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// sample BGLView app from the Be Book
#include <stdio.h>
#include <Application.h>
#include <Window.h>
#include <GLView.h>
class SampleGLView : public BGLView
{
public:
SampleGLView(BRect frame, uint32 type);
virtual void AttachedToWindow(void);
virtual void FrameResized(float newWidth, float newHeight);
virtual void ErrorCallback(GLenum which);
void Render(void);
private:
void gInit(void);
void gDraw(void);
void gReshape(int width, int height);
float width;
float height;
};
class SampleGLWindow : public BWindow
{
public:
SampleGLWindow(BRect frame, uint32 type);
virtual bool QuitRequested() { return true; }
private:
SampleGLView *theView;
};
class SampleGLApp : public BApplication
{
public:
SampleGLApp();
private:
SampleGLWindow *theWindow;
};
SampleGLApp::SampleGLApp()
: BApplication("application/x-vnd.sample")
{
BRect windowRect;
uint32 type = BGL_RGB|BGL_DOUBLE;
windowRect.Set(50, 50, 350, 350);
theWindow = new SampleGLWindow(windowRect, type);
}
SampleGLWindow::SampleGLWindow(BRect frame, uint32 type)
: BWindow(frame, "OpenGL Test", B_TITLED_WINDOW, 0)
{
theView = new SampleGLView(Bounds(), type);
AddChild(theView);
Show();
theView->Render();
}
SampleGLView::SampleGLView(BRect frame, uint32 type)
: BGLView(frame, "SampleGLView", B_FOLLOW_ALL_SIDES, 0, type)
{
width = frame.right-frame.left;
height = frame.bottom-frame.top;
}
void SampleGLView::AttachedToWindow(void)
{
LockGL();
BGLView::AttachedToWindow();
gInit();
gReshape(width, height);
UnlockGL();
}
void SampleGLView::FrameResized(float newWidth, float newHeight)
{
LockGL();
BGLView::FrameResized(width, height);
width = newWidth;
height = newHeight;
gReshape(width,height);
UnlockGL();
Render();
}
void SampleGLView::ErrorCallback(GLenum whichError)
{
// fprintf(stderr, "Unexpected error occured (%d):\\n", whichError);
// fprintf(stderr, " %s\\n", gluErrorString(whichError));
}
// globals
GLenum use_stipple_mode; // GL_TRUE to use dashed lines
GLenum use_smooth_mode; // GL_TRUE to use anti-aliased lines
GLint linesize; // Line width
GLint pointsize; // Point diameter
float pntA[3] = {
-160.0, 0.0, 0.0
};
float pntB[3] = {
-130.0, 0.0, 0.0
};
void SampleGLView::gInit(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glLineStipple(1, 0xF0E0);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
use_stipple_mode = GL_FALSE;
use_smooth_mode = GL_TRUE;
linesize = 2;
pointsize = 4;
}
void SampleGLView::gDraw(void)
{
GLint i;
glClear(GL_COLOR_BUFFER_BIT);
glLineWidth(linesize);
if (use_stipple_mode) {
glEnable(GL_LINE_STIPPLE);
} else {
glDisable(GL_LINE_STIPPLE);
}
if (use_smooth_mode) {
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
} else {
glDisable(GL_LINE_SMOOTH);
glDisable(GL_BLEND);
}
glPushMatrix();
for (i = 0; i < 360; i += 5) {
glRotatef(5.0, 0,0,1); // Rotate right 5 degrees
glColor3f(1.0, 1.0, 0.0); // Set color for line
glBegin(GL_LINE_STRIP); // And create the line
glVertex3fv(pntA);
glVertex3fv(pntB);
glEnd();
glPointSize(pointsize); // Set size for point
glColor3f(0.0, 1.0, 0.0); // Set color for point
glBegin(GL_POINTS);
glVertex3fv(pntA); // Draw point at one end
glVertex3fv(pntB); // Draw point at other end
glEnd();
}
glPopMatrix(); // Done with matrix
}
void SampleGLView::gReshape(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-175, 175, -175, 175, -1, 1);
glMatrixMode(GL_MODELVIEW);
}
void SampleGLView::Render(void)
{
LockGL();
gDraw();
SwapBuffers();
UnlockGL();
}
int main(int argc, char *argv[])
{
SampleGLApp *app = new SampleGLApp;
app->Run();
delete app;
return 0;
}
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