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EMI: Calculate the bounding box using the actor's bounding box info.

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This commit is contained in:
Joseph Jezak 2014-08-03 13:16:01 -04:00
parent 9db04e1349
commit e057c003c1
9 changed files with 211 additions and 16 deletions
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62
engines/grim/gfx_opengl_shaders.cpp
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@ -584,6 +584,68 @@ void GfxOpenGLS::getScreenBoundingBox(const EMIModel *model, int *x1, int *y1, i
*y2 = (int)(_gameHeight - top);
}
void GfxOpenGLS::getActorScreenBBox(const Actor *actor, Common::Point &p1, Common::Point &p2) {
// Get the actor's bounding box information (describes a 3D box)
Math::Vector3d bboxPos, bboxSize;
actor->getBBoxInfo(bboxPos, bboxSize);
// Translate the bounding box to the actor's position
Math::Matrix4 m = actor->getFinalMatrix();
bboxPos = bboxPos + actor->getWorldPos();
// Set up the camera coordinate system
Math::Matrix4 modelView = _currentQuat.toMatrix();
Math::Matrix4 zScale;
zScale.setValue(2, 2, -1.0);
modelView = modelView * zScale;
modelView.transpose();
modelView.translate(-_currentPos);
modelView.transpose();
// Set values outside of the screen range
p1.x = 1000;
p1.y = 1000;
p2.x = -1000;
p2.y = -1000;
// Project all of the points in the 3D bounding box
Math::Vector3d p, projected;
for (int x = 0; x < 2; x++) {
for (int y = 0; y < 2; y++) {
for (int z = 0; z < 2; z++) {
Math::Vector3d added(bboxSize.x() * 0.5f * (x * 2 - 1), bboxSize.y() * 0.5f * (y * 2 - 1), bboxSize.z() * 0.5f * (z * 2 - 1));
m.transform(&added, false);
p = bboxPos + added;
Math::Vector4d v = Math::Vector4d(p.x(), p.y(), p.z(), 1.0f);
v = _projMatrix.transform(modelView.transform(v));
if (v.w() == 0.0)
return;
v /= v.w();
double winX = (1 + v.x()) / 2.0f * _gameWidth;
double winY = (1 + v.y()) / 2.0f * _gameHeight;
// Find the points
if (winX < p1.x)
p1.x = winX;
if (winY < p1.y)
p1.y = winY;
if (winX > p2.x)
p2.x = winX;
if (winY > p2.y)
p2.y = winY;
}
}
}
// Swap the p1/p2 y coorindates
int16 tmp = p1.y;
p1.y = 480 - p2.y;
p2.y = 480 - tmp;
}
void GfxOpenGLS::startActorDraw(const Actor *actor) {
_currentActor = actor;
_actorProgram->use();