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bge bugfix: [#18967] alpha value is never available in the color buffer by Campbell Barton (X11) and me (Win32)

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This is and old patch (June, 2009). The reason it never made into trunk it's that we (me at least) thought that
it should be optional, as a ui or command-line option.

However, it seems that OSX always have the OpenGL context with alpha enabled. So I think it's consistent to
have the other OSs to follow.

The main usage of this is the BGE (or more specifically people using BGE for TV broadcasting) but I think
pydevs can have their share of fun with it in Blender as well.
This commit is contained in:
Dalai Felinto 2013-02-22 07:37:17 +00:00
parent 4aea4c2cb3
commit 1cdaf1e329
2 changed files with 5 additions and 0 deletions
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4
intern/ghost/intern/GHOST_WindowWin32.cpp
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@ -712,6 +712,7 @@ GHOST_TSuccess GHOST_WindowWin32::initMultisample(PIXELFORMATDESCRIPTOR pfd)
WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB,
WGL_COLOR_BITS_ARB, pfd.cColorBits,
WGL_DEPTH_BITS_ARB, pfd.cDepthBits,
WGL_ALPHA_BITS_ART, pfd.cAlphaBits,
WGL_STENCIL_BITS_ARB, pfd.cStencilBits,
WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
WGL_SAMPLE_BUFFERS_ARB, GL_TRUE,
@ -1321,6 +1322,9 @@ static int WeightPixelFormat(PIXELFORMATDESCRIPTOR& pfd)
weight += pfd.cColorBits - 8;
if (pdf.cAlphaBits > 0)
weight ++;
/* want swap copy capability -- it matters a lot */
if (pfd.dwFlags & PFD_SWAP_COPY) weight += 16;

1
intern/ghost/intern/GHOST_WindowX11.cpp
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@ -213,6 +213,7 @@ GHOST_WindowX11(
attributes[i++] = GLX_BLUE_SIZE; attributes[i++] = 1;
attributes[i++] = GLX_GREEN_SIZE; attributes[i++] = 1;
attributes[i++] = GLX_DEPTH_SIZE; attributes[i++] = 1;
attributes[i++] = GLX_ALPHA_SIZE; attributes[i++] = 1;
/* GLX >= 1.4 required for multi-sample */
if (samples && (glxVersionMajor >= 1) && (glxVersionMinor >= 4)) {
attributes[i++] = GLX_SAMPLE_BUFFERS; attributes[i++] = 1;