structure_test.go

package assimp

/*Copyright (c) 2012 André Luiz Alves Moraes

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.*/

import (
	"math/rand"
	"reflect"
	"testing"
)

// Test the conversion between Mesh and FlatMesh
func TestFlatMesh(t *testing.T) {
	m := &Mesh{}
	// just to make sure that everything is multiple of
	// 3 (x,y,z)
	vecInfo := make([]float32, int(ByteSize/3)*3)
	normInfo := make([]float32, len(vecInfo))
	// for each triplet in vecInfo (x,y,z), include an extra value
	// to hold the alpha value
	colorInfo := make([]float32, len(vecInfo)/3*4)

	for i, ci := 0, 0; i < len(vecInfo); i, ci = i+3, ci+4 {
		for j := 0; j < 3; j++ {
			vecInfo[i+j] = rand.Float32()
			normInfo[i+j] = rand.Float32()
			colorInfo[ci+j] = rand.Float32()
			if j == 2 {
				colorInfo[ci+j+1] = 1 // alpha
			}
		}
	}

	m.Vertices = make([]Vector3, 0)
	m.Normals = make([]Vector3, 0)
	m.Colors = make([]Vector4, 0)

	for i, ci := 0, 0; i < len(vecInfo); i, ci = i+3, ci+4 {
		vec := Vector3{
			float64(vecInfo[i]),
			float64(vecInfo[i+1]),
			float64(vecInfo[i+2])}

		nor := Vector3{
			float64(normInfo[i]),
			float64(normInfo[i+1]),
			float64(normInfo[i+2])}

		col := Vector4{
			float64(colorInfo[ci]),
			float64(colorInfo[ci+1]),
			float64(colorInfo[ci+2]),
			float64(colorInfo[ci+3])}

		m.Vertices = append(m.Vertices, vec)
		m.Normals = append(m.Normals, nor)
		m.Colors = append(m.Colors, col)
	}
	m.Faces = make([]*Face, 0)

	expIdx := make([]uint32, 0)
	for i := 0; i < 100; i++ {
		f := &Face{make([]int, 3)}
		f.Indices[0] = rand.Int() % len(m.Vertices)
		f.Indices[1] = rand.Int() % len(m.Vertices)
		f.Indices[2] = rand.Int() % len(m.Vertices)

		expIdx = append(expIdx, uint32(f.Indices[0]))
		expIdx = append(expIdx, uint32(f.Indices[1]))
		expIdx = append(expIdx, uint32(f.Indices[2]))

		m.Faces = append(m.Faces, f)
	}

	fm := NewFlatMesh(m)
	if !reflect.DeepEqual(fm.Vertex, vecInfo) {
		t.Errorf("Vertex array is different")
	}
	if !reflect.DeepEqual(fm.Normal, normInfo) {
		t.Errorf("Normal array is different")
	}
	if !reflect.DeepEqual(fm.Color, colorInfo) {
		t.Errorf("Color array is different.")
		if len(fm.Color) != len(colorInfo) {
			t.Errorf("Color array have a different size")
		} else {
			for i, v := range colorInfo {
				if v != fm.Color[i] {
					t.Errorf("Difference started at index: %v", i)
					t.Errorf("Expected: %v, got %v", colorInfo[i:i+4], fm.Color[i:i+4])
					break
				}
			}
		}
	}

	if !reflect.DeepEqual(fm.Index, expIdx) {
		t.Errorf("Index array is different")
	}
}