From be18a9a0503fa09318b5d99452a3407a92db4366 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juan=20Manuel=20Tom=C3=A1s?= <jtomas1815@gmail.com>
Date: Sun, 17 Jan 2021 21:21:55 -0300
Subject: Add new points to the bezier curve interactively

---
 src/main.rs | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index 2c5dbcc..f01526b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,7 +21,7 @@ fn shader_from_source(source: &CStr, shader_type: GLenum) -> GLuint {
     }
 }
 
-fn compile_bezier_shader(c: Bezier) -> GLuint {
+fn compile_bezier_shader(c: &Bezier) -> GLuint {
     let vertex_shader_source = b"
     #version 410 core
     layout (location = 0) in vec3 aPos;
@@ -121,17 +121,13 @@ fn compile_bezier_shader(c: Bezier) -> GLuint {
         gl::LinkProgram(shader_program);
         gl::DeleteShader(vertex_shader);
         gl::DeleteShader(fragment_shader);
+        gl::UseProgram(shader_program);
     }
     shader_program
 }
 
 fn main() {
     let mut curve = Bezier::new();
-    curve.push(200, 200);
-    curve.push(300, 800);
-    curve.push(800, 100);
-    curve.push(1300, 800);
-    curve.push(1400, 200);
 
     let sdl_context = sdl2::init().unwrap();
     let video_subsystem = sdl_context.video().unwrap();
@@ -185,10 +181,10 @@ fn main() {
         gl::EnableVertexAttribArray(0);
     }
 
-    let shader_program = compile_bezier_shader(curve);
-
     let mut event_pump = sdl_context.event_pump().unwrap();
     'running: loop {
+        let x = event_pump.mouse_state().x();
+        let y = event_pump.mouse_state().y();
         for event in event_pump.poll_iter() {
             match event {
                 Event::Quit { .. }
@@ -196,13 +192,19 @@ fn main() {
                     keycode: Some(Keycode::Escape),
                     ..
                 } => break 'running,
+                Event::KeyDown {
+                    keycode: Some(Keycode::A),
+                    ..
+                } => {
+                    curve.push(x, window_h as i32 - y);
+                    compile_bezier_shader(&curve);
+                },
                 _ => {}
             }
         }
 
         unsafe {
             gl::Clear(gl::COLOR_BUFFER_BIT);
-            gl::UseProgram(shader_program);
             gl::DrawArrays(gl::TRIANGLES, 0, 6);
         }
 
-- 
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