AMD: DirectX Holding Back Game Performance

4:50 PM - March 18, 2011 by Kevin Parrish -
source: Bit-Tech

AMD claims that game developers actually want the API to go away.
ZoomWith all the hype surrounding DirectX 11 and how it's changing the face of PC gaming in regards to mind-blowing eye candy, AMD's worldwide developer relations manager of its GPU division, Richard Huddy, claims that developers actually want the API to go away, that it's getting in the way of creating some truly amazing graphics.
"I certainly hear this in my conversations with games developers," he told Bit-Tech in an interview. "And I guess it was actually the primary appeal of Larrabee to developers – not the hardware, which was hot and slow and unimpressive, but the software – being able to have total control over the machine, which is what the very best games developers want. By giving you access to the hardware at the very low level, you give games developers a chance to innovate, and that's going to put pressure on Microsoft – no doubt at all."
Outside a few current developers who have announced that PC game development will take priority over console versions, a good chunk of the gaming industry is developing titles for the Xbox 360 and PlayStation 3 first and then porting them over to the PC thereafter. The result is that PC versions are only slightly superior to their console counterparts on a visual sense even though a high-end graphics card has at least ten times the horsepower of the Xbox 360's Xenos GPU and the PlayStation 3's GeForce 7-series architecture.
What this means is that-- although PC graphics are better than the console version-- developers can't tap into the PC's true potential because they can't program hardware directly at a low-level, forced to work through DirectX instead. But there are benefits to working with APIs including the ability to develop a game that will run on a wide range of hardware. Developers also get access to the latest shader technologies without having to work with low-level code.
But according to Huddy, the performance overhead of DirectX is a frustrating concern for developers. "Wrapping it up in a software layer gives you safety and security," he said. "But it unfortunately tends to rob you of quite a lot of the performance, and most importantly, it robs you of the opportunity to innovate."
He added that shaders, which were introduced back in 2002, were designed to allow developers to be more innovative, to create a more visual variety in games. But now many PC games have the same kind of look and feel because developers are using shaders "to converge visually."
"If we drop the API, then people really can render everything they can imagine, not what they can see – and we'll probably see more visual innovation in that kind of situation."
The interview goes on to define the performance overhead of DirectX, explaining that the actual amount depends on the type of game in development. Huddy also talks about the possible problems of developing for a multiple GPU architecture on a low-level if the API is ignored.
"The problem with the PC is that you ideally want a PC that doesn't crash too much, and if a games developer is over-enthusiastic about the way they program direct to the metal, they can produce all sorts of difficulties for us as a hardware company trying to keep the PC stable," he said.
The interview is definitely an awesome read, so head here to get the full scoop.