56 lines
2.4 KiB
CMake
56 lines
2.4 KiB
CMake
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# WASM shader override.
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#
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# Redefines add_shader() to convert GLSL 1.20 -> GLSL ES 3.0 before embedding the shader as a
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# C++ string, so common/gal/CMakeLists.txt's unconditional add_shader() calls produce ES3
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# shaders on Emscripten while native keeps the upstream GLSL-1.20 path. The later definition
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# wins, so this file must be include()d AFTER upstream's add_shader() definition and BEFORE the
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# add_shader() calls. (Same conversion as tests/gal-regression/wasm/generate_shaders.py.)
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#
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# include()d (not add_subdirectory'd) from common/gal/CMakeLists.txt, so ${CMAKE_CURRENT_SOURCE_DIR}
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# / ${CMAKE_CURRENT_BINARY_DIR} below resolve to that directory, exactly as the inline fork did.
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find_program( PYTHON3_EXECUTABLE python3 REQUIRED )
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function( add_shader outTarget inFile shaderName )
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# Determine shader type from filename
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string(FIND "${inFile}" "frag" _is_frag)
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if(_is_frag GREATER -1)
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set(SHADER_TYPE "fragment")
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else()
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set(SHADER_TYPE "vertex")
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endif()
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set(es3GlslFile "${CMAKE_CURRENT_BINARY_DIR}/${shaderName}_es3.glsl")
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set(outCppName "${shaderName}.cpp")
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set(outHeaderName "${shaderName}.h")
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# Step 1: Convert GLSL 120 -> ES 3.0
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add_custom_command(
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OUTPUT ${es3GlslFile}
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COMMAND ${PYTHON3_EXECUTABLE}
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${CMAKE_CURRENT_SOURCE_DIR}/shaders/convert_glsl_es3.py
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${CMAKE_CURRENT_SOURCE_DIR}/shaders/${inFile}
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${es3GlslFile}
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${SHADER_TYPE}
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DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/shaders/${inFile}
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${CMAKE_CURRENT_SOURCE_DIR}/shaders/convert_glsl_es3.py
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)
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# Step 2: Embed as C++ string (same as native path)
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add_custom_command(
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OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${outCppName}
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${CMAKE_BINARY_DIR}/include/gal/shaders/${outHeaderName}
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COMMAND ${CMAKE_COMMAND}
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-DSOURCE_FILE="${es3GlslFile}"
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-DOUT_CPP_DIR="${CMAKE_CURRENT_BINARY_DIR}/"
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-DOUT_HEADER_DIR="${CMAKE_BINARY_DIR}/include/gal/shaders/"
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-DOUT_CPP_FILENAME="${outCppName}"
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-DOUT_HEADER_FILENAME="${outHeaderName}"
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-DOUT_VAR_NAME="${shaderName}"
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-P ${KICAD_CMAKE_MODULE_PATH}/BuildSteps/CreateShaderCpp.cmake
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DEPENDS ${es3GlslFile}
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)
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target_sources( ${outTarget} PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/${outCppName} )
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target_include_directories( ${outTarget} PUBLIC ${CMAKE_BINARY_DIR}/include/gal/shaders/ )
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endfunction()
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