From a523dd41c8cd9be8f75c870819545cea9cd2c5e0 Mon Sep 17 00:00:00 2001
From: Jaswant Panchumarti <jaswant.panchumarti@kitware.com>
Date: Fri, 21 Feb 2025 14:21:17 -0500
Subject: [PATCH] Clear the ids attachment in vtkWebGPURenderer::Clear
- This commit adds an additional Ids attachment to the render pass and updates the shader program which renders the "background" color to zero-initialize the Ids attachment
---
Rendering/WebGPU/vtkWebGPURenderer.cxx | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/Rendering/WebGPU/vtkWebGPURenderer.cxx b/Rendering/WebGPU/vtkWebGPURenderer.cxx
index 60e6b369cb8..713af05a835 100644
--- a/Rendering/WebGPU/vtkWebGPURenderer.cxx
+++ b/Rendering/WebGPU/vtkWebGPURenderer.cxx
@@ -53,13 +53,15 @@ const char* backgroundShaderSource = R"(
@builtin(position) position: vec4<f32>
};
struct FragmentOutput {
- @location(0) color: vec4<f32>
+ @location(0) color: vec4<f32>,
+ @location(1) ids: vec4<u32>,
};
@fragment
fn fragmentMain() -> FragmentOutput {
var output: FragmentOutput;
output.color = vec4<f32>(1, 1, 1, 1);
+ output.ids = vec4<u32>(0u);
return output;
}
)";
@@ -207,6 +209,11 @@ void vtkWebGPURenderer::Clear()
blendState->alpha.dstFactor = wgpu::BlendFactor::Zero;
}
}
+ // Prepare selection ids output.
+ bkgPipelineDescriptor.cTargets[1].format =
+ wgpuRenderWindow->GetPreferredSelectorIdsTextureFormat();
+ bkgPipelineDescriptor.cFragment.targetCount++;
+ bkgPipelineDescriptor.DisableBlending(1);
const auto pipelineKey =
wgpuPipelineCache->GetPipelineKey(&bkgPipelineDescriptor, backgroundShaderSource);
wgpuPipelineCache->CreateRenderPipeline(&bkgPipelineDescriptor, this, backgroundShaderSource);
@@ -250,7 +257,8 @@ void vtkWebGPURenderer::RecordRenderCommands()
if (auto* wgpuRenderWindow = vtkWebGPURenderWindow::SafeDownCast(this->RenderWindow))
{
vtkWebGPURenderPassDescriptorInternals renderPassDescriptor(
- { wgpuRenderWindow->GetOffscreenColorAttachmentView() },
+ { wgpuRenderWindow->GetOffscreenColorAttachmentView(),
+ wgpuRenderWindow->GetHardwareSelectorAttachmentView() },
wgpuRenderWindow->GetDepthStencilView(),
/*clearColor=*/false, /*clearDepth=*/false, /*clearStencil=*/false);
renderPassDescriptor.label = "vtkWebGPURenderer::RecordRenderCommands";
--
GitLab