[client] use cmake to generate renderers/fonts/clipboards headers/code

This is in preperation of cmake options to enable/disable various
functionallity.

client/renderers/CMakeLists.txt

@@ -1,11 +1,48 @@
 cmake_minimum_required(VERSION 3.0)
 project(renderers LANGUAGES C)
 
-add_subdirectory(opengl)
-add_subdirectory(egl)
+set(RENDERER_H "${CMAKE_BINARY_DIR}/include/dynamic/renderers.h")
+set(RENDERER_C "${CMAKE_BINARY_DIR}/src/renderers.c")
 
-add_library(renderers INTERFACE)
-target_link_libraries(renderers INTERFACE
-	renderer_opengl
-	renderer_egl
+file(WRITE  ${RENDERER_H} "#include \"interface/renderer.h\"\n\n")
+file(APPEND ${RENDERER_H} "extern LG_Renderer * LG_Renderers[];\n\n")
+
+file(WRITE  ${RENDERER_C} "#include \"interface/renderer.h\"\n\n")
+file(APPEND ${RENDERER_C} "#include <stddef.h>\n\n")
+
+set(RENDERERS)
+set(RENDERERS_LINK)
+function(add_renderer name)
+  set(RENDERERS      "${RENDERERS};${name}" PARENT_SCOPE)
+  set(RENDERERS_LINK "${RENDERERS_LINK};renderer_${name}" PARENT_SCOPE)
+  add_subdirectory(${name})
+endfunction()
+
+# Add/remove renderers here!
+add_renderer(EGL)
+add_renderer(OpenGL)
+
+list(REMOVE_AT RENDERERS      0)
+list(REMOVE_AT RENDERERS_LINK 0)
+
+list(LENGTH RENDERERS RENDERER_COUNT)
+file(APPEND ${RENDERER_H} "#define LG_RENDERER_COUNT ${RENDERER_COUNT}\n")
+
+foreach(renderer ${RENDERERS})
+  file(APPEND ${RENDERER_C} "extern LG_Renderer LGR_${renderer};\n")
+endforeach()
+
+file(APPEND ${RENDERER_C} "\nconst LG_Renderer * LG_Renderers[] =\n{\n")
+foreach(renderer ${RENDERERS})
+  file(APPEND ${RENDERER_C} "  &LGR_${renderer},\n")
+endforeach()
+file(APPEND ${RENDERER_C} "  NULL\n};")
+
+
+add_library(renderers STATIC
+	${RENDERER_C}
+)
+
+target_link_libraries(renderers
+	${RENDERERS_LINK}
 )