Add chapter 2.1-end

resources/console_no_bg.fs

@@ -0,0 +1,17 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+in vec3 ourBackground;
+
+// texture sampler
+uniform sampler2D texture1;
+
+void main()
+{
+    vec4 original = texture(texture1, TexCoord);
+    if (original.r < 0.1f || original.g < 0.1f || original.b < 0.1f) discard;
+    vec4 fg = original * vec4(ourColor, 1.f);
+	FragColor = fg;
+}