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use crate::blend::{BlendEquation, BlendFunction, BlendMode};
use crate::depth::DepthTestMode;
use crate::{GlFramebuffer, GlProgram, GlVertexArray, GolemError};
use alloc::rc::Rc;
use core::cell::RefCell;
use glow::HasContext;
pub struct Context(pub(crate) Rc<ContextContents>);
pub(crate) struct ContextContents {
pub(crate) gl: glow::Context,
pub(crate) current_program: RefCell<Option<GlProgram>>,
pub(crate) current_surface: RefCell<Option<GlFramebuffer>>,
vao: GlVertexArray,
}
impl Drop for ContextContents {
fn drop(&mut self) {
unsafe {
self.gl.delete_vertex_array(self.vao);
}
}
}
impl Context {
pub fn from_glow(gl: glow::Context) -> Result<Context, GolemError> {
let vao = unsafe {
let vao = gl.create_vertex_array()?;
gl.bind_vertex_array(Some(vao));
vao
};
let contents = Context(Rc::new(ContextContents {
gl,
current_program: RefCell::new(None),
current_surface: RefCell::new(None),
vao,
}));
contents.set_clear_color(0.0, 0.0, 0.0, 1.0);
Ok(contents)
}
pub fn set_viewport(&self, x: u32, y: u32, width: u32, height: u32) {
unsafe {
self.0
.gl
.viewport(x as i32, y as i32, width as i32, height as i32);
}
}
pub fn set_clear_color(&self, r: f32, g: f32, b: f32, a: f32) {
unsafe {
self.0.gl.clear_color(r, g, b, a);
}
}
pub fn clear(&self) {
let gl = &self.0.gl;
unsafe {
gl.clear(glow::COLOR_BUFFER_BIT | glow::DEPTH_BUFFER_BIT);
}
}
pub fn set_blend_mode(&self, blend_state: Option<BlendMode>) {
let gl = &self.0.gl;
match blend_state {
Some(BlendMode {
equation,
function,
global_color: [r, g, b, a],
}) => unsafe {
gl.enable(glow::BLEND);
match equation {
BlendEquation::Same(eq) => gl.blend_equation(eq.to_gl()),
BlendEquation::Separate { color, alpha } => {
gl.blend_equation_separate(color.to_gl(), alpha.to_gl());
}
}
match function {
BlendFunction::Same {
source,
destination,
} => {
gl.blend_func(source.to_gl(), destination.to_gl());
}
BlendFunction::Separate {
source_color,
source_alpha,
destination_alpha,
destination_color,
} => {
gl.blend_func_separate(
source_color.to_gl(),
source_alpha.to_gl(),
destination_alpha.to_gl(),
destination_color.to_gl(),
);
}
}
gl.blend_color(r, g, b, a);
},
None => unsafe {
gl.disable(glow::BLEND);
},
}
}
pub fn set_depth_test_mode(&self, depth_test_state: Option<DepthTestMode>) {
let gl = &self.0.gl;
match depth_test_state {
Some(DepthTestMode {
function,
range_near,
range_far,
depth_mask,
}) => unsafe {
gl.enable(glow::DEPTH_TEST);
gl.depth_func(function.to_gl());
#[cfg(not(target_arch = "wasm32"))]
gl.depth_range_f64(range_near as f64, range_far as f64);
#[cfg(target_arch = "wasm32")]
gl.depth_range_f32(range_near, range_far);
gl.depth_mask(depth_mask);
},
None => unsafe {
gl.disable(glow::DEPTH_TEST);
},
}
}
}