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Smaller footprint, and simplifies refactoring.
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The cmake CMakeLists.txt file has logic for including or excluding certain
compilation units based on the platform: Windows, Linux or Mac OS X.
Other build systems are not as clever, it is convenient to also wrap
platform-specifics with #ifdef _WIN32 ... #endif to keep things simple on
the build side.
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Getting the dimension / format of EGL images is not straitghforward.
One way to get these would be through glGetTexLevelParameter, but it's
not supported by GLES. Another way is to attach the EGL image to a
renderbuffer and call glGetRenderbufferParameter on it, but at least
mesa doesn't support attaching images in RGBA_REV format. And that
format happens to be an important one in applications we care about
(like the Android browser). We could also check the parameters of the
underlying native buffer, but these are not exposed through any API (for
either Xpixmaps or Android native buffers)
So the only way I found is to try a non-destructive glCopyTexSubImage2D
with sizes starting from GL_MAX_TEXTURE_SIZE down to 1 and determine the
correct size based on whether this returns an error or not.
Signed-off-by: Imre Deak <imre.deak@intel.com>
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