Add chapter 2.1-end

resources/scanlines.fs

@@ -0,0 +1,26 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+uniform vec3 screenSize;
+uniform bool screenBurn;
+
+void main()
+{
+    vec3 col = texture(screenTexture, TexCoords).rgb;
+    float scanLine = mod(gl_FragCoord.y, 2.0) * 0.25;
+    vec3 scanColor = col.rgb - scanLine;
+
+    if (col.r < 0.1f && col.g < 0.1f && col.b < 0.1f) {
+        if (screenBurn) {
+            float dist = (1.0 - distance(vec2(gl_FragCoord.x / screenSize.x, gl_FragCoord.y / screenSize.y), vec2(0.5,0.5))) * 0.2;
+            FragColor = vec4(0.0, dist, dist, 1.0);
+        } else {
+            FragColor = vec4(0.0, 0.0, 0.0, 1.0);
+        }
+    } else {
+        FragColor = vec4(scanColor, 1.0);
+    }
+}