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Add function glm_perspective_lh_zo

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This commit adds the function `glm_perspective_lh_zo`, modelled on the
implementation of glm_perspective, but amended to provide a left-hand
coordinate system expected by DirectX, Metal and Vulkan (per the GLM
project's `glm/detail/setup.hpp`). It uses a clip-space of zero-to-one.

The function is tested against a longhand version of the algorithm it
seeks to implement as well as against the output of the GLM project's
`glm::perspectiveLH_ZO` function. This commit adds a new subdirectory
`test/glm_cmp` which contains a basic CMake file and `main.cpp`. An
interested user should link or copy or clone the GLM project into this
directory. The `main` function can be used to print the reference data
used so others can verify behaviour in the future, or add new literal
reference values.
This commit is contained in:
michaelg
2021-04-28 23:15:51 +01:00
committed by Tai Chi Minh Ralph Eastwood
parent a242d83805
commit 1bce62c371
9 changed files with 120 additions and 0 deletions
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test/glm_cmp/README.md Normal file
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### Simple GLM app for quick generation of reference values
#### Usage
1. Clone, link or copy the GLM library's root directory to `test/glm_cmp/glm`.
1. Ensuring your current directory is `test/glm_cmp`:
`mkdir build && cd build && cmake .. && make && ./glmcmp`
Please do not delete prior reference-data-producing functions as it may be necessary to return to these to examine future bugs or assumptions. By all means remove or comment-out the call site from the `main` function, though, to focus on what you're working on.