- Last Modified Date
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2020-08-14
- IP Status
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No known IP claims.
- Interactions and External Dependencies
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This extension provides API support for {GLSLregistry}/ext/GLSL_EXT_shader_atomic_float2.txt[
GLSL_EXT_shader_atomic_float2]
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- Contributors
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Faith Ekstrand, Intel
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This extension allows a shader to perform 16-bit floating-point atomic operations on buffer and workgroup memory as well as floating-point atomic minimum and maximum operations on buffer, workgroup, and image memory. It advertises the SPIR-V code:AtomicFloat16AddEXT capability which allows atomic add operations on 16-bit floating-point numbers and the SPIR-V code:AtomicFloat16MinMaxEXT, code:AtomicFloat32MinMaxEXT and code:AtomicFloat64MinMaxEXT capabilities which allow atomic minimum and maximum operations on floating-point numbers. The supported operations include code:OpAtomicFAddEXT, code:OpAtomicFMinEXT and code:OpAtomicFMaxEXT.
1) Should this extension add support for 16-bit image atomics?
RESOLVED: No. While Vulkan supports creating storage images with ename:VK_FORMAT_R16_SFLOAT and doing load and store on them, the data in the shader has a 32-bit representation. Vulkan currently has no facility for even basic reading or writing such images using 16-bit float values in the shader. Adding such functionality would be required before 16-bit image atomics would make sense and is outside the scope of this extension.