Add Back GLFW Support

CMakeLists.txt

@@ -3,7 +3,7 @@ project(gles-compatibility-layer)
 
 # Build
 add_library(gles-compatibility-layer STATIC src/state.c src/passthrough.c src/matrix.c src/draw.c)
-target_link_libraries(gles-compatibility-layer m SDL)
+target_link_libraries(gles-compatibility-layer m)
 target_include_directories(gles-compatibility-layer PUBLIC include)
 # Shaders
 include(cmake/util.cmake)
@@ -11,3 +11,23 @@ embed_resource(gles-compatibility-layer src/shaders/main.vsh)
 embed_resource(gles-compatibility-layer src/shaders/main.fsh)
 # Warnings
 target_compile_options(gles-compatibility-layer PRIVATE -Wall -Wextra -Werror -Wpointer-arith -Wshadow -Wnull-dereference)
+
+# GLFW/SDL
+option(GLES_COMPATIBILITY_LAYER_USE_SDL "Use SDL" TRUE)
+if(GLES_COMPATIBILITY_LAYER_USE_SDL)
+    target_compile_definitions(gles-compatibility-layer PUBLIC GLES_COMPATIBILITY_LAYER_USE_SDL)
+endif()
+
+# Dependencies
+set(GLES_COMPATIBILITY_LAYER_DEPENDENCY "" CACHE STRING "Compatibility Layer Dependency")
+if(NOT GLES_COMPATIBILITY_LAYER_DEPENDENCY)
+    if(gles-compatibility-layer)
+        find_package(SDL2 REQUIRED)
+        target_link_libraries(gles-compatibility-layer SDL2::SDL2)
+    else()
+        find_package(glfw3 3.3 REQUIRED)
+        target_link_libraries(gles-compatibility-layer glfw)
+    endif()
+else()
+    target_link_libraries(gles-compatibility-layer "${GLES_COMPATIBILITY_LAYER_DEPENDENCY}")
+endif()

src/passthrough.h

@@ -1,4 +1,10 @@
+#ifdef GLES_COMPATIBILITY_LAYER_USE_SDL
 #include <SDL.h>
+#else
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+#define SDL_GL_GetProcAddress glfwGetProcAddress
+#endif
 
 #include "log.h"