can now also draw the normal vectors (seems very useful for instructive

[freeglut] / progs / demos / shapes / shapes.c

diff --git a/progs/demos/shapes/shapes.c b/progs/demos/shapes/shapes.c
index e91a969..b2da232 100644 (file)
--- a/progs/demos/shapes/shapes.c
+++ b/progs/demos/shapes/shapes.c
@@ -91,9 +91,12 @@ typedef char ourGLchar;
 #define APIENTRY
 #endif
 
+#ifndef GL_VERSION_1_5
 typedef void (APIENTRY *PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
 typedef void (APIENTRY *PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
 typedef void (APIENTRY *PFNGLBUFFERDATAPROC) (GLenum target, ourGLsizeiptr size, const GLvoid *data, GLenum usage);
+#endif
+#ifndef GL_VERSION_2_0
 typedef GLuint (APIENTRY *PFNGLCREATESHADERPROC) (GLenum type);
 typedef void (APIENTRY *PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const ourGLchar **string, const GLint *length);
 typedef void (APIENTRY *PFNGLCOMPILESHADERPROC) (GLuint shader);
@@ -109,6 +112,7 @@ typedef GLint (APIENTRY *PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const ourG
 typedef GLint (APIENTRY *PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const ourGLchar *name);
 typedef void (APIENTRY *PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
 typedef void (APIENTRY *PFNGLUNIFORMMATRIX3FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+#endif
 
 PFNGLCREATESHADERPROC gl_CreateShader;
 PFNGLSHADERSOURCEPROC gl_ShaderSource;
@@ -416,6 +420,7 @@ static float ar;
 static GLboolean persProject = GL_TRUE;
 static GLboolean animateXRot = GL_FALSE;
 static GLboolean useShader   = GL_FALSE;
+static GLboolean visNormals  = GL_FALSE;
 
 /*
  * These one-liners draw particular objects, fetching appropriate
@@ -537,7 +542,7 @@ static const entry table [] =
     ENTRY (Sphere),
     ENTRY (Cone),
     ENTRY (Cylinder),
-    ENTRY (Cuboctahedron)
+    ENTRY (Cuboctahedron)   /* This one doesn't work when in shader mode and is then skipped */
 };
 #undef ENTRY
 
@@ -600,8 +605,8 @@ resize(int width, int height)
 static void display(void)
 {
     const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
-    const double a = t*90.0;
-    const double b = (animateXRot?t:1)*60.0;
+    const double a = t*89.0;
+    const double b = (animateXRot?t:1)*67.0;
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
@@ -655,6 +660,7 @@ static void display(void)
     else
     {
         /* fixed function pipeline */
+        glutSetOption(GLUT_OBJECTS_VISUALIZE_NORMALS,visNormals);   /* Normals visualized or not? */
         glMatrixMode(GL_PROJECTION);
         glLoadIdentity();
         if (persProject)
@@ -694,14 +700,21 @@ static void display(void)
         shapesPrintf (5, 1, "Outer radius  Up  Down : %f", orad);
         shapesPrintf (6, 1, "Inner radius Left Right: %f", irad);
         if (persProject)
-            shapesPrintf (7, 1, "Perspective projection");
+            shapesPrintf (7, 1, "Perspective projection (p)");
         else
-            shapesPrintf (7, 1, "Orthographic projection");
+            shapesPrintf (7, 1, "Orthographic projection (p)");
         if (useShader)
-            shapesPrintf (8, 1, "Using shader");
+            shapesPrintf (8, 1, "Using shader (s)");
         else
-            shapesPrintf (8, 1, "Using fixed function pipeline");
+            shapesPrintf (8, 1, "Using fixed function pipeline (s)");
+        if (animateXRot)
+            shapesPrintf (9, 1, "2D rotation (r)");
+        else
+            shapesPrintf (9, 1, "1D rotation (r)");
+        if (!useShader)
+            shapesPrintf (10, 1, "visualizing normals: %i (n)",visNormals);
     } else {
+        /* print to command line instead */
         printf ( "Shape %d slides %d stacks %d\n", function_index, slices, stacks ) ;
     }
 
@@ -748,6 +761,9 @@ key(unsigned char key, int x, int y)
     case 'S':
     case 's': useShader=!useShader;       break;
 
+    case 'N':
+    case 'n': visNormals=!visNormals;     break;
+
     default:
         break;
     }
@@ -800,7 +816,7 @@ const GLfloat high_shininess[] = { 100.0f };
 int
 main(int argc, char *argv[])
 {
-    glutInitWindowSize(640,480);
+    glutInitWindowSize(800,600);
     glutInitWindowPosition(40,40);
     glutInit(&argc, argv);
     glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_MULTISAMPLE);