(01-01-2014, 08:21 AM)DragonNeos Wrote: One of the reasons that JPCSP doesn't perform well on AMD GPUs is because of poor drivers. Nvidia seems to have better OpenGL support for their GPU in comparison to AMD's GPU.
Is there any fundamental differences between the two Software Rendering options? Doesn't both options use the CPU for graphics rendering and why are they called Internal and External Software Rendering respectively?
Yeah, sadly AMD shader tends to compile ok whereas it shouldn't. It's a nightmare.
Yes, both use CPU. The internal software renderer is done in Java inside JPCSP source, hence "internal" : it's the original software renderer of JPCSP. The external software renderer is a dll because it's written "from the scratch"* in C++. It uses more and more SIMD instructions (SSE2, SSE4.1 and AVX2 in future) through intrinsics functions or run-time generated code through a dynamic compiler. It is at a stage we can play games with it but it remains a work in progress as we try to improve both compliance and speediness of it. As a fact, gid15 and I join our effort to make a software renderer.
*: not exactly as part of it is originally based on my OpenGL-GE source from pspe4all.