| Name |
| |
| OES_point_size_array |
| |
| Name Strings |
| |
| GL_OES_point_size_array |
| |
| Contact |
| |
| Aaftab Munshi (amunshi@ati.com) |
| |
| Notice |
| |
| Copyright (c) 2008-2013 The Khronos Group Inc. Copyright terms at |
| http://www.khronos.org/registry/speccopyright.html |
| |
| Specification Update Policy |
| |
| Khronos-approved extension specifications are updated in response to |
| issues and bugs prioritized by the Khronos OpenGL ES Working Group. For |
| extensions which have been promoted to a core Specification, fixes will |
| first appear in the latest version of that core Specification, and will |
| eventually be backported to the extension document. This policy is |
| described in more detail at |
| https://www.khronos.org/registry/OpenGL/docs/update_policy.php |
| |
| Status |
| |
| Ratified by the Khronos BOP, Aug 5, 2004. |
| |
| Version |
| |
| Last Modifed Date: 23 Dec 2008 |
| |
| Number |
| |
| OpenGL ES Extension #14 |
| |
| Dependencies |
| |
| OpenGL ES 1.0 is required. |
| OES_point_sprite is required |
| |
| The extension is written against the OpenGL 1.5 Specification. |
| |
| Overview |
| |
| This extension extends how points and point sprites are rendered |
| by allowing an array of point sizes instead of a fixed input point |
| size given by PointSize. This provides flexibility for applications |
| to do particle effects. |
| |
| The vertex arrays will be extended to include a point size array. |
| The point size array can be enabled/disabled via POINT_SIZE_ARRAY_OES. |
| |
| The point size array, if enabled, controls the sizes used to render |
| points and point sprites. If point size array is enabled, the point |
| size defined by PointSize is ignored. The point sizes supplied in the |
| point size arrays will be the sizes used to render both points and |
| point sprites. |
| |
| IP Status |
| |
| None. |
| |
| Issues |
| |
| |
| New Procedures and Functions |
| |
| void PointSizePointerOES(enum type, sizei stride, const void *ptr ) |
| |
| valid values of type are GL_FIXED and GL_FLOAT |
| the <size> parameter is removed since <size> is always 1 |
| |
| New Tokens |
| |
| Accepted by the <cap> parameters of EnableClientState/DisableClientState |
| and by the <pname> parameter of IsEnabled: |
| |
| POINT_SIZE_ARRAY_OES 0x8B9C |
| |
| Accepted by the <pname> parameter of GetIntegerv: |
| |
| POINT_SIZE_ARRAY_TYPE_OES 0x898A |
| POINT_SIZE_ARRAY_STRIDE_OES 0x898B |
| POINT_SIZE_ARRAY_BUFFER_BINDING_OES 0x8B9F |
| |
| Accepted by the <pname> parameter of GetPointerv: |
| |
| POINT_SIZE_ARRAY_POINTER_OES 0x898C |
| |
| Additions to Chapter 2 of the OpenGL 1.5 specification |
| |
| - section 2.8, added the following |
| |
| void PointSizePointerOES(enum type, sizei stride, const void *ptr); |
| |
| PointSizePointerOES is used to describe the point size for a given vertex |
| |
| - Added to table 2.4 |
| |
| Command Sizes Types |
| ------- ----- ----- |
| PointSizePointerOES 1 float, fixed |
| |
| - (section 2.8), added the following |
| Extend the cap flags passed to EnableClientState/DisableClientState |
| to include POINT_SIZE_ARRAY_OES |
| |
| Errors |
| |
| None. |
| |
| New State |
| |
| (table 6.6, p. 232) |
| Get Initial |
| Get Value Type Command Value Description |
| --------- ---- ------- ------- ----------- |
| POINT_SIZE_ARRAY_OES B IsEnabled False point sprite array enable |
| POINT_SIZE_ARRAY_TYPE_OES Z2 GetIntegerv Float type of point size |
| POINT_SIZE_ARRAY_STRIDE_OES Z+ GetIntegerv 0 stride between point sizes |
| POINT_SIZE_ARRAY_POINTER_OES Y GetPointerv 0 pointer to point sprite array |
| |
| (table 6.7, p. 233) |
| |
| Get Initial |
| Get Value Type Command Value Description |
| --------- ---- ------- ------- ----------- |
| |
| POINT_SIZE_ARRAY_BUFFER_BINDING_OES Z+ GetIntegerv 0 point size array |
| buffer binding |
| |
| Revision History |
| |
| 2008.12.23 benj Per Bugzilla 4310, remove language saying that points |
| are not drawn if point size array points are invalid, |
| since this is not (always) detectable. This aligns |
| point size array behavior with all other array types, |
| where implementations can crash if given invalid |
| pointers to client data. |
