Contents

• Dependencies
• Overview
• New Procedures and Functions
• New Tokens
• Errors
• New Implementation Dependent State

Dependencies

None

Overview

glDrawRangeElementsEXT is a restricted form of glDrawElements. All vertices referenced by indices must lie between start and end inclusive. Not all vertices between start and end must be referenced, however unreferenced vertices may be sent through some of the vertex pipeline before being discarded, reducing performance from what could be achieved by an optimal index set. Index values which lie outside the range will cause implementation-dependent results.

glDrawRangeElementsEXT may also be further constrained to only operate at maximum performance for limited amounts of data. Implementations may advertise recommended maximum amounts of vertex and index data using the GL_MAX_ELEMENTS_VERTICES_EXT and GL_MAX_ELEMENTS_INDICES_EXT enumerants. If a particular call to glDrawRangeElementsEXT has (end-start+1) greater than GL_MAX_ELEMENTS_VERTICES_EXT or if count is greater than GL_MAX_ELEMENTS_INDICES_EXT then the implementation may be forced to process the data less efficiently than it could have with less data. An implementation which has no effective limits can advertise the maximum integer value for the two enumerants. An implementation must always process a glDrawRangeElementsEXT call with valid parameters regardless of the amount of data passed in the call.

New Procedures and Functions

``` void glDrawRangeElementsEXT( GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const GLvoid *indices)

```

New Tokens

None

Errors

GL_INVALID_VALUE will be returned if end is less than start. Other errors are as for glDrawElements.

New Implementation Dependent State

Add two implementation-dependent limits for describing data size recommendations for glDrawRangeElementsEXT:

|GL_MAX_ELEMENTS_VERTICES_EXT| |:-------------------------------| |GL_MAX_ELEMENTS_INDICES_EXT |