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wasm: fix QSGContext warning message

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When runing the scenegraph example sgengine, gets rid if this error:
 QSGContext::initialize: stencil buffer support missing, expect
 rendering errors

Change-Id: I7f3a82409bc2cf81cf8217876e527f9c45be3bf4
Fixes: QTBUG-74694
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
This commit is contained in:
Lorn Potter 2019-05-20 19:53:16 +10:00
parent 800941df89
commit 9fc17c14fa
1 changed files with 14 additions and 2 deletions
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16
src/plugins/platforms/wasm/qwasmopenglcontext.cpp
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@ -37,6 +37,14 @@ QWasmOpenGLContext::QWasmOpenGLContext(const QSurfaceFormat &format)
: m_requestedFormat(format)
{
m_requestedFormat.setRenderableType(QSurfaceFormat::OpenGLES);
// if we set one, we need to set the other as well since in webgl, these are tied together
if (format.depthBufferSize() < 0 && format.stencilBufferSize() > 0)
m_requestedFormat.setDepthBufferSize(16);
if (format.stencilBufferSize() < 0 && format.depthBufferSize() > 0)
m_requestedFormat.setStencilBufferSize(8);
}
QWasmOpenGLContext::~QWasmOpenGLContext()
@ -91,10 +99,14 @@ EMSCRIPTEN_WEBGL_CONTEXT_HANDLE QWasmOpenGLContext::createEmscriptenContext(cons
attributes.majorVersion = 2;
}
// WebGL doesn't allow separate attach buffers to STENCIL_ATTACHMENT and DEPTH_ATTACHMENT
// we need both or none
bool useDepthStencil = (format.depthBufferSize() > 0 || format.stencilBufferSize() > 0);
// WebGL offers enable/disable control but not size control for these
attributes.alpha = format.alphaBufferSize() > 0;
attributes.depth = format.depthBufferSize() > 0;
attributes.stencil = format.stencilBufferSize() > 0;
attributes.depth = useDepthStencil;
attributes.stencil = useDepthStencil;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context(canvasId.toLocal8Bit().constData(), &attributes);