/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Metal Renderer for Metal Shader Showpiece. Acts as the update and render delegate for the view controller and performs rendering. In MetalShaderShowpiece, the renderer draws a few objects using different shaders.

 */

#import "AAPLView.h"

#import "AAPLViewController.h"

#import "AAPLMesh.h"

#import "AAPLTexture.h"

#import <Metal/Metal.h>

#import "AAPLSharedTypes.h"

static const long kMaxBufferBytesPerFrame = 1024*1024;

static const long kInFlightCommandBuffers = 3;

static const simd::float3 kEye    = {0.0f, 0.0f, 0.0f};

static const simd::float3 kCenter = {0.0f, 0.0f, 1.0f};

static const simd::float3 kUp     = {0.0f, 1.0f, 0.0f};

static const float kFOVY          = 65.0f;

@interface AAPLRenderer : NSObject <AAPLViewControllerDelegate, AAPLViewDelegate>

{

    @protected

        // Global transform data

        id <MTLBuffer> _dynamicConstantBuffer;

        float _rotation;

        BOOL _blending;

        BOOL _depthWriteEnabled;

        id <MTLRenderPipelineState> _pipelineState;

        MTLRenderPipelineReflection *_reflection;

}

// renderer will create a default device at init time.

@property (nonatomic) id <MTLDevice> device;

//  These queries exist so the View can initialize a framebuffer that matches the expectations of the renderer

@property (nonatomic) MTLPixelFormat depthPixelFormat;

@property (nonatomic) MTLPixelFormat stencilPixelFormat;

@property (nonatomic) NSUInteger sampleCount;

@property (nonatomic) NSString *name;

- (instancetype)initWithName:(NSString*)name vertexShader:(NSString*)vertexShaderName fragmentShader:(NSString*)fragmentShaderName mesh:(AAPLMesh*)mesh;

- (instancetype)initWithName:(NSString*)name vertexShader:(NSString*)vertexShaderName fragmentShader:(NSString*)fragmentShaderName mesh:(AAPLMesh*)mesh texture:(AAPLTexture*)texture;

// load all assets before triggering rendering

- (void)configure:(AAPLView *)view;

- (void)initializePipelineStateWithVertexShader:(NSString*)vertexShaderName fragmentShader:(NSString*)fragmentShaderName blending:(BOOL)blending;

- (void)reshape:(AAPLView *)view;

@end