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glPolygonOffset

Name

glPolygonOffset — set the scale and units used to calculate depth values

C Specification

void glPolygonOffset( GLfloat factor,
  GLfloat units);
 

Parameters

factor

Specifies a scale factor that is used to create a variable depth offset for each polygon. The initial value is 0.

units

Is multiplied by an implementation-specific value to create a constant depth offset. The initial value is 0.

Description

When GL_POLYGON_OFFSET_FILL 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.

glPolygonOffset is useful for applying decals.

Associated Gets

glIsEnabled with argument GL_POLYGON_OFFSET_FILL.

glGet with argument GL_POLYGON_OFFSET_FACTOR or GL_POLYGON_OFFSET_UNITS.

API Version Support

OpenGL ES API Version
Function Name 2.0 3.0 3.1
glPolygonOffset
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