Elysian Shadows

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#include <GL>
#include <GL>
#include <SDL>

#define window_width  700
#define window_height 700

//keydown booleans
bool key[321];


//process pending events
bool events()
{
	SDL_Event event;
	if( SDL_PollEvent(&event) )
	{
		switch( event.type )
		{
			case SDL_KEYDOWN : key[ event.key.keysym.sym ]=true ;   break;
			case SDL_KEYUP   : key[ event.key.keysym.sym ]=false;   break;
			case SDL_QUIT    : return false; break;
		}
	}
	return true;
}


void recursingRender(float x, float y, int depth, float radius, float color)
{
	if(depth > 0)
	{
		depth--;
		recursingRender(x+radius, y+radius, depth, radius/2, color/1.6);
		recursingRender(x+radius, y-radius, depth, radius/2, color/1.6);
		recursingRender(x-radius, y+radius, depth, radius/2, color/1.6);
		recursingRender(x-radius, y-radius, depth, radius/2, color/1.6);
	}
	
	//draw entire swastika
	for(int i=0; i<4; i++)
	{
		//for crazy color shimmer +((float)random()/(float)0x7fffffff)*color
		glColor3f(color,color,color);
		glLineWidth(1);
		
		glBegin(GL_LINE_STRIP);
			glVertex2f(x, y);
			glVertex2f(x, y+radius);
			glVertex2f(x, y+radius);
			glVertex2f(x+radius, y+radius);
		glEnd();
	
		glRotatef(90, 0, 0, 1);
	}
}


void main_loop_function()
{
	while( events() )
	{
		glClearColor(0.0, 0.0, 0.0, 0.0);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		glLoadIdentity();
		glTranslatef(0,0, -5); //for when angle isn't 45
		//glTranslatef(0,0, -7); // for when it is 45

		recursingRender(0,0,7,1,1);
		
		SDL_GL_SwapBuffers();
		
		//check keypresses
		if( key[SDLK_RETURN ] ){ break; }	
	}
}


//initialze OpenGL perspective matrix
void GL_Setup(int width, int height)
{
	glViewport( 0, 0, width, height );
	glMatrixMode( GL_PROJECTION );
	//glEnable( GL_DEPTH_TEST );
	//^^^ enabling this takes away transparency n blending
	gluPerspective( 45, (float)width/height, 0.1, 100 );
	glMatrixMode( GL_MODELVIEW );
	glEnable(GL_LINE_SMOOTH);
}


int main()
{
	//initialize SDL with best video mode
	SDL_Init(SDL_INIT_VIDEO);
	const SDL_VideoInfo* info = SDL_GetVideoInfo();	
	int vidFlags = SDL_OPENGL | SDL_GL_DOUBLEBUFFER;
	
	if(info->hw_available)
	{
		vidFlags |= SDL_HWSURFACE;
	} else {
		vidFlags |= SDL_SWSURFACE;
	}
	
	int bpp = info->vfmt->BitsPerPixel;
	SDL_SetVideoMode(window_width, window_height, bpp, vidFlags);
	GL_Setup(window_width, window_height);
	main_loop_function();
}