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/*
* MaplyVertexAttribute.h
* WhirlyGlobe-MaplyComponent
*
* Created by Steve Gifford on 11/29/13.
* Copyright 2011-2022 mousebird consulting
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#import <UIKit/UIKit.h>
/**
Vertex Attributes are passed all the way though on objects to shaders.
If you have your own custom shader, you often need a way to feed it data. The toolkit will set up the standard data, like vertices, texture coordinates and normals, but sometimes you need something custom.
Vertex attributes are the mechanism you use to pass that custom data all the way down to the shader.
How the vertex attributes are used depends on the data type, so consult the appropriate object.
*/
@interface MaplyVertexAttribute : NSObject
/// Construct a vertex attribute as a single float
- (nonnull instancetype)initWithName:(NSString * __nonnull)name slot:(int)slot float:(float)val;
/// Construct a vertex attribute as two floats
- (nonnull instancetype)initWithName:(NSString * __nonnull)name slot:(int)slot floatX:(float)x y:(float)y;
/// Construct a vertex attribute as three flaots
- (nonnull instancetype)initWithName:(NSString * __nonnull)name slot:(int)slot floatX:(float)x y:(float)y z:(float)z;
/// Construct a vertex attribute as an RGBA value
- (nonnull instancetype)initWithName:(NSString * __nonnull)name slot:(int)slot color:(UIColor * __nonnull)color;
/// Construct a vertex attribute as an int
- (nonnull instancetype)initWithName:(NSString * __nonnull)name slot:(int)slot int:(int)val;
@end
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