topic Re: GLSL compiler rejects valid input program in Graphics

GLSL compiler rejects valid input program

ADona4 — Wed, 20 Jan 2016 23:59:51 GMT

I find that the following (valid) piece of GLSL is rejected by then Intel GLSL front-end:

# version 150

void foo() {

vec4 temp = -(mat3x4(0.0)*vec3(0.0));

}

I get this error:

ERROR: 0:4: '' : unary '-' not allowed for provided data type

Interestingly, if I rewrite the code like this:

# version 150

void foo() {

vec4 temp = (mat3x4(0.0)*vec3(0.0));

temp = -temp;

}

then it is accepted by the front end.

I have an Intel(R) HD Graphics 520 GPU, and I am running driver version 20.19.15.4326 (18/11/2015).

Can others reproduce this, and do you agree that it is a compiler bug?

Stefan3D — Thu, 21 Jan 2016 02:20:31 GMT

I can confirm that with HD5500/v4364

NVIDIA compiler accepts it (it's sloppier in general)

Try this:

vec4 temp = -1.0 * (mat3x4(0.0)*vec3(0.0));

ADona4 — Thu, 21 Jan 2016 09:45:50 GMT

Thanks for confirming that you can reproduce this.

Even if the NVIDIA compiler is sloppier in general, it seems that the Intel compiler is wrong in this instance, agreed?

Bryce__Intel — Thu, 21 Jan 2016 16:32:59 GMT

Moved discussion to Intel Developer Zone - Developing Games & Graphics on Intel