# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1385837606 -7200
# Node ID f61cc1df533c92b66ce1ad5e487d7436dba0289e
# Parent  7d6b667821cf2d748d5052f51451cfba904b8ff2
added viewscn example (under dev)

diff -r 7d6b667821cf -r f61cc1df533c examples/viewscn/Makefile
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/viewscn/Makefile	Sat Nov 30 20:53:26 2013 +0200
@@ -0,0 +1,19 @@
+src = $(wildcard src/*.cc)
+obj = $(src:.cc=.o)
+bin = viewscn
+
+CXXFLAGS = -pedantic -Wall -g
+LDFLAGS = $(libgl) -lgoat3dgfx -lvmath
+
+ifeq ($(shell uname -s), Darwin)
+	libgl = -framework OpenGL -framework GLUT -lGLEW
+else
+	libgl = -lGL -lGLU -lglut -lGLEW
+endif
+
+$(bin): $(obj)
+	$(CXX) -o $@ $(obj) $(LDFLAGS)
+
+.PHONY: clean
+clean:
+	rm -f $(obj) $(bin)
diff -r 7d6b667821cf -r f61cc1df533c examples/viewscn/src/main.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/viewscn/src/main.cc	Sat Nov 30 20:53:26 2013 +0200
@@ -0,0 +1,155 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <algorithm>
+#include <goat3dgfx/goat3dgfx.h>
+#include <vmath/vmath.h>
+
+using namespace goatgfx;
+
+static bool init();
+static void cleanup();
+static void display();
+static void reshape(int x, int y);
+static void keyboard(unsigned char key, int x, int y);
+static void mouse(int bn, int st, int x, int y);
+static void motion(int x, int y);
+static bool parse_args(int argc, char **argv);
+
+static float cam_theta, cam_phi;
+static const char *scene_filename;
+static Scene *scn;
+
+int main(int argc, char **argv)
+{
+	glutInit(&argc, argv);
+	glutInitWindowSize(800, 600);
+	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
+	glutCreateWindow("viewscn");
+
+	glutDisplayFunc(display);
+	glutReshapeFunc(reshape);
+	glutKeyboardFunc(keyboard);
+	glutMouseFunc(mouse);
+	glutMotionFunc(motion);
+
+	if(!parse_args(argc, argv)) {
+		return 1;
+	}
+
+	if(!init()) {
+		return 1;
+	}
+	atexit(cleanup);
+
+	glutMainLoop();
+	return 0;
+}
+
+static bool init()
+{
+	glewInit();
+
+	glEnable(GL_DEPTH_TEST);
+	glEnable(GL_CULL_FACE);
+
+	scn = new Scene;
+	if(!scn->load(scene_filename)) {
+		fatal_log("failed to load scene: %s\n", scene_filename);
+		return false;
+	}
+
+	return true;
+}
+
+static void cleanup()
+{
+	delete scn;
+}
+
+static void display()
+{
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	Matrix4x4 view_matrix;
+	view_matrix.rotate(Vector3(1, 0, 0), M_PI * cam_phi / 180.0);
+	view_matrix.rotate(Vector3(0, 1, 0), M_PI * cam_theta / 180.0);
+	set_view_matrix(view_matrix);
+
+	setup_gl_matrices();
+
+	scn->draw();
+
+	glutSwapBuffers();
+	CHECKGLERR;
+}
+
+static void reshape(int x, int y)
+{
+	glViewport(0, 0, x, y);
+
+	Matrix4x4 proj;
+	proj.set_perspective(M_PI / 4.0, (float)x / (float)y, 0.5, 500.0);
+	set_projection_matrix(proj);
+}
+
+static void keyboard(unsigned char key, int x, int y)
+{
+	switch(key) {
+	case 27:
+		exit(0);
+	}
+}
+
+static bool bnstate[16];
+static int prev_x, prev_y;
+
+static void mouse(int bn, int st, int x, int y)
+{
+	bnstate[bn - GLUT_LEFT_BUTTON] = st == GLUT_DOWN;
+	prev_x = x;
+	prev_y = y;
+}
+
+static void motion(int x, int y)
+{
+	int dx = x - prev_x;
+	int dy = y - prev_y;
+	prev_x = x;
+	prev_y = y;
+
+	if(!dx && !dy) return;
+
+	if(bnstate[0]) {
+		cam_theta += dx * 0.5;
+		cam_phi += dy * 0.5;
+		cam_phi = std::max(-90.0f, std::min(90.0f, cam_phi));
+		glutPostRedisplay();
+	}
+}
+
+static bool parse_args(int argc, char **argv)
+{
+	for(int i=1; i<argc; i++) {
+		if(argv[i][0] == '-' && argv[i][2] == 0) {
+			switch(argv[i][1]) {
+			case 'h':
+			default:
+				printf("usage: %s <filename>\n", argv[i]);
+				exit(0);
+			}
+		} else {
+			if(scene_filename) {
+				fprintf(stderr, "unexpected argument: %s\n", argv[i]);
+				return false;
+			}
+			scene_filename = argv[i];
+		}
+	}
+
+	if(!scene_filename) {
+		fprintf(stderr, "you must specify the scene file to view\n");
+		return false;
+	}
+
+	return true;
+}