Hi,
I read on this-link that ofxMSASpline was compatible with ofxiPhone. When I popped the addon into my project, however, I got a lot of errors, most saying “‘glBegin’ was not declared in this scope”. This seems to make sense, since I heard that glBegin is not used in GL ES. Is there a newer version of MSASpline out there that is working, or is there something I’m doing wrong?
Thanks!
I looked into it and the problem was with the drawSmooth() and drawRaw() functions. They must be converted into OpenGL ES. Using an example on this-page, I converted the spline2D class:
/**************************** 2D Spline (of ofxVec2) ****************************/
class ofxMSASpline2D : public ofxMSASpline<ofxVec2f> {
public:
void drawRaw(int dotSize = 20, int lineWidth = 4){
int numItems = size();
if(lineWidth) {
glLineWidth(lineWidth);
GLfloat vertcies[numItems * 2];
for(int i=0; i<numItems; i++) {
vertcies[i*2] = at(i).x;
vertcies[(i*2)+1] = at(i).y;
}
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, vertcies);
glDrawArrays(GL_LINE_STRIP, 0, numItems);
}
if(dotSize) {
glPointSize(dotSize);
GLfloat dotVertcies[numItems * 2];
for(int i=0; i<numItems; i++) {
dotVertcies[i*2] = at(i).x;
dotVertcies[(i*2)+1] = at(i).y;
}
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, dotVertcies);
glDrawArrays(GL_POINTS, 0, numItems);
}
}
void drawSmooth(int numSteps, int dotSize = 8, int lineWidth = 2) {
if(size() < 4) return;
float spacing = 1.0/numSteps;
if(lineWidth) {
glLineWidth(lineWidth);
GLfloat lineVertcies[numSteps * 2];
int i=0;
for(float f=0; f<1; f+= spacing) {
ofxVec2f v = sampleAt(f);
lineVertcies[i*2] = v.x;
lineVertcies[(i*2)+1] = v.y;
i++;
}
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, lineVertcies);
glDrawArrays(GL_LINE_STRIP, 0, numSteps);
}
if(dotSize) {
glPointSize(dotSize);
GLfloat dotVertcies[numSteps * 2];
int i=0;
for(float f=0; f<1; f+= spacing) {
ofxVec2f v = sampleAt(f);
dotVertcies[i*2] = v.x;
dotVertcies[(i*2)+1] = v.y;
i++;
}
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, dotVertcies);
glDrawArrays(GL_POINTS, 0, numSteps);
}
}
};
hey, thanks for this, next version will have this in (coming soon).