A simple (and bad) LOD determination scheme

client/webgl_draw.js

@@ -273,23 +273,8 @@ async function draw(state, context, animate, ts) {
         }
     }
 
-    if (false) {
+    // TODO: what do we do with this
-    // TODO: @speed maybe we can get this while clipping "for free"?
+    const circle_lod = Math.ceil(Math.min(7, 1 + Math.sqrt(state.canvas.zoom)));
-    let largest_width = 0;
-
-    for (let i = 0; i < context.clipped_indices.size; ++i) {
-        const stroke_id = context.clipped_indices.data[i];
-        const stroke = state.events[stroke_id];
-        if (stroke.width > largest_width) {
-            largest_width = stroke.width;
-        }
-    }
-
-    largest_width *= state.canvas.zoom;
-    }
-
-    // Largest distance from N-th circle LOD to a real circle should be less than 1 unit (pixel)
-    const circle_lod = 4; // largest_width > 0 ? Math.ceil(Math.PI / Math.acos(1 - 1 / largest_width)) : 0;
     const circle_data = geometry_good_circle_and_dummy(circle_lod);
 
     // "Static" data upload

client/webgl_shaders.js

@@ -12,7 +12,6 @@ const sdf_vs_src = `#version 300 es
     uniform int u_stroke_count;
     uniform int u_stroke_texture_size;
     uniform highp usampler2D u_stroke_data;
-    uniform float u_fixed_pixel_width;
     uniform int u_circle_points;
 
     out vec3 v_color;
@@ -34,10 +33,6 @@ const sdf_vs_src = `#version 300 es
         uvec4 stroke_data = texelFetch(u_stroke_data, ivec2(stroke_data_x, stroke_data_y), 0);
         float radius = float(stroke_data.w);
 
-        if (u_fixed_pixel_width > 0.0) {
-            radius = u_fixed_pixel_width / u_scale.x;
-        }
-
         vec2 pos;
 
         if (vertex_index < u_circle_points) {
@@ -88,7 +83,7 @@ const sdf_fs_src = `#version 300 es
 
     void main() {
         if (u_debug_mode == 0) {
-            float alpha = 0.5;
+            float alpha = 0.75;
             FragColor = vec4(v_color * alpha, alpha);
         } else {
             FragColor = vec4(0.2, 0.0, 0.0, 0.2);
@@ -327,10 +322,8 @@ function init_webgl(state, context) {
     gl.enable(gl.BLEND);
     gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
 
-    /*
     gl.enable(gl.DEPTH_TEST);
     gl.depthFunc(gl.NOTEQUAL);
-    */
 
     context.gpu_timer_ext = gl.getExtension('EXT_disjoint_timer_query_webgl2');
     if (context.gpu_timer_ext === null) {