lens shader wip

data/materials/Common/GLSL/LensFlare_ps.glsl

@@ -13,9 +13,112 @@ in block
 vulkan_layout( location = 0 )
 out vec4 fragColour;
 
+
+/* This is free and unencumbered software released into the public domain. https://unlicense.org/
+Trying to get some interesting looking lens flares, seems like it worked.
+See https://www.shadertoy.com/view/lsBGDK for a more avanced, generalized solution
+If you find this useful send me an email at peterekepeter at gmail dot com,
+I've seen this shader pop up before in other works, but I'm curious where it ends up.
+If you want to use it, feel free to do so, there is no need to credit but it is appreciated.
+*/
+
+// float noise(float t)
+// {
+// 	return texture(iChannel0,vec2(t,.0)/iChannelResolution[0].xy).x;
+// }
+// float noise(vec2 t)
+// {
+// 	return texture(iChannel0,t/iChannelResolution[0].xy).x;
+// }
+
+vec3 lensflare(vec2 uv, vec2 pos)
+{
+	vec2 main = uv-pos;
+	vec2 uvd = uv*(length(uv));
+
+	float ang = atan(main.x,main.y);
+	float dist = length(main);  dist = pow(dist, 0.1);
+	// float n = noise(vec2(ang*16.0,dist*32.0));
+
+	float f0 = 1.0/(length(uv-pos)*116.0+1.0);  //*16
+
+	// f0 = f0 + f0*(sin(noise(sin(ang*2.+pos.x)*4.0 - cos(ang*3.+pos.y))*16.)*.1 + dist*.1 + .8);
+
+	float f1 = max(0.01-pow(length(uv+1.2*pos),1.9),.0)*7.0;
+
+	float f2  = max(1.0/(1.0+32.0*pow(length(uvd+0.8*pos),2.0)),.0)*00.25;
+	float f22 = max(1.0/(1.0+32.0*pow(length(uvd+0.85*pos),2.0)),.0)*00.23;
+	float f23 = max(1.0/(1.0+32.0*pow(length(uvd+0.9*pos),2.0)),.0)*00.21;
+
+	vec2 uvx = mix(uv,uvd,-0.5);
+
+	float f4  = max(0.01-pow(length(uvx+0.4*pos),2.4),.0)*6.0;
+	float f42 = max(0.01-pow(length(uvx+0.45*pos),2.4),.0)*5.0;
+	float f43 = max(0.01-pow(length(uvx+0.5*pos),2.4),.0)*3.0;
+
+	uvx = mix(uv,uvd,-.4);
+
+	float f5  = max(0.01-pow(length(uvx+0.2*pos),5.5),.0)*2.0;
+	float f52 = max(0.01-pow(length(uvx+0.4*pos),5.5),.0)*2.0;
+	float f53 = max(0.01-pow(length(uvx+0.6*pos),5.5),.0)*2.0;
+
+	uvx = mix(uv,uvd,-0.5);
+
+	float f6  = max(0.01-pow(length(uvx-0.3*pos),1.6),.0)*6.0;
+	float f62 = max(0.01-pow(length(uvx-0.325*pos),1.6),.0)*3.0;
+	float f63 = max(0.01-pow(length(uvx-0.35*pos),1.6),.0)*5.0;
+
+	vec3 c = vec3(.0);
+
+	c.r += f2+f4+f5+f6; c.g+=f22+f42+f52+f62; c.b+=f23+f43+f53+f63;
+	c = c*1.3 - vec3(length(uvd)*.05);
+	c += vec3(f0);
+
+	return c;
+}
+
+vec3 cc(vec3 color, float factor,float factor2)  // color modifier
+{
+	float w = color.x+color.y+color.z;
+	return mix(color,vec3(w)*factor,w*factor2);
+}
+
+/*
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+	vec2 uv = fragCoord.xy / iResolution.xy - 0.5;
+	uv.x *= iResolution.x/iResolution.y; //fix aspect ratio
+	vec3 mouse = vec3(iMouse.xy/iResolution.xy - 0.5,iMouse.z-.5);
+	mouse.x *= iResolution.x/iResolution.y; //fix aspect ratio
+	if (iMouse.z<.5)
+	{
+		mouse.x=sin(iTime)*.5;
+		mouse.y=sin(iTime*.913)*.5;
+	}
+
+	vec3 color = vec3(1.4,1.2,1.0)*lensflare(uv,mouse.xy);
+	color -= noise(fragCoord.xy)*.015;
+	color = cc(color,.5,.1);
+	fragColor = vec4(color,1.0);
+}
+*/
+
 void main()
 {
 	fragColour = texture( vkSampler2D( sceneTexture, texSampler ), inPs.uv0 );
+
+	vec2 uv = inPs.uv0 - vec2(0.5, 0.5);
+	float asp = 1920.0 / 1200.0;  //iResolution.x/iResolution.y;  // todo: fix aspect ratio..
+	uv.x *= asp;
+
+	vec2 mouse = vec2(-0.4, -0.4);  // todo: par sun pos in screen space
+	mouse.x *= asp;
+
+	// fragColour.xyz +=
+	vec3 color = vec3(1.0,1.05,1.1) * lensflare(uv, mouse);
+	color = cc(color, 0.5, 0.1);
+	fragColour.xyz += color; // * color;
+
 	// fragColour.z = texture( vkSampler2D( depthTexture, texSampler ), inPs.uv0 ).x * 1000;
 	// fragColour.xy = inPs.uv0.xy;
 }