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package jogamp.opengl.glu.gl2.nurbs;
import jogamp.opengl.glu.nurbs.*;
import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GL2GL3;
import com.jogamp.opengl.glu.GLU;
import com.jogamp.opengl.glu.gl2.GLUgl2;
/**
* Class rendering curves with OpenGL
* @author Tomáš Hráský
*
*/
class GL2CurveEvaluator implements CurveEvaluator {
/**
* Output triangles (for callback) or render curve
*/
private boolean output_triangles;
/**
* OpenGL object
*/
private final GL2 gl;
/**
* Not used
*/
private int vertex_flag;
/**
* Not used
*/
private int normal_flag;
/**
* Not used
*/
private int color_flag;
/**
* Not used
*/
private int texcoord_flag;
/**
* Number of bezier arc - used for color distinguishing of arcs forming NURBS curve
*/
private int poradi;
/**
* Makes new Evaluator
*/
public GL2CurveEvaluator() {
gl = GLUgl2.getCurrentGL2();
}
/**
* Pushes eval bit
*/
@Override
public void bgnmap1f() {
// DONE
if (output_triangles) {
vertex_flag = 0;
normal_flag = 0;
color_flag = 0;
texcoord_flag = 0;
} else {
gl.glPushAttrib(GL2.GL_EVAL_BIT);
}
}
/**
* Pops all OpenGL attributes
*/
@Override
public void endmap1f() {
// DONE
if (output_triangles) {
} else {
gl.glPopAttrib();
}
}
/**
* Initializes opengl evaluator
* @param type curve type
* @param ulo lowest u
* @param uhi highest u
* @param stride control point coords
* @param order curve order
* @param ps control points
*/
@Override
public void map1f(final int type, final float ulo, final float uhi, final int stride, final int order,
final CArrayOfFloats ps) {
if (output_triangles) {
// TODO code for callback (output_triangles probably indicates callback)
// System.out.println("TODO curveevaluator.map1f-output_triangles");
} else {
gl.glMap1f(type, ulo, uhi, stride, order, ps.getArray(), ps
.getPointer());
// DEBUG - drawing bézier control points
// gl.glColor3d(.5,.5,.5);
// gl.glPointSize(5);
// gl.glBegin(GL2.GL_POINTS);
// float[] ctrlpoints=ps.getArray();
// for(int i=ps.getPointer();i<ps.getPointer()+order;i++){
// gl.glVertex3d(ctrlpoints[i * 4], ctrlpoints[i * 4 + 1],0);
// }
// gl.glEnd();
}
}
/**
* Calls opengl enable
* @param type what to enable
*/
@Override
public void enable(final int type) {
// DONE
gl.glEnable(type);
}
/**
* Calls glMapGrid1f
* @param nu steps
* @param u1 low u
* @param u2 high u
*/
@Override
public void mapgrid1f(final int nu, final float u1, final float u2) {
if (output_triangles) {
// System.out.println("TODO curveevaluator.mapgrid1f");
} else
gl.glMapGrid1f(nu, u1, u2);
// // System.out.println("upravit NU");
// gl.glMapGrid1f(50,u1,u2);
}
/**
* Evaluates a curve using glEvalMesh1f
* @param style Backend.N_MESHFILL/N_MESHLINE/N_MESHPOINT
* @param from lowest param
* @param to highest param
*/
@Override
public void mapmesh1f(final int style, final int from, final int to) {
/* //DEBUG drawing control points
this.poradi++;
if (poradi % 2 == 0)
gl.glColor3f(1, 0, 0);
else
gl.glColor3f(0, 1, 0);
*/
if (output_triangles) {
// TODO code for callback
// System.out.println("TODO openglcurveevaluator.mapmesh1f output_triangles");
} else {
switch (style) {
case Backend.N_MESHFILL:
case Backend.N_MESHLINE:
gl.glEvalMesh1(GL2GL3.GL_LINE, from, to);
break;
case Backend.N_MESHPOINT:
gl.glEvalMesh1(GL2GL3.GL_POINT, from, to);
break;
}
}
}
}
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