Can I save TD_NUM_COLOR_BUFFERS into variable ? (GLSL)

Beginners
1

Hi all,
1.Why wouldn’t it work ? (i made bold text of where I`m causing the problem)
2.There is any performance benefit to save TD_NUM_COLOR_BUFFERS into int variable if used more than one ?

[code]int bufferNum = TD_NUM_COLOR_BUFFERS;
out vec4 fragColor[bufferNum];

void main(){

fragColor[0] = vec4(vVertex.color);

for (int i = 1; i < bufferNum ;i++)

	

{
	//fragColor[i] = vec4 (1.0);

	if (i == 1 )
	{
	
	fragColor[i] = vec4(vVertex.camSpaceVert,1.0);

	}

	if (i == 2 )
	
	{
	fragColor[i] = vec4(vVertex.normal,1.0);

	}


}

}[/code]

2

In the past I’ve done it this way

out vec4 fragColor[3]; void main(){ fragColor[0] = vec4(vVertex.color); fragColor[1] = vec4(vVertex.camSpaceVert,1.0); fragColor[2] = vec4(vVertex.normal,1.0); }

As long as the number of color buffers is set to 3 on the Render TOP I think it’ll be ok.

3

Hi David thanks for the reply,
It works for me without the variable assignment,I just not sure why its not working
once I do int bufferNum = TD_NUM_COLOR_BUFFERS;

4

Does declaring it as constant work?

const int bufferNum = TD_NUM_COLOR_BUFFERS;

5

Yes!
thank you,but why ?
maybe fragColor is kind of function that behave like this ?

fragColor[const variable]
6

Ideally you’d use TD_NUM_COLOR_BUFFERS directly. This is a define and would be faster than assigning it to a variable.