Difference between revisions of "GLAPI/glDrawElementsBaseVertex"

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== Function Definition ==
 
== Function Definition ==
  
   void '''glDrawElementsBaseVertex'''(GLenum ''mode'', GLsizei ''count'', GLenum ''type'', GLvoid *''indices'', GLint ''basevertex'');
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   void '''glDrawElementsBaseVertex'''(GLenum {{param|mode}}, GLsizei {{param|count}}, GLenum {{param|type}}, GLvoid *{{param|indices}}, GLint {{param|basevertex}});
  
 
; mode
 
; mode
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: Specifies a pointer to the location where the indices are stored.
 
: Specifies a pointer to the location where the indices are stored.
 
; basevertex
 
; basevertex
: Specifies a constant that should be added to each element of ''indices'' when chosing elements from the enabled vertex arrays.
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: Specifies a constant that should be added to each element of {{param|indices}} when chosing elements from the enabled vertex arrays.
  
 
== Description ==
 
== Description ==
  
'''glDrawElementsBaseVertex''' behaves identically to [[GLAPI/glDrawElements|glDrawElements]] except that the ''i''th 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.
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'''glDrawElementsBaseVertex''' behaves identically to {{apifunc|glDrawElements}} except that the ''i''th element transferred by the corresponding draw call will be taken from element {{param|indices}}[i] + {{param|basevertex}} of each enabled array. If the resulting value is larger than the maximum value representable by {{param|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.
  
 
== Notes ==
 
== Notes ==
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'''glDrawElementsBaseVertex'''{{code|ARB_draw_elements_base_vertex}}== Errors ==
 
'''glDrawElementsBaseVertex'''{{code|ARB_draw_elements_base_vertex}}== Errors ==
  
{{code|GL_INVALID_ENUM}} is generated if ''mode'' is not an accepted value.
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{{code|GL_INVALID_ENUM}} is generated if {{param|mode}} is not an accepted value.
  
{{code|GL_INVALID_VALUE}} is generated if ''count'' is negative.
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{{code|GL_INVALID_VALUE}} is generated if {{param|count}} is negative.
  
{{code|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.
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{{code|GL_INVALID_OPERATION}} is generated if a geometry shader is active and {{param|mode}} is incompatible with the input primitive type of the geometry shader in the currently installed program object.
  
 
{{code|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.
 
{{code|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.
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== See Also ==
 
== See Also ==
  
[[GLAPI/glDrawElements|glDrawElements]], [[GLAPI/glDrawRangeElements|glDrawRangeElements]], [[GLAPI/glDrawRangeElementsBaseVertex|glDrawRangeElementsBaseVertex]], [[GLAPI/glDrawElementsInstanced|glDrawElementsInstanced]], [[GLAPI/glDrawElementsInstancedBaseVertex|glDrawElementsInstancedBaseVertex]]
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{{apifunc|glDrawElements}}, {{apifunc|glDrawRangeElements}}, {{apifunc|glDrawRangeElementsBaseVertex}}, {{apifunc|glDrawElementsInstanced}}, {{apifunc|glDrawElementsInstancedBaseVertex}}
  
 
== Copyright ==
 
== Copyright ==

Revision as of 21:17, 28 April 2012

glDrawElementsBaseVertex
Core in version 4.5
Core since version 3.2
Core ARB extension ARB_draw_elements_base_vertex


glDrawElementsBaseVertex: render primitives from array data with a per-element offset

Function Definition

 void glDrawElementsBaseVertex(GLenum mode​, GLsizei count​, GLenum type​, GLvoid *indices​, GLint basevertex​);
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.
basevertex
Specifies a constant that should be added to each element of indices​ when chosing elements from the enabled vertex arrays.

Description

glDrawElementsBaseVertex behaves identically to glDrawElements 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.

Notes

glDrawElementsBaseVertexARB_draw_elements_base_vertex​== Errors ==

GL_INVALID_ENUM​ is generated if mode​ is not an accepted value.

GL_INVALID_VALUE​ is generated if count​ 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 © 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/.