Can't have a VertexSpecification!vec3f

[John-Colvin]

you get this:

../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d(215,43): Error: type float[3][0] is not an expression
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d(216,17): Error: undefined identifier 'U'
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d(78,21): Error: template instance gfm.opengl.vertex.toGLTypeAndSize!(float[3]) error instantiating
source/app.d(26,5):        instantiated from here: VertexSpecification!(Vector!(float, 3))
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Error: this for ptr needs to be type Vector not type gfm.opengl.vertex.VertexSpecification!(Vector!(float, 3))
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector._N is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Error: variable gfm.math.vector.Vector!(float, 3).Vector._N is not accessible from module vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector._T is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Error: type float is not an expression
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.isConvertible(T) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.isForeign(T) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.isValidSwizzle(string op, int lastSwizzleClass = -1) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.searchElement(char c, string s) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.hasNoDuplicates(string s) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.isValidSwizzleUnique(string op) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.swizzleIndex(char c) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.swizzleClassify(char c) is not visible from module gfm.opengl.vertex
../../../.dub/packages/gfm-6.2.0/gfm/opengl/gfm/opengl/vertex.d-mixin-65(65,18): Deprecation: gfm.math.vector.Vector!(float, 3).Vector.swizzleTuple(string op) is not visible from module gfm.opengl.vertex

[p0nce]

I think you are supposed to define a struct containing a vec3f, and instantiating VertexSpecification!ThatStruct instead.

[John-Colvin]

Sure, that's what I'm doing now, but it seems an unnecessary complication for simple cases

[p0nce]

Marked as enhancement, could be interesting indeed.

[p0nce]

Available as v6.2.3

/// A helper template to define a simple vertex type from a vector type.
/// By default the unique field will be name "position".
/// Note: it's important the struct isn't larger than the vector itself.
///
/// Example:
///     VertexSpecification!(VertexPosition!vec3f);
///
align(1) struct VertexPosition(Vec, string fieldName = "position") if (isVector!Vec)
{
    align(1):
    mixin("Vec " ~ fieldName ~ ";");
    static assert(VertexPosition.sizeof == Vec.sizeof);
}

unittest
{
   alias Test = VertexSpecification!(VertexPosition!vec3f);
}