On 01/09/2013 11:02 AM, Eric Anholt wrote:
Jordan Justen <jordan.l.jus...@intel.com> writes:
In ES or GL+GL_ARB_ES2_compatibility, the usage of
format = IMPLEMENTATION_COLOR_READ_FORMAT +
type = IMPLEMENTATION_COLOR_READ_TYPE
can function, even if the src/dst int vs. non-int types
differ.
This seems bogus -- why should you get to read to formats that ought to
be invalid? I bet what we're missing is an implementation of this bit
of spec: "The implementation-chosen format may vary depending on the
format of the selected read buffer of the currently bound read
framebuffer." (section 4.3 of the gles3 spec) which lets us actually
specify a format that makes sense for an int framebuffer.
I think you're right. This is also why tests that try to
glReadPixels(GL_RED) from a GL_RED FBO work on other implementations but
generate an error on ours. I think we should have the
IMPLEMENTATION_COLOR_READ_* match the format / type of the FBO itself.
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