From: John Tsiombikas <nuclear@member.fsf.org>
Date: Sun, 14 Jan 2018 03:44:05 +0000 (+0200)
Subject: select and move exhibits
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=laserbrain_demo;a=commitdiff_plain;h=b5ed5107e21ff834d5a4510b9047f976abb03dff;hp=ebbb52cd0de8e27817a0770bd7bdb48a58348a02

select and move exhibits
---

diff --git a/src/app.cc b/src/app.cc
index 25c59b3..59d713c 100644
--- a/src/app.cc
+++ b/src/app.cc
@@ -72,7 +72,7 @@ static ExhibitManager *exman;
 static BlobExhibit *blobs;
 static bool show_blobs;
 
-static ExSelection ex_sel;
+ExSelection exsel_grab, exsel_hover;
 
 static Renderer *rend;
 
@@ -343,6 +343,13 @@ static void update(float dt)
 	mouse_view_matrix.pre_rotate_y(deg_to_rad(avatar.body_rot));
 	mouse_view_matrix.pre_translate(-avatar.pos.x, -avatar.pos.y, -avatar.pos.z);
 
+	// check if an exhibit is hovered-over by mouse or 6dof
+	// XXX note: using previous view/proj matrix lattency shouldn't be an issue but
+	//           make sure state-creep doesn't get us
+	// XXX also this mouse-picking probably should only be active in non-VR mode
+	Ray ray = calc_pick_ray(prev_mx, prev_my);
+	exsel_hover = exman->select(ray);
+
 	// update hand-tracking
 	if(have_handtracking) {
 		update_vrhands(&avatar);
@@ -605,11 +612,11 @@ void app_mouse_button(int bn, bool pressed, int x, int y)
 
 	if(bn == 0) {
 		if(!pressed) {
-			if(ex_sel.ex) {
-				ex_sel.ex = 0;
+			if(exsel_grab.ex) {
+				exsel_grab.ex = 0;
 			} else {
 				Ray ray = calc_pick_ray(x, y);
-				ex_sel = exman->select(ray);
+				exsel_grab = exman->select(ray);
 			}
 		}
 	}
@@ -645,11 +652,11 @@ void app_mouse_motion(int x, int y)
 
 	if(!dx && !dy) return;
 
-	if(ex_sel.ex) {
-		Vec3 pos = ex_sel.ex->node->get_node_position();
+	if(exsel_grab.ex) {
+		Vec3 pos = exsel_grab.ex->node->get_node_position();
 		Vec3 dir = transpose(view_matrix.upper3x3()) * Vec3(dx * 1.0, dy * -1.0, 0);
 
-		ex_sel.ex->node->set_position(pos + dir);
+		exsel_grab.ex->node->set_position(pos + dir);
 	}
 
 	if(bnstate[2]) {
diff --git a/src/app.h b/src/app.h
index fe06daf..1eed2fe 100644
--- a/src/app.h
+++ b/src/app.h
@@ -3,6 +3,7 @@
 
 #include "texture.h"
 #include "scene.h"
+#include "exhibit.h"
 
 extern long time_msec;
 extern int win_width, win_height;
@@ -15,6 +16,8 @@ extern SceneSet sceneman;
 
 extern unsigned int sdr_ltmap, sdr_ltmap_notex;
 
+extern ExSelection exsel_grab, exsel_hover;
+
 extern int fpexcept_enabled;	// int so that C modules may fwd-delcare and use it
 
 enum {
diff --git a/src/exhibit.cc b/src/exhibit.cc
index b8d44cc..266a583 100644
--- a/src/exhibit.cc
+++ b/src/exhibit.cc
@@ -2,6 +2,7 @@
 #include "snode.h"
 #include "scene.h"
 #include "geomdraw.h"
+#include "app.h"
 
 class ExhibitPriv {
 public:
@@ -63,12 +64,20 @@ void Exhibit::set_node(SceneNode *node)
 
 ExSelection Exhibit::select(const Ray &ray) const
 {
-	return ExSelection(0);
+	ExSelection sel;
+	HitPoint hit;
+	if(get_aabox().intersect(ray, &hit)) {
+		sel.ex = (Exhibit*)this;
+		sel.selray = ray;
+		sel.dist = hit.dist;
+		sel.validmask = EXSEL_RAY;
+	}
+	return sel;
 }
 
 ExSelection Exhibit::select(const Sphere &sph) const
 {
-	return ExSelection(0);
+	return ExSelection(0);	// TODO
 }
 
 void Exhibit::update(float dt)
@@ -94,8 +103,10 @@ void Exhibit::post_draw() const
 		glMatrixMode(GL_MODELVIEW);
 		glPopMatrix();
 
-		const AABox &bvol = get_aabox();
-		draw_geom_object(&bvol);
+		if(exsel_hover.ex == this) {
+			const AABox &bvol = get_aabox();
+			draw_geom_object(&bvol);
+		}
 	}
 }
 
diff --git a/src/exhibit.h b/src/exhibit.h
index f2c521b..f331d99 100644
--- a/src/exhibit.h
+++ b/src/exhibit.h
@@ -23,6 +23,7 @@ public:
 	void *data;
 	Ray selray;
 	Sphere selsphere;
+	float dist;
 	unsigned int validmask;
 
 	ExSelection(Exhibit *ex = 0);
diff --git a/src/exman.cc b/src/exman.cc
index 6517b65..21e0074 100644
--- a/src/exman.cc
+++ b/src/exman.cc
@@ -1,3 +1,4 @@
+#include <float.h>
 #include <algorithm>
 #include "exman.h"
 #include "exhibit.h"
@@ -103,13 +104,18 @@ bool ExhibitManager::load(MetaScene *mscn, const char *fname)
 
 ExSelection ExhibitManager::select(const Ray &ray) const
 {
-	ExSelection sel;
-	if(!items.empty()) {
-		sel.ex = items[0];
-		sel.selray = ray;
-		sel.validmask = EXSEL_RAY;
+	ExSelection nearest;
+	nearest.dist = FLT_MAX;
+
+	int nitems = items.size();
+	for(int i=0; i<nitems; i++) {
+		ExSelection sel = items[i]->select(ray);
+		if(sel && sel.dist < nearest.dist) {
+			nearest = sel;
+		}
 	}
-	return sel;	// TODO
+
+	return nearest;
 }
 
 ExSelection ExhibitManager::select(const Sphere &sph) const