plucky (3) glDrawElementsInstancedBaseVertexBaseInstance.3G.gz

Provided by: opengl-4-man-doc_1.0~svn33624-3_all bug

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.


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.


VERSION SUPPORT
       ┌──────────────────────────────────────────────┬───────────────────────────────────────────────────────────────────────┐
       │                                              │                OpenGL Version                                         │
       ├──────────────────────────────────────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │Function                                      │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │/                                             │     │     │     │     │     │     │     │     │     │     │     │     │
       │Feature                                       │     │     │     │     │     │     │     │     │     │     │     │     │
       │Name                                          │     │     │     │     │     │     │     │     │     │     │     │     │
       ├──────────────────────────────────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glDrawElementsInstancedBaseVertexBaseInstance │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │  ✔  │  ✔  │  ✔  │
       └──────────────────────────────────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘


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


       Copyright © 2011-2014 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/.


       Copyright © 2011-2014 Khronos Group

[FIXME: source]                                    11/18/2024                           GLDRAWELEMENTSINSTAN(3G)