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Showing content from https://www.khronos.org/opengles/sdk/docs/man3/html/glViewport.xhtml below:

OpenGL ES 3 Reference Pages

Name

glViewport — set the viewport

C Specification void glViewport( GLint x,   GLint y,   GLsizei width,   GLsizei height);

 

Parameters
x, y

Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).

width, height

Specify the width and height of the viewport. When a GL context is first attached to a window, width and height are set to the dimensions of that window.

Description

glViewport 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

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.

Errors

GL_INVALID_VALUE is generated if either width or height is negative.

Associated Gets

glGet with argument GL_VIEWPORT

glGet with argument GL_MAX_VIEWPORT_DIMS

API Version Support OpenGL ES API Version Function Name 2.0 3.0 glViewport ✔ ✔

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