FuniCode 编程论坛

unsigned char RD(int i,int j){

	return 0;

}

unsigned char GR(int i,int j){

        double x = -(i - 512), y = j - 512, a = 0, b = 0;

	int k;

	x = x/255;

	y = y/255;

	for(k = 0;k <= 256;k++){

		if(x*x+y*y > 4)break;

		a = x;b = y;

		x = (a*a-b*b) + 2.5;

		y = (a*b+b*a);

	}

	if(k >=256)return 0;

	k*=16;

	if(k >= 256)k = 255;

	return k;

}

unsigned char BL(int i,int j){

	return 0;

}

float RGB(float x, float y, float e)

{

    return ( x * tan(x/y) ) * ( y * tan( x/y + iGlobalTime/2.0 * e ) ) / (iMouse.x*10.0+500.0);

}



void mainImage( out vec4 fragColor, in vec2 fragCoord )

{

    vec2 coord;

    coord = (fragCoord - iResolution.xy/2.0)*5.0;

   

	fragColor = vec4(

        float(int(RGB(coord.x, coord.y, 0.33)) %255) / 255.0,

        float(int(RGB(coord.x, coord.y, 0.66)) %255) / 255.0,

        float(int(RGB(coord.x, coord.y, 0.99)) %255) / 255.0,

        1.0);



}