continued with asset loader

default_assets/shaders/phong.frag

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+#version 400
+
+out vec4 FragColor;
+
+in vec3 Position;
+in vec2 TexCoord;
+in vec3 Normal;
+
+uniform sampler2D diffuseMap;
+uniform sampler2D specularMap;
+
+uniform vec3 viewPosition;
+
+uniform vec3 phongAmbient;
+uniform vec3 phongDiffuse;
+uniform vec3 phongSpecular;
+uniform float phongShininess;
+
+uniform vec3 lightPosition;
+uniform vec3 lightDirection;
+uniform vec3 lightAmbient;
+uniform vec3 lightDiffuse;
+uniform vec3 lightSpecular;
+
+void main() {
+    vec3 diffuseColor = texture(diffuseMap, TexCoord).rgb;
+    vec3 specularColor = texture(specularMap, TexCoord).rgb;
+
+    vec3 norm = normalize(Normal);
+    vec3 lightDir = normalize(-lightDirection);
+    vec3 viewDir = normalize(viewPosition - Position);
+    vec3 halfwayDir = normalize(lightDir + viewDir);
+
+    vec3 ambient = lightAmbient * (diffuseColor * phongAmbient);
+
+    float diffImpact = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = lightDiffuse * (diffImpact * diffuseColor * phongDiffuse);
+
+    vec3 reflectDir = reflect(-lightDir, norm);
+    float effectiveShininess = max(phongShininess, 1.0);
+    float spec = pow(max(dot(norm, halfwayDir), 0.0), effectiveShininess);
+    vec3 specular = lightSpecular * (spec * specularColor * phongSpecular);
+
+    vec3 result = ambient + diffuse + specular;
+
+    float gamma = 2.2;
+    FragColor.rgb = pow(result.rgb, vec3(1.0/gamma));
+}