feat: implemented default shader

resources/default_shader.fs

@@ -0,0 +1,20 @@
+#version 330
+
+in vec2 fragTexCoord; // texture coordinate
+in vec3 fragNormal;   // normal direction
+
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+out vec4 finalColor;
+
+uniform vec3 lightDirection; // direction of light
+uniform vec4 ambient;
+
+void main() {
+    vec4 texelColor = texture(texture0, fragTexCoord);
+    vec3 light_dot = vec3(pow(dot(fragNormal, lightDirection)-0.2, 3.0));
+    finalColor = texelColor * colDiffuse * vec4(light_dot, 1.0);
+    finalColor += texelColor * (ambient/10.0) * colDiffuse;
+    finalColor = pow(finalColor, vec4(vec3(0.6), 1.0));
+}

resources/default_shader.vs

@@ -0,0 +1,25 @@
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matModel;
+
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+out vec3 fragNormal;
+
+void main()
+{
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragNormal = normalize(vec3(matModel * vec4(vertexNormal, 1.0)));
+
+    // Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}