embed shaders in binary

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.21)
 project(toddcox-visualize)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 
 include(FetchContent)
 
@@ -14,33 +14,8 @@ include(External/imgui.cmake)
 include(External/json.cmake)
 include(External/peglib.cmake)
 
-#include_directories(include)
+include(embed.cmake)
 
 enable_testing()
 add_subdirectory(tc)
 add_subdirectory(vis)
-
-#add_custom_target(resources DEPENDS resources_output)
-#add_custom_command(
-#    OUTPUT resources_output
-#    COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/res ${CMAKE_CURRENT_BINARY_DIR}/res
-#    COMMENT "Copying Resources")
-#
-#add_executable(vis
-#    src/main.cpp
-#    src/gl/debug.hpp
-#    src/gl/shader.hpp
-#    src/gl/buffer.hpp
-#    src/gl/vertexarray.hpp
-#    src/gl/types.hpp)
-#target_link_libraries(vis glfw glad imgui eigen nlohmann_json)
-#add_dependencies(vis resources)
-
-#add_executable(serial src/serialtest.cpp)
-#target_link_libraries(serial eigen nlohmann_json)
-
-#add_executable(combotest src/combotest.cpp)
-#target_link_libraries(combotest eigen tc)
-
-#add_executable(geometrytest src/geometrytest.cpp)
-#target_link_libraries(geometrytest eigen tc nlohmann_json)

embed.cmake

@@ -0,0 +1,91 @@
+find_program(EMBED_LD ${CMAKE_LINKER})
+find_program(EMBED_OBJCOPY ${CMAKE_OBJCOPY})
+
+function(_generate_embed_source EMBED_NAME)
+  set(options)
+  set(oneValueArgs SOURCE HEADER)
+  set(multiValueArgs FILES SYMBOLS)
+  cmake_parse_arguments(PARSE "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+  set(VIEW_DECLARATIONS)
+  set(VOID_DECLARATIONS)
+  set(DEFINITIONS)
+
+  foreach (FILE SYMBOL IN ZIP_LISTS PARSE_FILES PARSE_SYMBOLS)
+    get_filename_component(FILE_NAME "${FILE}" NAME)
+    string(MAKE_C_IDENTIFIER "${FILE_NAME}" IDENTIFIER)
+
+    set(START_SYMBOL "_binary_${SYMBOL}_start")
+    set(END_SYMBOL "_binary_${SYMBOL}_end")
+
+    string(APPEND VIEW_DECLARATIONS
+      "  /// ${FILE} Text Contents\n"
+      "  extern std::string_view const ${IDENTIFIER};\n")
+
+    string(APPEND VOID_DECLARATIONS
+      "  /// ${FILE} Binary Contents\n"
+      "  extern void* const ${IDENTIFIER};\n")
+
+    string(APPEND DEFINITIONS
+      "// ${IDENTIFIER} (${FILE})\n"
+      "extern \"C\" const char ${START_SYMBOL}[], ${END_SYMBOL}[];\n"
+      "std::string_view const ${EMBED_NAME}::${IDENTIFIER}(${START_SYMBOL}, ${END_SYMBOL});\n"
+      "void* const ${EMBED_NAME}::bin::${IDENTIFIER} = (void *) ${START_SYMBOL};\n\n")
+  endforeach ()
+
+  file(WRITE "${PARSE_HEADER}"
+    "#pragma once\n"
+    "#include <string>\n\n"
+    "namespace ${EMBED_NAME} {\n${VIEW_DECLARATIONS}}\n\n"
+    "namespace ${EMBED_NAME}::bin {\n${VOID_DECLARATIONS}}\n")
+
+  file(WRITE "${PARSE_SOURCE}"
+    "#include <${EMBED_NAME}.hpp>\n\n"
+    "${DEFINITIONS}")
+endfunction()
+
+function(_embed_file OUTPUT_OBJECT OUTPUT_SYMBOL FILE)
+  set(OBJECT "${CMAKE_CURRENT_BINARY_DIR}/${FILE}.o")
+  string(MAKE_C_IDENTIFIER "${FILE}" SYMBOL)
+
+  set(${OUTPUT_OBJECT} ${OBJECT} PARENT_SCOPE)
+  set(${OUTPUT_SYMBOL} ${SYMBOL} PARENT_SCOPE)
+
+  add_custom_command(
+    COMMENT "Embedding ${FILE} in ${OBJECT}"
+    OUTPUT "${FILE}.o" DEPENDS "${FILE}"
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+    COMMAND ${EMBED_LD} -r -o "${OBJECT}" -z noexecstack --format=binary "${FILE}"
+    COMMAND ${EMBED_OBJCOPY} --rename-section .data=.rodata,alloc,load,readonly,data,contents "${OBJECT}"
+    VERBATIM
+  )
+endfunction()
+
+function(add_embed_library EMBED_NAME)
+  set(FILES ${ARGN})
+
+  set(EMBED_ROOT ${CMAKE_CURRENT_BINARY_DIR}/_embed/${EMBED_NAME})
+  set(EMBED_SOURCE "${EMBED_ROOT}/${EMBED_NAME}.cpp")
+  set(EMBED_INCLUDE "${EMBED_ROOT}/include")
+  set(EMBED_HEADER "${EMBED_INCLUDE}/${EMBED_NAME}.hpp")
+
+  set(OBJECTS)
+  set(SYMBOLS)
+  foreach (FILE ${ARGN})
+    _embed_file(OBJECT SYMBOL ${FILE})
+    list(APPEND OBJECTS ${OBJECT})
+    list(APPEND SYMBOLS ${SYMBOL})
+  endforeach ()
+
+  message(STATUS "Generating embedding library ${EMBED_NAME}")
+  _generate_embed_source(
+    ${EMBED_NAME}
+    SOURCE ${EMBED_SOURCE}
+    HEADER ${EMBED_HEADER}
+    FILES ${FILES}
+    SYMBOLS ${SYMBOLS})
+
+  add_library(${EMBED_NAME} STATIC ${OBJECTS} "${EMBED_SOURCE}")
+  target_include_directories(${EMBED_NAME} PUBLIC "${EMBED_INCLUDE}")
+  set_target_properties(${EMBED_NAME} PROPERTIES POSITION_INDEPENDENT_CODE ON)
+endfunction()

vis/CMakeLists.txt

@@ -1,8 +1,4 @@
-add_custom_target(resources DEPENDS resources_output)
+add_subdirectory(shaders)
-add_custom_command(
-    OUTPUT resources_output
-    COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/res ${CMAKE_CURRENT_BINARY_DIR}/res
-    COMMENT "Copying Resources")
 
 add_executable(vis
     src/main.cpp
@@ -15,6 +11,6 @@ target_link_libraries(vis
     imgui
     eigen
     nlohmann_json
+    shaders
     )
 target_include_directories(vis PUBLIC include)
-add_dependencies(vis resources)

vis/include/gl/shader.hpp

@@ -23,6 +23,17 @@ public:
         // todo throw if compile failed
     }
 
+    explicit Shader(const std::string_view &src) {
+        id = glCreateShader(mode);
+
+        const char *str = src.data();
+        const GLint length = (GLint) src.length();
+        glShaderSource(id, 1, &str, &length);
+        glCompileShader(id);
+
+        // todo throw if compile failed
+    }
+
     explicit Shader(std::ifstream source)
         : Shader(std::string(
         std::istreambuf_iterator<char>(source),

vis/shaders/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_embed_library(shaders
+    main-4d.vert.glsl
+    main.vert.glsl
+    main.frag.glsl)

vis/src/render/pointrender.hpp

@@ -7,6 +7,8 @@
 
 #include <fstream>
 
+#include <shaders.hpp>
+
 struct State {
     Eigen::Vector4f bg{0.16, 0.16, 0.16, 1.00};
     Eigen::Vector4f fg{0.71, 0.53, 0.94, 1.00};
@@ -39,8 +41,8 @@ template<typename V_=Eigen::Vector4f>
 struct PointRenderer {
     using Vertex = V_;
 
-    VertexShader vs{std::ifstream("res/shaders/main.vert.glsl")};
+    VertexShader vs{shaders::main_vert_glsl};
-    FragmentShader fs{std::ifstream("res/shaders/main.frag.glsl")};
+    FragmentShader fs{shaders::main_frag_glsl};
 
     Program pgm{vs, fs};