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feat: add sphere scene with fixed cube-to-sphere mapping

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Added scenes/sphere.{hpp,cpp} using the cube-to-sphere
approach from nrz.cpp, but with corrected math: vertices
are simply normalized to project onto the unit sphere
(the original used a broken formula with p=50.0 as an
exponent).

The sphere uses indexed geometry with position, normal,
and UV attributes, plus a simple diffuse lighting shader.

Press 1/2 to switch between cube and sphere scenes.
Updated .gitignore to exclude generated PNG screenshots.
This commit is contained in:
portersky
2026-05-05 23:54:48 +02:00
parent 4a88c8cc06
commit 78d0515e8b
5 changed files with 264 additions and 5 deletions
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CMakeLists.txt
+11 -1
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@@ -55,10 +55,20 @@ target_compile_options(scenes_cube PRIVATE ${BASE_OPTIONS})
target_compile_definitions(scenes_cube PRIVATE ${BASE_DEFINITIONS})
target_link_libraries(scenes_cube PUBLIC cbt_scene glm::glm)
# Sphere scene
add_library(scenes_sphere STATIC
"scenes/sphere.cpp"
)
target_include_directories(scenes_sphere PRIVATE ".")
target_compile_features(scenes_sphere PRIVATE cxx_std_23)
target_compile_options(scenes_sphere PRIVATE ${BASE_OPTIONS})
target_compile_definitions(scenes_sphere PRIVATE ${BASE_DEFINITIONS})
target_link_libraries(scenes_sphere PUBLIC cbt_scene glm::glm)
# Main executable
add_executable(cuber "cuber.cpp")
target_include_directories(cuber PRIVATE ".")
target_compile_features(cuber PRIVATE cxx_std_23)
target_compile_options(cuber PRIVATE ${BASE_OPTIONS})
target_compile_definitions(cuber PRIVATE ${BASE_DEFINITIONS})
target_link_libraries(cuber PRIVATE cbt_scene scenes_cube asio::asio ${BASE_LIBRARIES})
target_link_libraries(cuber PRIVATE cbt_scene scenes_cube scenes_sphere asio::asio ${BASE_LIBRARIES})