Add support for stereoscopic content in QRhi::OpenGLES2

Setting the flag QSurfaceFormat::StereoBuffers does not actually do
anything, because we do not utilize the extra buffers provided. We need
to expose setting the correct buffers using glDrawBuffers between draw
calls.

Change-Id: I6a5110405e621030ac3a2886fa83df0cfe928723
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gui/rhi/qrhi_p.h b/src/gui/rhi/qrhi_p.h
index 1d32d08e84..5ee0d6e1fd 100644
--- a/src/gui/rhi/qrhi_p.h
+++ b/src/gui/rhi/qrhi_p.h
@@ -1379,6 +1379,11 @@ public:
         HDR10
     };
 
+    enum StereoTargetBuffer {
+        LeftBuffer,
+        RightBuffer
+    };
+
     QRhiResource::Type resourceType() const override;
 
     QWindow *window() const { return m_window; }
@@ -1403,6 +1408,7 @@ public:
 
     virtual QRhiCommandBuffer *currentFrameCommandBuffer() = 0;
     virtual QRhiRenderTarget *currentFrameRenderTarget() = 0;
+    virtual QRhiRenderTarget *currentFrameRenderTarget(StereoTargetBuffer targetBuffer);
     virtual QSize surfacePixelSize() = 0;
     virtual bool isFormatSupported(Format f) = 0;
     virtual QRhiRenderPassDescriptor *newCompatibleRenderPassDescriptor() = 0;