#include "camera.hpp"
#include "std.hpp"

extern gxScene* gx_scene;

Camera::Camera()
{
	setZoom(1);
	setRange(1, 1000);
	setViewport(0, 0, 0, 0);
	setClsColor(Vector());
	setClsMode(true, true);
	setProjMode(PROJ_PERSP);
	setFogRange(1, 1000);
	setFogColor(Vector());
	setFogMode(gxScene::FOG_NONE);
}

void Camera::setZoom(float z)
{
	zoom        = z;
	local_valid = false;
}

void Camera::setRange(float n, float f)
{
	frustum_nr  = n;
	frustum_fr  = f;
	local_valid = false;
}

void Camera::setViewport(int x, int y, int w, int h)
{
	vp_x        = x;
	vp_y        = y;
	vp_w        = w;
	vp_h        = h;
	local_valid = false;
}

void Camera::setClsColor(const Vector& v)
{
	cls_color = v;
}

void Camera::setClsMode(bool c, bool z)
{
	cls_argb = c;
	cls_z    = z;
}

void Camera::setProjMode(int mode)
{
	proj_mode = mode;
}

void Camera::setFogColor(const Vector& v)
{
	fog_color = v;
}

void Camera::setFogRange(float nr, float fr)
{
	fog_nr = nr;
	fog_fr = fr;
}

void Camera::setFogMode(int mode)
{
	fog_mode = mode;
}

const Frustum& Camera::getFrustum() const
{
	if (!local_valid) {
		float ar  = (float)vp_h / vp_w;
		frustum_w = frustum_nr * 2 / zoom;
		frustum_h = frustum_nr * 2 / zoom * ar;
		new (&local_frustum) Frustum(frustum_nr, frustum_fr, frustum_w, frustum_h);
		local_valid = true;
	}
	return local_frustum;
}

float Camera::getFrustumNear() const
{
	return frustum_nr;
}

float Camera::getFrustumFar() const
{
	return frustum_fr;
}

float Camera::getFrustumWidth() const
{
	getFrustum();
	return frustum_w;
}

float Camera::getFrustumHeight() const
{
	getFrustum();
	return frustum_h;
}

void Camera::getViewport(int* x, int* y, int* w, int* h) const
{
	*x = vp_x;
	*y = vp_y;
	*w = vp_w;
	*h = vp_h;
}

bool Camera::beginRenderFrame()
{
	if (!proj_mode)
		return false;
	getFrustum();
	gx_scene->setViewport(vp_x, vp_y, vp_w, vp_h);
	gx_scene->clear(&(cls_color.x), 1, 1, cls_argb, cls_z);
	if (proj_mode == PROJ_ORTHO) {
		gx_scene->setOrthoProj(frustum_nr, frustum_fr, frustum_w, frustum_h);
	} else {
		gx_scene->setPerspProj(frustum_nr, frustum_fr, frustum_w, frustum_h);
	}
	gx_scene->setFogRange(fog_nr, fog_fr);
	gx_scene->setFogColor((float*)&fog_color.x);
	gx_scene->setFogMode(fog_mode);
	return true;
}