glDrawElementsInstancedBaseVertexBaseInstance — render multiple instances of a set of primitives from array data with a per-element offset
void glDrawElementsInstancedBaseVertexBaseInstance(
|
GLenum mode, |
| GLsizei count, | |
| GLenum type, | |
| GLvoid *indices, | |
| GLsizei instancecount, | |
| GLint basevertex, | |
GLuint baseinstance); |
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.
instancecount
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.
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.
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
baseinstance
does not affect the shader-visible value of
gl_InstanceID.
glDrawElementsInstancedBaseVertex is only supported if the GL version is 3.2 or greater.
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_VALUE is generated if count or instancecount 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.
| OpenGL Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
glDrawElementsInstancedBaseVertexBaseInstance
|
- | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ |
glDrawElements, glDrawRangeElements, glDrawRangeElementsBaseVertex, glDrawElementsInstanced, glDrawElementsInstancedBaseVertex
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