public static void rotate(float angle, Vertex3f axis, Matrix4f src, ref Matrix4f dest)
{
Matrix4f rotationMatrix = new Matrix4f();
rotationMatrix.SetIdentity();
float[] matbuffer = rotationMatrix.Buffer;
if (axis.x != 0)
{
matbuffer[5] = (float)Math.Cos(angle);
matbuffer[6] = (float)-Math.Sin(angle);
matbuffer[9] = (float)Math.Sin(angle);
matbuffer[10] = (float)Math.Cos(angle);
}
else if (axis.y != 0)
{
matbuffer[0] = (float)Math.Cos(angle);
matbuffer[2] = (float)Math.Sin(angle);
matbuffer[8] = (float)-Math.Sin(angle);
matbuffer[10] = (float)Math.Cos(angle);
}
else if (axis.z != 0)
{
matbuffer[0] = (float)Math.Cos(angle);
matbuffer[1] = (float)-Math.Sin(angle);
matbuffer[4] = (float)Math.Sin(angle);
matbuffer[5] = (float)Math.Cos(angle);
}
// apply rotation to src matrix
Matrix tempmat = (Matrix) new Matrix(matbuffer, 4, 4).Multiply(src);
// set dest matrix to the rotated matrix
dest = new Matrix4f(tempmat.Buffer);
}
public static void scale(Vertex3f vector, Matrix4f src, ref Matrix4f dest)
{
Matrix4f scalerMatrix = new Matrix4f();
scalerMatrix.SetIdentity();
float[] matbuffer = scalerMatrix.Buffer;
matbuffer[0] = vector.x;
matbuffer[5] = vector.y;
matbuffer[10] = vector.z;
Matrix tempmat = (Matrix) new Matrix(matbuffer, 4, 4).Multiply(src);
dest = new Matrix4f(tempmat.Buffer);
}
public static void translate(Vertex3f translation, Matrix4f src, out Matrix4f des)
{
Matrix4f translationMatrix = new Matrix4f();
translationMatrix.SetIdentity();
float[] matbuffer = translationMatrix.Buffer;
matbuffer[12] = translation.x;
matbuffer[13] = translation.y;
matbuffer[14] = translation.z;
Matrix tempmat = (Matrix) new Matrix(matbuffer, 4, 4).Multiply(src);
des = new Matrix4f(tempmat.Buffer);
}
private void createProjectionMatrix()
{
float aspectRatio = (float)window.windowWidth / window.windowHeight;
float y_scale = 1f / (float)Math.Tan(math.toRadians(FOV / 2f));
float x_scale = y_scale / aspectRatio;
float frustum_length = FAR_PLANE - NEAR_PLANE;
float[] matbuffer = projectionMatrix.Buffer;
matbuffer[0] = x_scale;
matbuffer[5] = y_scale;
matbuffer[10] = -((FAR_PLANE + NEAR_PLANE) / frustum_length);
matbuffer[11] = -1;
matbuffer[14] = -((2 * NEAR_PLANE * FAR_PLANE) / frustum_length);
matbuffer[15] = 0;
this.projectionMatrix = new Matrix4f(matbuffer);
}
public void render(Entity entity, StaticShader shader)
{
TexturedModel model = entity.model;
RawModel rawModel = model.rawModel;
Gl.BindVertexArray(rawModel.vaoID);
Gl.EnableVertexAttribArray(0);
Gl.EnableVertexAttribArray(1);
Matrix4f transformationMatrix = Maths.createTransformationMatrix(entity.position, entity.rotX, entity.rotY, entity.rotZ, entity.scale);
shader.loadTransformationMatrix(transformationMatrix);
Gl.ActiveTexture(TextureUnit.Texture0);
Gl.BindTexture(TextureTarget.Texture2d, model.modelTexture.textureId);
Gl.DrawElements(PrimitiveType.Triangles, rawModel.vertexCount, DrawElementsType.UnsignedInt, IntPtr.Zero);
Gl.DisableVertexAttribArray(0);
Gl.DisableVertexAttribArray(1);
Gl.BindVertexArray(0);
}
protected void loadMatrix(int location, Matrix4f matrix)
{
Gl.UniformMatrix4(location, false, matrix.Buffer);
}
public void loadViewMatrix(Camera camera)
{
Matrix4f viewMatrix = Maths.createViewMatrix(camera);
base.loadMatrix(location_viewMatrix, viewMatrix);
}
public void loadProjectionMatrix(Matrix4f projection)
{
base.loadMatrix(location_projectionMatrix, projection);
}
public void loadTransformationMatrix(Matrix4f matrix)
{
base.loadMatrix(location_transformationMatrix, matrix);
}