Added skybox reflection to water shader

src/render/opengl/OpenGLWater.cpp

@@ -43,6 +43,9 @@ void OpenGLWater::update()
     Color water_color = renderer->getScenery()->getWater()->material->_rgb;
     renderer->getSharedState()->set("waterColor", water_color);
 
+    double water_reflection = renderer->getScenery()->getWater()->reflection;
+    renderer->getSharedState()->set("waterReflection", water_reflection);
+
     renderer->getSharedState()->set("simplexSampler", NoiseFunctionSimplex::getNormalTexture(), true, true);
 }
 

src/render/opengl/shaders/bruneton.frag

@@ -209,3 +209,24 @@ vec4 applyAerialPerspective(vec4 base)
 
     return base * vec4(attenuation, 0.0) + vec4(inscattering, 0.0);
 }
+
+vec4 getSkyColor(vec3 location, vec3 direction)
+{
+    float yoffset = GROUND_OFFSET - waterHeight;
+    vec3 camera = vec3(location.x, max(location.y + yoffset, 0.0), location.z);
+    vec3 x = vec3(0.0, Rg + camera.y * WORLD_SCALING, 0.0);
+    vec3 v = normalize(direction);
+    vec3 s = normalize(sunDirection * SUN_DISTANCE_SCALED - x);
+
+    float r = length(x);
+    float mu = dot(x, v) / r;
+    float t = -r * mu - sqrt(r * r * (mu * mu - 1.0) + Rg * Rg);
+
+    vec4 sunTransmittance = _sunTransmittance(v, s, r, mu, sunRadius);
+    vec3 attenuation;
+    vec3 inscattering = _getInscatterColor(x, t, v, s, r, mu, attenuation);
+
+    vec4 result = vec4(0.01, 0.012, 0.03, 1.0); // night sky
+    result += sunTransmittance + vec4(inscattering, 0.0);
+    return result;
+}

src/render/opengl/shaders/skybox.frag

@@ -1,21 +1,5 @@
 void main(void)
 {
-    float yoffset = GROUND_OFFSET - waterHeight;
-    vec3 camera = vec3(cameraLocation.x, max(cameraLocation.y + yoffset, 0.0), cameraLocation.z);
-    vec3 location = vec3(unprojected.x, max(unprojected.y + yoffset, 0.0), unprojected.z);
-    vec3 x = vec3(0.0, Rg + camera.y * WORLD_SCALING, 0.0);
-    vec3 v = normalize(location - camera);
-    vec3 s = normalize(sunDirection * SUN_DISTANCE_SCALED - x);
-
-    float r = length(x);
-    float mu = dot(x, v) / r;
-    float t = -r * mu - sqrt(r * r * (mu * mu - 1.0) + Rg * Rg);
-
-    vec4 sunTransmittance = _sunTransmittance(v, s, r, mu, sunRadius);
-    vec3 attenuation;
-    vec3 inscattering = _getInscatterColor(x, t, v, s, r, mu, attenuation);
-
-    gl_FragColor = vec4(0.01, 0.012, 0.03, 1.0); // night sky
-    gl_FragColor += sunTransmittance + vec4(inscattering, 0.0);
+    gl_FragColor = getSkyColor(cameraLocation, unprojected - cameraLocation);
     gl_FragColor = applyToneMapping(gl_FragColor);
 }

src/render/opengl/shaders/water.frag

@@ -1,5 +1,6 @@
 uniform vec4 waterColor;
 uniform sampler2D simplexSampler;
+uniform float waterReflection;
 
 vec4 applyLighting(vec3 location, vec3 normal, vec4 color, float shininess)
 {
@@ -24,15 +25,16 @@ vec4 applyLighting(vec3 location, vec3 normal, vec4 color, float shininess)
 
 void main(void)
 {
-    //gl_FragColor = waterColor;
-    //gl_FragColor = texture2D(simplexSampler, unprojected.xz * 0.01);
     vec3 normal = vec3(0.0, 0.0, 0.0);
-    for (float scaling = 1.0; scaling < 50.0; scaling *= 1.5)
+    for (float scaling = 1.0; scaling < 400.0; scaling *= 1.5)
     {
         normal += texture2D(simplexSampler, unprojected.xz * 0.01 * scaling).xyz;
     }
+    normal = normalize(normal);
 
-    gl_FragColor = applyLighting(unprojected, normalize(normal), waterColor, 100.0);
+    gl_FragColor = applyLighting(unprojected, normal, waterColor, 100.0);
+
+    gl_FragColor += getSkyColor(unprojected, reflect(unprojected - cameraLocation, normal)) * waterReflection;
 
     gl_FragColor = applyAerialPerspective(gl_FragColor);