centos man page for gldrawelementsinstancedbasevertexbaseinstance

GLDRAWELEMENTSINSTAN(3G)					   OpenGL Manual					  GLDRAWELEMENTSINSTAN(3G)

NAME
       glDrawElementsInstancedBaseVertexBaseInstance - render multiple instances of a set of primitives from array data with a per-element offset

C SPECIFICATION
       void glDrawElementsInstancedBaseVertexBaseInstance(GLenum mode, GLsizei count, GLenum type, GLvoid *indices, GLsizei primcount,
							  GLint basevertex, GLuint baseinstance);

PARAMETERS
       mode
	   Specifies what kind of primitives to render. Symbolic constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_TRIANGLE_STRIP,
	   GL_TRIANGLE_FAN, GL_TRIANGLES, GL_LINES_ADJACENCY, GL_LINE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY and
	   GL_PATCHES are accepted.

       count
	   Specifies the number of elements to be rendered.

       type
	   Specifies the type of the values in indices. Must be one of GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.

       indices
	   Specifies a pointer to the location where the indices are stored.

       primcount
	   Specifies the number of instances of the indexed geometry that should be drawn.

       basevertex
	   Specifies a constant that should be added to each element of indices when chosing elements from the enabled vertex arrays.

       baseinstance
	   Specifies the base instance for use in fetching instanced vertex attributes.

DESCRIPTION
       glDrawElementsInstancedBaseVertexBaseInstance behaves identically to glDrawElementsInstanced() except that the ith element transferred by
       the corresponding draw call will be taken from element indices[i] + basevertex of each enabled array. If the resulting value is larger than
       the maximum value representable by type, it is as if the calculation were upconverted to 32-bit unsigned integers (with wrapping on
       overflow conditions). The operation is undefined if the sum would be negative. The basevertex has no effect on the shader-visible value of
       gl_VertexID.

       Specific vertex attributes may be classified as instanced through the use of glVertexAttribDivisor(). Instanced vertex attributes supply
       per-instance vertex data to the vertex shader. The index of the vertex fetched from the enabled instanced vertex attribute arrays is
       calculated as gl _ InstanceID divisor + baseInstance. Note that baseinstance does not affect the shader-visible value of gl_InstanceID.

NOTES
       glDrawElementsInstancedBaseVertex is only supported if the GL version is 3.2 or greater.
	   .SH "ERRORS"

       GL_INVALID_ENUM is generated if mode is not an accepted value.

       GL_INVALID_VALUE is generated if count or primcount is negative.

       GL_INVALID_OPERATION is generated if a geometry shader is active and mode is incompatible with the input primitive type of the geometry
       shader in the currently installed program object.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to an enabled array or the element array and the buffer
       object's data store is currently mapped.

SEE ALSO
       glDrawElements(), glDrawRangeElements(), glDrawRangeElementsBaseVertex(), glDrawElementsInstanced(), glDrawElementsInstancedBaseVertex()

COPYRIGHT
       Copyright (C) 2011 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						  GLDRAWELEMENTSINSTAN(3G)