Name OES_single_precision Name Strings GL_OES_single_precision Contact David Blythe (blythe 'at' bluevoid.com) Status Ratified by the Khronos BOP, July 23, 2003. Version Last Modifed Date: 22 July 2003 Author Revision : 0.4 Number 293 Dependencies None The extension is written against the OpenGL 1.3 Specification. Overview This extension adds commands with single-precision floating-point parameters corresponding to the commands that only variants that accept double-precision floating-point input. This allows an application to avoid using double-precision floating-point data types. New commands are added with an 'f' prefix. IP Status None Issues * An alternative is to suggest platforms define GLfloat and GLdouble to be the same type, since it is unlikely that both single- and double-precision are required at the same time. Resolved: This might create additional confusion, so it is better to define new commands. New Procedures and Functions void DepthRangefOES(clampf n, clampf f); void FrustumfOES(float l, float r, float b, float t, float n, float f); void OrthofOES(float l, float r, float b, float t, float n, float f); void ClipPlanefOES(enum plane, const float* equation); void GetClipPlanefOES(enum plane, float* equation); void glClearDepthfOES(clampd depth); New Tokens None Additions to Chapter 2 of the OpenGL 1.3 Specification (OpenGL Operation) Section 2.10 Coordinate Transformations Revise to include 'f' suffix. Add alternate suffixed versions of DepthRange (2.10.1). Add alternate suffixed versions of Ortho and Frustum (2.10.2). Section 2.11 Clipping Add alternate suffixed version of ClipPlane. Additions to Chapter 3 of the OpenGL 1.3 Specification (Rasterization) None Additions to Chapter 4 of the OpenGL 1.3 Specification (Per-Fragment Operations and the Frame Buffer) Section 4.2.3 Clearing the Buffers Add alternate suffixed version of ClearDepth. Additions to Chapter 5 of the OpenGL 1.3 Specification (Special Functions) None Additions to Chapter 6 of the OpenGL 1.3 Specification (State and State Requests) None Additions to Appendix A of the OpenGL 1.3 Specification (Invariance) None Additions to the AGL/GLX/WGL Specifications None Additions to the WGL Specification None Additions to the AGL Specification None Additions to Chapter 2 of the GLX 1.3 Specification (GLX Operation) The data representation is client-side only. The GLX layer performs translation between float and double representations. Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors) Additions to Chapter 4 of the GLX 1.3 Specification (Encoding on the X Byte Stream) Additions to Chapter 5 of the GLX 1.3 Specification (Extending OpenGL) Additions to Chapter 6 of the GLX 1.3 Specification (GLX Versions) GLX Protocol Five new GL rendering commands are added. The following commands are sent to the server as part of a glXRender request: ClearDepthfOES 2 8 rendering command length 2 4308 rendering command opcode 4 FLOAT32 z DepthRangefOES 2 12 rendering command length 2 4309 rendering command opcode 4 FLOAT32 n 4 FLOAT32 f FrustumfOES 2 28 rendering command length 2 4310 rendering command opcode 4 FLOAT32 l 4 FLOAT32 r 4 FLOAT32 b 4 FLOAT32 t 4 FLOAT32 n 4 FLOAT32 f OrthofOES 2 28 rendering command length 2 4311 rendering command opcode 4 FLOAT32 l 4 FLOAT32 r 4 FLOAT32 b 4 FLOAT32 t 4 FLOAT32 n 4 FLOAT32 f ClipPlanefOES 2 24 rendering command length 2 4312 rendering command opcode 4 ENUM plane 4 FLOAT32 v[0] 4 FLOAT32 v[1] 4 FLOAT32 v[2] 4 FLOAT32 v[3] The remaining commands are non-rendering commands. These commands are sent separately (i.e., not as part of a glXRender or glXRenderLarge request), using the glXVendorPrivateWithReply request: GetClipPlanefOES 1 CARD8 opcode (X assigned) 1 17 GLX opcode (glXVendorPrivateWithReply) 2 4 request length 4 1421 vendor specific opcode 4 GLX_CONTEXT_TAG context tag 4 ENUM plane => 1 1 reply 1 unused 2 CARD16 sequence number 4 0 reply length 4 FLOAT32 v[0] 4 FLOAT32 v[1] 4 FLOAT32 v[2] 4 FLOAT32 v[3] 8 unused Errors None New State None New Implementation Dependent State None Revision History 03/27/2003 0.1 - First draft created. 07/08/2003 0.2 - Delete unused Dependencies on section - Added extension number 07/09/2003 0.3 - Added missing ClearDepthfOES - Removed '_'s from names. 07/22/2003 0.4 - Added GLX protocol (Thomas Roell)