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//========================================================================
// This is a small test application for GLFW.
// The program opens a window (640x480), and renders a spinning colored
// triangle (it is controlled with both the GLFW timer and the mouse). It
// also calculates the rendering speed (FPS), which is displayed in the
// window title bar.
//========================================================================
#include <stdio.h>
#include <GL/glfw.h>
//========================================================================
// main()
//========================================================================
int main( void )
{
int width, height, running, frames, x, y;
double t, t0, fps;
char titlestr[ 200 ];
// Initialise GLFW
glfwInit();
// Open OpenGL window
if( !glfwOpenWindow( 640, 480, 0,0,0,0, 0,0, GLFW_WINDOW ) )
{
glfwTerminate();
return 0;
}
// Enable sticky keys
glfwEnable( GLFW_STICKY_KEYS );
// Disable vertical sync (on cards that support it)
glfwSwapInterval( 0 );
// Main loop
running = GL_TRUE;
frames = 0;
t0 = glfwGetTime();
while( running )
{
// Get time and mouse position
t = glfwGetTime();
glfwGetMousePos( &x, &y );
// Calculate and display FPS (frames per second)
if( (t-t0) > 1.0 || frames == 0 )
{
fps = (double)frames / (t-t0);
sprintf( titlestr, "Spinning Triangle (%.1f FPS)", fps );
glfwSetWindowTitle( titlestr );
t0 = t;
frames = 0;
}
frames ++;
// Get window size (may be different than the requested size)
glfwGetWindowSize( &width, &height );
height = height > 0 ? height : 1;
// Set viewport
glViewport( 0, 0, width, height );
// Clear color buffer
glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
glClear( GL_COLOR_BUFFER_BIT );
// Select and setup the projection matrix
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( 65.0f, (GLfloat)width/(GLfloat)height, 1.0f,
100.0f );
// Select and setup the modelview matrix
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt( 0.0f, 1.0f, 0.0f, // Eye-position
0.0f, 20.0f, 0.0f, // View-point
0.0f, 0.0f, 1.0f ); // Up-vector
// Draw a rotating colorful triangle
glTranslatef( 0.0f, 14.0f, 0.0f );
glRotatef( 0.3*(GLfloat)x + (GLfloat)t*100.0f, 0.0f, 0.0f, 1.0f );
glBegin( GL_TRIANGLES );
glColor3f( 1.0f, 0.0f, 0.0f );
glVertex3f( -5.0f, 0.0f, -4.0f );
glColor3f( 0.0f, 1.0f, 0.0f );
glVertex3f( 5.0f, 0.0f, -4.0f );
glColor3f( 0.0f, 0.0f, 1.0f );
glVertex3f( 0.0f, 0.0f, 6.0f );
glEnd();
// Swap buffers
glfwSwapBuffers();
// Check if the ESC key was pressed or the window was closed
running = !glfwGetKey( GLFW_KEY_ESC ) &&
glfwGetWindowParam( GLFW_OPENED );
}
// Close OpenGL window and terminate GLFW
glfwTerminate();
return 0;
}
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