GLVIEWPORTARRAY(3G) OpenGL Manual GLVIEWPORTARRAY(3G)
glViewportArray - set multiple viewports
void glViewportArrayv(GLuint first, GLsizei count, const GLfloat *v);
Specify the first viewport to set.
Specify the number of viewports to set.
Specify the address of an array containing the viewport parameters.
glViewportArrayv specifies the parameters for multiple viewports simulataneously. first
specifies the index of the first viewport to modify and count specifies the number of
viewports to modify. first must be less than the value of GL_MAX_VIEWPORTS, and first +
count must be less than or equal to the value of GL_MAX_VIEWPORTS. Viewports whose indices
lie outside the range [first, first + count) are not modified. v contains the address of
an array of floating point values specifying the left (x), bottom (y), width (w), and
height (h) of each viewport, in that order. x and y give the location of the viewport's
lower left corner, and w and h give the width and height of the viewport, respectively.
The viewport specifies the affine transformation of x and y from normalized device
coordinates to window coordinates. Let x nd y nd be normalized device coordinates. Then
the window coordinates x w y w are computed as follows:
x w = x nd + 1 width 2 + x
y w = y nd + 1 height 2 + y
The location of the viewport's bottom left corner, given by (x, y) is clamped to be within
the implementaiton-dependent viewport bounds range. The viewport bounds range [min, max]
can be determined by calling glGet() with argument GL_VIEWPORT_BOUNDS_RANGE. Viewport
width and height are silently clamped to a range that depends on the implementation. To
query this range, call glGet() with argument GL_MAX_VIEWPORT_DIMS.
The precision with which the GL interprets the floating point viewport bounds is
implementation-dependent and may be determined by querying the impementation-defined
GL_INVALID_VALUE is generated if first is greater than or equal to the value of
GL_INVALID_VALUE is generated if first + count is greater than or equal to the value of
GL_INVALID_VALUE is generated if either width or height is negative.
glGet() with argument GL_VIEWPORT
glGet() with argument GL_MAX_VIEWPORT_DIMS
glGet() with argument GL_VIEWPORT_BOUNDS_RANGE
glGet() with argument GL_VIEWPORT_SUBPIXEL_BITS
glDepthRange(), glViewport(), glViewportIndexed()
Copyright (C) 2010 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.
opengl.org 06/10/2014 GLVIEWPORTARRAY(3G)