void clampPaddles()
{
float frustum[6];
projmat_get_frustum(frustum, -1, -1);
// left screen boundary
if(paddleA.xpos < frustum[0]+paddleA.width/2)
paddleA.xpos = frustum[0]+paddleA.width/2;
if(paddleB.xpos < frustum[0]+paddleB.width/2)
paddleB.xpos = frustum[0]+paddleB.width/2;
// right screen boundary
if(paddleA.xpos > frustum[1]-paddleA.width/2)
paddleA.xpos = frustum[1]-paddleA.width/2;
if(paddleB.xpos > frustum[1]-paddleB.width/2)
paddleB.xpos = frustum[1]-paddleB.width/2;
}
/* Called by GLUT whenever the window needs to be redrawn. This
* function should not be called directly by the programmer. Instead,
* we can call glutPostRedisplay() to request that GLUT call display()
* at some point. */
void display()
{
/* If we are using DGR, send or receive data to keep multiple
* processes/computers synchronized. */
dgr_update();
glClearColor(.2,.2,.2,0); // set clear color to grey
// Clear the screen to black, clear the depth buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST); // turn on depth testing
kuhl_errorcheck();
/* Render the scene once for each viewport. Frequently one
* viewport will fill the entire screen. However, this loop will
* run twice for HMDs (once for the left eye and once for the
* right. */
for(int viewportID=0; viewportID<viewmat_num_viewports(); viewportID++)
{
/* Where is the viewport that we are drawing onto and what is its size? */
int viewport[4]; // x,y of lower left corner, width, height
viewmat_get_viewport(viewport, viewportID);
glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
/* Get the frustum information which will be later used to generate a perspective projection matrix. */
float f[6]; // left, right, top, bottom, near>0, far>0
projmat_get_frustum(f, viewport[2], viewport[3]);
/* Get the view or camera matrix; update the frustum values if needed. */
float viewMat[16];
viewmat_get(viewMat, f, viewportID);
/* Create a 4x4 perspective projection matrix from the frustum values. */
float perspective[16];
mat4f_frustum_new(perspective,f[0], f[1], f[2], f[3], f[4], f[5]);
/* Calculate an angle to rotate the
* object. glutGet(GLUT_ELAPSED_TIME) is the number of
* milliseconds since glutInit() was called. */
int count = glutGet(GLUT_ELAPSED_TIME) % 10000; // get a counter that repeats every 10 seconds
float angle = count / 10000.0 * 360; // rotate 360 degrees every 10 seconds
/* Make sure all computers/processes use the same angle */
dgr_setget("angle", &angle, sizeof(GLfloat));
/* Create a 4x4 rotation matrix based on the angle we computed. */
float rotateMat[16];
mat4f_rotateAxis_new(rotateMat, angle, 0,1,0);
/* Create a scale matrix. */
float scaleMatrix[16];
mat4f_scale_new(scaleMatrix, 3, 3, 3);
// Modelview = (viewMatrix * scaleMatrix) * rotationMatrix
float modelview[16];
mat4f_mult_mat4f_new(modelview, viewMat, scaleMatrix);
mat4f_mult_mat4f_new(modelview, modelview, rotateMat);
kuhl_errorcheck();
glUseProgram(program);
kuhl_errorcheck();
/* Send the perspective projection matrix to the vertex program. */
glUniformMatrix4fv(kuhl_get_uniform("Projection"),
1, // number of 4x4 float matrices
0, // transpose
perspective); // value
/* Send the modelview matrix to the vertex program. */
glUniformMatrix4fv(kuhl_get_uniform("ModelView"),
1, // number of 4x4 float matrices
0, // transpose
modelview); // value
kuhl_errorcheck();
/* Draw the geometry using the matrices that we sent to the
* vertex programs immediately above */
kuhl_geometry_draw(&triangle);
kuhl_geometry_draw(&quad);
glUseProgram(0); // stop using a GLSL program.
} // finish viewport loop
/* Check for errors. If there are errors, consider adding more
* calls to kuhl_errorcheck() in your code. */
kuhl_errorcheck();
/* Display the buffer we just drew (necessary for double buffering). */
glutSwapBuffers();
/* Ask GLUT to call display() again. We shouldn't call display()
* ourselves recursively because it will not leave time for GLUT
* to call other callback functions for when a key is pressed, the
* window is resized, etc. */
glutPostRedisplay();
}
void display()
{
/* If we are using DGR, send or receive data to keep multiple
* processes/computers synchronized. */
dgr_update();
/* Get current frames per second calculations. */
float fps = kuhl_getfps(&fps_state);
if(dgr_is_enabled() == 0 || dgr_is_master())
{
// If DGR is being used, only display dgr counter if we are
// the master process.
// Check if FPS value was just updated by kuhl_getfps()
if(fps_state.frame == 0)
{
char label[1024];
snprintf(label, 1024, "FPS: %0.1f", fps);
/* Delete old label if it exists */
if(fpsLabel != 0)
glDeleteTextures(1, &fpsLabel);
/* Make a new label */
float labelColor[3] = { 1,1,1 };
float labelBg[4] = { 0,0,0,.3 };
/* Change the last parameter (point size) to adjust the
* size of the texture that the text is rendered in to. */
fpsLabelAspectRatio = kuhl_make_label(label,
&fpsLabel,
labelColor, labelBg, 24);
if(fpsLabel != 0)
kuhl_geometry_texture(&labelQuad, fpsLabel, "tex", 1);
}
}
/* Ensure the slaves use the same render style as the master
* process. */
dgr_setget("style", &renderStyle, sizeof(int));
/* Render the scene once for each viewport. Frequently one
* viewport will fill the entire screen. However, this loop will
* run twice for HMDs (once for the left eye and once for the
* right. */
viewmat_begin_frame();
for(int viewportID=0; viewportID<viewmat_num_viewports(); viewportID++)
{
viewmat_begin_eye(viewportID);
/* Where is the viewport that we are drawing onto and what is its size? */
int viewport[4]; // x,y of lower left corner, width, height
viewmat_get_viewport(viewport, viewportID);
glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
/* Clear the current viewport. Without glScissor(), glClear()
* clears the entire screen. We could call glClear() before
* this viewport loop---but on order for all variations of
* this code to work (Oculus support, etc), we can only draw
* after viewmat_begin_eye(). */
glScissor(viewport[0], viewport[1], viewport[2], viewport[3]);
glEnable(GL_SCISSOR_TEST);
glClearColor(.2,.2,.2,0); // set clear color to grey
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glEnable(GL_DEPTH_TEST); // turn on depth testing
kuhl_errorcheck();
/* Turn on blending (note, if you are using transparent textures,
the transparency may not look correct unless you draw further
items before closer items.). */
glEnable(GL_BLEND);
glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD);
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO);
/* Get the view or camera matrix; update the frustum values if needed. */
float viewMat[16], perspective[16];
viewmat_get(viewMat, perspective, viewportID);
glUseProgram(program);
kuhl_errorcheck();
/* Send the perspective projection matrix to the vertex program. */
glUniformMatrix4fv(kuhl_get_uniform("Projection"),
1, // number of 4x4 float matrices
0, // transpose
perspective); // value
float modelMat[16];
get_model_matrix(modelMat);
float modelview[16];
mat4f_mult_mat4f_new(modelview, viewMat, modelMat); // modelview = view * model
/* Send the modelview matrix to the vertex program. */
glUniformMatrix4fv(kuhl_get_uniform("ModelView"),
1, // number of 4x4 float matrices
0, // transpose
modelview); // value
glUniform1i(kuhl_get_uniform("renderStyle"), renderStyle);
// Copy far plane value into vertex program so we can render depth buffer.
float f[6]; // left, right, bottom, top, near>0, far>0
projmat_get_frustum(f, viewport[2], viewport[3]);
glUniform1f(kuhl_get_uniform("farPlane"), f[5]);
kuhl_errorcheck();
kuhl_geometry_draw(modelgeom); /* Draw the model */
kuhl_errorcheck();
if(showOrigin)
{
/* Save current line width */
GLfloat origLineWidth;
glGetFloatv(GL_LINE_WIDTH, &origLineWidth);
glLineWidth(4); // make lines thick
/* Object coordinate system origin */
kuhl_geometry_draw(origingeom); /* Draw the origin marker */
/* World coordinate origin */
mat4f_copy(modelview, viewMat);
glUniformMatrix4fv(kuhl_get_uniform("ModelView"),
1, // number of 4x4 float matrices
0, // transpose
modelview); // value
kuhl_geometry_draw(origingeom); /* Draw the origin marker */
/* Restore line width */
glLineWidth(origLineWidth);
}
if(dgr_is_enabled() == 0 || dgr_is_master())
{
/* The shape of the frames per second quad depends on the
* aspect ratio of the label texture and the aspect ratio of
* the window (because we are placing the quad in normalized
* device coordinates). */
int windowWidth, windowHeight;
viewmat_window_size(&windowWidth, &windowHeight);
float windowAspect = windowWidth / (float)windowHeight;
float stretchLabel[16];
mat4f_scale_new(stretchLabel, 1/8.0 * fpsLabelAspectRatio / windowAspect, 1/8.0, 1);
/* Position label in the upper left corner of the screen */
float transLabel[16];
mat4f_translate_new(transLabel, -.9, .8, 0);
mat4f_mult_mat4f_new(modelview, transLabel, stretchLabel);
glUniformMatrix4fv(kuhl_get_uniform("ModelView"), 1, 0, modelview);
/* Make sure we don't use a projection matrix */
float identity[16];
mat4f_identity(identity);
glUniformMatrix4fv(kuhl_get_uniform("Projection"), 1, 0, identity);
/* Don't use depth testing and make sure we use the texture
* rendering style */
glDisable(GL_DEPTH_TEST);
glUniform1i(kuhl_get_uniform("renderStyle"), 1);
kuhl_geometry_draw(&labelQuad); /* Draw the quad */
glEnable(GL_DEPTH_TEST);
kuhl_errorcheck();
}
glUseProgram(0); // stop using a GLSL program.
} // finish viewport loop
viewmat_end_frame();
/* Update the model for the next frame based on the time. We
* convert the time to seconds and then use mod to cause the
* animation to repeat. */
int time = glutGet(GLUT_ELAPSED_TIME);
dgr_setget("time", &time, sizeof(int));
kuhl_update_model(modelgeom, 0, ((time%10000)/1000.0));
/* Check for errors. If there are errors, consider adding more
* calls to kuhl_errorcheck() in your code. */
kuhl_errorcheck();
//kuhl_video_record("videoout", 30);
/* Ask GLUT to call display() again. We shouldn't call display()
* ourselves recursively because it will not leave time for GLUT
* to call other callback functions for when a key is pressed, the
* window is resized, etc. */
glutPostRedisplay();
}
void display()
{
/* If we are using DGR, send or receive data to keep multiple
* processes/computers synchronized. */
dgr_update();
/* Syncronize the DGR objects */
dgr_setget("paddleA", &paddleA, sizeof(Paddle));
dgr_setget("paddleB", &paddleB, sizeof(Paddle));
dgr_setget("ball", &ball, sizeof(Ball));
dgr_setget("planet", planet, sizeof(float)*3);
dgr_setget("state", &gameState, sizeof(int));
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_NORMALIZE);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glEnable(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glClearColor(0,0,0,0);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float frustum[6];
projmat_get_frustum(frustum, -1, -1);
glOrtho(frustum[0], frustum[1], frustum[2], frustum[3], frustum[4], frustum[5]);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// Pick a depth that is between the near and far planes.
float depth = -(frustum[4] + frustum[5])/2.0;
// Move the light source
GLfloat position[] = { 1.0f, -1.0f, depth+5.5f, 1.0f };
glLightfv(GL_LIGHT0, GL_POSITION, position);
// Draw the background stars
float masterfrust[6];
projmat_get_master_frustum(masterfrust);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D, texIdStars);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// Draw the background quad with the scrolling star texture
float tickmod = ticks / 200.0f;
glBegin(GL_QUADS);
glTexCoord2f(tickmod+1.0f, -tickmod);
glVertex3f(masterfrust[1], masterfrust[3], depth-3.0);
glTexCoord2f(tickmod, -tickmod);
glVertex3f(masterfrust[0], masterfrust[3], depth-3.0);
glTexCoord2f(tickmod, 1.0f-tickmod);
glVertex3f(masterfrust[0], masterfrust[2], depth-3.0);
glTexCoord2f(tickmod+1.0f, 1.0f-tickmod);
glVertex3f(masterfrust[1], masterfrust[2], depth-3.0);
glEnd();
//Draw the earth
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glBindTexture(GL_TEXTURE_2D, texIdEarth);
glTranslatef(planet[0], planet[1], depth-3.0);
glRotatef(25.0f, 0.0f, 0.0f, 1.0f);
glRotatef(-90, 1.0f, 0.0f, 0.0f);
glRotatef(ticks, 0.0f, 0.0f, 1.0f);
ticks += .005;
if(ticks > 360.0f)ticks = 0.0f;
gluSphere(earth, planet[2]*1.65f, 200, 200);
glPopMatrix();
//Draw the clouds
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_COLOR, GL_DST_COLOR);
glPushMatrix();
glBindTexture(GL_TEXTURE_2D, texIdClouds);
glLoadIdentity();
glTranslatef(planet[0], planet[1], depth-3.0);
glRotatef(25.0f, 0.0f, 0.0f, 1.0f);
glRotatef(-90, 1.0f, 0.0f, 0.0f);
glRotatef(ticks, 1.0f, 0.0f, 1.0f);
gluSphere(clouds, planet[2]*1.652f, 200, 200);
glPopMatrix();
// Reset somethings for the rest of the scene
glDisable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// top player (player 1) paddle
drawPaddle(paddleA, depth+5.0f);
// bottom player (player 2) paddle
drawPaddle(paddleB, depth+5.0f);
glDisable(GL_BLEND);
// ball
glEnable(GL_LIGHTING);
glColor3fv(ball.color);
glPushMatrix();
glTranslatef(ball.xpos, ball.ypos, depth+4.0f);
glutSolidSphere(ball.radius, 100, 100);
glPopMatrix();
/* If DGR is enabled, only do this in the master*/
if(dgr_is_enabled() == 0 || dgr_is_master())
{
// Run the game code
game();
}
glFlush();
glutSwapBuffers();
glutPostRedisplay(); // call display() repeatedly
}
int main( int argc, char* argv[] )
{
/* Initialize glut */
glutInit(&argc, argv); //initialize the toolkit
glEnable(GL_POINT_SMOOTH);
glutSetOption(GLUT_MULTISAMPLE, 4); // set msaa samples; default to 4
/* Ask GLUT to for a double buffered, full color window that includes a depth buffer */
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_MULTISAMPLE); //set display mode
glutInitWindowSize(768, 512); //set window size
glutInitWindowPosition(0, 0); //set window position on screen
glutCreateWindow(argv[0]); //open the screen window
glEnable(GL_MULTISAMPLE);
/* Initialize glew */
int glew_err = glewInit();
if(glew_err != GLEW_OK)
fprintf(stderr, "GLEW Error: %s\n", glewGetErrorString(glew_err));
/* Initialize call backs */
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
/* Initialize DGR */
dgr_init(); /* Initialize DGR based on environment variables. */
projmat_init(); /* Figure out which projection matrix we should use based on environment variables */
float frustum[6]; // left, right, bottom, top, near, far
// 0 1 2 3 4 5
projmat_get_frustum(frustum, -1, -1);
ball.xpos = (frustum[0] + frustum[1])/2.0;
ball.ypos = (frustum[2] + frustum[3])/2.0;
ball.speed = ball.minSpeed = (frustum[3]-frustum[2]) / 178.462f;
paddleA.xpos = ball.xpos;
paddleA.ypos = frustum[3]-(frustum[3]-frustum[2])/20.0;
paddleA.width = (frustum[1]-frustum[0])/10.0;
paddleA.increment = paddleA.width / 3.0;
paddleA.thickness = (frustum[3]-frustum[2])/25.0;
paddleB.xpos = paddleA.xpos;
paddleB.ypos = frustum[2]+(frustum[3]-frustum[2])/20.0;
paddleB.width = paddleA.width;
paddleB.increment = paddleA.increment;
paddleB.thickness = -paddleA.thickness;
msg(INFO, "Initial ball position %f %f\n", ball.xpos, ball.ypos);
msg(INFO, "Initial Ball speed: %f\n", frustum[3]-frustum[2], ball.speed);
msg(INFO, "Initial paddle A position %f %f\n", paddleA.xpos, paddleA.ypos);
msg(INFO, "Initial paddle B position %f %f\n", paddleB.xpos, paddleB.ypos);
ball.radius = (frustum[1]-frustum[0])/50.0;
planet[0] = ((frustum[0] + frustum[1])/2.0f) - ((frustum[1] - frustum[0])/2.4f);
planet[1] = ((frustum[2] + frustum[3])/2.0f) - ((frustum[1] - frustum[0])*1.7f);
planet[2] = (frustum[1] - frustum[0]);
earth = gluNewQuadric();
clouds = gluNewQuadric();
gluQuadricDrawStyle(earth, GLU_FILL);
gluQuadricTexture(earth, GL_TRUE);
gluQuadricNormals(earth, GLU_SMOOTH);
gluQuadricDrawStyle(clouds, GLU_FILL);
gluQuadricTexture(clouds, GL_TRUE);
gluQuadricNormals(clouds, GLU_SMOOTH);
kuhl_read_texture_file(EARTH, &texIdEarth);
kuhl_read_texture_file(CLOUDS, &texIdClouds);
kuhl_read_texture_file(STARS, &texIdStars);
glutMainLoop();
}
void game()
{
float frustum[6];
projmat_get_frustum(frustum, -1, -1);
if(USE_VRPN)
{
vrpn_get(TRACKED_OBJ_A, NULL, vrpnPos, vrpnOrient);
paddleA.xpos = vrpnPos[0];
if(vrpnPos[1] <= .5)
paddleA.ready = true;
vrpn_get(TRACKED_OBJ_B, NULL, vrpnPos, vrpnOrient);
paddleB.xpos = vrpnPos[0];
if(vrpnPos[1] <= .5)
paddleB.ready = true;
}
//Preform the action based on the game state
switch(gameState)
{
//This state indicates that atleast one player is not ready
case GS_WAITING:
//When both players are ready, shift to the ready state
if(paddleA.ready && paddleB.ready)
{
startTime = time(NULL);
gameState = GS_READY;
}
else
{
// Reset the ball to it's starting state
ball.xpos = (frustum[0]+frustum[1])/2.0;
ball.ypos = (frustum[2]+frustum[3])/2.0;
ball.xdir = 0;
ball.ydir = 0;
ball.color[0] = ball.baseColor[0];
ball.color[1] = ball.baseColor[1];
ball.color[2] = ball.baseColor[2];
}
break;
//This state indicates that both players are ready to play
case GS_READY:
//We should wait in this state for 2 seconds
if(time(NULL)-startTime >= 2)
{
//Start the ball moving either up or down.
srand48(startTime);
ball.ydir = 1;
if(drand48() < .5)
ball.ydir = -1;
gameState = GS_PLAYING;
}
break;
//This state indicates that the game is currently being played
case GS_PLAYING:
// Move the ball
ball.xpos += ball.xdir * ball.speed;
ball.ypos += ball.ydir * ball.speed;
//Make sure the ball has not slowed down too much
if(ball.speed < ball.minSpeed)
{
ball.speed = ball.minSpeed;
}
bool isBounce = false;
//Handle the sides of the play area
if(ball.xpos-ball.radius < frustum[0]) // left wall
{
ball.xpos = frustum[0]+ball.radius;
ball.xdir = -ball.xdir;
isBounce = true;
}
if(ball.xpos+ball.radius > frustum[1]) // right wall
{
ball.xpos = frustum[1]-ball.radius;
ball.xdir = -ball.xdir;
isBounce = true;
}
// Handle the Top and the bottom of the play area
if(ball.ypos > frustum[3] || ball.ypos < frustum[2]) // top orr bottom wall
{
gameState = GS_SCORED;
break;
}
// check for player 1 (top) paddle hit
if(ball.ypos > paddleA.ypos-ball.radius && ball.ydir > 0)
{
// if we hit paddle
if(ball.xpos+ball.radius*.9 > paddleA.xpos-paddleA.width/2 &&
ball.xpos-ball.radius*.9 < paddleA.xpos+paddleA.width/2)
{
ball.ypos = paddleA.ypos-ball.radius;
ball.ydir = -ball.ydir;
isBounce = true;
ball.bounceCount++;
}
}
// check for player 2 (bottom) paddle hit
if(ball.ypos < paddleB.ypos+ball.radius && ball.ydir < 0)
{
// if we hit paddle
if(ball.xpos+ball.radius*.9 > paddleB.xpos-paddleB.width/2 &&
ball.xpos-ball.radius*.9 < paddleB.xpos+paddleB.width/2)
{
ball.ypos = paddleB.ypos+ball.radius;
ball.ydir = -ball.ydir;
isBounce = true;
ball.bounceCount++;
}
}
// speedup the ball periodically
if(ball.bounceCount == ball.speedUp)
{
ball.bounceCount = 0;
ball.speed = ball.speed / .7; // speed up
ball.speedUp++;
ball.color[0] = ball.fastColor[0];
ball.color[1] = ball.fastColor[1];
ball.color[2] = ball.fastColor[2];
}
else // If a speedup didn't happen, make the ball more green
{
float step = (float)ball.bounceCount / ((float)ball.speedUp-1);
ball.color[0] = ball.baseColor[0] + ((ball.fastColor[0] - ball.baseColor[0]) * step);
ball.color[1] = ball.baseColor[1] + ((ball.fastColor[1] - ball.baseColor[1]) * step);
ball.color[2] = ball.baseColor[2] + ((ball.fastColor[2] - ball.baseColor[2]) * step);
}
// add noise to bounces so they don't bounce perfectly.
if(isBounce)
{
// add more noise as game speeds up.
int scale = ball.speedUp;
if(scale > 3)
scale = 3;
double newXdir;
double newYdir;
do
{
newXdir = ball.xdir + (drand48()-.5) / 8.0 * scale;
newYdir = ball.ydir + (drand48()-.5) / 8.0 * scale;
// normalize direction vector
float dirLength = sqrtf(newXdir*newXdir + newYdir*newYdir);
newXdir /= dirLength;
newYdir /= dirLength;
// Keep trying new values until we find something that
// isn't moving too much left/right. Also, force bounces
// to keep the ball bouncing in the same direction
// vertically.
} while(fabs(newYdir) < .2 || ball.ydir * newYdir < 0);
ball.xdir = newXdir;
ball.ydir = newYdir;
}
break;
//This state indicates that one player just scored
case GS_SCORED:
//Reset the bounce count, then figure out who scored
ball.bounceCount = 0;
bool paddleAScored = (ball.ypos < frustum[2]);
//Change the paddle widths based on who scored
paddleA.width += paddleA.increment * (paddleAScored ? 1 :-1);
paddleB.width += paddleB.increment * (paddleAScored ? -1 :1);
if(paddleA.width < 0.001 || paddleB.width < 0.001)//Check if some one lost the game
{
msg(WARNING, "%s Player wins!\n", (paddleAScored ? "Red" : "Blue"));
//Reset the paddles for the next game
paddleA.width = paddleB.width = (frustum[1]-frustum[0])/10.0;
//Reset the ball for the next game
ball.speed = ball.minSpeed = (frustum[3]-frustum[2]) / 178.462f;
ball.speedUp = ball.baseSpeedUp;
}
else // Only lost the point, not the game;
{
ball.speed *= .7; // slow down
ball.speedUp--;
}
//Set the players to not ready and transition to the waiting state
paddleA.ready = paddleB.ready = false;
gameState = GS_WAITING;
break;
}
}
void display()
{
dgr_update();
dgr_setget("style", &renderStyle, sizeof(int));
// Clear the screen to black, clear the depth buffer
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST); // turn on depth testing
kuhl_errorcheck();
/* Turn on blending (note, if you are using transparent textures,
the transparency may not look correct unless you draw further
items before closer items.). */
glEnable(GL_BLEND);
glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD);
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO);
/* Render the scene once for each viewport. Frequently one
* viewport will fill the entire screen. However, this loop will
* run twice for HMDs (once for the left eye and once for the
* right. */
for(int viewportID=0; viewportID<viewmat_num_viewports(); viewportID++)
{
/* Where is the viewport that we are drawing onto and what is its size? */
int viewport[4]; // x,y of lower left corner, width, height
viewmat_get_viewport(viewport, viewportID);
glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
/* Get the frustum information which will be later used to generate a perspective projection matrix. */
float f[6]; // left, right, top, bottom, near>0, far>0
projmat_get_frustum(f, viewport[2], viewport[3]);
/* Get the view or camera matrix; update the frustum values if needed. */
float viewMat[16];
viewmat_get(viewMat, f, viewportID);
glUseProgram(program);
/* Communicate matricies to OpenGL */
float perspective[16];
mat4f_frustum_new(perspective,f[0], f[1], f[2], f[3], f[4], f[5]);
glUniformMatrix4fv(kuhl_get_uniform("Projection"),
1, // count
0, // transpose
perspective); // value
float modelMat[16];
get_model_matrix(modelMat);
// modelview = view * model
float modelview[16];
mat4f_mult_mat4f_new(modelview, viewMat, modelMat);
glUniformMatrix4fv(kuhl_get_uniform("ModelView"),
1, // count
0, // transpose
modelview); // value
glUniform1i(kuhl_get_uniform("renderStyle"), renderStyle);
// Copy far plane value into vertex program so we can render depth buffer.
glUniform1f(kuhl_get_uniform("farPlane"), f[5]);
kuhl_errorcheck();
kuhl_draw_model_file_ogl3(modelFilename, modelTexturePath, program);
kuhl_errorcheck();
glUseProgram(0); // stop using a GLSL program.
} // finish viewport loop
int time = glutGet(GLUT_ELAPSED_TIME);
float fps = kuhl_getfps(time);
if(time % 1000 == 0)
printf("Frames per second: %0.1f\n", fps);
/* Check for errors. If there are errors, consider adding more
* calls to kuhl_errorcheck() in your code. */
kuhl_errorcheck();
glFlush();
glFinish();
/* Display the buffer we just drew (necessary for double buffering). */
glutSwapBuffers();
// kuhl_video_record("videoout", 30);
/* Ask GLUT to call display() again. We shouldn't call display()
* ourselves recursively because it will not leave time for GLUT
* to call other callback functions for when a key is pressed, the
* window is resized, etc. */
glutPostRedisplay();
}
void display(void)
{
kuhl_limitfps(100);
dgr_update();
// Make sure slaves get updates ASAP
dgr_setget("currentTex", ¤tTexture, sizeof(int));
/* If the texture has changed since we were previously in display() */
if(alreadyDisplayedTexture != currentTexture)
{
// Load the new texture
loadTexture(currentTexture);
// Keep a record of which texture we are currently displaying
// so we can detect when DGR changes currentTexture on a
// slave.
alreadyDisplayedTexture = currentTexture;
}
/* The view frustum is an orthographic frustum for this
* application. The size of the frustum doesn't matter much, but
* the aspect ratio of the frustum should match the aspect ratio
* of the screen/window. */
float frustum[6], masterFrustum[6];
/* The following two methods will get the master view frustum and
* the current process view frustum. If we are running in a
* standalone version, these two frustums will be the same. */
projmat_get_master_frustum(masterFrustum);
projmat_get_frustum(frustum, -1, -1); // frustum of this process (master or slave)
/* Set this view frustum for this process. */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(frustum[0],frustum[1],
frustum[2],frustum[3],
-1, 1);
glMatrixMode(GL_MODELVIEW);
// Middle of master frustum in the vertical direction. It divides the top
// tiles from the bottom tiles.
float masterFrustumMid = (masterFrustum[2]+masterFrustum[3])/2;
// Dimensions of the master view frustum
float masterFrustumWidth = masterFrustum[1]-masterFrustum[0];
float masterFrustumHeight = masterFrustum[3]-masterFrustum[2];
// The width of the quad (in frustum units). Since the image will
// be stretched to fit the screen vertically, and our units are in
// frustum units, the width of the tile is the height of the
// frustum times the aspect ratio divided by the number of tiles
// in the horizontal direction.
float quadWidth = aspectRatio * masterFrustumHeight;
float tileWidth = quadWidth/numTiles;
// TODO: Maybe just scale the image vertically if the image almost fits in the screen horizontally?
int msSincePictureDisplayed = glutGet(GLUT_ELAPSED_TIME)-lastAdvance;
int scrollStatus = 0; // 0=don't need to scroll or done scrolling, 1=currently scrolling
if(masterFrustumWidth < quadWidth)// do we need to scroll on this image
{
// Do we still need to scroll?
if(scrollAmount < quadWidth-masterFrustumWidth)
scrollStatus = 1;
if(scrollStatus == 1)
{
// Wait a few seconds before scrolling. It takes a while
// for all slaves on IVS to get the images.
if(msSincePictureDisplayed > 5000)
scrollAmount = ((msSincePictureDisplayed-5000) / (SCROLL_SPEED*1000.0))*masterFrustumWidth;
else
scrollAmount = 0;
// If we calculated the scroll amount to be the largest
// scrollAmount we'll need
if(scrollAmount > quadWidth-masterFrustumWidth)
{
// dwell at the end of the image even if autoadvance is on.
int now = glutGet(GLUT_ELAPSED_TIME);
// make sure we still have a few seconds before advancing
if(SLIDESHOW_WAIT*1000-(now-lastAdvance) < 3000)
{
// Go back and set lastAdvance time so we have
// some time to dwell here.
lastAdvance = now-SLIDESHOW_WAIT*1000+3000;
}
}
}
}
dgr_setget("scrollAmount", &scrollAmount, sizeof(float));
/* If autoadvance is set and we are not scrolling (or done
* scrolling) figure out if it is now time to advance to the next
* image. */
if(autoAdvance == 1 && scrollStatus != 1)
{
// printf("time since last advance %d\n", glutGet(GLUT_ELAPSED_TIME)-lastAdvance);
if(glutGet(GLUT_ELAPSED_TIME)-lastAdvance > SLIDESHOW_WAIT*1000) // time to show new image:
{
currentTexture = getNextTexture();
loadTexture(currentTexture);
return;
}
}
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
glColor3f(1,1,1); // color of quad
// Draw the top and bottom quad for each of the tiles going across the screen horizontally. */
for(GLuint i=0; i<numTiles*2; i=i+2)
{
float tileLeft = (i/2 )*tileWidth + masterFrustum[0];
float tileRight = (i/2+1)*tileWidth + masterFrustum[0];
// Draw bottom tile
glBindTexture(GL_TEXTURE_2D, texNames[i]);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex2d(tileLeft -scrollAmount, masterFrustum[2]); // lower left
glTexCoord2f(1.0, 0.0); glVertex2d(tileRight-scrollAmount, masterFrustum[2]); // lower right
glTexCoord2f(1.0, 1.0); glVertex2d(tileRight-scrollAmount, masterFrustumMid); // upper right
glTexCoord2f(0.0, 1.0); glVertex2d(tileLeft -scrollAmount, masterFrustumMid); // upper left
glEnd();
// Draw top tile
glBindTexture(GL_TEXTURE_2D, texNames[i+1]);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex2d(tileLeft -scrollAmount, masterFrustumMid); // lower left
glTexCoord2f(1.0, 0.0); glVertex2d(tileRight-scrollAmount, masterFrustumMid); // lower right
glTexCoord2f(1.0, 1.0); glVertex2d(tileRight-scrollAmount, masterFrustum[3]); // upper right
glTexCoord2f(0.0, 1.0); glVertex2d(tileLeft -scrollAmount, masterFrustum[3]); // upper left
glEnd();
}
glDisable(GL_TEXTURE_2D);
/* Draw filename label on top of a quad. */
glColor4f(0,0,0,.3);
glBegin(GL_QUADS);
glVertex2d(-1,-1);
glVertex2d(-.5,-1);
glVertex2d(-.5,-.96);
glVertex2d(-1,-.96);
glEnd();
glColor4f(1,1,1,.9);
glRasterPos2f(-.98,-.98);
void *font = GLUT_BITMAP_TIMES_ROMAN_24;
char *str = globalargv[currentTexture];
for(GLuint i=0; i<strlen(str); i++)
glutBitmapCharacter(font, str[i]);
/* Flush and swap the OpenGL buffers. */
glFlush();
glutSwapBuffers();
glutPostRedisplay();
}
/** Get a 4x4 view matrix. Some types of systems also need to update
* the frustum based on where the virtual camera is. For example, on
* the IVS display wall, the frustum is adjusted dynamically based on
* where a person is relative to the screens.
*
* @param viewmatrix A 4x4 view matrix for viewmat to fill in.
*
* @param projmatrix A 4x4 projection matrix for viewmat to fill in.
*
* @param viewportID If there is only one viewport, set this to
* 0. This value must be smaller than the value reported by
* viewmat_num_viewports(). In an HMD, typically viewportID=0 is the
* left eye and viewportID=1 is the right eye. However, some Oculus
* HMDs will result in this being swapped. To definitively know which
* eye this view matrix corresponds to, examine the return value of
* this function.
*
* @return A viewmat_eye enum which indicates if this view matrix is
* for the left, right, middle, or unknown eye.
*
*/
viewmat_eye viewmat_get(float viewmatrix[16], float projmatrix[16], int viewportID)
{
viewmat_eye eye = viewmat_viewport_to_eye(viewportID);
int viewport[4]; // x,y of lower left corner, width, height
viewmat_get_viewport(viewport, viewportID);
/* Get the view or camera matrix; update the frustum values if needed. */
float f[6]; // left, right, bottom, top, near>0, far>0
projmat_get_frustum(f, viewport[2], viewport[3], viewportID);
/* If we are running in IVS mode and using the tracking systems,
* all computers need to update their frustum differently. The
* master process will be controlled by VRPN, and all slaves will
* have their controllers set to "none". Here, we detect for this
* situation and make sure all processes work correctly.
*/
if(viewmat_display_mode == VIEWMAT_IVS &&
viewmat_control_mode == VIEWMAT_CONTROL_VRPN)
{
// Will update view matrix and frustum information
viewmat_get_ivs(viewmatrix, f);
mat4f_frustum_new(projmatrix, f[0], f[1], f[2], f[3], f[4], f[5]);
}
else
{
switch(viewmat_control_mode)
{
case VIEWMAT_CONTROL_MOUSE: // mouse movement
viewmat_get_mouse(viewmatrix, viewportID);
mat4f_frustum_new(projmatrix, f[0], f[1], f[2], f[3], f[4], f[5]);
break;
case VIEWMAT_CONTROL_NONE:
// Get the view matrix from the mouse movement code...but
// we haven't registered mouse movement callback
// functions, so mouse movement won't work.
viewmat_get_mouse(viewmatrix, viewportID);
mat4f_frustum_new(projmatrix, f[0], f[1], f[2], f[3], f[4], f[5]);
break;
case VIEWMAT_CONTROL_ORIENT:
viewmat_get_orient_sensor(viewmatrix, viewportID);
mat4f_frustum_new(projmatrix, f[0], f[1], f[2], f[3], f[4], f[5]);
break;
case VIEWMAT_CONTROL_OCULUS:
viewmat_get_hmd_oculus(viewmatrix, projmatrix, viewportID);
// previous function sets projmatrix for us...
break;
case VIEWMAT_CONTROL_VRPN:
viewmat_get_vrpn(viewmatrix, viewportID);
mat4f_frustum_new(projmatrix, f[0], f[1], f[2], f[3], f[4], f[5]);
break;
default:
msg(MSG_FATAL, "Unknown viewmat control mode: %d\n", viewmat_control_mode);
exit(EXIT_FAILURE);
}
}
/* Send the view matrix to DGR. At some point in the future, we
* may have multiple computers using different view matrices. For
* now, even in IVS mode, all processes will use the same view
* matrix (IVS uses different view frustums per process). */
char dgrkey[128];
snprintf(dgrkey, 128, "!!viewmat%d", viewportID);
dgr_setget(dgrkey, viewmatrix, sizeof(float)*16);
/* Sanity checks */
viewmat_validate_ipd(viewmatrix, viewportID);
return eye;
}
/* Called by GLUT whenever the window needs to be redrawn. This
* function should not be called directly by the programmer. Instead,
* we can call glutPostRedisplay() to request that GLUT call display()
* at some point. */
void display()
{
/* If we are using DGR, send or receive data to keep multiple
* processes/computers synchronized. */
dgr_update();
dgr_setget("style", &renderStyle, sizeof(int));
/* Render the scene once for each viewport. Frequently one
* viewport will fill the entire screen. However, this loop will
* run twice for HMDs (once for the left eye and once for the
* right. */
viewmat_begin_frame();
for(int viewportID=0; viewportID<viewmat_num_viewports(); viewportID++)
{
viewmat_begin_eye(viewportID);
/* Where is the viewport that we are drawing onto and what is its size? */
int viewport[4]; // x,y of lower left corner, width, height
viewmat_get_viewport(viewport, viewportID);
glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
/* Clear the current viewport. Without glScissor(), glClear()
* clears the entire screen. We could call glClear() before
* this viewport loop---but on order for all variations of
* this code to work (Oculus support, etc), we can only draw
* after viewmat_begin_eye(). */
glScissor(viewport[0], viewport[1], viewport[2], viewport[3]);
glEnable(GL_SCISSOR_TEST);
glClearColor(.2,.2,.2,0); // set clear color to grey
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glDisable(GL_SCISSOR_TEST);
glEnable(GL_DEPTH_TEST); // turn on depth testing
kuhl_errorcheck();
/* Turn on blending (note, if you are using transparent textures,
the transparency may not look correct unless you draw further
items before closer items.). */
glEnable(GL_BLEND);
glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD);
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO);
/* Get the view or camera matrix; update the frustum values if needed. */
float viewMat[16], perspective[16];
viewmat_get(viewMat, perspective, viewportID);
glUseProgram(program);
kuhl_errorcheck();
/* Send the perspective projection matrix to the vertex program. */
glUniformMatrix4fv(kuhl_get_uniform("Projection"),
1, // number of 4x4 float matrices
0, // transpose
perspective); // value
float modelMat[16];
get_model_matrix(modelMat);
float modelview[16];
mat4f_mult_mat4f_new(modelview, viewMat, modelMat); // modelview = view * model
/* Send the modelview matrix to the vertex program. */
glUniformMatrix4fv(kuhl_get_uniform("ModelView"),
1, // number of 4x4 float matrices
0, // transpose
modelview); // value
glUniform1i(kuhl_get_uniform("renderStyle"), renderStyle);
// Copy far plane value into vertex program so we can render depth buffer.
float f[6]; // left, right, bottom, top, near>0, far>0
projmat_get_frustum(f, viewport[2], viewport[3]);
glUniform1f(kuhl_get_uniform("farPlane"), f[5]);
kuhl_errorcheck();
kuhl_limitfps(60);
update();
kuhl_geometry_draw(modelgeom); /* Draw the model */
kuhl_errorcheck();
glUseProgram(0); // stop using a GLSL program.
} // finish viewport loop
viewmat_end_frame();
/* Check for errors. If there are errors, consider adding more
* calls to kuhl_errorcheck() in your code. */
kuhl_errorcheck();
// kuhl_video_record("videoout", 30);
/* Ask GLUT to call display() again. We shouldn't call display()
* ourselves recursively because it will not leave time for GLUT
* to call other callback functions for when a key is pressed, the
* window is resized, etc. */
glutPostRedisplay();
}