GLAPI/glDrawArrays: Difference between revisions
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; mode | ; mode | ||
: Specifies what kind of primitives to render. Symbolic constants {{ | : Specifies what kind of primitives to render. Symbolic constants {{enum|GL_POINTS}}, {{enum|GL_LINE_STRIP}}, {{enum|GL_LINE_LOOP}}, {{enum|GL_LINES}}, {{enum|GL_LINE_STRIP_ADJACENCY}}, {{enum|GL_LINES_ADJACENCY}}, {{enum|GL_TRIANGLE_STRIP}}, {{enum|GL_TRIANGLE_FAN}}, {{enum|GL_TRIANGLES}}, {{enum|GL_TRIANGLE_STRIP_ADJACENCY}}, {{enum|GL_TRIANGLES_ADJACENCY}} and {{enum|GL_PATCHES}} are accepted. | ||
; first | ; first | ||
: Specifies the starting index in the enabled arrays. | : Specifies the starting index in the enabled arrays. | ||
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== Notes == | == Notes == | ||
{{ | {{enum|GL_LINE_STRIP_ADJACENCY}}, {{enum|GL_LINES_ADJACENCY}}, {{enum|GL_TRIANGLE_STRIP_ADJACENCY}} and {{enum|GL_TRIANGLES_ADJACENCY}} are available only if the GL version is 3.2 or greater. | ||
== Errors == | == Errors == | ||
{{ | {{enum|GL_INVALID_ENUM}} is generated if {{param|mode}} is not an accepted value. | ||
{{ | {{enum|GL_INVALID_VALUE}} is generated if {{param|count}} is negative. | ||
{{ | {{enum|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. | ||
{{ | {{enum|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. | ||
== See Also == | == See Also == | ||
Revision as of 17:19, 29 April 2012
| Core in version | 4.6 | |
|---|---|---|
| Core since version | 1.1 | |
glDrawArrays: render primitives from array data
Function Definition
void glDrawArrays(GLenum mode, GLint first, GLsizei count);
- mode
- Specifies what kind of primitives to render. Symbolic constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_TRIANGLE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY and GL_PATCHES are accepted.
- first
- Specifies the starting index in the enabled arrays.
- count
- Specifies the number of indices to be rendered.
Description
glDrawArrays specifies multiple 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 glDrawArrays.
When glDrawArrays is called, it uses count sequential elements from each enabled array to construct a sequence of geometric primitives, beginning with element first. mode specifies what kind of primitives are constructed and how the array elements construct those primitives.
Vertex attributes that are modified by glDrawArrays have an unspecified value after glDrawArrays returns. Attributes that aren't modified remain well defined.
Notes
GL_LINE_STRIP_ADJACENCY, GL_LINES_ADJACENCY, GL_TRIANGLE_STRIP_ADJACENCY and GL_TRIANGLES_ADJACENCY are available only if the GL version is 3.2 or greater.
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 non-zero buffer object name is bound to an enabled array and the buffer object's data store is currently mapped.
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.
See Also
glDrawArraysInstanced, glDrawElements, glDrawRangeElements,
Copyright
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/.