From 286331c0d1d562524ff3119282f93df3afb4f779 Mon Sep 17 00:00:00 2001 From: rubbededo Date: Sun, 16 Aug 2026 01:40:58 +0000 Subject: [PATCH] Backends: WebGPU: use integer framebuffer size for viewport wgpuRenderPassEncoderSetViewport was passed FramebufferScale * DisplaySize in float, which can round one ULP above the render target size during resizing and trigger a wgpu validation error. Cast to int so the viewport stays inside the target. Fixes #8628. --- backends/imgui_impl_wgpu.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/backends/imgui_impl_wgpu.cpp b/backends/imgui_impl_wgpu.cpp index ce5974b41..560acb052 100644 --- a/backends/imgui_impl_wgpu.cpp +++ b/backends/imgui_impl_wgpu.cpp @@ -440,7 +440,7 @@ static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPas } // Setup viewport - wgpuRenderPassEncoderSetViewport(ctx, 0, 0, draw_data->FramebufferScale.x * draw_data->DisplaySize.x, draw_data->FramebufferScale.y * draw_data->DisplaySize.y, 0, 1); + wgpuRenderPassEncoderSetViewport(ctx, 0, 0, (float)(int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x), (float)(int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y), 0, 1); // Bind shader and vertex buffers wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, fr->VertexBufferSize * sizeof(ImDrawVert));