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glGet

Chapter 7

184

params returns one value, the data type of each coordinate in the vertex array. The

initial value is GL_FLOAT. See glVertexPointer.

GL_VIEWPORT

params returns four values: the x and y window coordinates of the viewport, followed by

its width and height. Initially the x and y window coordinates are both set to 0, and the

width and height are set to the width and height of the window into which the GL will do

its rendering. See glViewport.

GL_ZOOM_X

params returns one value, the x pixel zoom factor. The initial value is 1. See

glPixelZoom.

GL_ZOOM_Y

params returns one value, the y pixel zoom factor. The initial value is 1. See

glPixelZoom.

Many of the boolean parameters can also be queried more easily using glIsEnabled.

Notes

GL_COLOR_LOGIC_OP, GL_COLOR_ARRAY, GL_COLOR_ARRAY_SIZE,

GL_COLOR_ARRAY_STRIDE, GL_COLOR_ARRAY_TYPE, GL_EDGE_FLAG_ARRAY,

GL_EDGE_FLAG_ARRAY_STRIDE, GL_INDEX_ARRAY,

GL_INDEX_ARRAY_STRIDE, GL_INDEX_ARRAY_TYPE, GL_INDEX_LOGIC_OP,

GL_NORMAL_ARRAY,GL_NORMAL_ARRAY_STRIDE,GL_NORMAL_ARRAY_TYPE,

GL_POLYGON_OFFSET_UNITS, GL_POLYGON_OFFSET_FACTOR,

GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE,

GL_POLYGON_OFFSET_POINT, GL_TEXTURE_COORD_ARRAY,

GL_TEXTURE_COORD_ARRAY_SIZE, GL_TEXTURE_COORD_ARRAY_STRIDE,

GL_TEXTURE_COORD_ARRAY_TYPE, GL_VERTEX_ARRAY,

GL_VERTEX_ARRAY_SIZE, GL_VERTEX_ARRAY_STRIDE, and

GL_VERTEX_ARRAY_TYPE are available only if the GL version is 1.1 or greater.

Errors

• GL_INVALID_ENUM is generated if pname is not an accepted value.

• GL_INVALID_OPERATION is generated if glGet is executed between the execution

of glBegin and the corresponding execution of glEnd.

HP b2600 Reference Guide

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