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docs.GL

glMultiDrawElementsBaseVertex

Name

glMultiDrawElementsBaseVertex — render multiple sets of primitives by specifying indices of array data elements and an index to apply to each index

C Specification

void glMultiDrawElementsBaseVertex(GLenum mode,
const GLsizei *count,
GLenum type,
const GLvoid **indices,
GLsizei primcount,
GLint *basevertex);

Parameters

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 and GL_TRIANGLES_ADJACENCY are accepted.

count

Points to an array of the elements counts.

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 size of the count array.

basevertex

Specifies a pointer to the location where the base vertices are stored.

Description

glMultiDrawElementsBaseVertex behaves identically to glDrawElementsBaseVertex, except that primcount separate lists of elements are specifried instead.

It has the same effect as: 

    for (int i = 0; i < primcount; i++)
        if (count[i] > 0)
            glDrawElementsBaseVertex(mode,
                                     count[i],
                                     type,
                                     indices[i],
                                     basevertex[i]);

Notes

glMultiDrawElementsBaseVertex is available only if the GL version is 3.1 or greater.

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 primcount is negative.

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

glMultiDrawElements, glDrawElementsBaseVertex, glDrawArrays, glVertexAttribPointer

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