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Manual Reference Pages  - GLDRAWRANGEELEMENTS (3G)

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glDrawRangeElements - render primitives from array data

CONTENTS

C Specification
Parameters
Description
Notes
Errors
Associated Gets
See Also

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,  GL_TRIANGLES,  GL_QUAD_STRIP,  GL_QUADS, and  GL_POLYGON 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 count. 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.

 glDrawRangeElements is a restricted form of  glDrawElements. mode, start, end, and count 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 end - start + 1 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 [start, end] 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 start sequential elements from an enabled array, starting at count 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. If  GL_VERTEX_ARRAY is not enabled, no geometric primitives are constructed.

Vertex attributes that are modified by  glDrawRangeElements have an unspecified value after  glDrawRangeElements returns. For example, if  GL_COLOR_ARRAY is enabled, the value of the current color is undefined after  glDrawRangeElements executes. Attributes that aren’t modified maintain their previous values.

 glDrawRangeElements is available only if the GL version is 1.2 or greater.

 glDrawRangeElements is included in display lists. If  glDrawRangeElements is entered into a display list, the necessary array data (determined by the array pointers and enables) is also entered into the display list. Because the array pointers and enables are client-side state, their values affect display lists when the lists are created, not when the lists are executed.

It is an error for indices to lie outside the range [start, end], 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 end < start.

 GL_INVALID_OPERATION is generated if  glDrawRangeElements is executed between the execution of  glBegin and the corresponding  glEnd.

 glGet with argument  GL_MAX_ELEMENTS_VERTICES

 glGet with argument  GL_MAX_ELEMENTS_INDICES

 glArrayElement(3G),  glColorPointer(3G),  glDrawArrays(3G),  glDrawElements(3G),  glEdgeFlagPointer(3G),  glGetPointerv(3G),  glIndexPointer(3G),  glInterleavedArrays(3G),  glNormalPointer(3G),  glTexCoordPointer(3G),  glVertexPointer(3G)

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