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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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