SHINY REFLECTIONS YAY

assets/shaders/phong.fs

@@ -54,11 +54,14 @@ uniform int numPointLights;
 uniform DirLight sunLight;
 uniform Material material;
 uniform sampler2DArray studs;
+uniform samplerCube skybox;
 uniform float transparency;
+uniform float reflectance;
 uniform vec3 texScale;
 
-// Functions
 
+// Functions
+vec3 calculateReflection();
 vec3 calculateDirectionalLight(DirLight light);
 vec3 calculatePointLight(PointLight light);
 mat3 lookAlong(vec3 pos, vec3 forward, vec3 up);
@@ -68,6 +71,7 @@ mat3 lookAlong(vec3 pos, vec3 forward, vec3 up);
 void main() {
     vec3 result = vec3(0.0);
 
+    result += calculateReflection();
     result += calculateDirectionalLight(sunLight);
     
     for (int i = 0; i < numPointLights; i++) {
@@ -95,6 +99,25 @@ mat3 lookAlong(vec3 pos, vec3 forward, vec3 up) {
 	return mat3(s, u, f);
 }
 
+
+vec3 sampleSkybox()
+{
+    vec3 norm = normalize(vNormal);
+    vec3 viewDir = normalize(viewPos - vPos);
+    vec3 reflectDir = reflect(-viewDir, norm);
+
+    return textureLod(skybox,reflectDir, 5.0 * (1.0-material.shininess)).rgb;
+}
+
+vec3 calculateReflection() {
+    vec3 norm = normalize(vNormal);
+    vec3 viewDir = normalize(viewPos - vPos);
+    vec3 reflectDir = reflect(viewDir, norm);
+    float fresnel = (pow(1.0-max(dot(viewDir, norm), 0.0), 5.0));
+    vec3 result = sampleSkybox() * mix(fresnel * material.specular, vec3(1.0), reflectance);
+    return result;
+}
+
 vec3 calculateDirectionalLight(DirLight light) {
     // Calculate diffuse
     vec3 norm = normalize(vNormal);
@@ -105,10 +128,13 @@ vec3 calculateDirectionalLight(DirLight light) {
     vec3 viewDir = normalize(viewPos - vPos);
     vec3 reflectDir = reflect(-lightDir, norm);
     float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    // float fresnel = (pow(1.0-max(dot(viewDir, norm), 0.0), 5.0));
     
-    vec3 ambient = light.ambient * material.diffuse;
-    vec3 diffuse = light.diffuse * diff * material.diffuse;
+    
+    vec3 ambient = light.ambient * (material.diffuse * (1.0-reflectance));
+    vec3 diffuse = light.diffuse * diff * (material.diffuse * (1.0-reflectance));
     vec3 specular = light.specular * spec * material.specular;
+    // specular += sampleSkybox() * fresnel * material.specular;
     
     return (ambient + diffuse + specular);
 }

core/src/objects/part/basepart.h

@@ -83,6 +83,7 @@ public:
     DEF_PROP_CATEGORY(APPEARANCE)
     DEF_PROP Color3 color;
     DEF_PROP float transparency = 0.f;
+    DEF_PROP float reflectance = 0.f;
     
     DEF_PROP_CATEGORY(BEHAVIOR)
     DEF_PROP_(on_update=onUpdated) bool anchored = false;

core/src/rendering/renderer.cpp

@@ -137,6 +137,7 @@ static void renderPart(std::shared_ptr<BasePart> part) {
     shader->set("normalMatrix", normalMatrix);
     shader->set("texScale", size);
     shader->set("transparency", part->transparency);
+    shader->set("reflectance", part->reflectance);
 
     shader->set("surfaces[" + std::to_string(NormalId::Right) + "]", (int)part->rightSurface);
     shader->set("surfaces[" + std::to_string(NormalId::Top) + "]", (int)part->topSurface);
@@ -183,11 +184,14 @@ void renderParts() {
     shader->set("numPointLights", 0);
     studsTexture->activate(0);
     shader->set("studs", 0);
+    skyboxTexture->activate(1);
+    shader->set("skybox", 1);
 
     // Pre-calculate the normal matrix for the shader
 
     // Pass in the camera position
     shader->set("viewPos", camera.cameraPos);
+    
 
     // Sort by nearest
     std::map<float, std::shared_ptr<BasePart>> sorted;

core/src/rendering/skybox.cpp

@@ -22,6 +22,7 @@ Skybox::Skybox(std::array<std::string, 6> faces, unsigned int format) {
 
         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, format, width, height, 0, format,
                     GL_UNSIGNED_BYTE, data);
+        glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
         stbi_image_free(data);
     }
 
@@ -31,7 +32,7 @@ Skybox::Skybox(std::array<std::string, 6> faces, unsigned int format) {
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 
     // Interpolation
-    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 }
 
@@ -41,5 +42,5 @@ Skybox::~Skybox() {
 
 void Skybox::activate(unsigned int textureIdx) {
     glActiveTexture(GL_TEXTURE0 + textureIdx);
-    glBindTexture(GL_TEXTURE_2D, this->ID);
+    glBindTexture(GL_TEXTURE_CUBE_MAP, this->ID);
 }