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glscissorarray(3g) [centos 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)

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GLDEPTHRANGEARRAY(3G)						   OpenGL Manual					     GLDEPTHRANGEARRAY(3G)

NAME
glDepthRangeArray - specify mapping of depth values from normalized device coordinates to window coordinates for a specified set of viewports C SPECIFICATION
void glDepthRangeArrayv(GLuint first, GLsizei count, const GLdouble *v); PARAMETERS
first Specifies the index of the first viewport whose depth range to update. count Specifies the number of viewports whose depth range to update. v Specifies the address of an array containing the near and far values for the depth range of each modified viewport. DESCRIPTION
After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. Each viewport has an independent depth range specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). glDepthRangeArray specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates for each viewport in the range [first, first + count). Thus, the values accepted by glDepthRangeArray are both clamped to this range before they are accepted. The first parameter specifies the index of the first viewport whose depth range to modify and must be less than the value of GL_MAX_VIEWPORTS. count specifies the number of viewports whose depth range to modify. first + count must be less than or equal to the value of GL_MAX_VIEWPORTS. v specifies the address of an array of pairs of double precision floating point values representing the near and far values of the depth range for each viewport, in that order. The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized. NOTES
It is not necessary that the near plane distance be less than the far plane distance. Reverse mappings such as near = 1, and far = 0 are acceptable. The type of the v parameter was changed from GLclampd to GLdouble. This change is transparent to user code and is described in detail on the removedTypes() page. 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. ASSOCIATED GETS
glGet() with argument GL_DEPTH_RANGE SEE ALSO
glDepthFunc(), glDepthRange(), glDepthRangeIndexed(), glPolygonOffset(), glViewportArray(), glViewport(), removedTypes() 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 GLDEPTHRANGEARRAY(3G)
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