Publish GLSL_ARM_shader_core_builtins

Change-Id: I33988b29010e274d0e5d906a17f3fed60b952486
Signed-off-by: Kevin Petit <kevin.petit@arm.com>

README.md

@@ -80,3 +80,4 @@ which normatively accepts SPIR-V but does not normatively consume a high-level s
 - [GL_EXT_mesh_shader](https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GLSL_EXT_mesh_shader.txt)
 - [GL_EXT_opacity_micromap](https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GLSL_EXT_opacity_micromap.txt)
 - [GL_NV_shader_invocation_reorder](https://github.com/KhronosGroup/GLSL/blob/master/extensions/nv/GLSL_NV_shader_invocation_reorder.txt)
+- [GL_ARM_shader_core_builtins](https://github.com/KhronosGroup/GLSL/blob/master/extensions/arm/GLSL_ARM_shader_core_builtins.txt)

extensions/arm/GLSL_ARM_shader_core_builtins.txt

@@ -0,0 +1,113 @@
+Name
+
+    ARM_shader_core_builtins
+
+Name Strings
+
+    GL_ARM_shader_core_builtins
+
+Contact
+
+    Kevin Petit (kevin.petit 'at' arm.com), Arm
+
+Contributors
+
+    Kevin Petit, Arm
+    Christopher Gautier, Arm
+
+Status
+
+    Complete
+
+Version
+
+    Last Modified Date: 2022-07-20
+    Revision: 1
+
+Number
+
+    N/A
+
+Dependencies
+
+    This extension can be applied to OpenGL GLSL versions 1.40
+    (#version 140) and higher.
+
+    This extension can be applied to OpenGL ES ESSL versions 3.0
+    (#version 300) and higher.
+
+    This extension is written against revision 7 of the OpenGL Shading Language
+    version 4.50, dated May 9, 2017.
+
+    This extension interacts with revision 36 of the GL_KHR_vulkan_glsl
+    extension, dated February 13, 2017.
+
+Overview
+
+    This extension adds builtin variables that enable shaders to query
+    information about the cores and warps they are running on.
+
+    Mapping to SPIR-V
+    -----------------
+
+    For informational purposes (non-specification), the following is an
+    expected way for an implementation to map GLSL constructs to SPIR-V
+    constructs:
+
+        gl_CoreIDARM -> CoreIDARM decorated OpVariable
+        gl_CoreCountARM -> CoreCountARM decorated OpVariable
+        gl_CoreMaxIDARM -> CoreMaxIDARM decorated OpVariable
+        gl_WarpIDARM -> WarpIDARM decorated OpVariable
+        gl_WarpMaxIDARM -> WarpMaxIDARM decorated OpVariable
+
+Modifications to The OpenGL Shading Language Specification, Version 4.50
+(Revision 7)
+
+    Including the following line in a shader can be used to control the
+    language features described in this extension:
+
+      #extension GL_ARM_shader_core_builtins : <behavior>
+
+    where <behavior> is as specified in section 3.3.
+
+    New preprocessor #defines are added to the OpenGL Shading Language:
+
+      #define GL_ARM_shader_core_builtins         1
+
+    Modify Section 7.1, Built-in Languages Variable, p. 122
+
+    (Add to the list of built-in variables for the compute, vertex,
+     geometry, tessellation control, tessellation evaluation, fragment,
+     ray generation, intersection, any-hit, closest-hit, miss, and callable
+     shading languages)
+
+        highp in uint gl_CoreIDARM;
+        highp in uint gl_CoreCountARM;
+        highp in uint gl_CoreMaxIDARM;
+        highp in uint gl_WarpIDARM;
+        highp in uint gl_WarpMaxIDARM;
+
+    The variable gl_CoreIDARM holds the ID of the shader core the executing
+    invocation is running on.
+    This variable is in the range 0 to gl_CoreMaxIDARM.
+
+    The variable gl_CoreCountARM holds the number of shader cores on the device.
+
+    The variable gl_CoreMaxIDARM holds the max ID of any shader core on the
+    device.
+
+    The variable gl_WarpIDARM holds the warp ID of the executing invocation.
+    This variable is in the range 0 to gl_MaxWarpIDARM.
+
+    The variable gl_WarpMaxIDARM holds the max ID that can be assigned to a
+    warp on the core the executing invocation is running on.
+
+Issues
+
+    None.
+
+Revision History
+
+    Rev.    Date      Author      Changes
+    ----  ----------  --------    -----------------------------------------
+     1    2022-07-20  Kevin Petit Internal revisions.