GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.6 |
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glViewport(3gl) |
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glViewport − set the viewport
void glViewport( GLint x,
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GLint y, | |
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GLsizei width, | |
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GLsizei height ) |
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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 ($x sub nd$, $y sub nd$) be normalized device coordinates. Then the window coordinates ($x sub w$, $y sub w$) 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.
GL_INVALID_OPERATION is generated if glViewport is executed between the execution of glBegin and the corresponding execution of glEnd.
glGet
with argument GL_VIEWPORT
glGet with argument GL_MAX_VIEWPORT_DIMS
glDepthRange(3G)
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glViewport(3gl) | |