{examples,Audio}: optimize needless setComponent calls away

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

examples/custom-renderer/App.zig

@@ -162,10 +162,10 @@ fn tick(
     var q = try entities.query(.{
         .ids = mach.Entities.Mod.read(.id),
         .followers = Mod.read(.follower),
-        .positions = Renderer.Mod.read(.position),
+        .positions = Renderer.Mod.write(.position),
     });
     while (q.next()) |v| {
-        for (v.ids, v.positions) |id, position| {
+        for (v.ids, v.positions) |id, *position| {
             // Nested query to find all the other follower entities that we should move away from.
             // We will avoid all other follower entities if we're too close to them.
             // This is not very efficient, but it works!
@@ -204,7 +204,7 @@ fn tick(
             new_position = new_position.lerp(&vec3(0, 0, 0), move_speed / avoidance_div);
 
             // Finally, update our entity position.
-            try renderer.set(id, .position, new_position);
+            position.* = new_position;
         }
     }
 

src/Audio.zig

@@ -135,37 +135,36 @@ fn audioTick(entities: *mach.Entities.Mod, audio: *Mod) !void {
 
     var did_state_change = false;
     var q = try entities.query(.{
-        .ids = mach.Entities.Mod.read(.id),
         .samples_slices = Mod.read(.samples),
         .channels = Mod.read(.channels),
-        .playings = Mod.read(.playing),
-        .indexes = Mod.read(.index),
+        .playings = Mod.write(.playing),
+        .indexes = Mod.write(.index),
     });
     while (q.next()) |v| {
-        for (v.ids, v.samples_slices, v.channels, v.playings, v.indexes) |id, samples, channels, playing, index| {
-            if (!playing) continue;
+        for (v.samples_slices, v.channels, v.playings, v.indexes) |samples, channels, *playing, *index| {
+            if (!playing.*) continue;
 
             const channels_diff = player_channels - channels + 1;
-            const to_read = @min(samples.len - index, mixing_buffer.items.len) / channels_diff;
+            const to_read = @min(samples.len - index.*, mixing_buffer.items.len) / channels_diff;
             if (channels == 1 and player_channels > 1) {
                 // Duplicate samples for mono sounds
                 var i: usize = 0;
-                for (samples[index..][0..to_read]) |sample| {
+                for (samples[index.*..][0..to_read]) |sample| {
                     mixSamplesDuplicate(mixing_buffer.items[i..][0..player_channels], sample);
                     i += player_channels;
                 }
             } else {
-                mixSamples(mixing_buffer.items[0..to_read], samples[index..][0..to_read]);
+                mixSamples(mixing_buffer.items[0..to_read], samples[index.*..][0..to_read]);
             }
 
-            if (index + to_read >= samples.len) {
+            if (index.* + to_read >= samples.len) {
                 // No longer playing, we've read all samples
                 did_state_change = true;
-                try audio.set(id, .playing, false);
-                try audio.set(id, .index, 0);
+                playing.* = false;
+                index.* = 0;
                 continue;
             }
-            try audio.set(id, .index, index + to_read);
+            index.* = index.* + to_read;
         }
     }
     if (audio.state().on_state_change) |on_state_change_event| {

src/gfx/Sprite.zig

@@ -96,6 +96,7 @@ fn updatePipeline(
         }
     }
 
+    // TODO: optimize by removing this component set call and instead use a .write() query
     try sprite_pipeline.set(pipeline_id, .num_sprites, num_sprites);
     if (num_sprites > 0) {
         encoder.writeBuffer(built.transforms, 0, gfx.SpritePipeline.cp_transforms[0..i]);

src/gfx/SpritePipeline.zig

@@ -155,6 +155,8 @@ fn buildPipeline(
     pipeline_id: mach.EntityID,
     texture: *gpu.Texture,
 ) !void {
+    // TODO: optimize by removing the component get/set calls in this function where possible
+    // and instead use .write() queries
     const opt_texture2 = sprite_pipeline.get(pipeline_id, .texture2);
     const opt_texture3 = sprite_pipeline.get(pipeline_id, .texture3);
     const opt_texture4 = sprite_pipeline.get(pipeline_id, .texture4);

src/gfx/TextPipeline.zig

@@ -179,6 +179,8 @@ fn buildPipeline(
     text_pipeline: *Mod,
     pipeline_id: mach.EntityID,
 ) !void {
+    // TODO: optimize by removing the component get/set calls in this function where possible
+    // and instead use .write() queries
     const opt_shader = text_pipeline.get(pipeline_id, .shader);
     const opt_texture_sampler = text_pipeline.get(pipeline_id, .texture_sampler);
     const opt_blend_state = text_pipeline.get(pipeline_id, .blend_state);