/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "CCDrawingPrimitives.h"

#define _USE_MATH_DEFINES
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <GLES/gl.h>

void ccDrawPoint(CGPoint point)
{
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
	
	glVertexPointer(2, GL_FLOAT, 0, &point);	
	glDrawArrays(GL_POINTS, 0, 1);

	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
}

void ccDrawPoints(CGPoint *points, unsigned int numberOfPoints)
{
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);

	glVertexPointer(2, GL_FLOAT, 0, points);
	glDrawArrays(GL_POINTS, 0, numberOfPoints);
	
	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
}


void ccDrawLine(CGPoint origin, CGPoint destination)
{
	CGPoint vertices[2];
	
	vertices[0] = origin;
	vertices[1] = destination;

	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
	
	glVertexPointer(2, GL_FLOAT, 0, vertices);	
	glDrawArrays(GL_LINES, 0, 2);
	
	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
}


void ccDrawPoly(CGPoint *poli, int points, bool closePolygon)
{
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
	
	glVertexPointer(2, GL_FLOAT, 0, poli);
	if (closePolygon)
	{
		glDrawArrays(GL_LINE_LOOP, 0, points);
	}
	else 
	{
		glDrawArrays(GL_LINE_STRIP, 0, points);
	}
	
	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
}

void ccDrawCircle(CGPoint center, float r, float a, int segs, bool drawLineToCenter)
{
	int additionalSegment = 1;
	if (drawLineToCenter)
	{
		++additionalSegment;
	}

	const float coef = 2.0f * (float)M_PI/segs;
	
	float *vertices = (float *)malloc( sizeof(float)*2*(segs+2));
	if( ! vertices )
	{
		return;
	}
	
	memset( vertices,0, sizeof(float)*2*(segs+2));
	
	for(int i=0;i<=segs;i++)
	{
		float rads = i*coef;
		float j = r * cosf(rads + a) + center.x;
		float k = r * sinf(rads + a) + center.y;
		
		vertices[i*2] = j;
		vertices[i*2+1] =k;
	}
	vertices[(segs+1)*2] = center.x;
	vertices[(segs+1)*2+1] = center.y;
	
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
	
	glVertexPointer(2, GL_FLOAT, 0, vertices);	
	glDrawArrays(GL_LINE_STRIP, 0, segs+additionalSegment);
	
	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
	
	free(vertices);
}

void ccDrawQuadBezier(CGPoint origin, CGPoint control, CGPoint destination, int segments)
{
	CGPoint *vertices = new CGPoint[segments + 1];
	
	float t = 0.0f;
	for(int i = 0; i < segments; i++)
	{
		float x = powf(1 - t, 2) * origin.x + 2.0f * (1 - t) * t * control.x + t * t * destination.x;
		float y = powf(1 - t, 2) * origin.y + 2.0f * (1 - t) * t * control.y + t * t * destination.y;
		vertices[i] = CGPointMake(x, y);
		t += 1.0f / segments;
	}
	vertices[segments] = destination;
	
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
	
	glVertexPointer(2, GL_FLOAT, 0, vertices);	
	glDrawArrays(GL_LINE_STRIP, 0, segments + 1);
	delete[] vertices;
	
	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
}

void ccDrawCubicBezier(CGPoint origin, CGPoint control1, CGPoint control2, CGPoint destination, int segments)
{
	CGPoint *vertices = new CGPoint[segments + 1];
	
	float t = 0;
	for(int i = 0; i < segments; ++i)
	{
		float x = powf(1 - t, 3) * origin.x + 3.0f * powf(1 - t, 2) * t * control1.x + 3.0f * (1 - t) * t * t * control2.x + t * t * t * destination.x;
		float y = powf(1 - t, 3) * origin.y + 3.0f * powf(1 - t, 2) * t * control1.y + 3.0f * (1 - t) * t * t * control2.y + t * t * t * destination.y;
		vertices[i] = CGPointMake(x, y);
		t += 1.0f / segments;
	}
	vertices[segments] = destination;
	
	// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
	// Needed states: GL_VERTEX_ARRAY, 
	// Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY, GL_COLOR_ARRAY	
	glDisable(GL_TEXTURE_2D);
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);
	
	glVertexPointer(2, GL_FLOAT, 0, vertices);	
	glDrawArrays(GL_LINE_STRIP, 0, segments + 1);
	delete[] vertices;
	
	// restore default state
	glEnableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnable(GL_TEXTURE_2D);	
}