szum słońca

grk/cw 6/shaders/shader_sun.frag

@@ -7,6 +7,8 @@ uniform vec3 cameraPos;
 
 uniform bool atmosphereCheck;
 
+uniform float time;
+
 in vec3 vecNormal;
 in vec3 worldPos;
 in vec2 vtc;
@@ -15,6 +17,8 @@ out vec4 outColor;
 
 uniform sampler2D colorTexture;
 
+vec4 noiseColor;
+
 vec3 toneMapping(vec3 color)
 {
 	float exposure = 0.06;
@@ -22,6 +26,76 @@ vec3 toneMapping(vec3 color)
 	return mapped;
 }
 
+float random (in vec2 _st) {
+    return fract(sin(dot(_st.xy,
+                         vec2(-0.550,0.430)))*
+        43758.5453123);
+}
+
+float noise (in vec2 _st) {
+    vec2 i = floor(_st);
+    vec2 f = fract(_st);
+
+    float a = random(i);
+    float b = random(i + vec2(1.0, 0.0));
+    float c = random(i + vec2(0.0, 1.0));
+    float d = random(i + vec2(1.0, 1.0));
+
+    vec2 u = f * f * (3.0 - 2.0 * f);
+
+    return mix(a, b, u.x) +
+            (c - a)* u.y * (1.0 - u.x) +
+            (d - b) * u.x * u.y;
+}
+
+#define NUM_OCTAVES 5
+
+float fbm ( in vec2 _st) {
+    float v = 0.0;
+    float a = 0.5;
+    vec2 shift = vec2(100.0);
+
+    mat2 rot = mat2(cos(0.5), sin(0.5),
+                    -sin(0.5), cos(0.5));
+    for (int i = 0; i < NUM_OCTAVES; ++i) {
+        v += a * noise(_st);
+        _st = rot * _st * 2.0 + shift;
+        a *= 0.9;
+    }
+    return v;
+}
+
+vec4 noiseTexture(float time) {
+    vec2 st = vtc.xy * 9.;
+    vec3 color = vec3(0.0);
+
+    vec2 q = vec2(0.);
+    q.x = fbm(st + 0.0 * time);
+    q.y = fbm(st + vec2(1.0));
+
+    vec2 r = vec2(0.);
+    r.x = fbm(st + 1.0 * q + vec2(1.7, 9.2) + 0.15 * time);
+    r.y = fbm(st + 1.0 * q + vec2(8.3, 2.8) + 0.12 * time);
+
+    float f = fbm(st+r);
+
+    color = mix(vec3(0.667,0.640,0.088),
+                vec3(0.667,0.520,0.134),
+                clamp((f*f)*4.640,0.712,0.056));
+
+    color = mix(color,
+                vec3(0.165,0.006,0.023),
+                clamp(length(q),0.072,0.408));
+
+    color = mix(color,
+                vec3(1.000,0.069,0.060),
+                clamp(length(r.x),0.0,1.0));
+
+    noiseColor = vec4((f*f*f+1.384*f*f+1.044*f)*color,1.);
+
+    return noiseColor;
+}
+
 void main()
 {
 	vec3 normal = normalize(vecNormal);
@@ -36,10 +110,16 @@ void main()
         textureColor = mix(textureColor, atmosphereColor, pow(1 - atmosphereDot, 3));
 	}
 
-	vec3 distance = lightColor / pow(length(lightPos - worldPos), 2.0) * 25;
-    vec3 toneMappedColor = toneMapping(textureColor * distance);
+	vec3 distance = lightColor / pow(length(lightPos - worldPos), 2.0) * 15;
+    
+    vec4 textureNoise = noiseTexture(time);
+    //vec3 mixedTexture = mix(textureColor, textureNoise, textureNoise.r);
+    //vec3 toneMappedColor = toneMapping(mixedTexture * distance);
+    vec3 toneMappedColor = toneMapping(textureNoise.rgb * distance);
     //gamma correction
     toneMappedColor = pow(toneMappedColor, vec3(1.0/2.2));
 
-	outColor = vec4(toneMappedColor * lightColor * 0.2f, 1.0);
+	vec3 textureToned = toneMappedColor * lightColor * 0.2f;
+
+    outColor = vec4(textureToned, 1.0);
 }

grk/cw 6/src/Planet.hpp

@@ -38,7 +38,7 @@ float planetRot = 0.f;
 float planetRough = 0.5f;
 float planetMetal = 0.5f;
 
-const char* const sunTexPaths[] = { "./textures/suns/sol.jpg", "./textures/suns/orange.jpg", "./textures/suns/lava.png", "./textures/suns/star.png", "./textures/suns/sun.jpg" };
+const char* const sunTexPaths[] = { "./textures/suns/lava.png", "./textures/suns/sol.jpg", "./textures/suns/orange.jpg", "./textures/suns/star.png", "./textures/suns/sun.jpg" };
 int sunTexIndex = 20;
 GLuint sunTex;
 
@@ -227,6 +227,7 @@ void drawSun(Core::RenderContext& context, glm::mat4 modelMatrix, GLuint texture
 	glUniform3f(glGetUniformLocation(programSun, "cameraPos"), cameraPos.x, cameraPos.y, cameraPos.z);
 
 	glUniform1i(glGetUniformLocation(programSun, "atmosphereCheck"), atmosphereCheck);
+	glUniform1f(glGetUniformLocation(programSun, "time"), glfwGetTime());
 
 	Core::DrawContext(context);
 	glUseProgram(0);
@@ -264,8 +265,9 @@ void renderScene(GLFWwindow* window) {
 	//rysowanie słońca
 	glm::mat4 sunScale = glm::scale(glm::vec3(sunSize));
 	glm::mat4 sunTranslate = glm::translate(sunPos);
+	glm::mat4 sunRotate = glm::rotate(180.f, glm::vec3(0, 1, 0));
 
-	drawSun(sphereContext, sunTranslate * sunScale, sunTex);
+	drawSun(sphereContext, sunTranslate * sunRotate * sunScale, sunTex);
 
 	//rysowanie skyboxa
 	skyBoxPos = cameraPos;