Fix first stroke preview not showing

client/speed.js

@@ -65,27 +65,28 @@ async function init_wasm(state) {
 
     state.wasm.buffers = {
         'xs': {
-            'offset': state.wasm.exports.alloc_static(initial),
             'used': 0,
             'cap': initial
         },
         'ys': {
-            'offset': state.wasm.exports.alloc_static(initial),
             'used': 0,
             'cap': initial
         },
         'coords_from': {
-            'offset': state.wasm.exports.alloc_static(initial),
             'used': 0,
             'cap': initial
         },
         'pressures': {
-            'offset': state.wasm.exports.alloc_static(initial),
             'used': 0,
             'cap': initial
         },
     };
 
+    state.wasm.buffers['xs'].offset = state.wasm.exports.alloc_static(initial);
+    state.wasm.buffers['ys'].offset = state.wasm.exports.alloc_static(initial);
+    state.wasm.buffers['pressures'].offset = state.wasm.exports.alloc_static(initial);
+    state.wasm.buffers['coords_from'].offset = state.wasm.exports.alloc_static(initial);
+
     const mem = state.wasm.memory.buffer;
 
     state.wasm.buffers['xs'].tv = tv_create_on(Float32Array, initial / 4, 

client/webgl_draw.js

@@ -323,6 +323,14 @@ async function draw(state, context, animate, ts) {
         gl.bindTexture(gl.TEXTURE_2D, context.textures['dynamic_stroke_data']);
         upload_square_rgba16ui_texture(gl, context.dynamic_stroke_data, config.dynamic_stroke_texture_size);
 
+        gl.uniform2f(locations['u_res'], context.canvas.width, context.canvas.height);
+        gl.uniform2f(locations['u_scale'], state.canvas.zoom, state.canvas.zoom);
+        gl.uniform2f(locations['u_translation'], state.canvas.offset.x, state.canvas.offset.y);
+        gl.uniform1i(locations['u_stroke_count'], context.dynamic_stroke_count);
+        gl.uniform1i(locations['u_debug_mode'], state.debug.red);
+        gl.uniform1i(locations['u_stroke_data'], 0);
+        gl.uniform1i(locations['u_stroke_texture_size'], config.dynamic_stroke_texture_size);
+
         gl.enableVertexAttribArray(locations['a_a']);
         gl.enableVertexAttribArray(locations['a_b']);
         gl.enableVertexAttribArray(locations['a_stroke_id']);