/*

 *  Textures.c

 *  VertexPerformance

 *

 *  Created by Kent Miller on Tue Oct 29 2002.

 *  Copyright (c) 2002 Apple Computer. All rights reserved.

 *

 */

#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];

}