From b2f0e59cb320ee8a7da3d180de49b345cc9bae74 Mon Sep 17 00:00:00 2001
From: aardgoose <angus.sawyer@email.com>
Date: Sun, 14 Jul 2024 17:49:36 +0100
Subject: [PATCH] wip

---
 .../webgpu/utils/WebGPUTextureUtils.js        |  4 +--
 src/renderers/webgpu/utils/WebGPUUtils.js     | 33 +++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/src/renderers/webgpu/utils/WebGPUTextureUtils.js b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
index d45b0fd4decd9f..8355fd7468fe74 100644
--- a/src/renderers/webgpu/utils/WebGPUTextureUtils.js
+++ b/src/renderers/webgpu/utils/WebGPUTextureUtils.js
@@ -113,9 +113,9 @@ class WebGPUTextureUtils {
 		const dimension = this._getDimension( texture );
 		const format = texture.internalFormat || options.format || getFormat( texture, backend.device );
 
-		const sampleCount = options.sampleCount !== undefined ? options.sampleCount : 1;
+		let sampleCount = options.sampleCount !== undefined ? options.sampleCount : 1;
 
-		// sampleCount = backend.utils.getSampleCount( sampleCount );
+		sampleCount = backend.utils.getSampleCount( sampleCount );
 
 		const primarySampleCount = texture.isRenderTargetTexture && ! texture.isMultisampleRenderTargetTexture ? 1 : sampleCount;
 
diff --git a/src/renderers/webgpu/utils/WebGPUUtils.js b/src/renderers/webgpu/utils/WebGPUUtils.js
index e1b176bff0eb93..0307b9d47cc2f8 100644
--- a/src/renderers/webgpu/utils/WebGPUUtils.js
+++ b/src/renderers/webgpu/utils/WebGPUUtils.js
@@ -64,6 +64,39 @@ class WebGPUUtils {
 
 	}
 
+	getSampleCount( sampleCount ) {
+
+		let count = 1;
+
+		if ( sampleCount > 1 ) {
+
+			// WebGPU only supports power-of-two sample counts and 2 is not a valid value
+			count = Math.pow( 2, Math.floor( Math.log2( sampleCount ) ) );
+
+			if ( count === 2 ) {
+
+				count = 4;
+
+			}
+
+		}
+
+		return count;
+
+	}
+
+	getSampleCountRenderContext( renderContext ) {
+
+		if ( renderContext.textures !== null ) {
+
+			return this.getSampleCount( renderContext.sampleCount );
+
+		}
+
+		return this.getSampleCount( this.backend.renderer.samples );
+
+	}
+
 }
 
 export default WebGPUUtils;