[nx] deko3d imgui backend added

added:
- deko3d imgui backend (thanks ftpd)
- controller input support

see #70

README.md

@@ -179,3 +179,4 @@ gba emulator witten in c++23.
 - ocornut for imgui <https://github.com/ocornut/imgui>
 - ocornut for imgui_club <https://github.com/ocornut/imgui_club>
 - everyone that has contributed to the bios decomp <https://github.com/Gericom/gba_bios>
+- [ftpd](https://github.com/mtheall/ftpd) and [nxshell](https://github.com/joel16/NX-Shell) for the deko3d backend for switch.

src/frontend/CMakeLists.txt

@@ -82,8 +82,13 @@ else()
         target_link_libraries(main PRIVATE ${minizip_lib})
         target_include_directories(main PRIVATE ${minizip_inc})
 
+        # on switch, i need to manually link against
+        # zlib as well, and has to be linked after minizip!
+        find_package(ZLIB REQUIRED)
+        target_link_libraries(main PRIVATE ZLIB::ZLIB)
+
         set(FOUND_MINIZIP TRUE)
-        message(STATUS "using system minizip")
+        message(STATUS "using system minizip lib: ${minizip_lib} inc: ${minizip_inc}")
     endif()
 endif()
 
@@ -127,3 +132,35 @@ target_compile_definitions(main PRIVATE
     DUMP_AUDIO=$<BOOL:${DUMP_AUDIO}>
     DEBUGGER=$<BOOL:${DEBUGGER}>
 )
+
+if (NINTENDO_SWITCH)
+    # create romfs folder
+    dkp_add_asset_target(main_romfs ${CMAKE_CURRENT_BINARY_DIR}/romfs)
+
+    # setup nacp
+    nx_generate_nacp(main.nacp
+        NAME "Notorious BEEG"
+        AUTHOR TotalJustice
+        VERSION 0.0.3
+    )
+
+    # create nro (final binary)
+    nx_create_nro(main
+        ICON ${CMAKE_SOURCE_DIR}/src/frontend/backend/nx/icon.jpg
+        NACP main.nacp
+        ROMFS main_romfs
+    )
+
+    # compile and add shaders to romfs
+    set(SHADER_FOLDER ${CMAKE_SOURCE_DIR}/src/frontend/backend/nx/shaders)
+
+    nx_add_shader_program(imgui_fsh ${SHADER_FOLDER}/imgui_fsh.glsl frag)
+    nx_add_shader_program(imgui_vsh ${SHADER_FOLDER}/imgui_vsh.glsl vert)
+
+    dkp_install_assets(main_romfs
+        DESTINATION shaders
+        TARGETS
+            imgui_fsh
+            imgui_vsh
+    )
+endif()

src/frontend/backend/CMakeLists.txt

@@ -1,3 +1,7 @@
 cmake_minimum_required(VERSION 3.20.0)
 
-add_subdirectory(sdl2)
+if (NINTENDO_SWITCH)
+    add_subdirectory(nx)
+else()
+    add_subdirectory(sdl2)
+endif()

src/frontend/backend/sdl2/backend_sdl2.hpp → src/frontend/backend/backend.hpp

@@ -2,12 +2,12 @@
 // SPDX-License-Identifier: GPL-3.0-only
 #pragma once
 
-#include "../../system.hpp"
+#include "../system.hpp"
 #include <cstdint>
 #include <span>
 #include <utility>
 
-namespace sys::backend::sdl2 {
+namespace sys::backend {
 
 [[nodiscard]] auto init() -> bool;
 auto quit() -> void;
@@ -28,4 +28,4 @@ auto toggle_fullscreen() -> void;
 
 auto open_url(const char* url) -> void;
 
-} // sys::backend::sdl2
+} // sys::backend

src/frontend/backend/nx/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.20.0)
+
+add_library(backend
+    backend_nx.cpp
+    ftpd_imgui/imgui_deko3d.cpp
+    ftpd_imgui/imgui_nx.cpp
+)
+
+target_link_libraries(backend PRIVATE imgui)
+target_link_libraries(backend PRIVATE GBA)
+target_link_libraries(backend PRIVATE deko3dd)
+
+# why is this even needed???
+target_include_directories(backend PRIVATE ${DEVKITPRO}/portlibs/switch/include)
+
+target_apply_lto_in_release(backend)