create basic OpenGL stuff

CMakeLists.txt

@@ -9,10 +9,12 @@ if (UNIX AND NOT APPLE)
         GN_PLATFORM_LINUX
         GN_WINDOW_X11
 
-        GN_API_VULKAN
+        GN_API_VULKAN GN_API_OPENGL
     )
-    set(VULKAN_BUILT ON)
     add_subdirectory(projects/apis/vulkan/)
+    add_subdirectory(projects/apis/opengl/)
+    set(VULKAN_BUILT ON)
+    set(OPENGL_BUILT ON)
 endif()
 if (APPLE)
     add_compile_definitions(
@@ -39,3 +41,6 @@ endif()
 if (METAL_BUILT)
     target_link_libraries(Gryphn INTERFACE GryphnMetalImpl)
 endif()
+if (OPENGL_BUILT)
+    target_link_libraries(Gryphn INTERFACE GryphnOpenGLImpl)
+endif()

projects/apis/opengl/CMakeLists.txt

@@ -0,0 +1,23 @@
+set(CMAKE_EXPORT_COMPILE_COMMANDS on)
+set(CMAKE_CXX_STANDARD 17)
+project(GryphnOpenGLImpl)
+
+file(GLOB_RECURSE SOURCE_FILES CONFIGURE_DEPENDS
+    "src/*.c"
+)
+file(GLOB_RECURSE LOADER_FILES CONFIGURE_DEPENDS
+    "loader/*.c"
+)
+add_library(GryphnOpenGLImpl STATIC ${SOURCE_FILES} ${LOADER_FILES})
+target_include_directories(GryphnOpenGLImpl PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../core/src/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../core/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../extensions/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../utils/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../platform/
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../
+    ${CMAKE_CURRENT_SOURCE_DIR}/../../../include/
+)
+add_compile_definitions(GN_REVEAL_IMPL)
+target_link_libraries(GryphnOpenGLImpl GL)

projects/apis/opengl/loader/opengl_instance_loader.c

@@ -0,0 +1,16 @@
+#include "opengl_loader.h"
+#include "instance/opengl_instance.h"
+
+gnInstanceFunctions loadOpenGLInstanceFunctions() {
+    return (gnInstanceFunctions){
+        ._gnCreateInstance = createOpenGLInstance,
+        ._gnDestroyInstance = destroyOpenGLInstance,
+        // ._gnGetPhysicalDevices = getMetalDevices,
+        // ._gnQueueCanPresentToSurface = metalCanQueuePresentToSurface,
+        // ._gnCreateOutputDevice = createMetalOutputDevice,
+        // ._gnDestroyOutputDevice = destroyMetalOutputDevice,
+        // ._gnCreateMacOSWindowSurface = createMetalSurface,
+        // ._gnDestroyWindowSurface = destroyMetalWindowSurface,
+        // ._gnGetSurfaceDetails = getMetalSurfaceDetails
+    };
+}

projects/apis/opengl/loader/opengl_loader.h

@@ -0,0 +1,8 @@
+#pragma once
+#include "loader/src/gryphn_instance_functions.h"
+#include "loader/src/gryphn_device_functions.h"
+#include "loader/src/gryphn_command_functions.h"
+
+gnInstanceFunctions loadOpenGLInstanceFunctions();
+gnDeviceFunctions loadOpenGLDeviceFunctions();
+gnCommandFunctions loadOpenGLCommandFunctions();

projects/apis/opengl/src/instance/opengl_instance.c

@@ -0,0 +1,8 @@
+#include "opengl_instance.h"
+
+gnReturnCode createOpenGLInstance(gnInstanceHandle instance, gnInstanceInfo instanceInfo) {
+    return GN_SUCCESS;
+}
+void destroyOpenGLInstance(gnInstanceHandle instance) {
+
+}

projects/apis/opengl/src/instance/opengl_instance.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <GL/gl.h>
+#include "instance/gryphn_instance.h"
+
+typedef struct gnPlatformInstance_t {} gnPlatformInstance;
+
+gnReturnCode createOpenGLInstance(gnInstanceHandle instance, gnInstanceInfo instanceInfo);
+void destroyOpenGLInstance(gnInstanceHandle instance);