NSOpenGLContext+DrawingExtensions.m

//
//  NSOpenGLContext+DrawingExtensions.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 "NSOpenGLContext+DrawingExtensions.h"
#import <OpenGL/gl.h>


@implementation NSOpenGLContext (UKDrawingExtensions)

-(void)		fillQuad: (UK3DQuad)quad
{
	glBegin(GL_QUADS);	// 01 11 10 00
		glTexCoord2f(0.0f, 0.0f);
		glVertex3f( quad.a.x, quad.a.y, quad.a.z );
		glTexCoord2f( quad.b.x -quad.a.x, 0.0f);
		glVertex3f( quad.b.x, quad.b.y, quad.b.z );	
		glTexCoord2f( quad.b.x -quad.a.x, quad.a.y -quad.c.y);
		glVertex3f( quad.c.x, quad.c.y, quad.c.z );
		glTexCoord2f(0.0f, quad.a.y -quad.c.y);
		glVertex3f( quad.d.x, quad.d.y, quad.d.z );
	glEnd();
}


-(void)		fillQuadReflection: (UK3DQuad)quad
{
	GLfloat		height = quad.a.y -quad.c.y,
				halfHeight = height / 2;
	
	glBegin(GL_QUADS);	// 01 11 10 00
		glColor4f( 1.0, 1.0, 1.0, 0.3 );
		glTexCoord2f(0.0f, height);
		glVertex3f( quad.a.x, quad.a.y -height, quad.a.z );
		glTexCoord2f( quad.b.x -quad.a.x, height);
		glVertex3f( quad.b.x, quad.b.y -height, quad.b.z );	
		glTexCoord2f( quad.b.x -quad.a.x, 0.0f);
		glColor4f( 1.0, 1.0, 1.0, 0.0 );
		glVertex3f( quad.c.x, quad.c.y -halfHeight, quad.c.z );
		glTexCoord2f(0.0f, 0.0f);
		glVertex3f( quad.d.x, quad.d.y -halfHeight, quad.d.z );
		glColor4f( 1.0, 1.0, 1.0, 1.0 );
	glEnd();
}


-(void)		fillQuadShadow: (UK3DQuad)quad
{
	GLfloat		height = quad.a.y -quad.c.y,
				halfHeight = height / 8,
				quarterHeight = halfHeight / 2;
	
	glBegin(GL_QUADS);	// 01 11 10 00
		glColor4f( 0, 0, 0, 0.05 );
		glTexCoord2f(0.0f, 0.0f);
		glVertex3f( quad.a.x, quad.a.y -height +(quarterHeight *3), quad.a.z );
		glTexCoord2f( quad.b.x -quad.a.x, 0.0f);
		glVertex3f( quad.b.x, quad.b.y -height +(quarterHeight *3), quad.b.z );	
		glColor4f( 0, 0, 0, 0.1 );
		glTexCoord2f( quad.b.x -quad.a.x, height);
		glVertex3f( quad.c.x, quad.c.y, quad.c.z );
		glTexCoord2f(0.0f, height);
		glVertex3f( quad.d.x, quad.d.y, quad.d.z );
		glColor4f( 1.0, 1.0, 1.0, 1.0 );
	glEnd();
}


@end