/*

File: GLTexture.h
Abstract: Creates OpenGL 2D textures from images or text.

Version: 1.7

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*/

#import <UIKit/UIKit.h>
#import <OpenGLES/ES1/gl.h>

//CONSTANTS:

typedef enum {
	kGLTexturePixelFormat_Automatic = 0,
	kGLTexturePixelFormat_RGBA8888,
	kGLTexturePixelFormat_RGB565,
	kGLTexturePixelFormat_A8,
} GLTexturePixelFormat;

//CLASS INTERFACES:

/*
This class allows to easily create OpenGL 2D textures from images, text or raw data.
The created GLTexture object will always have power-of-two dimensions.
Depending on how you create the GLTexture object, the actual image area of the texture might be smaller than the texture dimensions i.e. "contentSize" != (pixelsWide, pixelsHigh) and (maxS, maxT) != (1.0, 1.0).
Be aware that the content of the generated textures will be upside-down!
*/
@interface GLTexture : NSObject
{
@private
	GLuint						_name;
	CGSize						_size;
	NSUInteger					_width,
								_height;
	GLTexturePixelFormat		_format;
	GLfloat						_maxS,
								_maxT;
}
- (id) initWithData:(const void*)data pixelFormat:(GLTexturePixelFormat)pixelFormat pixelsWide:(NSUInteger)width pixelsHigh:(NSUInteger)height contentSize:(CGSize)size;

@property(readonly) GLTexturePixelFormat pixelFormat;
@property(readonly) NSUInteger pixelsWide;
@property(readonly) NSUInteger pixelsHigh;

@property(readonly) GLuint name;

@property(readonly, nonatomic) CGSize contentSize;
@property(readonly) GLfloat maxS;
@property(readonly) GLfloat maxT;

@property(readonly) float width;
@property(readonly) float height;
@end

/*
Drawing extensions to make it easy to draw basic quads using a GLTexture object.
These functions require GL_TEXTURE_2D and both GL_VERTEX_ARRAY and GL_TEXTURE_COORD_ARRAY client states to be enabled.
*/
@interface GLTexture (Drawing)
- (void) drawAtPoint:(CGPoint)point;
- (void) drawAtPoint:(CGPoint)point withRotation:(CGFloat)rotation withScale:(CGFloat)scale;
- (void) drawInRect:(CGRect)dest withClip:(CGRect)src withRotation:(CGFloat)rotation;
- (void) drawInRect:(CGRect)rect;
- (void) drawInVertices:(GLfloat*) vertices;
@end

/*
Extensions to make it easy to create a GLTexture object from an image file.
Note that RGBA type textures will have their alpha premultiplied - use the blending mode (GL_ONE, GL_ONE_MINUS_SRC_ALPHA).
*/
@interface GLTexture (Image)
- (id) initWithImage:(UIImage *)uiImage;
@end

