Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

glviewportindexed(3g) [centos man page]

GLVIEWPORTINDEXED(3G)						   OpenGL Manual					     GLVIEWPORTINDEXED(3G)

NAME
glViewportIndexed - set a specified viewport C SPECIFICATION
void glViewportIndexedf(GLuint index, GLfloat x, GLfloat y, GLfloat w, GLfloat h); void glViewportIndexedfv(GLuint index, const GLfloat *v); PARAMETERS
index Specify the first viewport to set. x, y For glViewportIndexedf, specifies the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0). width, height For glViewportIndexedf, specifies 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. v For glViewportIndexedfv, specifies the address of an array containing the viewport parameters. DESCRIPTION
glViewportIndexedf and glViewportIndexedfv specify the parameters for a single viewport. index specifies the index of the viewport to modify. index must be less than the value of GL_MAX_VIEWPORTS. For glViewportIndexedf, x, y, w, and h specify the left, bottom, width and height of the viewport in pixels, respectively. For glViewportIndexedfv, 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 constant GL_VIEWPORT_SUBPIXEL_BITS. Calling glViewportIndexedfv is equivalent to calling glViewportArray() with first set to index, count set to 1 and v passsed directly. glViewportIndexedf is equivalent to: void glViewportIndexedf(GLuint index, GLfloat x, GLfloat y, GLfloat w, GLfloat h) { const float v[4] = { x, y, w, h }; glViewportArrayv(index, 1, v); } ERRORS
GL_INVALID_VALUE is generated if index is greater than or equal to the value of GL_MAX_VIEWPORTS. 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 glGet() with argument GL_VIEWPORT_BOUNDS_RANGE glGet() with argument GL_VIEWPORT_SUBPIXEL_BITS SEE ALSO
glDepthRange(), glViewport(), glViewportArray() COPYRIGHT
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. http://opencontent.org/openpub/. AUTHORS
opengl.org opengl.org 06/10/2014 GLVIEWPORTINDEXED(3G)

Check Out this Related Man Page

GLSCISSORARRAY(3G)						   OpenGL Manual						GLSCISSORARRAY(3G)

NAME
glScissorArray - define the scissor box for multiple viewports C SPECIFICATION
void glScissorArrayv(GLuint first, GLsizei count, const GLint *v); PARAMETERS
first Specifies the index of the first viewport whose scissor box to modify. count Specifies the number of scissor boxes to modify. v Specifies the address of an array containing the left, bottom, width and height of each scissor box, in that order. DESCRIPTION
glScissorArrayv defines rectangles, called scissor boxes, in window coordinates for each viewport. first specifies the index of the first scissor box to modify and count specifies the number of scissor boxes 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. v specifies the address of an array containing integers specifying the lower left corner of the scissor boxes, and the width and height of the scissor boxes, in that order. To enable and disable the scissor test, call glEnable() and glDisable() with argument GL_SCISSOR_TEST. The test is initially disabled for all viewports. While the test is enabled, only pixels that lie within the scissor box can be modified by drawing commands. Window coordinates have integer values at the shared corners of frame buffer pixels. glScissor(0,0,1,1) allows modification of only the lower left pixel in the window, and glScissor(0,0,0,0) doesn't allow modification of any pixels in the window. When the scissor test is disabled, it is as though the scissor box includes the entire window. 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. GL_INVALID_VALUE is generated if any width or height specified in the array v is negative. ASSOCIATED GETS
glGet() with argument GL_SCISSOR_BOX glIsEnabled() with argument GL_SCISSOR_TEST SEE ALSO
glEnable(), glViewport(), glViewportIndexed(), glViewportArray() COPYRIGHT
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. http://opencontent.org/openpub/. AUTHORS
opengl.org opengl.org 06/10/2014 GLSCISSORARRAY(3G)
Man Page

Featured Tech Videos