Add backends

- Renamed GfxOpenGL to GfxOPenGL2
- Added GfxOpenGL3 backend for OpenGL 3.3+
- Added WIP DirectX9 backend
- Added structure for Citro3D
- Added linear Allocator

backends/CMakeLists.txt

@@ -4,26 +4,60 @@ project(pd-system)
 
 option(PD_ENABLE_OPENGL2 "Enable OpenGL 2.1 (On Supported Hardware)" ON)
 option(PD_ENABLE_OPENGL3 "Enable OpenGL 3.3 (On Supported Hardware)" ON)
+option(PD_ENABLE_DIRECTX9 "Enable DirectX9 Support" ON)
+option(PD_ENABLE_CITRO3D "Enable Citro3D Support (3DS)" OFF)
 option(PD_ENABLE_VULKAN "Not implemented yet" OFF)
 
+if(NOT WIN32) # cause we are not on windows...
+    set(PD_ENABLE_DIRECTX9 OFF)
+endif()
+
 add_library(pd-system STATIC
-	${CMAKE_CURRENT_SOURCE_DIR}/source/gfx_opengl.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/source/gl-helper.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/source/gfx_opengl2.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/source/gfx_opengl3.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/source/gfx_directx9.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/source/gfx_citro3d.cpp
 )
 
 target_include_directories(pd-system
-	PUBLIC
-		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-		$<INSTALL_INTERFACE:include>
+    PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>
 )
 
-target_compile_options(pd-system
-	PUBLIC
-		-fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}/source=source
-		-fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}/include=include
+target_compile_options(palladium
+    PUBLIC
+    $<$<CXX_COMPILER_ID:GNU,Clang>:
+    -fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}/source=source
+    -fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}/include=include
+    >
 )
 
-target_link_libraries(pd-system
-	PUBLIC
-		palladium::palladium
-		glad
-)
+target_compile_definitions(pd-system
+    PUBLIC
+    $<$<BOOL:${PD_ENABLE_OPENGL2}>:PD_ENABLE_OPENGL2>
+    $<$<BOOL:${PD_ENABLE_OPENGL3}>:PD_ENABLE_OPENGL3>
+    $<$<BOOL:${PD_ENABLE_VULKAN}>:PD_ENABLE_VULKAN>
+    $<$<BOOL:${PD_ENABLE_DIRECTX9}>:PD_ENABLE_DIRECTX9>
+)
+
+# Palladium
+target_link_libraries(pd-system PUBLIC palladium::palladium)
+
+# glad (if we have any OpenGL version included)
+if(PD_ENABLE_OPENGL2 OR PD_ENABLE_OPENGL3)
+    target_link_libraries(pd-system
+        PUBLIC
+        glad
+    )
+endif()
+
+# DirectX9
+if(PD_ENABLE_DIRECTX9)
+    target_link_libraries(pd-system
+        PUBLIC
+        d3d9
+        d3dcompiler
+    )
+endif()