On Tuesday, September 09, 2014 10:30:16 AM Ian Romanick wrote: > On 09/08/2014 01:10 AM, Tapani Pälli wrote: > > From: Kalyan Kondapally <kalyan.kondapa...@intel.com> > > > > According to GLSL-ES Spec(i.e. 1.0, 3.0), gl_Position value is undefined > > after the vertex processing stage if we don't write gl_Position. However, > > GLSL 1.10 Spec mentions that writing to gl_Position is mandatory. In case > > of GLSL-ES, it's not an error and atleast the linking should pass. > > Currently, Mesa throws an linker error in case we dont write to gl_position > > and Version is less then 140(GLSL) and 300(GLSL-ES). This patch changes > > it so that we don't report an error in case of GLSL-ES. > > Wow. We can add this to the list of ways OpenGL ES is just plain > broken. Since there is absolutely NO WAY this shader can produce any > useful results, we should at least do the courtesy of generating a > warning. So, keep the first if-condistion the same, but do > linker_warning instead of linker_error if prog->IsES.
I like that idea. But what about 1.40 or 1.50? I'm having a hard time imagining how 1.40 would let you produce any useful results, either (so maybe we should issue a warning there too). With 1.50, you at least have geometry shaders, so you can produce real output later... --Ken
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