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"b07db065a5cf61a7e4ba64f29e67db906fb1787316516c4e6e5ff0fea1efcd8a" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..745958d --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,14 @@ +[package] +name = "gloom-rs" +version = "0.1.0" +authors = ["Michael H. Gimle "] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +glutin = "0.24.1" +gl = "0.14.0" +tobj = "2.0.2" +image = "0.23.8" +nalgebra-glm = "0.7.0" \ No newline at end of file diff --git a/shaders/simple.frag b/shaders/simple.frag new file mode 100644 index 0000000..0debe6e --- /dev/null +++ b/shaders/simple.frag @@ -0,0 +1,8 @@ +#version 460 core +layout(binding = 0) uniform sampler2D t; +in vec3 vColor; +in vec2 vUv; +out vec4 color; +void main() { + color = vec4(vUv, 0, 1.0f); +} \ No newline at end of file diff --git a/shaders/simple.vert b/shaders/simple.vert new file mode 100644 index 0000000..60103b7 --- /dev/null +++ b/shaders/simple.vert @@ -0,0 +1,16 @@ +#version 460 core +layout (location = 0) in vec3 pos; +layout (location = 1) in vec3 iColor; +layout (location = 2) in vec2 uv; +layout (location = 0) uniform float val; +// layout (location = 0) uniform mat4 P; +// layout (location = 1) uniform mat4 V; +// layout (location = 2) uniform mat4 M; +out vec3 vColor; +out vec2 vUv; +void main() { + // gl_Position = P * V * M * vec4(pos.xyz, 1.0f); + gl_Position = vec4(pos.x, pos.y + val, pos.z, 1.0f); + vColor = iColor; + vUv = uv; +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..3939421 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,190 @@ +extern crate nalgebra_glm as glm; +use gl::types::*; +use std::{ + mem, + ptr, + str, + os::raw::c_void, +}; +use std::thread; +use std::sync::{Mutex, Arc, RwLock}; + +mod shader; +mod util; + +use glutin::event::{Event, WindowEvent, KeyboardInput, ElementState::{Pressed, Released}, VirtualKeyCode::{self, *}}; +use glutin::event_loop::ControlFlow; + +const SCREEN_W: u32 = 800; +const SCREEN_H: u32 = 600; + +// Helper functions to make interacting with OpenGL a little bit prettier. You will need these! +// The names should be pretty self explanatory +fn byte_size_of_array(val: &[T]) -> isize { + std::mem::size_of_val(&val[..]) as isize +} + +// Get the OpenGL-compatible pointer to an arbitrary array of numbers +fn pointer_to_array(val: &[T]) -> *const c_void { + &val[0] as *const T as *const c_void +} + +// Get the size of the given type in bytes +fn size_of() -> i32 { + mem::size_of::() as i32 +} + +// Get an offset in bytes for n units of type T +fn offset(n: u32) -> *const c_void { + (n * mem::size_of::() as u32) as *const T as *const c_void +} + +// == // Modify and complete the function below for the first task +// unsafe fn FUNCTION_NAME(ARGUMENT_NAME: &Vec, ARGUMENT_NAME: &Vec) -> u32 { } + +fn main() { + // Set up the necessary objects to deal with windows and event handling + let el = glutin::event_loop::EventLoop::new(); + let wb = glutin::window::WindowBuilder::new() + .with_title("Gloom-rs") + .with_resizable(false) + .with_inner_size(glutin::dpi::LogicalSize::new(SCREEN_W, SCREEN_H)); + let cb = glutin::ContextBuilder::new() + .with_vsync(true); + let windowed_context = cb.build_windowed(wb, &el).unwrap(); + + // Set up a shared vector for keeping track of currently pressed keys + let arc_pressed_keys = Arc::new(Mutex::new(Vec::::with_capacity(10))); + // Send a copy of this vector to send to the render thread + let pressed_keys = Arc::clone(&arc_pressed_keys); + + // Spawn a separate thread for rendering, so event handling doesn't block rendering + let render_thread = thread::spawn(move || { + // Acquire the OpenGL Context and load the function pointers. This has to be done inside of the renderin thread, because + // an active OpenGL context cannot safely traverse a thread boundary + let context = unsafe { + let c = windowed_context.make_current().unwrap(); + gl::load_with(|symbol| c.get_proc_address(symbol) as *const _); + c + }; + + // Set up openGL + unsafe { + gl::Enable(gl::CULL_FACE); + gl::Disable(gl::MULTISAMPLE); + gl::Enable(gl::BLEND); + gl::BlendFunc(gl::SRC_ALPHA, gl::ONE_MINUS_SRC_ALPHA); + gl::Enable(gl::DEBUG_OUTPUT_SYNCHRONOUS); + gl::DebugMessageCallback(Some(util::debug_callback), ptr::null()); + } + + // == // Set up your VAO here + + + + + // Used to demonstrate keyboard handling -- feel free to remove + let mut _arbitrary_number = 0.0; + + let first_frame_time = std::time::Instant::now(); + let mut last_frame_time = first_frame_time; + // The main rendering loop + loop { + let now = std::time::Instant::now(); + let elapsed = now.duration_since(first_frame_time).as_secs_f32(); + let delta_time = now.duration_since(last_frame_time).as_secs_f32(); + last_frame_time = now; + + // Handle keyboard input + if let Ok(keys) = pressed_keys.lock() { + for key in keys.iter() { + match key { + VirtualKeyCode::A => { + _arbitrary_number += delta_time; + }, + VirtualKeyCode::D => { + _arbitrary_number -= delta_time; + }, + + + _ => { } + } + } + } + + unsafe { + gl::ClearColor(0.163, 0.163, 0.163, 1.0); + gl::Clear(gl::COLOR_BUFFER_BIT); + + // Issue the necessary commands to draw your scene here + + + + + + + } + + context.swap_buffers().unwrap(); + } + }); + + // Keep track of the health of the rendering thread + let render_thread_healthy = Arc::new(RwLock::new(true)); + let render_thread_watchdog = Arc::clone(&render_thread_healthy); + thread::spawn(move || { + if !render_thread.join().is_ok() { + if let Ok(mut health) = render_thread_watchdog.write() { + println!("Render thread panicked!"); + *health = false; + } + } + }); + + // Start the event loop -- This is where window events get handled + el.run(move |event, _, control_flow| { + *control_flow = ControlFlow::Wait; + + // Terminate program if render thread panics + if let Ok(health) = render_thread_healthy.read() { + if *health == false { + *control_flow = ControlFlow::Exit; + } + } + + match event { + Event::WindowEvent { event: WindowEvent::CloseRequested, .. } => { + *control_flow = ControlFlow::Exit; + }, + // Keep track of currently pressed keys to send to the rendering thread + Event::WindowEvent { event: WindowEvent::KeyboardInput { + input: KeyboardInput { state: key_state, virtual_keycode: Some(keycode), .. }, .. }, .. } => { + + if let Ok(mut keys) = arc_pressed_keys.lock() { + match key_state { + Released => { + if keys.contains(&keycode) { + let i = keys.iter().position(|&k| k == keycode).unwrap(); + keys.remove(i); + } + }, + Pressed => { + if !keys.contains(&keycode) { + keys.push(keycode); + } + } + } + } + + // Handle escape separately + match keycode { + Escape => { + *control_flow = ControlFlow::Exit; + }, + _ => { } + } + }, + _ => { } + } + }); +} diff --git a/src/shader.rs b/src/shader.rs new file mode 100644 index 0000000..191e9f3 --- /dev/null +++ b/src/shader.rs @@ -0,0 +1,141 @@ +use gl; +use std::{ + ptr, + str, + ffi::CString, + path::Path, +}; + +pub struct Shader { + pub program_id: u32, +} + +pub struct ShaderBuilder { + program_id: u32, + shaders: Vec::, +} + +#[allow(dead_code)] +pub enum ShaderType { + Vertex, + Fragment, + TessellationControl, + TessellationEvaluation, + Geometry, +} + +impl Into for ShaderType { + fn into(self) -> gl::types::GLenum { + match self { + ShaderType::Vertex => { gl::VERTEX_SHADER }, + ShaderType::Fragment => { gl::FRAGMENT_SHADER }, + ShaderType::TessellationControl => { gl::TESS_CONTROL_SHADER }, + ShaderType::TessellationEvaluation => { gl::TESS_EVALUATION_SHADER } , + ShaderType::Geometry => { gl::GEOMETRY_SHADER }, + } + } +} + +impl ShaderType { + fn from_ext(ext: &std::ffi::OsStr) -> Result { + match ext.to_str().expect("Failed to read extension") { + "vert" => { Ok(ShaderType::Vertex) }, + "frag" => { Ok(ShaderType::Fragment) }, + "tcs" => { Ok(ShaderType::TessellationControl) }, + "tes" => { Ok(ShaderType::TessellationEvaluation) }, + "geom" => { Ok(ShaderType::Geometry) }, + e => { Err(e.to_string()) }, + } + } +} + +impl ShaderBuilder { + pub unsafe fn new() -> ShaderBuilder { + ShaderBuilder { + program_id: gl::CreateProgram(), + shaders: vec![], + } + } + + pub unsafe fn attach_file(self, shader_path: &str) -> ShaderBuilder { + let path = Path::new(shader_path); + if let Some(extension) = path.extension() { + let shader_type = ShaderType::from_ext(extension) + .expect("Failed to parse file extension."); + let shader_src = std::fs::read_to_string(path) + .expect(&format!("Failed to read shader source. {}", shader_path)); + self.compile_shader(&shader_src, shader_type) + } else { + panic!("Failed to read extension of file with path: {}", shader_path); + } + } + + pub unsafe fn compile_shader(mut self, shader_src: &str, shader_type: ShaderType) -> ShaderBuilder { + let shader = gl::CreateShader(shader_type.into()); + let c_str_shader = CString::new(shader_src.as_bytes()).unwrap(); + gl::ShaderSource(shader, 1, &c_str_shader.as_ptr(), ptr::null()); + gl::CompileShader(shader); + + if !self.check_shader_errors(shader) { + panic!("Shader failed to compile."); + } + + self.shaders.push(shader); + + self + } + + unsafe fn check_shader_errors(&self, shader_id: u32) -> bool { + let mut success = i32::from(gl::FALSE); + let mut info_log = Vec::with_capacity(512); + info_log.set_len(512 - 1); + gl::GetShaderiv(shader_id, gl::COMPILE_STATUS, &mut success); + if success != i32::from(gl::TRUE) { + gl::GetShaderInfoLog( + shader_id, + 512, + ptr::null_mut(), + info_log.as_mut_ptr() as *mut gl::types::GLchar, + ); + println!("ERROR::Shader Compilation Failed!\n{}", String::from_utf8_lossy(&info_log)); + return false; + } + true + } + + unsafe fn check_linker_errors(&self) -> bool { + let mut success = i32::from(gl::FALSE); + let mut info_log = Vec::with_capacity(512); + info_log.set_len(512 - 1); + gl::GetProgramiv(self.program_id, gl::LINK_STATUS, &mut success); + if success != i32::from(gl::TRUE) { + gl::GetProgramInfoLog( + self.program_id, + 512, + ptr::null_mut(), + info_log.as_mut_ptr() as *mut gl::types::GLchar, + ); + println!("ERROR::SHADER::PROGRAM::COMPILATION_FAILED\n{}", String::from_utf8_lossy(&info_log)); + return false; + } + true + } + + pub unsafe fn link(self) -> Shader { + for &shader in &self.shaders { + gl::AttachShader(self.program_id, shader); + } + gl::LinkProgram(self.program_id); + + // todo:: use this to make safer abstraction + self.check_linker_errors(); + + for &shader in &self.shaders { + gl::DeleteShader(shader); + } + + Shader { + program_id: self.program_id + } + } +} diff --git a/src/util.rs b/src/util.rs new file mode 100644 index 0000000..b3ca0b0 --- /dev/null +++ b/src/util.rs @@ -0,0 +1,28 @@ +use std::ffi::CString; + +// Debug callback to panic upon enountering any OpenGL error +pub extern "system" fn debug_callback( + source: u32, e_type: u32, id: u32, + severity: u32, _length: i32, + msg: *const i8, _data: *mut std::ffi::c_void +) { + if e_type != gl::DEBUG_TYPE_ERROR { return } + if severity == gl::DEBUG_SEVERITY_HIGH || + severity == gl::DEBUG_SEVERITY_MEDIUM || + severity == gl::DEBUG_SEVERITY_LOW + { + let severity_string = match severity { + gl::DEBUG_SEVERITY_HIGH => "high", + gl::DEBUG_SEVERITY_MEDIUM => "medium", + gl::DEBUG_SEVERITY_LOW => "low", + _ => "unknown", + }; + unsafe { + let string = CString::from_raw(msg as *mut i8); + let error_message = String::from_utf8_lossy(string.as_bytes()).to_string(); + panic!("{}: Error of severity {} raised from {}: {}\n", + id, severity_string, source, error_message); + } + } +} +