted
alpha value. After this conversion, the pixel is treated as if it had been read as an RGBA
pixel.
124
= y + n/width
r
, y ) is the current raster position.These pixel fragments are then treated just
r r
Chapter 4