/*

 * 

    Copyright:  Copyright © 2003 Apple Computer, Inc., All Rights Reserved

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

            ("Apple") in consideration of your agreement to the following terms, and your

            use, installation, modification or redistribution of this Apple software

            constitutes acceptance of these terms.  If you do not agree with these terms,

            please do not use, install, modify or redistribute this Apple software.

            In consideration of your agreement to abide by the following terms, and subject

            to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs

            copyrights in this original Apple software (the "Apple Software"), to use,

            reproduce, modify and redistribute the Apple Software, with or without

            modifications, in source and/or binary forms; provided that if you redistribute

            the Apple Software in its entirety and without modifications, you must retain

            this notice and the following text and disclaimers in all such redistributions of

            the Apple Software.  Neither the name, trademarks, service marks or logos of

            Apple Computer, Inc. may be used to endorse or promote products derived from the

            Apple Software without specific prior written permission from Apple.  Except as

            expressly stated in this notice, no other rights or licenses, express or implied,

            are granted by Apple herein, including but not limited to any patent rights that

            may be infringed by your derivative works or by other works in which the Apple

            Software may be incorporated.

            The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

            WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

            WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

            PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

            COMBINATION WITH YOUR PRODUCTS.

            IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

            CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

            GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

            ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

            OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

            (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

            ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 */

#include "Textures.h"

static unsigned int truncPowerOf2(unsigned int x)

{

    int i = 0;

    while (x = x>>1) i++;

    return (1<<i);

}

void TextureFromNSImage(NSImage *image, GLuint *texID, GLuint * width,GLuint *height)

{

    NSBitmapImageRep    *sourceImageRep;

    GLenum      imageFormat = GL_RGBA;

    GLubyte     *sourcePic;

    long        sourceRowBytes, pixelSize;

    NSSize      imageSize;

    sourceImageRep = [[NSBitmapImageRep alloc]initWithData: [image TIFFRepresentation]];

    if ([sourceImageRep hasAlpha] == YES)

    {

        if ([sourceImageRep bitsPerPixel] != 32) return;

        imageFormat = GL_RGBA;

        pixelSize = 4;

    }

    else

    {

        if ([sourceImageRep bitsPerPixel] != 24) return;

        imageFormat = GL_RGB;

        pixelSize = 3;

    }

    sourceRowBytes = [sourceImageRep bytesPerRow];

    sourcePic = (GLubyte*) [sourceImageRep bitmapData];

    imageSize = [sourceImageRep size];

    //Do the OpenGL flip

    {

        GLubyte *pic = malloc( imageSize.height * sourceRowBytes );

        GLuint  i;

        for (i = 0; i < imageSize.height; i++)

        {

            memcpy ( pic + (i * sourceRowBytes),

                    sourcePic + ((((int)imageSize.height - i) - 1) * sourceRowBytes),

                    sourceRowBytes);

        }

        sourcePic = pic;

    }

    glPixelStorei(GL_UNPACK_ROW_LENGTH, sourceRowBytes/pixelSize);

    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    if (*texID == 0)

        glGenTextures(1, texID);

    glBindTexture(GL_TEXTURE_2D,*texID);

    *width = truncPowerOf2(imageSize.width);

    *height = truncPowerOf2(imageSize.height);

    glTexImage2D(GL_TEXTURE_2D, 0, imageFormat, *width, *height, 0, imageFormat, GL_UNSIGNED_BYTE, sourcePic);

    [sourceImageRep release];

}

void StringToTexture( char * string, char * fontName, 

            int fontSize, GLuint *texID, GLuint texWidth, 

            GLuint texHeight, NSColor *color)

{

    NSImage     *textImage = [[NSImage alloc] initWithSize:NSMakeSize((float)texWidth, (float) texHeight)];

    NSString        *s = [NSString stringWithCString: string];

    NSMutableDictionary *textAttributes = [[NSMutableDictionary alloc]init];

    GLuint      w,h;

    [textAttributes setObject: [NSFont fontWithName: [NSString stringWithCString: fontName] size: fontSize] forKey: NSFontAttributeName];

    if (color == 0)

        [textAttributes setObject: [NSColor whiteColor] forKey: NSForegroundColorAttributeName];

    else

        [textAttributes setObject: color forKey: NSForegroundColorAttributeName];

    [textImage lockFocus];

    [s drawInRect: NSMakeRect(0,0,texWidth,texHeight) withAttributes:textAttributes];

    if (*texID == 0)

        glGenTextures(1, texID);

    glBindTexture(GL_TEXTURE_2D, *texID);

    TextureFromNSImage(textImage, texID, &w, &h);

    [textImage unlockFocus];

}