cmake_minimum_required(VERSION 3.0)
project(renderer_EGL LANGUAGES C CXX)

find_package(PkgConfig)
pkg_check_modules(RENDERER_EGL REQUIRED IMPORTED_TARGET
	egl
	gl
)

pkg_check_modules(RENDERER_EGL_OPT IMPORTED_TARGET
	wayland-egl
)

find_program(AWK NAMES gawk mawk original-awk awk)

if(AWK MATCHES ".+-NOTFOUND")
	message(FATAL_ERROR "FATAL: some known version of awk couldn't be found (${AWK}).")
else()
	message(STATUS "Using awk: ${AWK}")
endif()

include(MakeObject)
function(build_shaders header_dir)
	file(GLOB headers "${header_dir}/*.h")
	set(EGL_SHADER_PROCESSED)
	foreach(shader ${ARGN})
		set(out_f "${CMAKE_CURRENT_BINARY_DIR}/${shader}")
		add_custom_command(OUTPUT "${out_f}"
			COMMAND "${AWK}" -f "${CMAKE_CURRENT_SOURCE_DIR}/glsl.include.awk"
					"${CMAKE_CURRENT_SOURCE_DIR}/${shader}" > "${out_f}"
			MAIN_DEPENDENCY "${CMAKE_CURRENT_SOURCE_DIR}/${shader}"
			DEPENDS ${headers}
			WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/shader"
			COMMENT "Preprocessing shader ${shader}"
			VERBATIM
		)
	endforeach()

	set(CMAKE_CURRENT_SOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
	make_object(
		EGL_SHADER
		${ARGN}
	)

	set(EGL_SHADER_OBJS "${EGL_SHADER_OBJS}" PARENT_SCOPE)
	set(EGL_SHADER_INCS "${EGL_SHADER_INCS}" PARENT_SCOPE)
endfunction()

build_shaders(
	shader
	shader/desktop.vert
	shader/desktop_rgb.frag
	shader/cursor.vert
	shader/cursor_rgb.frag
	shader/cursor_mono.frag
	shader/damage.vert
	shader/damage.frag
	shader/basic.vert
	shader/ffx_cas.frag
	shader/ffx_fsr1_easu.frag
	shader/ffx_fsr1_rcas.frag
	shader/downscale.frag
	shader/downscale_lanczos2.frag
	shader/downscale_linear.frag
)

make_defines(
	"${CMAKE_CURRENT_SOURCE_DIR}/shader/desktop_rgb.frag"
	"${CMAKE_CURRENT_BINARY_DIR}/shader/desktop_rgb.def.h"
)

add_library(renderer_EGL STATIC
	egl.c
	egldebug.c
	shader.c
	texture_util.c
	texture.c
	texture_buffer.c
	texture_framebuffer.c
	texture_dmabuf.c
	model.c
	desktop.c
	desktop_rects.c
	cursor.c
	draw.c
	damage.c
	framebuffer.c
	postprocess.c
	ffx.c
	filter.c
	filter_ffx_cas.c
	filter_ffx_fsr1.c
	filter_downscale.c
	${EGL_SHADER_OBJS}
	"${CMAKE_CURRENT_BINARY_DIR}/shader/desktop_rgb.def.h"
	${PROJECT_TOP}/repos/cimgui/imgui/backends/imgui_impl_opengl3.cpp
)

target_compile_definitions(renderer_EGL PRIVATE CIMGUI_DEFINE_ENUMS_AND_STRUCTS=1 IMGUI_IMPL_OPENGL_ES3)

target_link_libraries(renderer_EGL
	PkgConfig::RENDERER_EGL
	lg_common

	cimgui
)
if(RENDERER_EGL_OPT_FOUND)
	target_link_libraries(renderer_EGL
		PkgConfig::RENDERER_EGL_OPT
	)
endif()

target_include_directories(renderer_EGL
	PRIVATE
		src
		${EGL_SHADER_INCS}
)