Matthias JanetschekandClaude Opus 5.5
4826686a4d
Replace the QRhi rendering in OverlayController (private Qt API) with the render backends of the vrdashboard template (src/render/), which use public Qt API only (QQuickRenderTarget::fromOpenGLTexture / fromVulkanImage). The binary then runs on another Qt 6 patch release, e.g. the Steam Frame's system Qt. The Vulkan backend also does what SteamVR requires and the QRhi path lacked: the required instance/device extensions and the HMD's GPU (via openvr_init::renderInterop()), VK_FORMAT_R8G8B8A8_UNORM, and the transition to TRANSFER_SRC_OPTIMAL after each frame. - New option --graphics-api opengl|vulkan (default opengl, no fallback). - Shutdown() calls VR_Shutdown before the render target and Qt's device go (crash on the Steam Frame with Vulkan otherwise); it runs only once. - Mouse y is flipped on every platform: SteamVR reports it in GL convention. - Render delay 5 -> 16 ms (about 60 fps). - GuiPrivate is no longer needed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
// Adapted from the vrdashboard template (FrameAssistant commit 4a5b090),
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// verified on the Steam Frame. See docs/steamframe/DESIGN.md, section 3.
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#pragma once
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#include <QOffscreenSurface>
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#include <QOpenGLContext>
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#include "RenderBackend.h"
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class OpenGLRenderBackend final : public RenderBackend
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{
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public:
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OpenGLRenderBackend() = default;
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~OpenGLRenderBackend() override;
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QString name() const override
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{
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return QStringLiteral( "OpenGL" );
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}
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QSGRendererInterface::GraphicsApi graphicsApi() const override
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{
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return QSGRendererInterface::OpenGL;
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}
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bool initialize( const RenderInterop& interop, QString* error ) override;
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void configureWindow( QQuickWindow* window ) override;
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bool attachWindow( QQuickWindow* window, QString* error ) override;
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void detachWindow() override
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{
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releaseRenderTarget();
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}
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QString deviceName() const override
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{
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return m_deviceName;
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}
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bool makeCurrent() override;
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void doneCurrent() override;
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QQuickRenderTarget createRenderTarget( QSize size ) override;
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void releaseRenderTarget() override;
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void beginFrame() override {}
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void finishFrame() override;
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void waitForGpu() override;
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vr::Texture_t vrTexture() override;
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vr::VRTextureBounds_t vrTextureBounds() const override;
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QImage readback() override;
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private:
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std::unique_ptr<QOpenGLContext> m_context;
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std::unique_ptr<QOffscreenSurface> m_surface;
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unsigned int m_texture = 0; // GLuint
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QSize m_size;
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QString m_deviceName;
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};
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