Micro-optimize wgpu_command_encoder_begin_render_pass() to avoid an o…

…bject
yudonghai200 · Jun 28, 2021 · 2038086 · 2038086
1 parent 9be14f0
commit 2038086
Showing 1 changed file with 5 additions and 6 deletions.
diff --git a/lib/lib_webgpu.js b/lib/lib_webgpu.js
@@ -741,21 +741,20 @@ mergeInto(LibraryManager.library, {
     var colorAttachments = [];
     var numColorAttachments = HEAP32[descriptor++];
     var colorAttachmentsIdx = HEAPU32[descriptor++] >> 2;
+    var colorAttachmentsIdxDbl = colorAttachmentsIdx + 4 >> 1; // Alias the view for HEAPF64.
     {{{ wassert('colorAttachmentsIdx % 2 == 0'); }}} // Must be aligned at double boundary
     while(numColorAttachments--) {
       colorAttachments.push({
         'view': wgpu[HEAPU32[colorAttachmentsIdx]],
         'resolveTarget': wgpu[HEAPU32[colorAttachmentsIdx+1]],
         'storeOp': _wgpuStrings[HEAPU32[colorAttachmentsIdx+2]],
-        'loadValue': _wgpuStrings[HEAPU32[colorAttachmentsIdx+3]] || {
-          'r': HEAPF64[colorAttachmentsIdx+4>>1],
-          'g': HEAPF64[colorAttachmentsIdx+6>>1],
-          'b': HEAPF64[colorAttachmentsIdx+8>>1],
-          'a': HEAPF64[colorAttachmentsIdx+10>>1],
-        }
+        'loadValue': _wgpuStrings[HEAPU32[colorAttachmentsIdx+3]] ||
+          [HEAPF64[colorAttachmentsIdxDbl  ], HEAPF64[colorAttachmentsIdxDbl+1],
+           HEAPF64[colorAttachmentsIdxDbl+2], HEAPF64[colorAttachmentsIdxDbl+3]]
       });
 
       colorAttachmentsIdx += 12;
+      colorAttachmentsIdxDbl += 6;
     }
 
     var depthStencilView = wgpu[HEAPU32[descriptor]];