interpolateAtOffset() 偏移参数的范围
range of interpolateAtOffset()'s offset parameter
GLSL 4.6 和 GLSL ES 3.2 规范均表示：
The range and granularity of offsets supported by this function [interpolateAtOffset] is implementation-dependent.
这似乎太开放了，没有用处。我如何才能知道跨多个供应商的实际工作原理是什么？标准中是否至少指定了最低支持范围？如果没有，是否有我可以依赖的主要供应商事实上支持的东西？
对于 Vulkan，the 1.2 specification 需要使用 minInterpolationOffset、maxInterpolationOffset 和 subPixelInterpolationOffsetBits 报告范围和粒度，其中：
The values minInterpolationOffset and maxInterpolationOffset describe the closed interval of supported interpolation offsets: [minInterpolationOffset, maxInterpolationOffset]. The ULP is determined by subPixelInterpolationOffsetBits. If subPixelInterpolationOffsetBits is 4, this provides increments of (1/24) = 0.0625, and thus the range of supported interpolation offsets would be [-0.5, 0.4375].
根据规范要求的这些最小值，如果支持 sampleRateShading，您可以依赖至少 [-0.5, 0.4375] 可用。
对于 OpenGL，the 4.6 specification 表示：
The built-in function interpolateAtOffset will sample variables at a specified (x, y) offset relative to the center of the pixel. The range and granularity of offsets supported by this function is implementation-dependent. If either component of the specified offset is less than the value of MIN_FRAGMENT_INTERPOLATION_OFFSET or greater than the value of MAX_FRAGMENT_INTERPOLATION_OFFSET, the position used to interpolate the variable is undefined. Not all values of offset may be supported; x and y offsets may be rounded to fixed-point values with the number of fraction bits given by the value of the implementation-dependent constant FRAGMENT_INTERPOLATION_OFFSET_BITS.
最低要求与 Vulkan 相同。
尝试搜索 PDF 很痛苦，所以我不会费心去查看 ES 规范，我认为它是一样的。
GLSL 4.6 和 GLSL ES 3.2 规范均表示：
The range and granularity of offsets supported by this function [interpolateAtOffset] is implementation-dependent.
这似乎太开放了，没有用处。我如何才能知道跨多个供应商的实际工作原理是什么？标准中是否至少指定了最低支持范围？如果没有，是否有我可以依赖的主要供应商事实上支持的东西？
对于 Vulkan，the 1.2 specification 需要使用 minInterpolationOffset、maxInterpolationOffset 和 subPixelInterpolationOffsetBits 报告范围和粒度，其中：
The values
minInterpolationOffsetandmaxInterpolationOffsetdescribe the closed interval of supported interpolation offsets: [minInterpolationOffset,maxInterpolationOffset]. The ULP is determined bysubPixelInterpolationOffsetBits. IfsubPixelInterpolationOffsetBitsis 4, this provides increments of (1/24) = 0.0625, and thus the range of supported interpolation offsets would be [-0.5, 0.4375].
根据规范要求的这些最小值，如果支持 sampleRateShading，您可以依赖至少 [-0.5, 0.4375] 可用。
对于 OpenGL，the 4.6 specification 表示：
The built-in function interpolateAtOffset will sample variables at a specified (x, y) offset relative to the center of the pixel. The range and granularity of offsets supported by this function is implementation-dependent. If either component of the specified offset is less than the value of
MIN_FRAGMENT_INTERPOLATION_OFFSETor greater than the value ofMAX_FRAGMENT_INTERPOLATION_OFFSET, the position used to interpolate the variable is undefined. Not all values of offset may be supported; x and y offsets may be rounded to fixed-point values with the number of fraction bits given by the value of the implementation-dependent constantFRAGMENT_INTERPOLATION_OFFSET_BITS.
最低要求与 Vulkan 相同。
尝试搜索 PDF 很痛苦，所以我不会费心去查看 ES 规范，我认为它是一样的。