GL_OES_point_sprite

Supported Hardware

Series5, Series5XT, Series6, Series6XE, Series6XT

Valid APIs

OpenGL ES 1.x

Description

This extension extends the standard functionality of OpenGL points to allow more flexible rendering than otherwise provided. For a core point object, OpenGL ES specifies that texture coordinates are identical across the entire body of the point, and it is then anti-aliased to fade out. To work around this, developers often use a quad with an alpha blended/tested texture to allow the full range of a texture to be expressed. When in use, this extension disables the anti-aliasing on the point, and instead interpolates the texture coordinates provided over the entire body of the point, allowing a point to be effectively textured to represent a sprite.

Note

This functionality is core to OpenGL ES 2.0 and 3.0.

Registry Link

http://www.khronos.org/registry/gles/extensions/OES/OES_point_sprite.txt

Example

// Enable point sprite drawing 
glEnable(GL_POINT_SPRITE_OES); 
// Set the texture environment to use point sprite coordinate replace to true, so that texture 
// coordinates are interpolated automatically across the rendered point, rather than using a 
// single coordinate. 
glTexEnvi(GL_POINT_SPRITE_OES, GL_COORD_REPLACE_OES, GL_TRUE); 
// Draw some point sprites at the locations specified in  
glDraw(GL_POINTS, ...);