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//
// NSColor+OpenGLExtensions.m
// TheBigRedButton
//
// Created by Uli Kusterer on 02.09.07.
// Copyright 2007 M. Uli Kusterer.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//

#import "NSColor+OpenGLExtensions.h"
#import <OpenGL/gl.h>

static GLuint texName = 0;


GLuint UKGetTextureFromImage( NSImage* theImg )
{
NSBitmapImageRep* bitmap = [NSBitmapImageRep alloc];
    int samplesPerPixel = 0;
    NSSize imgSize = [theImg size];
 
    [theImg lockFocus];
    [bitmap initWithFocusedViewRect:
                    NSMakeRect(0.0, 0.0, imgSize.width, imgSize.height)];
    [theImg unlockFocus];
 
    // Set proper unpacking row length for bitmap.
    glPixelStorei(GL_UNPACK_ROW_LENGTH, [bitmap pixelsWide]);
 
    // Set byte aligned unpacking (needed for 3 byte per pixel bitmaps).
    glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
 
    // Generate a new texture name if one was not provided.
texName = 0;
glGenTextures( 1, &texName );

    glBindTexture( GL_TEXTURE_RECTANGLE_EXT, texName );
 
    // Non-mipmap filtering (redundant for texture_rectangle).
    glTexParameteri( GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
    glTexParameteri( GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_WRAP_S, GL_REPEAT );
    glTexParameteri( GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_WRAP_T, GL_REPEAT );
    samplesPerPixel = [bitmap samplesPerPixel];

    // Nonplanar, RGB 24 bit bitmap, or RGBA 32 bit bitmap.
    if(![bitmap isPlanar] &&
        (samplesPerPixel == 3 || samplesPerPixel == 4))
    {
        glTexImage2D( GL_TEXTURE_RECTANGLE_EXT, 0,
            samplesPerPixel == 4 ? GL_RGBA8 : GL_RGB8,
            [bitmap pixelsWide],
            [bitmap pixelsHigh],
            0,
            samplesPerPixel == 4 ? GL_RGBA : GL_RGB,
            GL_UNSIGNED_BYTE,
            [bitmap bitmapData]);
}
    else
    {
        NSLog(@"Wrong bitmap format.");
    }
 
    // Clean up.
    [bitmap release];

return texName;
}


@implementation NSColor (UKOpenGLExtensions)

-(void) setForGLContext
{
NSString* myColorSpace = [self colorSpaceName];
if( myColorSpace == NSPatternColorSpace )
{
NSImage* pattern = [self patternImage];
GLuint pat = UKGetTextureFromImage( pattern );
glBindTexture( GL_TEXTURE_RECTANGLE_EXT, pat );
}
else
{
NSColor* theColor = self;

if( myColorSpace != NSDeviceRGBColorSpace && myColorSpace != NSCalibratedRGBColorSpace )
theColor = [self colorUsingColorSpaceName: NSCalibratedRGBColorSpace];

GLfloat red = 1.0, green = 1.0, blue = 1.0, alpha = 1.0;
red = [theColor redComponent];
green = [theColor greenComponent];
blue = [theColor blueComponent];
alpha = [theColor alphaComponent];

glColor4f( red, green, blue, alpha );
}
}

-(void) setForClearingGLContext
{
GLfloat red = 1.0, green = 1.0, blue = 1.0, alpha = 1.0;
NSString* myColorSpace = [self colorSpaceName];
NSColor* theColor = self;

if( myColorSpace != NSDeviceRGBColorSpace && myColorSpace != NSCalibratedRGBColorSpace )
theColor = [self colorUsingColorSpaceName: NSCalibratedRGBColorSpace];

red = [theColor redComponent];
green = [theColor greenComponent];
blue = [theColor blueComponent];
alpha = [theColor alphaComponent];

glClearColor( red, green, blue, 1 -alpha );
}


@end
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