Impl Drop for Framebuffer, Texture and Shader. Regenerate framebuffer on size change

resources/shaders/framebuffers_screen.fs

@@ -3,10 +3,17 @@ out vec4 FragColor;
 
 in vec2 TexCoords;
 
+uniform float screen_width;
+uniform float screen_height;
 uniform sampler2D screenTexture;
 
 void main()
 {
-    vec3 col = texture(screenTexture, TexCoords).rgb;
-    FragColor = vec4(col, 1.0);
+    vec2 uv = TexCoords.xy;
+    uv *=  1.0 - uv.yx;
+    float vig = uv.x*uv.y * 15.0;
+    vig = pow(vig, 0.3);
+
+    
+    FragColor = texture(screenTexture, TexCoords) * vig;
 }

src/gaia/engine.rs

@@ -127,6 +127,7 @@ impl Engine {
                     // height will be significantly larger than specified on retina displays.
                     unsafe { gl::Viewport(0, 0, width, height) }
                     self.window_size = (width as f32, height as f32);
+                    self.framebuffer = unsafe { FramebufferSystem::generate(width, height) };
                 }
                 glfw::WindowEvent::CursorPos(xpos, ypos) => {
                     if skip_input {
@@ -265,8 +266,8 @@ impl Default for Engine {
         unsafe {
             gl::Enable(gl::DEPTH_TEST);
         }
-        let (scr_width, scr_height) = window.get_framebuffer_size();
         let client = ExampleClient::create(&window);
+        let (scr_width, scr_height) = window.get_framebuffer_size();
         let fb = unsafe { FramebufferSystem::generate(scr_width, scr_height) };
         println!("{:?}", fb);
 

src/gaia/framebuffer.rs

@@ -15,9 +15,11 @@ pub struct FramebufferSystem {
 
 impl Drop for FramebufferSystem {
     fn drop(&mut self) {
+        println!("Drop framebuffer!");
         unsafe {
             gl::DeleteVertexArrays(1, &self.vao);
             gl::DeleteBuffers(1, &self.vbo);
+            gl::DeleteFramebuffers(1, &self.framebuffer);
         }
     }
 }
@@ -85,6 +87,8 @@ impl FramebufferSystem {
         );
         screenShader.use_program();
         screenShader.setInt(c_str!("screenTexture"), 0);
+        screenShader.setFloat(c_str!("screen_width"), scr_width as f32);
+        screenShader.setFloat(c_str!("screen_height"), scr_height as f32);
 
         // framebuffer configuration
         // -------------------------

src/gaia/mesh.rs

@@ -49,6 +49,12 @@ pub struct Texture {
     pub path: String,
 }
 
+impl Drop for Texture {
+    fn drop(&mut self) {
+        unsafe { gl::DeleteTextures(1, &self.id); }
+    }
+}
+
 #[derive(Clone)]
 pub struct Mesh {
     /*  Mesh Data  */

src/gaia/shader.rs

@@ -10,13 +10,19 @@ use gl::types::*;
 
 use crate::gaia::consts;
 use cgmath::prelude::*;
-use cgmath::{Matrix, Matrix4, Vector3};
+use cgmath::{Matrix, Matrix4, Vector3, Vector2};
 
 #[derive(Debug)]
 pub struct Shader {
     pub ID: u32,
 }
 
+impl Drop for Shader {
+    fn drop(&mut self) {
+        unsafe{gl::DeleteShader(self.ID);}
+    }
+}
+
 impl Default for Shader {
     fn default() -> Self {
         let vShaderCode = CString::new(consts::VERTEX_SHADER_SRC.as_bytes()).unwrap();
@@ -108,6 +114,13 @@ impl Shader {
             value.as_ptr(),
         );
     }
+    pub unsafe fn set_vector2(&self, name: &CStr, value: &Vector2<f32>) {
+        gl::Uniform2fv(
+            gl::GetUniformLocation(self.ID, name.as_ptr()),
+            1,
+            value.as_ptr(),
+        );
+    }
     /// ------------------------------------------------------------------------
     pub unsafe fn set_vec3(&self, name: &CStr, x: f32, y: f32, z: f32) {
         gl::Uniform3f(gl::GetUniformLocation(self.ID, name.as_ptr()), x, y, z);