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0031597: Visualization, TKOpenGl - allow disabling Alpha component writes within OpenGl_Context::ColorMask()

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Added OpenGl_Caps::buffersOpaqueAlpha option allowing to disable writes
into alpha component of color buffer and keep it opaque.
Added OpenGl_Context::SetColorMaskRGBA() method overriding each color component deliberately.

New option is set within WebGL sample.
This commit is contained in:
kgv
2020-12-12 12:24:50 +03:00
committed by bugmaster
parent 465ffe2840
commit 31174e1a58
8 changed files with 66 additions and 23 deletions
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samples/webgl/WasmOcctView.cpp
View File

@@ -227,6 +227,7 @@ bool WasmOcctView::initViewer()
Handle(Aspect_DisplayConnection) aDisp;
Handle(OpenGl_GraphicDriver) aDriver = new OpenGl_GraphicDriver (aDisp, false);
aDriver->ChangeOptions().buffersNoSwap = true; // swap has no effect in WebGL
aDriver->ChangeOptions().buffersOpaqueAlpha = true; // avoid unexpected blending of canvas with page background
if (!aDriver->InitContext())
{
Message::DefaultMessenger()->Send (TCollection_AsciiString ("Error: EGL initialization failed"), Message_Fail);