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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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27
src/OpenGl/OpenGl_View_Redraw.cxx
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@@ -922,20 +922,17 @@ void OpenGl_View::redraw (const Graphic3d_Camera::Projection theProjection,
myWorkspace->UseZBuffer() = Standard_True;
myWorkspace->UseDepthWrite() = Standard_True;
GLbitfield toClear = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
glDepthFunc (GL_LEQUAL);
glDepthMask (GL_TRUE);
glEnable (GL_DEPTH_TEST);
aCtx->core11fwd->glDepthFunc (GL_LEQUAL);
aCtx->core11fwd->glDepthMask (GL_TRUE);
aCtx->core11fwd->glEnable (GL_DEPTH_TEST);
#if !defined(GL_ES_VERSION_2_0)
glClearDepth (1.0);
#else
glClearDepthf (1.0f);
#endif
aCtx->core11fwd->glClearDepth (1.0);
const OpenGl_Vec4 aBgColor = aCtx->Vec4FromQuantityColor (myBgColor);
glClearColor (aBgColor.r(), aBgColor.g(), aBgColor.b(), 0.0f);
glClear (toClear);
aCtx->SetColorMaskRGBA (NCollection_Vec4<bool> (true)); // force writes into all components, including alpha
aCtx->core11fwd->glClearColor (aBgColor.r(), aBgColor.g(), aBgColor.b(), aCtx->caps->buffersOpaqueAlpha ? 1.0f : 0.0f);
aCtx->core11fwd->glClear (toClear);
aCtx->SetColorMask (true); // restore default alpha component write state
render (theProjection, theReadDrawFbo, theOitAccumFbo, Standard_False);
}
@@ -1487,12 +1484,10 @@ bool OpenGl_View::blitBuffers (OpenGl_FrameBuffer* theReadFbo,
const Standard_Integer aViewport[4] = { 0, 0, aDrawSizeX, aDrawSizeY };
aCtx->ResizeViewport (aViewport);
#if !defined(GL_ES_VERSION_2_0)
aCtx->core20fwd->glClearDepth (1.0);
#else
aCtx->core20fwd->glClearDepthf (1.0f);
#endif
aCtx->SetColorMaskRGBA (NCollection_Vec4<bool> (true)); // force writes into all components, including alpha
aCtx->core20fwd->glClearDepth (1.0);
aCtx->core20fwd->glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
aCtx->SetColorMask (true); // restore default alpha component write state
const bool toApplyGamma = aCtx->ToRenderSRGB() != aCtx->IsFrameBufferSRGB();
if (aCtx->arbFBOBlit != NULL