forked from Qortal/Brooklyn
139 lines
3.4 KiB
RPMSpec
139 lines
3.4 KiB
RPMSpec
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Name
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EXT_shader_integer_mix
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Name Strings
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GL_EXT_shader_integer_mix
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Contact
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Matt Turner (matt.turner 'at' intel.com)
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Contributors
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Matt Turner, Intel
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Ian Romanick, Intel
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Status
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Shipping
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Version
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Last Modified Date: 09/12/2013
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Author Revision: 6
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Number
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TBD
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Dependencies
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OpenGL 3.0 or OpenGL ES 3.0 is required. This extension interacts with
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GL_ARB_ES3_compatibility.
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This extension is written against the OpenGL 4.4 (core) specification
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and the GLSL 4.40 specification.
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Overview
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GLSL 1.30 (and GLSL ES 3.00) expanded the mix() built-in function to
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operate on a boolean third argument that does not interpolate but
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selects. This extension extends mix() to select between int, uint,
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and bool components.
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New Procedures and Functions
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None.
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New Tokens
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None.
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Additions to Chapter 8 of the GLSL 4.40 Specification (Built-in Functions)
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Modify Section 8.3, Common Functions
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Additions to the table listing common built-in functions:
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Syntax Description
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--------------------------- --------------------------------------------------
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genIType mix(genIType x, Selects which vector each returned component comes
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genIType y, from. For a component of a that is false, the
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genBType a) corresponding component of x is returned. For a
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genUType mix(genUType x, component of a that is true, the corresponding
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genUType y, component of y is returned.
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genBType a)
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genBType mix(genBType x,
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genBType y,
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genBType a)
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Additions to the AGL/GLX/WGL Specifications
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None.
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Modifications to The OpenGL Shading Language Specification, Version 4.40
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Including the following line in a shader can be used to control the
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language features described in this extension:
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#extension GL_EXT_shader_integer_mix : <behavior>
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where <behavior> is as specified in section 3.3.
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New preprocessor #defines are added to the OpenGL Shading Language:
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#define GL_EXT_shader_integer_mix 1
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Interactions with ARB_ES3_compatibility
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On desktop implementations that support ARB_ES3_compatibility,
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GL_EXT_shader_integer_mix can be enabled (and the new functions
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used) in shaders declared with '#version 300 es'.
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GLX Protocol
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None.
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Errors
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None.
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New State
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None.
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New Implementation Dependent State
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None.
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Issues
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1) Should we allow linear interpolation of integers via a non-boolean
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third component?
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RESOLVED: No.
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2) Should we allow mix() to select between boolean components?
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RESOLVED: Yes. Implementing the same functionality using casts would be
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possible but ugly.
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Revision History
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Rev. Date Author Changes
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---- -------- -------- ---------------------------------------------
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6 09/12/2013 idr After discussions in Khronos, change vendor
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prefix to EXT.
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5 09/09/2013 idr Add ARB_ES3_compatibility interaction.
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4 09/06/2013 mattst88 Allow extension on OpenGL ES 3.0.
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3 08/28/2013 mattst88 Add #extension/#define changes.
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2 08/26/2013 mattst88 Change vendor prefix to MESA. Add mix() that
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selects between boolean components.
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1 08/26/2013 mattst88 Initial revision
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