Name Strings

SPV_NV_push_constant_bank

Contact

To report problems with this extension, please open a new issue at:

https://github.com/KhronosGroup/SPIRV-Registry

Contributors

  • Vassili Nikolaev, NVIDIA

Notice

Copyright (c) 2025-2026 The Khronos Group Inc. Copyright terms at http://www.khronos.org/registry/speccopyright.html

Status

  • Complete

Version

Last Modified Date

2025-12-17

Revision

1

Dependencies

This extension is written against the SPIR-V Specification, Version 1.6 Revision 2.

This extension requires SPIR-V 1.0.

Overview

This extension provides a mechanism to specify a bank and member offset for push constant blocks. This allows shaders to access push constants from multiple banks, with each bank having its own offset into the push constant data.

In GLSL, this can be expressed as:

layout(push_constant, bank=0, member_offset=64) uniform Block
{
    layout(offset=0) vec4 a;   // At byte 64 in bank 0
    layout(offset=16) vec4 b;  // At byte 80 in bank 0
};

The BankNV decoration specifies which push constant bank the variable belongs to. The MemberOffsetNV decoration specifies a base offset that is added to member offsets within the block.

Extension Name

To use this extension within a SPIR-V module, the following OpExtension must be present in the module:

OpExtension "SPV_NV_push_constant_bank"

Modifications to the SPIR-V Specification, Version 1.6

Capabilities

Modify Section 3.31, "Capability", adding rows to the Capability table:

Capability Implicitly Declares

5423

PushConstantBanksNV
Uses the BankNV or MemberOffsetNV decorations.

Shader

Decorations

Modify Section 3.20, "Decoration", adding rows to the Decoration table:

Decoration Enabling Capabilities Extra Operands

5397

BankNV
Apply to a variable with PushConstant storage class to specify the push constant bank index. The bank index must be a 32-bit unsigned integer literal. If not present, the bank is assumed to be 0.

PushConstantBanksNV

Literal
Bank

5358

MemberOffsetNV
Apply to a variable with PushConstant storage class to specify a base offset (in bytes) that is added to all member offsets within the block. This allows the block’s members to be located at an offset from the start of the bank’s push constant region. If not present, the member offset is assumed to be 0.

PushConstantBanksNV

Literal
Member Offset

Revision History

Rev Date Author Changes

1

2025-12-17

Vassili Nikolaev

Initial revision