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use std::ffi::{c_void, CString};
use std::process::abort;
use cstr::cstr;
use glfw::WindowSize;
use crate::camera::Camera;
use crate::object::Object;
use crate::opengl::buffer::{
ArrayKind as ArrayBufferKind,
Buffer,
ElementArrayKind as ElementArrayBufferKind,
Usage as BufferUsage,
};
#[cfg(feature = "debug")]
use crate::opengl::debug::{MessageSeverity, MessageSource, MessageType};
use crate::opengl::shader::Program as ShaderProgram;
use crate::opengl::vertex_array::{PrimitiveKind, VertexArray};
use crate::opengl::{clear_buffers, BufferClearMask};
use crate::projection::new_perspective;
use crate::vector::Vec2;
use crate::vertex::Vertex;
pub fn initialize(window: &glfw::Window) -> Result<(), Error>
{
gl::load_with(|symbol| {
let proc_name = unsafe { CString::from_vec_unchecked(symbol.into()) };
match window.get_proc_address(proc_name.as_c_str()) {
Ok(addr) => addr as *const c_void,
Err(err) => {
println!(
"FATAL ERROR: Failed to get adress of OpenGL function {}. {}",
symbol, err
);
abort();
}
}
});
#[cfg(feature = "debug")]
{
use crate::opengl::debug::{
enable_debug_output,
set_debug_message_callback,
set_debug_message_control,
MessageIdsAction,
};
enable_debug_output();
set_debug_message_callback(opengl_debug_message_cb);
set_debug_message_control(None, None, None, &[], MessageIdsAction::Disable);
}
let window_size = window.size().map_err(Error::GetWindowSizeFailed)?;
set_viewport(&Vec2 { x: 0, y: 0 }, &window_size);
Ok(())
}
#[cfg(feature = "debug")]
#[tracing::instrument(skip_all)]
fn opengl_debug_message_cb(
source: MessageSource,
ty: MessageType,
id: u32,
severity: MessageSeverity,
message: &str,
)
{
use std::backtrace::{Backtrace, BacktraceStatus};
use tracing::{event, Level};
macro_rules! create_event {
($level: expr) => {
event!($level, ?source, ?ty, id, ?severity, message);
};
}
match ty {
MessageType::Error => {
create_event!(Level::ERROR);
let backtrace = Backtrace::capture();
if matches!(backtrace.status(), BacktraceStatus::Captured) {
event!(Level::TRACE, "{backtrace}");
}
}
MessageType::Other => {
create_event!(Level::INFO);
}
_ => {
create_event!(Level::WARN);
}
};
}
pub fn render<'obj>(
objects: impl IntoIterator<Item = &'obj Object>,
window_size: &WindowSize,
camera: &Camera,
)
{
clear_buffers(BufferClearMask::COLOR);
for obj in objects {
obj.renderable().shader_program.activate();
apply_transformation_matrices(obj, camera, window_size);
obj.renderable().vertex_arr.bind(|vert_arr_curr_bound| {
if let Some(index_info) = &obj.renderable().index_info {
VertexArray::draw_elements(
&vert_arr_curr_bound,
PrimitiveKind::Triangles,
0,
index_info.cnt,
);
} else {
VertexArray::draw_arrays(
&vert_arr_curr_bound,
PrimitiveKind::Triangles,
0,
3,
);
}
});
}
}
pub fn set_viewport(position: &Vec2<u32>, size: &WindowSize)
{
crate::opengl::set_viewport(position, size);
}
#[derive(Debug)]
pub struct Renderable
{
shader_program: ShaderProgram,
vertex_arr: VertexArray,
/// Vertex and index buffer has to live as long as the vertex array
_vertex_buffer: Buffer<Vertex, ArrayBufferKind>,
index_info: Option<IndexInfo>,
}
#[derive(Debug)]
struct IndexInfo
{
_buffer: Buffer<u32, ElementArrayBufferKind>,
cnt: u32,
}
impl Renderable
{
pub fn new(
shader_program: ShaderProgram,
vertices: &[Vertex],
indices: Option<&[u32]>,
) -> Self
{
let vertex_arr = VertexArray::new();
let vertex_buffer = Buffer::new();
let mut index_info = None;
vertex_arr.bind(|vert_arr_curr_bound| {
vertex_buffer.bind(|vert_buf_curr_bound| {
Buffer::store(&vert_buf_curr_bound, vertices, BufferUsage::Static);
VertexArray::configure_attrs(&vert_arr_curr_bound, &vert_buf_curr_bound);
});
if let Some(indices) = indices {
let new_index_buffer = Buffer::new();
new_index_buffer.bind(|index_buf_curr_bound| {
Buffer::store(&index_buf_curr_bound, indices, BufferUsage::Static);
});
index_info = Some(IndexInfo {
_buffer: new_index_buffer,
cnt: indices.len().try_into().unwrap(),
});
}
});
Self {
shader_program,
vertex_arr,
_vertex_buffer: vertex_buffer,
index_info,
}
}
}
/// Renderer error.
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("Failed to get window size")]
GetWindowSizeFailed(#[source] glfw::Error),
}
fn apply_transformation_matrices(
object: &Object,
camera: &Camera,
window_size: &WindowSize,
)
{
object
.renderable()
.shader_program
.set_uniform_matrix_4fv(cstr!("model"), &object.transform().as_matrix());
let view = camera.transform().as_matrix();
object
.renderable()
.shader_program
.set_uniform_matrix_4fv(cstr!("view"), &view);
#[allow(clippy::cast_precision_loss)]
let projection = new_perspective(
80.0f32.to_radians(),
window_size.width as f32 / window_size.height as f32,
0.1,
100.0,
);
object
.renderable()
.shader_program
.set_uniform_matrix_4fv(cstr!("projection"), &projection);
}
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