/// <summary>
/// This test shows that glm.rotate() and Quaternion.ToRotationMatrix() give the same result.
/// </summary>
public static void Test()
{
using (var writer = new StreamWriter("test-quaternion.txt"))
{
int length = 5;
for (int angleDegree = 1; angleDegree < 361; angleDegree++)
{
for (int x = -length; x < length; x++)
{
for (int y = -length; y < length; y++)
{
for (int z = -length; z < length; z++)
{
var quaternion = new Quaternion(angleDegree, new vec3(x, y, z));
mat3 matrix1 = quaternion.ToRotationMatrix();
//mat4 tmp = glm.rotate((float)(angleDegree * Math.PI / 180.0f), new vec3(x, y, z));
mat4 tmp = glm.rotate(angleDegree, new vec3(x, y, z));
mat3 matrix2 = tmp.to_mat3();
writer.WriteLine("====================");
writer.WriteLine("{3}° x[{0}] y[{1}] z[{2}]", x, y, z, angleDegree);
writer.WriteLine(matrix1.ToArray().PrintVectors(3, ",", ";" + Environment.NewLine));
writer.WriteLine("------------");
writer.WriteLine(matrix2.ToArray().PrintVectors(3, ",", ";" + Environment.NewLine));
//}
}
}
}
}
writer.WriteLine("Test finished.");
}
}
public static unsafe void glusRaytraceLookAtf(this float[] positionBuffer, float[] directionBuffer, float[] originDirectionBuffer, byte padding, int width, int height, float eyeX, float eyeY, float eyeZ, float centerX, float centerY, float centerZ, float upX, float upY, float upZ)
{
//float forward[3], side[3], up[3];
//float rotation[9];
vec3 forward, side, up;
float[] rotation;
int i, k;
forward = new vec3(centerX - eyeX, centerY - eyeY, centerZ - eyeZ);
forward = forward.normalize();
up = new vec3(upX, upY, upZ);
side = forward.cross(up);
side = side.normalize();
up = side.cross(forward);
mat3 matrix = new mat3(side, up, -forward);
rotation = matrix.ToArray();
for (i = 0; i < width * height; i++)
{
positionBuffer[i * 4 + 0] = eyeX;
positionBuffer[i * 4 + 1] = eyeY;
positionBuffer[i * 4 + 2] = eyeZ;
positionBuffer[i * 4 + 3] = 1.0f;
//glusMatrix3x3MultiplyVector3f(&directionBuffer[i * (3 + padding)], rotation, &originDirectionBuffer[i * (3 + padding)]);
float[] result = new float[3];
result[0] = directionBuffer[i * (3 + padding) + 0];
result[1] = directionBuffer[i * (3 + padding) + 1];
result[2] = directionBuffer[i * (3 + padding) + 2];
float[] vector = new float[3];
vector[0] = originDirectionBuffer[i * (3 + padding) + 0];
vector[1] = originDirectionBuffer[i * (3 + padding) + 1];
vector[2] = originDirectionBuffer[i * (3 + padding) + 2];
glusMatrix3x3MultiplyVector3f(result, rotation, vector);
directionBuffer[i * (3 + padding) + 0] = result[0];
directionBuffer[i * (3 + padding) + 1] = result[1];
directionBuffer[i * (3 + padding) + 2] = result[2];
for (k = 0; k < padding; k++)
{
directionBuffer[i * (3 + padding) + 3 + k] = originDirectionBuffer[i * (3 + padding) + 3 + k];
}
}
}
/// <summary>
/// </summary>
/// <param name="uniformName"></param>
/// <param name="m"></param>
internal int glUniform(string uniformName, mat3 m)
{
int location = GetUniformLocation(uniformName);
if (location >= 0)
{
if (glUniformMatrix3fv == null)
{
glUniformMatrix3fv = GL.Instance.GetDelegateFor("glUniformMatrix3fv", GLDelegates.typeof_void_int_int_bool_floatN) as GLDelegates.void_int_int_bool_floatN;
}
float[] array = m.ToArray();
glUniformMatrix3fv(location, 1, false, array);
}
return(location);
}
/// <summary>
/// </summary>
/// <param name="uniformName"></param>
/// <param name="m"></param>
public int glUniform(string uniformName, mat3 m)
{
int location = GetUniformLocation(uniformName);
if (location >= 0)
{
if (glUniformMatrix3fv == null)
{
glUniformMatrix3fv = OpenGL.GetDelegateFor <OpenGL.glUniformMatrix3fv>();
}
float[] array = m.ToArray();
glUniformMatrix3fv(location, 1, false, array);
}
return(location);
}