glMultiDrawArrays

From OpenGL Reference
Jump to navigation Jump to search

Render multiple sets of primitives from array data.

C Specification[edit]

void glMultiDrawArrays( GLenum mode, const GLint * first, const GLsizei * count, GLsizei drawcount );

Parameters[edit]

mode - Specifies what kind of primitives to render. Symbolic constants GL_POINTSGL_LINE_STRIPGL_LINE_LOOPGL_LINESGL_LINE_STRIP_ADJACENCYGL_LINES_ADJACENCYGL_TRIANGLE_STRIPGL_TRIANGLE_FANGL_TRIANGLESGL_TRIANGLE_STRIP_ADJACENCYGL_TRIANGLES_ADJACENCY and GL_PATCHES are accepted.
first - Points to an array of starting indices in the enabled arrays.
count - Points to an array of the number of indices to be rendered.
drawcount - Specifies the size of the first and count

Description[edit]

glMultiDrawArrays specifies multiple sets of geometric primitives with very few subroutine calls. Instead of calling a GL procedure to pass each individual vertex, normal, texture coordinate, edge flag, or color, you can prespecify separate arrays of vertices, normals, and colors and use them to construct a sequence of primitives with a single call to glMultiDrawArrays.

glMultiDrawArrays behaves identically to glDrawArrays except that drawcount separate ranges of elements are specified instead.

When glMultiDrawArrays is called, it uses count sequential elements from each enabled array to construct a sequence of geometric primitives, beginning with element firstmode specifies what kind of primitives are constructed, and how the array elements construct those primitives.

Vertex attributes that are modified by glMultiDrawArrays have an unspecified value after glMultiDrawArrays returns. Attributes that aren't modified remain well defined.

Notes[edit]

GL_LINE_STRIP_ADJACENCYGL_LINES_ADJACENCYGL_TRIANGLE_STRIP_ADJACENCY, and GL_TRIANGLES_ADJACENCY are available only if the GL version is 3.2 or greater.

Errors[edit]

GL_INVALID_ENUM is generated if mode is not an accepted value.

GL_INVALID_VALUE is generated if drawcount is negative.

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

Version Support[edit]

 glMultiDrawArrays  2.0+

See Also[edit]

glDrawElementsglDrawRangeElements 

Copyright[edit]

Copyright© 1991-2006 Silicon Graphics, Inc. Copyright© 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.