glDrawRangeElements — render primitives from array data
void glDrawRangeElements( | GLenum mode, |
| GLuint start, | |
| GLuint end, | |
| GLsizei count, | |
| GLenum type, | |
const GLvoid * indices); |
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 and GL_TRIANGLES are accepted.
start Specifies the minimum array index contained in indices.
end Specifies the maximum array index contained in indices.
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 byte offset (cast to a pointer type) into the buffer bound to GL_ELEMENT_ARRAY_BUFFER to start reading indices from. If no buffer is bound, specifies a pointer to the location where the indices are stored.
glDrawRangeElements is a restricted form of glDrawElements. mode, count, and type match the corresponding arguments to glDrawElements, with the additional constraint that all values in the arrays count must lie between start and end, inclusive.
Implementations denote recommended maximum amounts of vertex and index data, which may be queried by calling glGet with argument GL_MAX_ELEMENTS_VERTICES and GL_MAX_ELEMENTS_INDICES. If is greater than the value of GL_MAX_ELEMENTS_VERTICES, or if count is greater than the value of GL_MAX_ELEMENTS_INDICES, then the call may operate at reduced performance. There is no requirement that all vertices in the range be referenced. However, the implementation may partially process unused vertices, reducing performance from what could be achieved with an optimal index set.
When glDrawRangeElements is called, it uses count sequential elements from an enabled array, starting at start to construct a sequence of geometric primitives. mode specifies what kind of primitives are constructed, and how the array elements construct these primitives. If more than one array is enabled, each is used.
To enable and disable a generic vertex attribute array, call glEnableVertexAttribArray and glDisableVertexAttribArray.
If an array corresponding to a generic attribute required by a vertex shader is not enabled, then the corresponding element is taken from the current generic attribute state.
It is an error for indices to lie outside the range , but implementations may not check for this situation. Such indices cause implementation-dependent behavior.
GL_INVALID_ENUM is generated if mode is not an accepted value.
GL_INVALID_VALUE is generated if count is negative.
GL_INVALID_VALUE is generated if .
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.
GL_INVALID_FRAMEBUFFER_OPERATION is generated if the currently bound framebuffer is not framebuffer complete (i.e. the return value from glCheckFramebufferStatus is not GL_FRAMEBUFFER_COMPLETE).
GL_INVALID_OPERATION is generated if transform feedback is active and not paused.
glGet with argument GL_MAX_ELEMENTS_VERTICES
glGet with argument GL_MAX_ELEMENTS_INDICES
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
| glDrawRangeElements | - | ✔ | ✔ |
glCheckFramebufferStatus, glDisableVertexAttribArray, glDrawArrays, glDrawElements, glDrawArraysInstanced, glDrawElementsInstanced, glEnableVertexAttribArray,
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