Initial commit

resources/shaders/fragment/solid-phong.frag

@@ -0,0 +1,49 @@
+#version 330
+// Color input from Vertex shader
+in vec4 vColor;
+in vec3 vNormal;
+in vec3 vPosition;
+
+// Final fragment fColor
+out vec4 fColor;
+
+// Light color RGB value
+uniform vec3 uLightColor;
+// Light object and camera position vectors
+uniform vec3 uLightPosition;
+uniform vec3 uCameraPosition;
+
+// Strength ranges 0.0f - 1.0f
+uniform float uAmbientStrength;  // 0.2f
+uniform float uSpecularStrength; // 0.25f
+// 32, 64, 128, 256
+uniform int uSpecularShine; // 64
+
+void main()
+{
+  // Ambient lighting
+  vec3 ambient = uAmbientStrength * uLightColor;
+
+  // Diffuse lighting
+  vec3 norm = normalize(vNormal);
+  vec3 lightDir = normalize(uLightPosition - vPosition);
+  float diff = max(dot(norm, lightDir), 0.0f);
+
+  vec3 diffuse = diff * uLightColor;
+
+  // Specular lighting
+  vec3 viewDir = normalize(uCameraPosition - vPosition);
+  vec3 reflectDir = reflect(-lightDir, norm);
+
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), uSpecularShine);
+  vec3 specular = uSpecularStrength * spec * uLightColor;
+
+  //
+  // Final calculation
+
+  // Strip vColor to vec3 to drop alpha
+  vec3 result = (ambient + diffuse + specular) * vec3(vColor);
+
+  // Final output
+  fColor = vec4(result, 1.0f); // Reapply alpha
+}