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engines/stark/scene.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "engines/stark/scene.h"
+
+#include "engines/stark/gfx/driver.h"
+#include "engines/stark/gfx/renderentry.h"
+
+#include "common/system.h"
+
+#include "math/glmath.h"
+
+namespace Stark {
+
+Scene::Scene(Gfx::Driver *gfx) :
+		_gfx(gfx),
+		_fov(45.0),
+		_nearClipPlane(100.0),
+		_farClipPlane(64000.0),
+		_fadeLevel(1.0),
+		_floatOffset(0.0),
+		_shouldRenderShadows(true),
+		_maxShadowLength(0.075f) {
+}
+
+Scene::~Scene() {
+}
+
+void Scene::initCamera(const Math::Vector3d &position, const Math::Vector3d &lookDirection,
+		float fov, Common::Rect viewSize, float nearClipPlane, float farClipPlane) {
+	_cameraPosition = position;
+	_cameraLookDirection = lookDirection;
+	_fov = fov;
+	_viewSize = viewSize;
+	_nearClipPlane = nearClipPlane;
+	_farClipPlane = farClipPlane;
+
+	_viewMatrix = Math::makeLookAtMatrix(_cameraPosition, _cameraPosition + _cameraLookDirection, Math::Vector3d(0.0, 0.0, 1.0));
+	_viewMatrix.transpose(); // Math::makeLookAtMatrix outputs transposed matrices ...
+	_viewMatrix.translate(-_cameraPosition);
+
+	setSwayAngle(0);
+	setFadeLevel(1.0);
+	setFloatOffset(0);
+}
+
+void Scene::scrollCamera(const Common::Rect &viewport) {
+	_viewport = viewport;
+
+	float xmin, xmax, ymin, ymax;
+	computeClippingRect(&xmin, &xmax, &ymin, &ymax);
+
+	// The amounts by which translate to clipping planes to account for one pixel
+	// of camera scrolling movement
+	float scollXFactor = (xmax - xmin) / _viewport.width();
+	float scollYFactor = (ymax - ymin) / _viewport.height();
+
+	int32 distanceToRight = _viewport.right - _viewSize.width();
+	int32 distanceToTop = -_viewport.top;
+
+	xmin += distanceToRight * scollXFactor;
+	xmax += distanceToRight * scollXFactor;
+	ymin += distanceToTop * scollYFactor;
+	ymax += distanceToTop * scollYFactor;
+
+	_projectionMatrix = Math::makeFrustumMatrix(xmin, xmax, ymin, ymax, _nearClipPlane, _farClipPlane);
+	_projectionMatrix.transpose(); // Math::makeFrustumMatrix outputs transposed matrices ...
+}
+
+void Scene::computeClippingRect(float *xmin, float *xmax, float *ymin, float *ymax) {
+	float aspectRatio = _viewSize.width() / (float) _viewSize.height();
+	float xmaxValue = _nearClipPlane * tan(_fov * (float)M_PI / 360.0);
+	float ymaxValue = xmaxValue / aspectRatio;
+
+	float xminValue = xmaxValue - 2 * xmaxValue * (_viewport.width() / (float) _viewSize.width());
+	float yminValue = ymaxValue - 2 * ymaxValue * (_viewport.height() / (float) _viewSize.height());
+
+	if (xmin) *xmin = xminValue;
+	if (xmax) *xmax = xmaxValue;
+	if (ymin) *ymin = yminValue;
+	if (ymax) *ymax = ymaxValue;
+}
+
+Math::Ray Scene::makeRayFromMouse(const Common::Point &mouse) const {
+	Common::Rect gameViewport = _gfx->gameViewport();
+
+	Math::Vector4d in;
+	in.x() = (mouse.x - gameViewport.left) * 2 / (float) gameViewport.width() - 1.0;
+	in.y() = (gameViewport.bottom - mouse.y) * 2 / (float) gameViewport.height() - 1.0;
+	in.z() = 1.0;
+	in.w() = 1.0;
+
+	Math::Matrix4 view = _viewMatrix;
+	view.translate(_cameraPosition);
+
+	Math::Matrix4 A = _projectionMatrix * view;
+	A.inverse();
+
+	Math::Vector4d out = A * in;
+
+	Math::Vector3d origin = _cameraPosition;
+	Math::Vector3d direction = Math::Vector3d(out.x(), out.y(), out.z());
+	direction.normalize();
+
+	return Math::Ray(origin, direction);
+}
+
+Common::Point Scene::convertPosition3DToGameScreenOriginal(const Math::Vector3d &obj) const {
+	Math::Vector4d in;
+	in.set(obj.x(), obj.y(), obj.z(), 1.0);
+
+	Math::Vector4d out = _projectionMatrix * _viewMatrix * in;
+
+	out.x() /= out.w();
+	out.y() /= out.w();
+
+	Common::Point point;
+	point.x = (1 + out.x()) * Gfx::Driver::kGameViewportWidth / 2;
+	point.y = -Gfx::Driver::kTopBorderHeight + Gfx::Driver::kOriginalHeight - (1 + out.y()) * Gfx::Driver::kGameViewportHeight / 2;
+
+	return point;
+}
+
+void Scene::setFadeLevel(float fadeLevel) {
+	_fadeLevel = fadeLevel;
+}
+
+float Scene::getFadeLevel() const {
+	return _fadeLevel;
+}
+
+void Scene::setSwayAngle(const Math::Angle &angle) {
+	_swayAngle = angle;
+}
+
+Math::Angle Scene::getSwayAngle() const {
+	return _swayAngle;
+}
+
+Math::Vector3d Scene::getSwayDirection() const {
+	// Actor sway is always along the camera direction, so that
+	// the rotation is not affected by the direction they are facing.
+	return _cameraLookDirection;
+}
+
+void Scene::setFloatOffset(float floatOffset) {
+	_floatOffset = floatOffset;
+}
+
+float Scene::getFloatOffset() const {
+	return _floatOffset;
+}
+
+void Scene::setupShadows(bool enabled, float length) {
+	_shouldRenderShadows = enabled;
+	_maxShadowLength = length;
+}
+
+} // End of namespace Stark