Using array format when specifying vertex attributes

[leemmon]

I was trying to specify a vertex attribute in vertex shader consisting of an array of 4 floats. Instead of vec4 I tried specifying it as array, float[4]. But I don’t seem to get the correct values with later. Is it not allowed to use array format when specifying vertex attributes?

    layout (location = 5) in float[4] v;

I guess there might be different reasons for this not working properly, just wanted to first check if this is valid in the first place.

[Alfonse_Reinheart]

You can have arrayed attributes, but each array element acts like its own attribute. So your definition of v declares 4 attributes, with attribute locations 5 to 8. I’m guessing your VAO doesn’t match that.

There’s not much reason to use an array of 4 elements as an attribute, as you can access vectors with [] syntax.

[leemmon]

I see, thanks very much! I guess I would have to specify them one by one on CPU side as well, and there’s no shorter way.

glVertexArrayAttribFormat(vao, 5, 1, GL_FLOAT, GL_FALSE, offset1);
glVertexArrayAttribFormat(vao, 6, 1, GL_FLOAT, GL_FALSE, offset2);
glVertexArrayAttribFormat(vao, 7, 1, GL_FLOAT, GL_FALSE, offset3);
glVertexArrayAttribFormat(vao, 8, 1, GL_FLOAT, GL_FALSE, offset4);

The reason I wanted to use array format, was with a macro, ex v[MAX_NUMBER]. The macro can then also be used to iterate through the vector.