fixed shader route in shapes demo:

- small bug in gl_frustum implementation in matrix lib, element (4,4)
  should be 0
- default OpenGL ambient color is (.2, .2, .2, 1.), not black
little bit of formatting


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1388 7f0cb862-5218-0410-a997-914c9d46530a

freeglut/freeglut/progs/demos/shapes/glmatrix.c

@@ -160,6 +160,7 @@ void gl_frustum(float left, float right, float bottom, float top, float near, fl
     mat[10] = c;
     mat[11] = -1.f;
     mat[14] = d;
+    mat[15] = 0;
 
     gl_mult_matrixf(mat);
 }

freeglut/freeglut/progs/demos/shapes/shapes.c

@@ -196,7 +196,7 @@ const ourGLchar *fragmentShaderSource[] = {
     "  180.0, 0.0,",
     "  vec3(0.0, 0.0, 0.0)",
     ");",
-    "vec4 scene_ambient = vec4(0.0, 0.0, 0.0, 1.0);",
+    "vec4 scene_ambient = vec4(0.2, 0.2, 0.2, 1.0);",
     " ",
     "struct material",
     "{",