Materialを設定し、材質の色（diffuse, ambient, specular)を設定しています。
いろいろ調べましたが、光源の設定、法線ベクトルの設定が分かりません。
OpenGLライブラリを使用しています。
プログラム
cube3.vala
using GL;
private static float alpha;
private static float beta;
void paint_cb () {
Cogl.push_matrix ();
Cogl.translate (300, 200, -200);
Cogl.rotate (alpha, 1, 0, 0);
//stdout.printf("alpha = %f \n", alpha);
Cogl.rotate (beta, 0, 1, 0);
Cogl.TextureVertex vertices1[4];
Cogl.TextureVertex vertices2[4];
Cogl.TextureVertex vertices3[4];
Cogl.TextureVertex vertices4[4];
Cogl.TextureVertex vertices5[4];
Cogl.TextureVertex vertices6[4];
Cogl.set_depth_test_enabled (true);
var material = new Cogl.Material ();
Cogl.set_source (material);
Cogl.begin_gl ();
glEnable (GL_LIGHTING);
Cogl.end_gl ();
var diffuse_color = Cogl.Color.from_4f (1.0f, 0.0f, 0.0f, 1.0f);
var ambient_color = Cogl.Color.from_4f (0.8f, 0.8f, 0.8f, 1.0f);
var specular_color = Cogl.Color.from_4f (1.0f, 1.0f, 1.0f, 1.0f);
material.set_diffuse (diffuse_color);
material.set_ambient (ambient_color);
material.set_specular (specular_color);
material.set_shininess (50.0f);
//var emission_color = Cogl.Color.from_4f (0.8f, 0.0f, 0.0f, 1.0f);
//material.set_emission (emission_color);
//Front
vertices1[0].x = -100;
vertices1[0].y = -100;
vertices1[0].z = 100;
vertices1[1].x = 100;
vertices1[1].y = -100;
vertices1[1].z = 100;
vertices1[2].x = 100;
vertices1[2].y = 100;
vertices1[2].z = 100;
vertices1[3].x = -100;
vertices1[3].y = 100;
vertices1[3].z = 100;
Cogl.polygon (vertices1, false);
//Back
vertices2[0].x = -100;
vertices2[0].y = -100;
vertices2[0].z = -100;
vertices2[1].x = 100;
vertices2[1].y = -100;
vertices2[1].z = -100;
vertices2[2].x = 100;
vertices2[2].y = 100;
vertices2[2].z = -100;
vertices2[3].x = -100;
vertices2[3].y = 100;
vertices2[3].z = -100;
Cogl.polygon (vertices2, false);
//Left
vertices3[0].x = -100;
vertices3[0].y = -100;
vertices3[0].z = 100;
vertices3[1].x = -100;
vertices3[1].y = -100;
vertices3[1].z = -100;
vertices3[2].x = -100;
vertices3[2].y = 100;
vertices3[2].z = -100;
vertices3[3].x = -100;
vertices3[3].y = 100;
vertices3[3].z = 100;
Cogl.polygon (vertices3, false);
//Right
vertices4[0].x = 100;
vertices4[0].y = -100;
vertices4[0].z = 100;
vertices4[1].x = 100;
vertices4[1].y = -100;
vertices4[1].z = -100;
vertices4[2].x = 100;
vertices4[2].y = 100;
vertices4[2].z = -100;
vertices4[3].x = 100;
vertices4[3].y = 100;
vertices4[3].z = 100;
Cogl.polygon (vertices4, false);
//Top
vertices5[0].x = -100;
vertices5[0].y = -100;
vertices5[0].z = 100;
vertices5[1].x = -100;
vertices5[1].y = -100;
vertices5[1].z = -100;
vertices5[2].x = 100;
vertices5[2].y = -100;
vertices5[2].z = -100;
vertices5[3].x = 100;
vertices5[3].y = -100;
vertices5[3].z = 100;
Cogl.polygon (vertices5, false);
//Bottom
vertices6[0].x = -100;
vertices6[0].y = 100;
vertices6[0].z = 100;
vertices6[1].x = -100;
vertices6[1].y = 100;
vertices6[1].z = -100;
vertices6[2].x = 100;
vertices6[2].y = 100;
vertices6[2].z = -100;
vertices6[3].x = 100;
vertices6[3].y = 100;
vertices6[3].z = 100;
Cogl.polygon (vertices6, false);
Cogl.pop_matrix();
}
int main (string[] args)
{
Clutter.init (ref args);
var stage = Clutter.Stage.get_default ();
stage.background_color = Clutter.Color () { alpha = 255 };
var coglbox = new Clutter.Actor ();
stage.add_actor (coglbox);
coglbox.paint.connect (paint_cb);
stage.motion_event.connect ((evt) => {
GLib.message ("Motion event - Stage");
stdout.printf ("x0 = %f y0 = %f\n", evt.x, evt.y);
alpha = alpha + 1;
stdout.printf("alpha = %f \n", alpha);
beta = beta + 1;
stdout.printf("beta = %f \n", beta);
coglbox.queue_redraw ();
return true;
});
stage.show ();
Clutter.main ();
return 0;
}
ビルド
valac --vapidir=../vapi --pkg clutter-1.0 --pkg gl cube3.vala
（vapiフォルダには、gl.vapiファイルが入っている。）
Valencia-gedit-plugin
SRCS = cube3.vala
PROGRAM = cube3
VALAPKGS = --pkg clutter-1.0 --pkg gl
VALAOPTS = --vapidir=../vapi
CFLAGS =
all: $(PROGRAM)
$(PROGRAM): $(SRCS)
(tab) valac $(VALAOPTS) $(VALAPKGS) $(CFLAGS) -o $(PROGRAM) $(SRCS)
run: $(PROGRAM)
(tab) ./$(PROGRAM)
clean:
(tab) rm -f $(PROGRAM)
