private void _setProgramConstants_Matrix(geom.Matrix3D matrix3D, int startindex, bool transpose)
{
if (transpose)
{
matrix3D.transpose();
}
programConstants.registers[startindex] = new float4(matrix3D.M00, matrix3D.M01, matrix3D.M02, matrix3D.M03);
programConstants.registers[startindex + 1] = new float4(matrix3D.M10, matrix3D.M11, matrix3D.M12, matrix3D.M13);
programConstants.registers[startindex + 2] = new float4(matrix3D.M20, matrix3D.M21, matrix3D.M22, matrix3D.M23);
programConstants.registers[startindex + 3] = new float4(matrix3D.M30, matrix3D.M31, matrix3D.M32, matrix3D.M33);
}
public void setProgramConstantsFromMatrix(geom.Matrix3D matrix3D, int startindex, bool transpose)
{
if (startindex < ProgramConstants.USERDEFINE_STARTIDX)
{
throw new ArgumentException("之前行被保留");
}
if (transpose)
{
matrix3D.transpose();
}
programConstants.registers[startindex] = new float4(matrix3D.M00, matrix3D.M01, matrix3D.M02, matrix3D.M03);
programConstants.registers[startindex + 1] = new float4(matrix3D.M10, matrix3D.M11, matrix3D.M12, matrix3D.M13);
programConstants.registers[startindex + 2] = new float4(matrix3D.M20, matrix3D.M21, matrix3D.M22, matrix3D.M23);
programConstants.registers[startindex + 3] = new float4(matrix3D.M30, matrix3D.M31, matrix3D.M32, matrix3D.M33);
}
public static Matrix3D lookAtLH(float eyex, float eyey, float eyez,
float lookatx, float lookaty, float lookatz,
float upx, float upy, float upz)
{
// 相机UVN
//N= lookAt- eye
//U=UP * N
//V = N *U
Vector3 lookat = new Vector3(lookatx, lookaty, lookatz);
Vector3 eye = new Vector3(eyex, eyey, eyez);
Vector3 up = new Vector3(upx, upy, upz);
var N = lookat - eye;
var U = up.cross(N); //Vector3.Cross(up, N);
var V = N.cross(U); //Vector3.Cross(N, U);
N.normalize();
U.normalize();
V.normalize();
Matrix3D m1 = new Matrix3D(U.x, U.y, U.z, 0.0f,
V.x, V.y, V.z, 0.0f,
N.x, N.y, N.z, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f);
Matrix3D m2 = new Matrix3D(
1.0f, 0.0f, 0.0f, -eyex,
0.0f, 1.0f, 0.0f, -eyey,
0.0f, 0.0f, 1.0f, -eyez,
0.0f, 0.0f, 0.0f, 1.0f
);
m1.append(m2);
m1.transpose();
return(m1);
}
public static Matrix3D perspectiveOffCenterLH(float left,
float right,
float bottom,
float top,
float zNear,
float zFar)
{
float a = zFar / (zFar - zNear);
float b = -zNear * zFar / (zFar - zNear);
Matrix3D m = new Matrix3D(
2.0f * zNear / (right - left), 0.0f, (left + right) / (left - right), 0.0f,
0.0f, 2.0f * zNear / (top - bottom), (bottom + top) / (bottom - top), 0.0f,
0.0f, 0.0f, a, b,
0.0f, 0.0f, 1.0f, 0.0f
);
m.transpose();
return(m);
}
