//
//   Copyright 2015 Pixar
//
//   Licensed under the terms set forth in the LICENSE.txt file available at
//   https://opensubdiv.org/license.
//

#pragma once

#import <Foundation/Foundation.h>
#import <Metal/Metal.h>

typedef enum {
    kEndCapBilinearBasis = 0,
    kEndCapBSplineBasis,
    kEndCapGregoryBasis,
    kEndCapLegacyGregory,
} EndCap;

typedef enum {
    kFVarLinearNone = 0,
    kFVarLinearCornersOnly,
    kFVarLinearCornersPlus1,
    kFVarLinearCornersPlus2,
    kFVarLinearBoundaries,
    kFVarLinearAll
} FVarLinearInterp;

typedef enum {
    kCPU = 0,
    kMetal,
} KernelType;

typedef enum {
    kDisplayStyleWire = 0,
    kDisplayStyleShaded,
    kDisplayStyleWireOnShaded,
} DisplayStyle;

typedef enum {
    kShadingMaterial = 0,
    kShadingFaceVaryingColor,
    kShadingPatchType,
    kShadingPatchDepth,
    kShadingPatchCoord,
    kShadingNormal,
} ShadingMode;

typedef struct {
    float rotationX;
    float rotationY;
    float dollyDistance;
    float aspectRatio;
} Camera;

@class OSDRenderer;

@protocol OSDRendererDelegate <NSObject>
-(id<MTLDevice>)deviceFor:(OSDRenderer*)renderer;
-(id<MTLCommandQueue>)commandQueueFor:(OSDRenderer*)renderer;
-(MTLRenderPassDescriptor*)renderPassDescriptorFor:(OSDRenderer*)renderer;
-(void)setupDepthStencilState:(MTLDepthStencilDescriptor*)descriptor for:(OSDRenderer*)renderer;
-(void)setupRenderPipelineState:(MTLRenderPipelineDescriptor*)descriptor for:(OSDRenderer*)renderer;
@end

@interface OSDRenderer : NSObject

-(instancetype)initWithDelegate:(id<OSDRendererDelegate>)delegate;

-(id<MTLRenderCommandEncoder>)drawFrame:(id<MTLCommandBuffer>)commandBuffer;

-(void)fitFrame;

@property (readonly, nonatomic) id<OSDRendererDelegate> delegate;

@property (nonatomic) unsigned refinementLevel;
@property (nonatomic) int tessellationLevel;

@property (readonly, nonatomic) NSArray<NSString*>* loadedModels;
@property (nonatomic) NSString* currentModel;

@property (readonly, nonatomic) Camera* camera;

@property (readonly, nonatomic) int* patchCounts;

@property (nonatomic) bool useFractionalTessellation;
@property (nonatomic) bool useScreenspaceTessellation;
@property (nonatomic) bool usePatchIndexBuffer;
@property (nonatomic) bool usePatchBackfaceCulling;
@property (nonatomic) bool usePatchClipCulling;
@property (nonatomic) bool useSmoothCornerPatch;
@property (nonatomic) bool useSingleCreasePatch;
@property (nonatomic) bool useInfinitelySharpPatch;
@property (nonatomic) bool useStageIn;
@property (nonatomic) bool usePrimitiveBackfaceCulling;
@property (nonatomic) bool useAdaptive;
@property (nonatomic) bool yup;
@property (nonatomic) bool freeze;
@property (nonatomic) bool animateVertices;
@property (nonatomic) bool displayControlMeshEdges;
@property (nonatomic) bool displayControlMeshVertices;
@property (nonatomic) bool legacyGregoryEnabled;
@property (nonatomic) DisplayStyle displayStyle;
@property (nonatomic) ShadingMode shadingMode;
@property (nonatomic) EndCap endCapMode;
@property (nonatomic) FVarLinearInterp fVarLinearInterp;
@property (nonatomic) KernelType kernelType;

@end