ISFTargetBuffer.h

#import <Cocoa/Cocoa.h>
#import <VVBasics/VVBasics.h>
#import <VVBufferPool/VVBufferPool.h>
#import <DDMathParser/DDExpression.h>




/*
        this class represents a target buffer for an ISF shader- it stores the VVBuffer (the GL 
        resource) as well as the expressions determining the width/height (the raw string, the 
        evaluated expression- capable of being executed with substitutions for variables, and the 
        evaluated value), and the cached uniform locations for this target buffer's attributes in 
        the compiled GL program (so you don't have to look up the uniform location every frame).
*/




@interface ISFTargetBuffer : NSObject   {
    NSString        *name;  //  the name of this buffer
    VVBuffer        *buffer;    //  nil, or the VVBuffer instance for this
    
    double          targetWidth;
    NSString        *targetWidthString;
    DDExpression    *targetWidthExpression;
    double          targetHeight;
    NSString        *targetHeightString;
    DDExpression    *targetHeightExpression;
    
    BOOL            floatFlag;  //  NO by default. if YES, makes float textures!
    
    int             uniformLocation[4]; //  the location of this attribute in the compiled GLSL program. cached here because lookup times are costly when performed every frame.  there are 4 because images require four uniforms (one of the texture name, one for the size, one for the img rect, and one for the flippedness)
}

+ (id) create;

- (void) setTargetSize:(NSSize)n;
- (void) setTargetSize:(NSSize)n createNewBuffer:(BOOL)c;
- (void) setTargetSize:(NSSize)n resizeExistingBuffer:(BOOL)r;
- (void) setTargetSize:(NSSize)n resizeExistingBuffer:(BOOL)r createNewBuffer:(BOOL)c;
- (void) setTargetWidthString:(NSString *)n;
- (void) setTargetHeightString:(NSString *)n;
- (void) setFloatFlag:(BOOL)n;
- (BOOL) floatFlag;
- (void) clearBuffer;

//  returns a YES if there's a target width string
- (BOOL) targetSizeNeedsEval;
- (void) evalTargetSizeWithSubstitutionsDict:(NSDictionary *)d;
- (void) evalTargetSizeWithSubstitutionsDict:(NSDictionary *)d resizeExistingBuffer:(BOOL)r;
- (void) evalTargetSizeWithSubstitutionsDict:(NSDictionary *)d resizeExistingBuffer:(BOOL)r createNewBuffer:(BOOL)c;

@property (retain,readwrite) NSString *name;
@property (retain,readwrite) VVBuffer *buffer;

- (NSSize) targetSize;

- (void) setUniformLocation:(int)n forIndex:(int)i;
- (int) uniformLocationForIndex:(int)i;
- (void) clearUniformLocations;

@end