|Core in version||4.6|
|Core since version||1.0|
glViewport: set the viewport
void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);
- 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.
glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let (xnd, ynd) be normalized device coordinates. Then the window coordinates (xw, yw) are computed as follows:
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.
GL_INVALID_VALUE is generated if either width or height is negative.
glGet with argument GL_VIEWPORT
glGet with argument GL_MAX_VIEWPORT_DIMS
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