Allow floating object around the center object

Former-commit-id: 7e35a8b2ef76b3e4160d28f273f038a08f6ad0eb

src/gl_draw.c

@@ -54,10 +54,13 @@ int yearabs = 365;
 int day = 0;
 int dayabs = 30;
 HE_obj *obj;
+HE_obj *float_obj;
+HE_obj *bez_obj;
 bool show_normals = false;
 bool shademodel = true;
+bool draw_bezier = true;
 bool draw_frame = false;
-float ball_speed = 1.0f;
+float ball_speed = 0.2f;
 
 
 
@@ -203,6 +206,7 @@ void draw_vertices(HE_obj const * const obj,
 		} while ((tmp_edge = tmp_edge->next) != obj->faces[i].edge);
 		glEnd();
 	}
+
 	glPopMatrix();
 }
 
@@ -319,6 +323,9 @@ void draw_bez_frame(const bez_curv *bez,
 	bez_curv cur_bez = *bez;
 	bez_curv next_bez = { NULL, 0 };
 
+	glPushMatrix();
+	glColor3f(0.0, 1.0, 0.0);
+
 	while ((get_reduced_bez_curv(&cur_bez, &next_bez, pos))) {
 
 		glBegin(GL_LINES);
@@ -341,6 +348,7 @@ void draw_bez_frame(const bez_curv *bez,
 	}
 	free(cur_bez.vec);
 
+	glPopMatrix();
 }
 
 /**
@@ -366,6 +374,37 @@ void draw_ball(const bez_curv *bez,
 	free(point);
 }
 
+/**
+ * Draws a ship on the bezier curve at the given position.
+ *
+ * @param bez the bezier curve to draw the ship on
+ * @param pos the position of the ship
+ * @param scale_fac the scale factor
+ */
+void draw_ship(const bez_curv *bez,
+		const float pos,
+		const float scale_fac)
+{
+	const float ship_pos = pos;
+	vector *point;
+
+
+	glPushMatrix();
+
+	glColor3f(0.0, 1.0, 0.0);
+	point = calculate_bezier_point(bez,
+			ship_pos);
+	glTranslatef(point->x, point->y, point->z);
+	glScalef(VISIBILITY_FACTOR * scale_fac,
+			VISIBILITY_FACTOR * scale_fac,
+			VISIBILITY_FACTOR * scale_fac);
+	draw_vertices(float_obj, false);
+
+	glPopMatrix();
+
+	free(point);
+}
+
 
 /**
  * Draws an object.
@@ -431,11 +470,34 @@ void draw_obj(int32_t const myxrot,
 		draw_vertices(obj, false);
 	}
 
-	if (obj->bzc != 0) {
-		draw_bez(&(obj->bez_curves[0]), bez_inc);
-		draw_ball(&(obj->bez_curves[0]), ball_inc);
+	glPopMatrix();
+
+	glPushMatrix();
+
+	FIND_CENTER(bez_obj, &center_vert);
+
+	/* rotate according to static members */
+	glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
+	glScalef(VISIBILITY_FACTOR * 5,
+			VISIBILITY_FACTOR * 5,
+			VISIBILITY_FACTOR * 5);
+	glRotatef(xrot, 1.0f, 0.0f, 0.0f);
+	glRotatef(yrot, 0.0f, 1.0f, 0.0f);
+	glRotatef(zrot, 0.0f, 0.0f, 1.0f);
+	glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
+
+	/* pull into middle of universe */
+	glTranslatef(-center_vert.x,
+			-center_vert.y,
+			-center_vert.z + SYSTEM_POS_Z);
+
+	if (bez_obj->bzc != 0) {
+		if(draw_bezier)
+			draw_bez(&(bez_obj->bez_curves[0]), bez_inc);
 		if(draw_frame)
-			draw_bez_frame(&(obj->bez_curves[0]), ball_inc);
+			draw_bez_frame(&(bez_obj->bez_curves[0]), ball_inc);
+
+		draw_ship(&(bez_obj->bez_curves[0]), ball_inc, 0.03);
 	}
 
 	glPopMatrix();

src/gl_draw.h

@@ -59,9 +59,12 @@
 extern int yearabs;
 extern int dayabs;
 extern HE_obj *obj;
+extern HE_obj *float_obj;
+extern HE_obj *bez_obj;
 extern bool show_normals;
 extern bool shademodel;
 extern bool draw_frame;
+extern bool draw_bezier;
 extern float ball_speed;
 
 

src/gl_setup.c

@@ -275,7 +275,11 @@ static bool process_keypress(SDL_KeyboardEvent *key_event)
 		}
 		break;
 	case 'f':
-		draw_frame = !draw_frame;
+		if (mod & KMOD_SHIFT) {
+			draw_bezier = !draw_bezier;
+		} else {
+			draw_frame = !draw_frame;
+		}
 		break;
 	case 'l':
 		if (mod & KMOD_SHIFT) {
@@ -323,16 +327,32 @@ static void gl_destroy(SDL_Window *win, SDL_GLContext glctx)
 /**
  * Initialize the global obj object.
  *
- * @param filename the file to parse and build the object from
+ * @param sun the file to parse and build the object from which
+ * will construct the sun
+ * @param object the file to parse and build the object from which
+ * will float around the sun
+ * @param bez the file to parse and build the object from which
+ * will define on which curve the object floats around the sun
  */
-void init_object(char const * const filename)
+void init_object(char const * const sun,
+		char const * const object,
+		char const * const bez)
 {
-	obj = read_obj_file(filename);
+	obj = read_obj_file(sun);
+	float_obj = read_obj_file(object);
+	bez_obj	= read_obj_file(bez);
 
-	if (!obj)
-		ABORT("Failed to read object file \"%s\"!", filename);
+	if (!obj) {
+		ABORT("Failed to read object file \"%s\"!", sun);
+	} else if (!float_obj) {
+		ABORT("Failed to read object file \"%s\"!", object);
+	} else if (!bez_obj) {
+		ABORT("Failed to read object file \"%s\"!", bez);
+	}
 
 	NORMALIZE_OBJECT(obj);
+	NORMALIZE_OBJECT(float_obj);
+	NORMALIZE_OBJECT(bez_obj);
 }
 
 /**

src/gl_setup.h

@@ -26,7 +26,9 @@
 #define _DROW_ENGINE_SETUP_H
 
 
-void init_object(char const * const filename);
+void init_object(char const * const sun,
+		char const * const object,
+		char const * const bez);
 void init_sdl_loop(void);
 
 

src/main.c

@@ -40,19 +40,20 @@
 /**
  * Program help text.
  */
-char const * const helptext = "Usage: drow-engine <file.obj>\n";
+char const * const helptext = "Usage: drow-engine <center.obj>"
+" <float.obj> <bez.obj>\n";
 
 
 int main(int argc, char *argv[])
 {
-	if (argc == 1) {
+	if (argc != 4) {
 		printf("%s", helptext);
 		return 1;
 	}
 
 	glutInit(&argc, argv);
 
-	init_object(argv[1]);
+	init_object(argv[1], argv[2], argv[3]);
 	init_sdl_loop();
 
 	return 0;