/*

 Copyright (C) 2015 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Utility class for compiling a GL shader from a source string.

 */

#import <OpenGL/OpenGL.h>

@interface GLShader : NSObject

// Create a shader from a source file

- (nullable instancetype) initWithSource:(nullable const GLchar *)source

                                    type:(const GLenum)type;

+ (nullable instancetype) shaderWithSource:(nullable const GLchar *)source

                                      type:(const GLenum)type;

// Create a shader from a source file located at a URL

- (nullable instancetype) initWithURL:(nullable NSURL *)url

                                 type:(const GLenum)type;

+ (nullable instancetype) shaderWithURL:(nullable NSURL *)url

                                   type:(const GLenum)type;

// Create a shader from a source file located at an absolute path

- (nullable instancetype) initWithFile:(nullable NSString *)path

                                  type:(const GLenum)type;

+ (nullable instancetype) shaderWithFile:(nullable NSString *)path

                                    type:(const GLenum)type;

// Create a shader from a source file in application's bundle

- (nullable instancetype) initWithResource:(nullable NSString *)name

                                      type:(const GLenum)type;

+ (nullable instancetype) shaderWithResource:(nullable NSString *)name

                                        type:(const GLenum)type;

// Shader id

@property (nonatomic, readonly) GLuint shader;

@end