WebRtcXR/Plugin~/unity/include/IUnityGraphics.h

// Unity Native Plugin API copyright © 2015 Unity Technologies ApS
//
// Licensed under the Unity Companion License for Unity - dependent projects--see[Unity Companion License](http://www.unity3d.com/legal/licenses/Unity_Companion_License).
//
// Unless expressly provided otherwise, the Software under this license is made available strictly on an “AS IS” BASIS WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.Please review the license for details on these and other terms and conditions.

#pragma once
#include "IUnityInterface.h"

// Has to match the GfxDeviceRenderer enum
typedef enum UnityGfxRenderer
{
    //kUnityGfxRendererOpenGL            =  0, // Legacy OpenGL, removed
    //kUnityGfxRendererD3D9              =  1, // Direct3D 9, removed
    kUnityGfxRendererD3D11             =  2, // Direct3D 11
    kUnityGfxRendererNull              =  4, // "null" device (used in batch mode)
    kUnityGfxRendererOpenGLES20        =  8, // OpenGL ES 2.0
    kUnityGfxRendererOpenGLES30        = 11, // OpenGL ES 3.0
    //kUnityGfxRendererGXM               = 12, // PlayStation Vita, removed
    kUnityGfxRendererPS4               = 13, // PlayStation 4
    kUnityGfxRendererXboxOne           = 14, // Xbox One
    kUnityGfxRendererMetal             = 16, // iOS Metal
    kUnityGfxRendererOpenGLCore        = 17, // OpenGL core
    kUnityGfxRendererD3D12             = 18, // Direct3D 12
    kUnityGfxRendererVulkan            = 21, // Vulkan
    kUnityGfxRendererNvn               = 22, // Nintendo Switch NVN API
    kUnityGfxRendererXboxOneD3D12      = 23,  // MS XboxOne Direct3D 12
    kUnityGfxRendererGameCoreXboxOne   = 24, // GameCore Xbox One
    kUnityGfxRendererGameCoreXboxSeries  = 25, // GameCore XboxSeries
    kUnityGfxRendererPS5               = 26, // PS5
    kUnityGfxRendererPS5NGGC           = 27  // PS5 NGGC
} UnityGfxRenderer;

typedef enum UnityGfxDeviceEventType
{
    kUnityGfxDeviceEventInitialize     = 0,
    kUnityGfxDeviceEventShutdown       = 1,
    kUnityGfxDeviceEventBeforeReset    = 2,
    kUnityGfxDeviceEventAfterReset     = 3,
} UnityGfxDeviceEventType;

typedef void (UNITY_INTERFACE_API * IUnityGraphicsDeviceEventCallback)(UnityGfxDeviceEventType eventType);

// Should only be used on the rendering thread unless noted otherwise.
UNITY_DECLARE_INTERFACE(IUnityGraphics)
{
    UnityGfxRenderer(UNITY_INTERFACE_API * GetRenderer)();  // Thread safe

    // This callback will be called when graphics device is created, destroyed, reset, etc.
    // It is possible to miss the kUnityGfxDeviceEventInitialize event in case plugin is loaded at a later time,
    // when the graphics device is already created.
    void(UNITY_INTERFACE_API * RegisterDeviceEventCallback)(IUnityGraphicsDeviceEventCallback callback);
    void(UNITY_INTERFACE_API * UnregisterDeviceEventCallback)(IUnityGraphicsDeviceEventCallback callback);
    int(UNITY_INTERFACE_API * ReserveEventIDRange)(int count);  // reserves 'count' event IDs. Plugins should use the result as a base index when issuing events back and forth to avoid event id clashes.
};
UNITY_REGISTER_INTERFACE_GUID(0x7CBA0A9CA4DDB544ULL, 0x8C5AD4926EB17B11ULL, IUnityGraphics)


// Certain Unity APIs (GL.IssuePluginEvent, CommandBuffer.IssuePluginEvent) can callback into native plugins.
// Provide them with an address to a function of this signature.
typedef void (UNITY_INTERFACE_API * UnityRenderingEvent)(int eventId);
typedef void (UNITY_INTERFACE_API * UnityRenderingEventAndData)(int eventId, void* data);