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MetalShaderShowcase/AAPLCubeMesh.mm

/*
Copyright (C) 2016 Apple Inc. All Rights Reserved.
See LICENSE.txt for this sample’s licensing information

Abstract:
A class to represent a cube mesh used for drawing.
*/

#import "AAPLCubeMesh.h"

const int num_cube_indices = 36;
const int num_cube_vertices = 24;
const int num_cube_normals = 24;
const int num_cube_uvs = 24;

float cube_vertices[] = {
//Left
-1, -1, -1,
-1, 1, -1,
-1, 1, 1,
-1, -1, 1,

//Right
1, -1, 1,
1, 1, 1,
1, 1, -1,
1, -1, -1,

//Bottom
-1, -1, -1,
-1, -1, 1,
1, -1, 1,
1, -1, -1,

//Top
-1, 1, -1,
1, 1, -1,
1, 1, 1,
-1, 1, 1,

//Back
1, -1, -1,
1, 1, -1,
-1, 1, -1,
-1, -1, -1,

//Front
-1, -1, 1,
-1, 1, 1,
1, 1, 1,
1, -1, 1
};

float cube_uvs[] = {
//Left
0, 0,
0, 1,
1, 1,
1, 0,

//Right
0, 0,
0, 1,
1, 1,
1, 0,

//Bottom
0, 0,
0, 1,
1, 1,
1, 0,

//Top
0, 0,
0, 1,
1, 1,
1, 0,

//Back
0, 0,
0, 1,
1, 1,
1, 0,

//Front
0, 0,
0, 1,
1, 1,
1, 0,
};

short cube_indices[] = {
//Left
0, 1, 2,
0, 2, 3,

//Right
4, 5, 6,
4, 6, 7,

//Bottom
8, 9, 10,
8, 10, 11,

//Top
12, 13, 14,
12, 14, 15,

//Back
16, 17, 18,
16, 18, 19,

//Front
20, 21, 22,
20, 22, 23
};

float cube_tangents[] = {
//Left
0, 0, 1,
0, 0, 1,
0, 0, 1,
0, 0, 1,

//Right
0, 0, -1,
0, 0, -1,
0, 0, -1,
0, 0, -1,

//Bottom
1, 0, 0,
1, 0, 0,
1, 0, 0,
1, 0, 0,

//Top
1, 0, 0,
1, 0, 0,
1, 0, 0,
1, 0, 0,

//Back
-1, 0, 0,
-1, 0, 0,
-1, 0, 0,
-1, 0, 0,

//Front
1, 0, 0,
1, 0, 0,
1, 0, 0,
1, 0, 0
};

float cube_bitangents[] = {
//Left
0, 1, 0,
0, 1, 0,
0, 1, 0,
0, 1, 0,

//Right
0, 1, 0,
0, 1, 0,
0, 1, 0,
0, 1, 0,

//Bottom
0, 0, 1,
0, 0, 1,
0, 0, 1,
0, 0, 1,

//Top
0, 0, -1,
0, 0, -1,
0, 0, -1,
0, 0, -1,

//Back
0, 1, 0,
0, 1, 0,
0, 1, 0,
0, 1, 0,

//Front
0, 1, 0,
0, 1, 0,
0, 1, 0,
0, 1, 0
};

float cube_normals[] = {
//Left
-1, 0, 0,
-1, 0, 0,
-1, 0, 0,
-1, 0, 0,

//Right
1, 0, 0,
1, 0, 0,
1, 0, 0,
1, 0, 0,

//Bottom
0, -1, 0,
0, -1, 0,
0, -1, 0,
0, -1, 0,

//Top
0, 1, 0,
0, 1, 0,
0, 1, 0,
0, 1, 0,

//Back
0, 0, -1,
0, 0, -1,
0, 0, -1,
0, 0, -1,

//Front
0, 0, 1,
0, 0, 1,
0, 0, 1,
0, 0, 1
};

unsigned int sizeof_cube_vertices = sizeof(cube_vertices);
unsigned int sizeof_cube_normals = sizeof(cube_normals);
unsigned int sizeof_cube_uvs = sizeof(cube_uvs);
unsigned int sizeof_cube_indices = sizeof(cube_indices);
unsigned int sizeof_cube_tangents = sizeof(cube_tangents);
unsigned int sizeof_cube_bitangents = sizeof(cube_bitangents);


@interface AAPLCubeMesh ()

- (instancetype)initWithDevice:(id <MTLDevice>)device;

@end

@implementation AAPLCubeMesh

+ (instancetype)sharedInstance
{
static AAPLCubeMesh *cubeMesh = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
id <MTLDevice> device = MTLCreateSystemDefaultDevice();
cubeMesh = [[self alloc] initWithDevice:device];
});
return cubeMesh;
}

- (instancetype)initWithDevice:(id <MTLDevice>)device
{
self = [super init];

self.vertex_buffer = [device newBufferWithBytes:cube_vertices length:sizeof_cube_vertices options:MTLResourceOptionCPUCacheModeDefault];
self.vertex_buffer.label = @"Vertices";

self.normal_buffer = [device newBufferWithBytes:cube_normals length:sizeof_cube_normals options:MTLResourceOptionCPUCacheModeDefault];
self.normal_buffer.label = @"Normals";

self.tangents_buffer = [device newBufferWithBytes:cube_tangents length:sizeof_cube_tangents options:MTLResourceOptionCPUCacheModeDefault];
self.tangents_buffer.label = @"Tangents";

self.bitangents_buffer = [device newBufferWithBytes:cube_bitangents length:sizeof_cube_bitangents options:MTLResourceOptionCPUCacheModeDefault];
self.bitangents_buffer.label = @"Bitangents";

self.uv_buffer = [device newBufferWithBytes:cube_uvs length:sizeof_cube_uvs options:MTLResourceOptionCPUCacheModeDefault];
self.uv_buffer.label = @"UVs";

self.index_buffer = [device newBufferWithBytes:cube_indices length:sizeof_cube_indices options:MTLResourceOptionCPUCacheModeDefault];
self.index_buffer.label = @"Indices";

self.index_count = num_cube_indices;
self.vertex_count = num_cube_vertices;
self.primitive_type = MTLPrimitiveTypeTriangle;

self.translate_x = 0.0f;
self.translate_y = 0.0f;
self.translate_z = 6.0f;

self.indices = cube_indices;
self.vertices = cube_vertices;
self.normals = cube_normals;
self.uvs = cube_uvs;
self.tangents = cube_tangents;
self.bitangents = cube_bitangents;

return self;
}

@end

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