# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1335206590 -10800
# Node ID 2723dc026c4f7772262d236c3021f54ea9179a82
# Parent  aab0d8ea21cdeeeda1e91fc95ca51220a1476c87
collision detection

diff -r aab0d8ea21cd -r 2723dc026c4f Makefile
--- a/Makefile	Sun Apr 22 06:26:08 2012 +0300
+++ b/Makefile	Mon Apr 23 21:43:10 2012 +0300
@@ -9,6 +9,8 @@
 LDFLAGS = -L/usr/local/lib $(add_lib) $(libgl) $(libal) -lm -lvmath -limago
 
 ifeq ($(shell uname -s), Darwin)
+	CC = clang
+	CXX = clang++
 	libgl = -framework OpenGL -framework GLUT -lGLEW
 	add_inc += -I/opt/local/include
 	add_lib += -L/opt/local/lib
diff -r aab0d8ea21cd -r 2723dc026c4f sdr/vein.p.glsl
--- a/sdr/vein.p.glsl	Sun Apr 22 06:26:08 2012 +0300
+++ b/sdr/vein.p.glsl	Mon Apr 23 21:43:10 2012 +0300
@@ -1,7 +1,7 @@
 uniform sampler2D tex_norm;
 uniform vec3 fog_col;
 
-varying vec3 vpos, vnorm;
+varying vec3 vpos;
 varying vec3 ldir, vdir;
 
 const float fog_dens = 0.075;
@@ -13,7 +13,7 @@
 	vec3 tnorm = texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0;
 	vec3 n = normalize(tnorm);
 	vec3 v = normalize(vdir);
-	vec3 l = v;//normalize(ldir);
+	vec3 l = normalize(ldir);
 	vec3 h = normalize(l + v);
 
 	vec3 diff = vec3(0.8, 0.25, 0.2) * (1.0 - max(dot(l, n), 0.0));
diff -r aab0d8ea21cd -r 2723dc026c4f sdr/vein.v.glsl
--- a/sdr/vein.v.glsl	Sun Apr 22 06:26:08 2012 +0300
+++ b/sdr/vein.v.glsl	Mon Apr 23 21:43:10 2012 +0300
@@ -1,6 +1,6 @@
 attribute vec3 attr_tang;
 
-varying vec3 vpos, vnorm;
+varying vec3 vpos;
 varying vec3 ldir, vdir;
 
 void main()
@@ -18,9 +18,8 @@
 			t.x, b.x, n.x,
 			t.y, b.y, n.y,
 			t.z, b.z, n.z);
-	ldir = tbn_mat * (gl_LightSource[0].position.xyz - vpos);
+	ldir = tbn_mat * vec3(0, 0, 1);
 	vdir = tbn_mat * -vpos;
-	vnorm = n;
 
 	gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
 }
diff -r aab0d8ea21cd -r 2723dc026c4f src/game.cc
--- a/src/game.cc	Sun Apr 22 06:26:08 2012 +0300
+++ b/src/game.cc	Mon Apr 23 21:43:10 2012 +0300
@@ -6,10 +6,10 @@
 #include "camera.h"
 #include "cockpit.h"
 
-static const Vector3 fog_color{0.64, 0.1, 0.1};
+static const Vector3 fog_color(0.64, 0.1, 0.1);
 
 static Vein *vein;
-static Ship ship;
+static Ship *ship;
 
 static int keystate[256];
 static int dbg_inside = false;
@@ -39,6 +39,9 @@
 	}
 	vein->set_fog_color(fog_color);
 
+	// create the player's ship
+	ship = new Ship(vein);
+
 	glClearColor(fog_color.x, fog_color.y, fog_color.z, 1);
 
 	return true;
@@ -64,25 +67,19 @@
 
 	// handle key input
 	if(keystate['w'] || keystate['W']) {
-		ship.accelerate(1.0 * dt);
+		ship->accelerate(1.0 * dt);
 	}
 	if(keystate['s'] || keystate['S']) {
-		ship.accelerate(-1.0 * dt);
+		ship->accelerate(-1.0 * dt);
 	}
 	if(keystate['d'] || keystate['D']) {
-		ship.accelerate_side(1.0 * dt);
+		ship->accelerate_side(1.0 * dt);
 	}
 	if(keystate['a'] || keystate['A']) {
-		ship.accelerate_side(-1.0 * dt);
+		ship->accelerate_side(-1.0 * dt);
 	}
-	/*if(keystate['e'] || keystate['E']) {
-		ship.turn(0.0, 1.0 * dt);
-	}
-	if(keystate['c'] || keystate['C']) {
-		ship.turn(0.0, -1.0 * dt);
-	}*/
 
-	ship.update(dt);
+	ship->update(dt);
 
 	last_upd = msec;
 }
@@ -92,15 +89,15 @@
 	glMatrixMode(GL_MODELVIEW);
 
 	if(dbg_inside) {
-		load_gl_matrix(ship.get_matrix().inverse());
+		load_gl_matrix(ship->get_matrix().inverse());
 	} else {
 		dbgcam.use();
 	}
 
-	vein->draw(ship.get_position());
+	vein->draw(ship->get_position());
 
 	if(!dbg_inside) {
-		ship.dbg_draw();
+		ship->dbg_draw();
 	} else {
 		cockpit_draw();
 	}
@@ -115,6 +112,7 @@
 			break;
 
 		case '\b':
+		case 127:
 			dbg_inside = !dbg_inside;
 			if(dbg_inside) {
 				glutPassiveMotionFunc(game_input_mmotion);
@@ -163,7 +161,7 @@
 	}
 
 	if(dbg_inside) {
-		ship.turn((float)-dx / win_xsz, (float)-dy / win_ysz);
+		ship->turn((float)-dx / win_xsz, (float)-dy / win_ysz);
 
 		ignore_next_motion = true;
 		glutWarpPointer(win_xsz / 2, win_ysz / 2);
diff -r aab0d8ea21cd -r 2723dc026c4f src/ship.cc
--- a/src/ship.cc	Sun Apr 22 06:26:08 2012 +0300
+++ b/src/ship.cc	Mon Apr 23 21:43:10 2012 +0300
@@ -1,9 +1,11 @@
 #include "opengl.h"
 #include "ship.h"
+#include "vein.h"
 
-Ship::Ship()
+Ship::Ship(Vein *vein)
 {
 	friction = 0.2;
+	this->vein = vein;
 }
 
 void Ship::accelerate(double a)
@@ -27,8 +29,37 @@
 
 void Ship::update(time_sec_t dt)
 {
-	pos += velocity * dt;
+	Vector3 newpos = pos + velocity * dt;
 	velocity -= velocity * friction * dt;
+
+	HitPoint hit;
+	if(collision(vein, pos, newpos, &hit)) {
+		newpos = hit.pos;
+		// TODO damp velocity along normal
+	}
+
+	pos = newpos;
+}
+
+#define SHIP_RAD	0.25
+bool Ship::collision(const Vein *vein, const Vector3 &start, const Vector3 &end, HitPoint *hit) const
+{
+	Vector3 cent = vein->calc_center(end);
+	float rad = vein->get_radius();
+
+	Vector3 dir = end - cent;
+	float dist = dir.length();
+
+	if(dist < rad - SHIP_RAD) {
+		return false;
+	}
+
+	if(hit) {
+		Vector3 dir_norm = dir / dist;
+		hit->pos = cent + dir_norm * (rad - SHIP_RAD);
+		hit->normal = -dir_norm;
+	}
+	return true;
 }
 
 const Vector3 &Ship::get_position() const
@@ -38,13 +69,13 @@
 
 Vector3 Ship::get_direction() const
 {
-	static const Vector3 dir{0, 0, -1};
+	static const Vector3 dir(0, 0, -1);
 	return dir.transformed(rot);
 }
 
 Vector3 Ship::get_right() const
 {
-	static const Vector3 dir{1, 0, 0};
+	static const Vector3 dir(1, 0, 0);
 	return dir.transformed(rot);
 }
 
diff -r aab0d8ea21cd -r 2723dc026c4f src/ship.h
--- a/src/ship.h	Sun Apr 22 06:26:08 2012 +0300
+++ b/src/ship.h	Mon Apr 23 21:43:10 2012 +0300
@@ -4,14 +4,22 @@
 #include <vmath/vmath.h>
 #include "game.h"
 
+class Vein;
+
+struct HitPoint {
+	Vector3 pos;
+	Vector3 normal;
+};
+
 class Ship {
 private:
 	Vector3 pos, velocity;
 	Quaternion rot;
 	double friction;
+	Vein *vein;
 
 public:
-	Ship();
+	Ship(Vein *vein);
 
 	void accelerate(double a);
 	void accelerate_side(double a);
@@ -19,6 +27,8 @@
 
 	void update(time_sec_t dt);
 
+	bool collision(const Vein *vein, const Vector3 &start, const Vector3 &end,  HitPoint *hit) const;
+
 	const Vector3 &get_position() const;
 	Vector3 get_direction() const;
 	Vector3 get_right() const;
diff -r aab0d8ea21cd -r 2723dc026c4f src/sys.c
--- a/src/sys.c	Sun Apr 22 06:26:08 2012 +0300
+++ b/src/sys.c	Mon Apr 23 21:43:10 2012 +0300
@@ -5,9 +5,6 @@
 #elif defined(WIN32)
 #include <windows.h>
 #elif defined(__APPLE__)
-#error "not ported to mac yet"
-#else
-#error "unrecognized or unsupported platform"
 #endif
 
 int sys_lock_mouse(void)
diff -r aab0d8ea21cd -r 2723dc026c4f src/vein.cc
--- a/src/vein.cc	Sun Apr 22 06:26:08 2012 +0300
+++ b/src/vein.cc	Mon Apr 23 21:43:10 2012 +0300
@@ -29,20 +29,6 @@
 	free_program(sdr);
 }
 
-Vector3 Vein::calc_center(const Vector3 &ppos) const
-{
-	Vector3 pt{0, 0, ppos.z};
-	pt.x = sin(ppos.z * 0.75);
-	pt.y = cos(ppos.z * 0.2) * 0.6;
-	return pt;
-}
-
-Vector3 Vein::calc_dir(const Vector3 &ppos) const
-{
-	Vector3 dir = calc_center(ppos + Vector3(0, 0, 0.01)) - calc_center(ppos - Vector3(0, 0, 0.01));
-	return dir.normalized();
-}
-
 void Vein::build_idxbuf()
 {
 	delete [] idxbuf;
@@ -80,6 +66,16 @@
 	return true;
 }
 
+void Vein::set_radius(float rad)
+{
+	this->rad = rad;
+}
+
+float Vein::get_radius() const
+{
+	return rad;
+}
+
 void Vein::set_fog_color(const Vector3 &col)
 {
 	fog_color = col;
@@ -110,12 +106,12 @@
 		Vector3 right = cross_product(up, dir);
 		up = cross_product(dir, right);
 
-		Matrix3x3 vrot{right, up, dir};
+		Matrix3x3 vrot(right, up, dir);
 		vrot.transpose();
 
 		float theta = 0.0, dtheta = 2.0 * M_PI / (ring_subdiv - 1);
 		for(int j=0; j<ring_subdiv; j++) {
-			Vector3 vec = Vector3{-cos(theta) * rad, sin(theta) * rad, 0.0};
+			Vector3 vec = Vector3(-cos(theta) * rad, sin(theta) * rad, 0.0);
 			vec.transform(vrot);
 			vec += cent;
 
@@ -149,3 +145,17 @@
 
 	glPopMatrix();
 }
+
+Vector3 Vein::calc_center(const Vector3 &ppos) const
+{
+	Vector3 pt(0, 0, ppos.z);
+	pt.x = sin(ppos.z * 0.75);
+	pt.y = cos(ppos.z * 0.2) * 0.6;
+	return pt;
+}
+
+Vector3 Vein::calc_dir(const Vector3 &ppos) const
+{
+	Vector3 dir = calc_center(ppos + Vector3(0, 0, 0.01)) - calc_center(ppos - Vector3(0, 0, 0.01));
+	return dir.normalized();
+}
diff -r aab0d8ea21cd -r 2723dc026c4f src/vein.h
--- a/src/vein.h	Sun Apr 22 06:26:08 2012 +0300
+++ b/src/vein.h	Mon Apr 23 21:43:10 2012 +0300
@@ -16,20 +16,22 @@
 	unsigned int tex_norm;
 	Vector3 fog_color;
 
-	Vector3 calc_center(const Vector3 &ppos) const;
-	Vector3 calc_dir(const Vector3 &ppos) const;
-
 	void build_idxbuf();
 
 public:
 	Vein();
 	~Vein();
+	bool init();
 
-	bool init();
+	void set_radius(float rad);
+	float get_radius() const;
 
 	void set_fog_color(const Vector3 &col);
 
 	void draw(const Vector3 &player_pos) const;
+
+	Vector3 calc_center(const Vector3 &ppos) const;
+	Vector3 calc_dir(const Vector3 &ppos) const;
 };
 
 #endif	// VEIN_H_