/* \brief calcualate view matrix */
static void _glhckCameraViewMatrix(glhckCamera *object)
{
kmMat4 rotation, tmp;
kmVec3 upvector;
CALL(2, "%p", object);
assert(object);
/* build rotation for upvector */
kmMat4RotationAxisAngle(&rotation, &(kmVec3){0,0,1},
kmDegreesToRadians(object->object->view.rotation.z));
kmMat4RotationAxisAngle(&tmp, &(kmVec3){0,1,0},
kmDegreesToRadians(object->object->view.rotation.y));
kmMat4Multiply(&rotation, &rotation, &tmp);
kmMat4RotationAxisAngle(&tmp, &(kmVec3){1,0,0},
kmDegreesToRadians(object->object->view.rotation.x));
kmMat4Multiply(&rotation, &rotation, &tmp);
/* assuming upvector is normalized */
kmVec3Transform(&upvector, &object->view.upVector, &rotation);
/* build view matrix */
kmMat4LookAt(&object->view.view, &object->object->view.translation,
&object->object->view.target, &upvector);
kmMat4Multiply(&object->view.viewProj,
&object->view.projection, &object->view.view);
glhckFrustumBuild(&object->frustum, &object->view.viewProj);
}
void kmGLRotatef(float angle, float x, float y, float z)
{
kmVec3 axis;
kmMat4 rotation;
//Create an axis vector
kmVec3Fill(&axis, x, y, z);
//Create a rotation matrix using the axis and the angle
kmMat4RotationAxisAngle(&rotation, &axis, kmDegreesToRadians(angle));
//Multiply the rotation matrix by the current matrix
kmMat4Multiply(current_stack->top, current_stack->top, &rotation);
}
void kmGLRotatef(float angle, float x, float y, float z)
{
km_mat4_stack_context *current_context = (km_mat4_stack_context *)pthread_getspecific(current_context_key);
kmVec3 axis;
kmMat4 rotation;
/*Create an axis vector*/
kmVec3Fill(&axis, x, y, z);
/*Create a rotation matrix using the axis and the angle*/
kmMat4RotationAxisAngle(&rotation, &axis, kmDegreesToRadians(angle));
/*Multiply the rotation matrix by the current matrix*/
kmMat4Multiply(current_context->current_stack->top, current_context->current_stack->top, &rotation);
}
