1 files changed, 128 insertions, 0 deletions
diff --git a/engine-ocean/Resources/Shaders/phong.frag b/engine-ocean/Resources/Shaders/phong.frag
new file mode 100644
index 0000000..a83fc54
--- /dev/null
+++ b/engine-ocean/Resources/Shaders/phong.frag
@@ -0,0 +1,128 @@
+#version 330 core
+// Uniforms for shape information
+in vec3 worldSpace_pos;
+in vec3 worldSpace_norm;
+in vec2 tex_coord;
+
+in float visibility;
+
+uniform vec3 skyColor;
+
+// Object Material Data
+uniform int colorSource; // 0 = solid color (objColor), 1 = texture color (objTexture), 2 = per-vertex color (vertColor)
+uniform vec3 objColor;
+uniform sampler2D objTexture;
+in vec3 vertColor;
+uniform float shininess;
+
+// Camera uniform
+uniform vec3 worldSpace_camPos;
+
+// Global Data
+uniform vec3 coeffs; // vec3(ka, kd, ks)
+
+// Light Data
+uniform int lightType[16]; // 0 = point light, 1 = directional light
+uniform vec3 lightColor[16];
+uniform vec3 lightFunction[16]; // Attenuation coefficients
+uniform vec3 worldSpace_lightPos[16]; //Light Positions
+uniform vec3 worldSpace_lightDir[16]; //Light Directions
+uniform int numLights; // Max number of lights = 8
+
+out vec4 fragColor;
+
+vec3 getToLight(int lightIndex) {
+    int LIGHT_POINT = 0;
+    int LIGHT_DIRECTIONAL = 1;
+
+    if (lightType[lightIndex] == LIGHT_POINT) {
+        return normalize(worldSpace_lightPos[lightIndex] - worldSpace_pos);
+    }
+    else if (lightType[lightIndex] == LIGHT_DIRECTIONAL) {
+        return normalize(-worldSpace_lightDir[lightIndex]);
+    }
+
+    return vec3(0);
+}
+
+float attenuationFactor(int lightIndex) {
+    int LIGHT_POINT = 0;
+
+    if (lightType[lightIndex] == LIGHT_POINT) {
+        vec3 coeffs = lightFunction[lightIndex];
+        float d = length(worldSpace_lightPos[lightIndex] - worldSpace_pos);
+        return 1.0 / (coeffs.x + coeffs.y * d + coeffs.z * d * d);
+    }
+
+    return 1;
+}
+
+float computeDiffuseIntensity(vec3 worldSpace_toLight) {
+    // Dot product to get diffuse intensity
+    return max(dot(worldSpace_toLight, normalize(worldSpace_norm)), 0);
+}
+
+float computeSpecularIntensity(vec3 worldSpace_toLight, vec3 worldSpace_toEye) {
+    // Guard against pow weirdness when exponent is 0
+    if (shininess == 0) {
+        return 0;
+    }
+
+    //reflect toLight
+    vec3 worldSpace_toLightReflected = reflect(-worldSpace_toLight, normalize(worldSpace_norm));
+
+    //Compute specular intensity using toEye, reflected light, and shininess
+    return pow(max(dot(worldSpace_toLightReflected, worldSpace_toEye), 0), shininess);
+}
+
+void main() {
+    // Declare ambient, diffuse, and specular terms
+    vec3 ambi = vec3(coeffs.x);
+    vec3 diff = vec3(0.0);
+    vec3 spec = vec3(0.0);
+
+
+    // Compute worldSpace_toEye Vector for specular intensity computation;
+    vec3 worldSpace_toEye = normalize(worldSpace_camPos - worldSpace_pos);
+
+
+    // Compute per-light diffuse and specular contribution
+    for(int i = 0; i<numLights; i+= 1){
+
+        // get direction vector to light based on light type
+        vec3 worldSpace_toLight = getToLight(i);
+
+        float diffuse_intensity = computeDiffuseIntensity(worldSpace_toLight);
+        float specular_intensity = computeSpecularIntensity(worldSpace_toLight, worldSpace_toEye);
+
+        float att = attenuationFactor(i);
+
+
+        diff = diff + diffuse_intensity * lightColor[i] * att;
+        spec = spec + specular_intensity * lightColor[i] * att;
+    }
+
+    // Apply global coefficients and object color to the diffuse and specular components
+    diff = diff * vec3(coeffs.y);
+    spec = spec * vec3(coeffs.z);
+
+    // Color generated only from light intensities and colors
+    vec3 tempColor = clamp(ambi + diff + spec, 0, 1);
+
+    // Apply correct object color
+    if (colorSource == 0 ) {
+        fragColor = vec4(tempColor * objColor, 1.0);
+    } 
+    else if (colorSource == 1){
+        fragColor = vec4(tempColor * vec3(texture(objTexture, tex_coord)), 1.0);
+    }
+    else if (colorSource == 2) {
+        fragColor = vec4(tempColor * vertColor, 1.0);
+    }
+    else{
+        fragColor = vec4(tempColor, 1.0);
+    }
+
+    // mix actual color with fog color
+   // fragColor = mix(vec4(.77f, .85f, .99f, 1.f), fragColor, visibility);
+}