2010-2013
Khronos Group
glDepthRangeArray
3G

# glDepthRangeArray

specify mapping of depth values from normalized device coordinates to window coordinates for a specified set of viewports

## C Specification

                    void glDepthRangeArrayv
                    GLuint first
                    GLsizei count
                    const GLdouble *v

## Parameters

`first`

  Specifies the index of the first viewport whose depth range to update.

`count`

  Specifies the number of viewports whose depth range to update.

`v`

  Specifies the address of an array containing the near and far values for the depth range of each modified viewport.

## Description

After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. Each viewport has an independent depth range specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). `glDepthRangeArray` specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates for each viewport in the range [`first`, `first` + `count`). Thus, the values accepted by `glDepthRangeArray` are both clamped to this range before they are accepted.

The `first` parameter specifies the index of the first viewport whose depth range to modify and must be less than the value of `GL_MAX_VIEWPORTS`. `count` specifies the number of viewports whose depth range to modify. `first` + `count` must be less than or equal to the value of `GL_MAX_VIEWPORTS`. `v` specifies the address of an array of pairs of double precision floating point values representing the near and far values of the depth range for each viewport, in that order.

The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized.

## Notes

It is not necessary that the near plane distance be less than the far plane distance. Reverse mappings such as near = 1 , and far = 0 are acceptable.

The type of the `v` parameter was changed from GLclampd to GLdouble. This change is transparent to user code and is described in detail on the removedTypes page.

## Errors

`GL_INVALID_VALUE` is generated if `first` is greater than or equal to the value of `GL_MAX_VIEWPORTS`.

`GL_INVALID_VALUE` is generated if `first` + `count` is greater than or equal to the value of `GL_MAX_VIEWPORTS`.

## Associated Gets

glGet with argument `GL_DEPTH_RANGE`

## See Also

glDepthFunc, glDepthRange, glDepthRangeIndexed, glPolygonOffset, glViewportArray, glViewport, removedTypes

## Copyright

Copyright 2010-2013 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.