Added texture support.

assets/shaders/test.frag

@@ -1,6 +1,14 @@
 #version 330 core
+
+in vec2 TexCoord;
+
+uniform sampler2D u_Text;
+
 out vec4 FragColor;
 
 void main() {
-  FragColor = vec4(1, 1, 1, 1);
+  vec4 color = texture(u_Text, TexCoord);
+  FragColor = color;
+  // FragColor = color + vec4(0.5, 0.5, 0.5, 1);
+  // FragColor = vec4(1, 1, 1, 1);
 }