now the controls for the ZB transformation work

openglcanvas.cpp

@@ -28,6 +28,15 @@
 //#define CONST_PI_F      (0x1.921fb6p+1f)
 //#define CONST_PI_2_F    (0x1.921fb6p+0f)
 
+// These definitions specify which attributes should be used to store some
+// parameters passed to the vertex shader. Nvidia hardware
+// only leaves attributes 1 and 7 unreserved; attributes 8 to 15 are
+// reserved for textures.
+// TODO: we use attributes 14 and 15, which work for Nvidia; we need to
+// test with other hardware.
+#define ZBL_ATTR 14
+#define ZBR_ATTR 15
+
 OpenGLCanvas::OpenGLCanvas(QWidget *parent) :
     QGLWidget(parent)
 {
@@ -99,12 +108,14 @@ void OpenGLCanvas::change_fov_max(int new_fov_max){
 void OpenGLCanvas::change_zb_lambda(int new_zb_lambda){
     zblambda=(float)new_zb_lambda/1000;
     fprintf(stderr,"zb_lambda=%f\n",zblambda);
+    glVertexAttrib1f(ZBL_ATTR,zblambda);
     updateGL();
 }
 
 void OpenGLCanvas::change_zb_R(int new_zb_R){
-    zbR=(float)new_zb_R/1000;
+    zbR=(float)new_zb_R/100;
     fprintf(stderr,"zb_R=%f\n",zbR);
+    glVertexAttrib1f(ZBR_ATTR,zbR);
     updateGL();
 }
 
@@ -728,13 +739,7 @@ void OpenGLCanvas::setShaders() {
 
     GLuint p = glCreateProgram();
 
-    // Bind attributes zblambda and zbR to the vertex shader. Nvidia hardware
-    // only leaves attributes 1 and 7 unreserved; attributes 8 to 15 are
-    // reserved for textures.
-    // TODO: we use attributes 14 and 15, which work for Nvidia; we need to
-    // test with other hardware.
-#define ZBL_ATTR 14
-#define ZBR_ATTR 15
+    // Bind attributes zblambda and zbR to the vertex shader.
     glVertexAttrib1f(ZBL_ATTR,zblambda);
     glBindAttribLocation(p,ZBL_ATTR,"zblambda");
     glVertexAttrib1f(ZBR_ATTR,zbR);