✨ Write shapes directly to wasm memory

render-wasm/src/main.rs

@@ -1,4 +1,5 @@
 pub mod render;
+pub mod shapes;
 
 use skia_safe as skia;
 
@@ -33,6 +34,19 @@ pub unsafe extern "C" fn draw_rect(state: *mut State, x1: f32, y1: f32, x2: f32,
     render::render_rect(&mut state.surface, r, skia::Color::RED);
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn draw_all_shapes(state: *mut State, zoom: f32, pan_x: f32, pan_y: f32) {
+    let state = unsafe { state.as_mut() }.expect("got an invalid state pointer");
+
+    reset_canvas(state);
+    scale(state, zoom, zoom);
+    translate(state, pan_x, pan_y);
+
+    shapes::draw_all(state);
+
+    flush(state);
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn flush(state: *mut State) {
     let state = unsafe { state.as_mut() }.expect("got an invalid state pointer");
@@ -60,6 +74,12 @@ pub unsafe extern "C" fn reset_canvas(state: *mut State) {
     flush(state);
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn shapes_buffer() -> *mut shapes::Shape {
+    let ptr = shapes::SHAPES_BUFFER.as_mut_ptr();
+    return ptr;
+}
+
 fn main() {
     render::init_gl();
 }

render-wasm/src/shapes.rs

@@ -0,0 +1,31 @@
+use crate::render::{render_rect, State};
+use skia_safe as skia;
+
+#[derive(Debug, Clone, Copy)]
+pub struct Selrect {
+    pub x1: f32,
+    pub y1: f32,
+    pub x2: f32,
+    pub y2: f32,
+}
+
+pub type Shape = Selrect; // temp
+
+pub static mut SHAPES_BUFFER: [Shape; 2048] = [Selrect {
+    x1: 0.0,
+    y1: 0.0,
+    x2: 0.0,
+    y2: 0.0,
+}; 2048];
+
+pub(crate) fn draw_all(state: &mut State) {
+    let shapes;
+    unsafe {
+        shapes = SHAPES_BUFFER.iter();
+    }
+
+    for shape in shapes {
+        let r = skia::Rect::new(shape.x1, shape.y1, shape.x2, shape.y2);
+        render_rect(&mut state.surface, r, skia::Color::RED);
+    }
+}