mandelsend.cg

struct output{
	float4 color : COLOR;
};

output main(float2 position : POSITION, float2 texCoord : TEXCOORD, uniform float sze, uniform sampler2D lastTex, uniform sampler2D audioTex, uniform float var1, uniform float var2)
{
//	output OUT;
//	if(tex2D(audioTex, texCoord).b > 0.5){
//		OUT.color = float4(texCoord.x, texCoord.y, 1, 1);
//	}
//	else{
//		float2 p = float2(2*texCoord.x - 1, 1 - 2*texCoord.y);
//		float2 c = float2(p);
//		for(int i = 0; i < 10; i++)
//			p = float2(p.x * p.x - p.y * p.y + c.x, 2 * p.x * p.y + c.y);
//		p = float2((p.x + 1)/2, (1 - p.y)/2);
//		if(tex2D(audioTex, p).b > 0.5)
//			OUT.color = float4(p.x, p.y, 1, 1);
//		else OUT.color = tex2D(lastTex, texCoord) - 0.002;
//	}
//	return OUT;

	output OUT;
	float2 tc = float2(texCoord);
	float2 p = float2(2*tc.x - 1, 1 - 2*tc.y);
	float2 c = float2(p);
	int i;
	int iter = 10;
	for(i = 0; i < iter; i++){
		if(tex2D(audioTex, tc).b > 0.5){
			OUT.color = float4(texCoord.x, texCoord.y, 1, 1);
			break;
		}
		else{
			p = var1*float2(p.x * p.x - p.y * p.y + c.x, 2 * p.x * p.y + c.y);
			tc = float2((p.x + 1)/2, (1 - p.y)/2);
		}
	}
	if(i == iter)
		OUT.color = tex2D(lastTex, texCoord) - 0.02;
	return OUT;
}