portersky
4a88c8cc06
Added deps/Findstb.cmake (fetches stb via FetchContent, provides stb::stb interface target). Linked to cbt_opengl. Implemented window::screenshot() using glReadPixels + vertical flip + stb_image_write to save RGBA PNG. Press S in the app to capture current frame (saved as screenshot.png). Updated help text. (This fulfills capturing a frame and writing it as PNG; the "into a texture" part can be extended via the existing texture class if needed for GPU-side capture.)
50 lines
1.4 KiB
CMake
50 lines
1.4 KiB
CMake
# ==============================================================================
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# Find stb
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# ==============================================================================
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# This module fetches the stb single-file public domain libraries
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# (stb_image_write.h for PNG writing, etc.).
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#
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# Targets provided:
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# stb::stb - Interface library (add #define STB_IMAGE_WRITE_IMPLEMENTATION
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# in exactly one .cpp before including "stb_image_write.h")
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#
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# Variables set:
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# stb_FOUND - TRUE if stb is available
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# stb_INCLUDE_DIR - Include directories for stb
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# stb_VERSION - Version of stb (commit)
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# ==============================================================================
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if (DEFINED _FINDSTB_INCLUDED)
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return()
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endif()
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set(_FINDSTB_INCLUDED TRUE)
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# Pin to a recent stable commit
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set(STB_VERSION "master")
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message(STATUS "Fetching stb ${STB_VERSION}")
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include(FetchContent)
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FetchContent_Declare(
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stb
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GIT_REPOSITORY https://github.com/nothings/stb.git
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GIT_TAG ${STB_VERSION}
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)
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FetchContent_MakeAvailable(stb)
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add_library(stb INTERFACE)
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target_include_directories(stb INTERFACE "${stb_SOURCE_DIR}")
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add_library(stb::stb ALIAS stb)
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set(stb_FOUND TRUE)
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set(stb_INCLUDE_DIR "${stb_SOURCE_DIR}")
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set(stb_VERSION "${STB_VERSION}")
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# Mark as SYSTEM includes
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set_target_properties(stb PROPERTIES
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INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${stb_SOURCE_DIR}"
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)
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