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A user found that the `Texture2D<float2>.Load(...)` operation was not being compiled to GLSL properly, such that it returned a `vec4` instead of the expected `vec2`.
The GLSL texture-related functions always return (and take) 4-component vectors, and we already have infrastructure in `emit.cpp` for recognizing a `$z` operator in the GLSL intrinsic definition to stand in for an appropriate swizzle based on teh number of components in the texture result type.
This change just adds that `$z` operator to the GLSL code for several more texture operations (including `Load()`) that are defined on a `Texture*<T>` and that return `T`.
This change doesn't try to add additional GLSL translations for texture-related operations (e.g., additional variations like `SampleCmp` that we have defined in the stdlib but not given GLSL translations for). That work still needs to be done.
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