Add sun

README.md

@@ -6,3 +6,4 @@ Shader projects for [SHADERed](https://github.com/dfranx/SHADERed).
 
 ![neon_pulse](/render/neon_pulse.gif)
 ![flame](/render/flame.gif)
+![sun](/render/sun.gif)

shaders/sun_SunPS.glsl

@@ -0,0 +1,94 @@
+#version 330
+
+uniform vec2 uResolution;
+uniform float uTime;
+
+out vec4 outColor;
+
+// https://iquilezles.org/articles/palettes/
+// http://dev.thi.ng/gradients/
+vec3 palette(float t) {
+    vec3 a = vec3(0.500, 0.500, 0.000);
+    vec3 b = vec3(0.500, 0.500, 0.000);
+    vec3 c = vec3(0.100, 0.500, 0.000);
+    vec3 d = vec3(0.000, 0.000, 0.000);
+
+    return a + b*cos(6.28318*(c*t+d));
+}
+
+float rand(vec2 co){
+    return fract(sin(dot(co, vec2(12.9898, 78.233))) * 43758.5453);
+}
+
+void main()
+{
+    vec2 uv = (gl_FragCoord.xy * 2.0 - uResolution.xy) / uResolution.y;
+    uv *= 0.6; // final scale
+    vec2 uv0 = uv;
+    vec3 finalColor = vec3(0.0);
+
+    // sun + sky base
+    float dist = length(uv);
+    float flareMask = 1.0 - smoothstep(0.4, 0.49, dist);
+    float hotspotMask = 1.0 - smoothstep(0.4, 0.43, dist);
+    float noiseMask = 1.0 - smoothstep(0, 0.43, dist);
+    vec3 col = palette(dist);
+
+    dist = 0.6 / dist;
+    dist = pow(dist, 1.4);
+
+    finalColor += col * dist;
+
+    // flares
+    vec3 flareColor = vec3(0.0);
+    for (float i = 0.0; i < 3.0; i++)
+    {
+        uv = fract(uv * 1.6) - 0.5;
+        
+        float d = length(uv);
+        vec3 col = palette(d + sin(uTime * 0.1));
+        d = sin(d * 12.0 + uTime * 0.5) / 12.0;
+        d = abs(d);
+        
+        d = 0.04 / d;
+        d = pow(d, 1.4);
+        
+        flareColor += col * d * flareMask;
+    }
+    finalColor += flareColor;
+
+    // hotspots
+    /*
+    vec3 hotspotColor = vec3(1.0);
+    float hotspotMask2 = 1.0;
+    vec2 hotspotUv = uv0 + 0.01 * vec2(uTime, -uTime * 0.2);
+    
+    for (float i = 0.0; i < 2.0; i++)
+    {
+        hotspotUv = fract(hotspotUv * 1.5) - 0.5;
+        
+        float d = length(hotspotUv);
+        d = sin(d * 4.0) / 8.0;
+        d = abs(d);
+        
+        d = 0.1 / d;
+        
+        hotspotMask2 *= d;
+    }
+    finalColor -= 0.03 * hotspotColor * hotspotMask * hotspotMask2;
+    */
+
+    // surface noise + brighter in the middle
+    float noise = rand(uv * sin(uTime));
+    finalColor += 1.5 * noise * noiseMask;
+    
+    // vignette
+    vec2 edge = gl_FragCoord.xy / uResolution.xy;
+    edge *= 1.0 - edge.yx;
+    float vig = edge.x * edge.y * 20.0;
+    vig = pow(vig, 0.1);
+    finalColor *= vig;
+    
+    outColor = vec4(finalColor, 1.0);
+    //outColor = vec4(hotspotColor * hotspotMask * hotspotMask2, 1.0);
+}

shaders/sun_SunVS.glsl

@@ -0,0 +1,7 @@
+#version 330
+
+layout (location = 0) in vec2 pos;
+
+void main() {
+    gl_Position = vec4(pos, 0.0f, 1);
+}

sun.sprj

@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<project version="2">
+	<pipeline>
+		<pass name="Sun" type="shader" active="true" patchverts="1">
+			<shader type="vs" path="shaders/sun_SunVS.glsl" entry="main" />
+			<shader type="ps" path="shaders/sun_SunPS.glsl" entry="main" />
+			<inputlayout>
+				<item value="Position" semantic="POSITION" />
+			</inputlayout>
+			<rendertexture />
+			<items>
+				<item name="Quad" type="geometry">
+					<type>ScreenQuadNDC</type>
+					<width>1</width>
+					<height>1</height>
+					<depth>1</depth>
+					<topology>TriangleList</topology>
+				</item>
+			</items>
+			<itemvalues />
+			<variables>
+				<variable type="float2" name="uResolution" system="ViewportSize" />
+				<variable type="float" name="uTime" system="Time" />
+			</variables>
+			<macros />
+		</pass>
+	</pipeline>
+	<objects />
+	<cameras />
+	<settings>
+		<entry type="property" name="Sun" item="pipe" />
+		<entry type="file" name="Sun" shader="vs" />
+		<entry type="file" name="Sun" shader="ps" />
+		<entry type="camera" fp="false">
+			<distance>4</distance>
+			<pitch>25</pitch>
+			<yaw>319</yaw>
+			<roll>360</roll>
+		</entry>
+		<entry type="clearcolor" r="0" g="0" b="0" a="0" />
+		<entry type="usealpha" val="false" />
+	</settings>
+	<plugindata />
+</project>