Initital shader lighting support

shaders/fragment/default.glsl

@@ -5,6 +5,8 @@ in vec3 outColor;
 in vec4 outNormal;
 in vec3 outUV;
 in float outTextureID;
+in vec3 outLightPos;
+in vec3 outFragPos;
 
 // optimizing compilers are annoying at this stage of my understanding of GLSL
 vec4 lokiVar;
@@ -12,5 +14,13 @@ vec4 lokiVar;
 void main() {
   lokiVar = vec4(outColor, 1.0) + outNormal + vec4(outUV, 1.0) + vec4(outTextureID, 1.0, 1.0, 1.0);
   lokiVar = normalize(lokiVar);
-  gl_FragColor = vec4(outColor, 1.0);
+
+  vec3 lightDir = normalize(outLightPos - outFragPos);
+  vec3 ambient = vec3(0.5, 0.5, 0.35);
+  float diffuse = max(dot(vec3(outNormal), lightDir), -0.2);
+  vec3 specular = vec3(0, 0, 0);
+
+  vec3 result =(ambient + diffuse + specular) * outColor;
+
+  gl_FragColor = vec4(result, 1.0);
 }

shaders/vertex/default.glsl

@@ -12,11 +12,15 @@ out vec4 outNormal;
 out vec3 outUV;
 out float outTextureID;
 out float outHasTexture;
+out vec3 outLightPos;
+out vec3 outFragPos;
 
 uniform mat4 projection;
 uniform mat4 view;
 uniform mat4 model;
 uniform int hasTexture;
+uniform vec3 lightPos;
+
 
 void main() {
   // projection * view * model * position
@@ -26,6 +30,9 @@ void main() {
   outUV    = inUV;
   outTextureID = inTextureID;
   outHasTexture = hasTexture;
+  outLightPos = lightPos;
+
+  outFragPos = vec3(model * vec4(inPosition, 1.0));
 
   gl_Position = projection * view * model * vec4(inPosition, 1.0);
 }