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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
38 lines
1.8 KiB
Plaintext
38 lines
1.8 KiB
Plaintext
'''_glPolygonOffset:''' set the scale and units used to calculate depth values
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{{PageSyntax}}
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SUB _glPolygonOffset (BYVAL factor AS SINGLE, BYVAL units AS SINGLE)
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void '''_glPolygonOffset'''(GLfloat {{Parameter|factor}}, GLfloat {{Parameter|units}});
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; factor
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: Specifies a scale factor that is used to create a variable depth offset for each polygon. The initial value is 0.
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; units
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: Is multiplied by an implementation-specific value to create a constant depth offset. The initial value is 0.
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{{PageDescription}}
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When {{KW|_GL_POLYGON_OFFSET_FILL}}, {{KW|_GL_POLYGON_OFFSET_LINE}}, or {{KW|_GL_POLYGON_OFFSET_POINT}} is enabled, each fragment's ''depth'' value will be offset after it is interpolated from the ''depth'' values of the appropriate vertices. The value of the offset is ''factor'' * ''DZ'' + ''r'' * ''units'', where ''DZ'' is a measurement of the change in depth relative to the screen area of the polygon, and ''r'' is the smallest value that is guaranteed to produce a resolvable offset for a given implementation. The offset is added before the depth test is performed and before the value is written into the depth buffer.
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'''_glPolygonOffset''' is useful for rendering hidden-line images, for applying decals to surfaces, and for rendering solids with highlighted edges.
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{{PageUseWith}}
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{{KW|_glIsEnabled}} with argument {{KW|_GL_POLYGON_OFFSET_FILL}}, {{KW|_GL_POLYGON_OFFSET_LINE}}, or {{KW|_GL_POLYGON_OFFSET_POINT}}.
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{{KW|_glGet}} with argument {{KW|_GL_POLYGON_OFFSET_FACTOR}} or {{KW|_GL_POLYGON_OFFSET_UNITS}}.
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{{PageSeeAlso}}
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{{KW|_GL}}
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{{KW|_glDepthFunc}}, {{KW|_glEnable}}
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{{PageCopyright}}
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Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see [http://oss.sgi.com/projects/FreeB/ http://oss.sgi.com/projects/FreeB/]. |