/// Adds a texture parameter + uniform to the specified material.
/// As a side effect, auto-creates textures, images, and maybe a sampler if necessary.
/// Pass:
/// matObjName - the material
/// texParam - name of the material parameter to add
/// fileRef - file containing texture data
public void AddTextureToMaterial(
IExportableMaterial exportableMaterial, string texParam, ExportFileReference fileRef)
{
GlTF_Material material = G.materials[exportableMaterial];
GlTF_Sampler sampler = GlTF_Sampler.LookupOrCreate(
G, GlTF_Sampler.MagFilter.LINEAR, GlTF_Sampler.MinFilter.LINEAR_MIPMAP_LINEAR);
// The names only matter for gltf1, so keep them similar for easier diffing.
// Essentially, this names the image and texture after the first material that wanted them.
string matNameAndParam = $"{exportableMaterial.UniqueName:D}_{texParam}";
var img = GlTF_Image.LookupOrCreate(G, fileRef, proposedName: matNameAndParam);
var tex = GlTF_Texture.LookupOrCreate(G, img, sampler, proposedName: matNameAndParam);
material.values.Add(new GlTF_Material.TextureKV(key: texParam, texture: tex));
// Add texture-related parameter and uniform.
AddUniform(exportableMaterial,
texParam, GlTF_Technique.Type.SAMPLER_2D, GlTF_Technique.Semantic.UNKNOWN, null);
}
