void Display()
// Display function.
{
// Turn on z-buffering.
glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH_TEST);
// Set up the view matrix.
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
matrix ViewMatrix;
ViewMatrix.View(ViewerDir, ViewerUp, ViewerLoc);
OGLViewMatrix(ViewMatrix);
// Transform the frustum planes from view coords into world coords.
int i;
for (i = 0; i < 6; i++) {
// Rotate the plane from view coords into world coords. I'm pretty sure this is not a slick
// way to do this :)
PlaneInfo& tp = TransformedFrustumPlane[i];
PlaneInfo& p = FrustumPlane[i];
ViewMatrix.ApplyInverseRotation(&tp.Normal, p.Normal);
vector v;
ViewMatrix.ApplyInverse(&v, p.Normal * p.D);
tp.D = v * tp.Normal;
}
// Clear buffers.
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw the quadtree.
if (root) {
root->Update(RootCornerData, (const float*) ViewerLoc, Detail);
TriangleCounter += root->Render(RootCornerData, Textured);
}
// Show frame.
glutSwapBuffers();
}
void Update()
// Runs one iteration of the game loop.
{
CurrentTicks = Timer::GetTicks() - StartTicks;
int DeltaTicks = CurrentTicks - LastTicks;
// Force DeltaTicks to a fixed value if we're making a movie.
if (Config::GetValue("RecordMoviePath") /*&& Config::GetBool("RecordMoviePause") == false*/ ) {
DeltaTicks = 33;
if (MovieFrameNumber % 3 == 0) DeltaTicks++; // Exactly 30 frames/sec.
// Monkey with the time base so that CurrentTicks
// increments at 30 frames/sec in sync with DeltaTicks.
// This is so code which samples CurrentTicks will behave
// properly during movie recording.
CurrentTicks = LastTicks + DeltaTicks;
// StartTicks = (Timer::GetTicks() - CurrentTicks);
}
if (MovieMode == true) {
LastTicks = CurrentTicks;
if (DeltaTicks > 200) DeltaTicks = 200;
//
// Movie mode.
//
// Don't do world update and rendering. Just show the movie, until
// it's done, or until the user escapes past the movie.
// Check for user escape.
int UpdateCount = 0; // For protection against update functions taking longer than the sampling period.
UpdateState u;
while (UpdatesPending() && UpdateCount++ < 30) {
GetNextUpdateState(&u);
}
if (Input::CheckForEventDown(Input::BUTTON0) ||
Input::CheckForEventDown(Input::ENTER) ||
Input::CheckForEventDown(Input::ESCAPE) ||
Input::CheckForEventDown(Input::BUTTON2) ||
Config::GetBoolValue("SkipIntro"))
{
// Cut the movie short.
MovieDuration = 0;
}
Input::EndFrameNotify();
// Show a new frame.
glViewport(0, 0, Render::GetWindowWidth(), Render::GetWindowHeight());
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (MoviePlayer) MoviePlayer->play(DeltaTicks);
if (Config::GetValue("RecordMoviePath")) SaveMovieFrame();
Render::ShowFrame();
MovieDuration -= DeltaTicks;
if (MovieDuration <= 0) {
// Done with the movie, now exit movie mode.
MovieDuration = 0;
if (MoviePlayer) {
MoviePlayer->unRef();
MoviePlayer = NULL;
}
MovieMode = false;
}
// Sleep a little.
int SleepTime = 13 - DeltaTicks;
if (SleepTime > 0) {
Timer::Sleep(SleepTime);
}
return;
}
//
// Update the game logic & physics.
//
UpdateState u;
if (Config::GetValue("RecordMoviePath") != NULL) {
// Special case -- simulate a fixed update rate.
// Consume input.
do {
GetNextUpdateState(&u);
} while (UpdatesPending());
u.DeltaTicks = DeltaTicks; // Force frame time.
u.Ticks = CurrentTicks;
DoUpdates(u);
} else {
// Normal case -- consume input info and update in real-time.
int UpdateCount = 0; // For protection against update functions taking longer than the sampling period.
while (UpdatesPending() && UpdateCount++ < 30) {
GetNextUpdateState(&u);
DoUpdates(u);
}
if (!Config::GetBoolValue("LimitUpdateRate")) {
UpdateCount++;
GetNextUpdateState(&u);
//xxxxxx
Config::SetBoolValue("LastUpdateBeforeRender", true);
//xxxxx
DoUpdates(u);
} else {
if (UpdateCount) {
Config::SetBoolValue("LastUpdateBeforeRender", true);
}
}
if (UpdateCount == 0) {
return;
}
}
LastTicks = CurrentTicks;
// Don't try to render if we've entered movie mode during the updates.
if (MovieMode) return;
// Don't render if we're about to quit.
if (Main::GetQuit()) return;
// Render visuals.
int number_of_players = MultiPlayer::NumberOfLocalPlayers();
int window_corner_x[4];
int window_corner_y[4];
int window_size_x[4];
int window_size_y[4];
SetWindowCoordinates(number_of_players, window_corner_x, window_corner_y, window_size_x, window_size_y);
// For each player, draw graphics
for (int player_index = 0; player_index < number_of_players; player_index++){
MultiPlayer::SetCurrentPlayerIndex(player_index);
ViewState s;
// Increment the frame number.
//if (player_index == 0)
FrameNumber++;
s.FrameNumber = FrameNumber;
// Set the time value.
s.Ticks = u.Ticks;
float ViewAngle = Config::GetFloatValue("ViewAngle") * (PI / 180);
// Get viewer orientation.
vec3 ViewerDir = XAxis;
vec3 ViewerUp = YAxis;
vec3 ViewerLoc = ZeroVector;
if (Viewer) {
ViewerDir = Viewer->GetDirection();
ViewerUp = Viewer->GetUp();
ViewerLoc = Viewer->GetLocation();
if (ViewerDir.checknan() || ViewerUp.checknan()) {
// Trouble. Fall back to a default orientation.
ViewerDir = XAxis;
ViewerUp = YAxis;
}
if (ViewerLoc.checknan()) {
// Trouble. Fall back to a default location.
ViewerLoc = ZeroVector;
}
}
// Establish transformation from world coordinates to view coordinates.
s.CameraMatrix.View(ViewerDir, ViewerUp, ViewerLoc);
s.ViewMatrix = s.CameraMatrix;
s.Viewpoint = ViewerLoc;
s.MinZ = 1;
s.MaxZ = Z_MAX;
s.OneOverMaxZMinusMinZ = 1.0f / (s.MaxZ - s.MinZ);
// Set the clipping planes.
// s.ClipPlaneCount = 0;
// Near.
s.ClipPlane[0].Normal = ZAxis;
s.ClipPlane[0].D = s.MinZ;
// s.ClipPlaneCount++;
// Left.
s.ClipPlane[1].Normal = vec3(-cosf(ViewAngle/2), 0, sinf(ViewAngle/2));
s.ClipPlane[1].D = 0;
// s.ClipPlaneCount++;
// Right.
s.ClipPlane[2].Normal = vec3(cosf(ViewAngle/2), 0, sinf(ViewAngle/2));
s.ClipPlane[2].D = 0;
// s.ClipPlaneCount++;
// float AspectRatio = float(Render::GetWindowHeight()) / float(Render::GetWindowWidth() * 2.0); // Bjorn
// float VerticalAngle2 = atanf(tanf(ViewAngle/2) * AspectRatio);
float AspectRatio = float(window_size_y[player_index]) / float(window_size_x[player_index]); // Bjorn
float VerticalAngle2 = atanf(tanf(ViewAngle/2) * AspectRatio);
// Top.
s.ClipPlane[3].Normal = vec3(0, -cosf(VerticalAngle2), sinf(VerticalAngle2));
s.ClipPlane[3].D = 0;
// s.ClipPlaneCount++;
// Bottom.
s.ClipPlane[4].Normal = vec3(0, cosf(VerticalAngle2), sinf(VerticalAngle2));
s.ClipPlane[4].D = 0;
// s.ClipPlaneCount++;
// Far.
s.ClipPlane[5].Normal = -ZAxis;
s.ClipPlane[5].D = -s.MaxZ;
// s.ClipPlaneCount++;
// Set the projection factors so the view volume fills the screen.
s.XProjectionFactor = (Render::GetWindowWidth() - 0.6f) / 2 / tanf(ViewAngle/2);
s.YProjectionFactor = s.XProjectionFactor;
// Set the x/y offsets so that 0,0 appears in the middle of the screen.
s.XOffset = (Render::GetWindowWidth() + 1) * 0.5f;
s.YOffset = (Render::GetWindowHeight() + 1) * 0.5f;
// Only clear the screen the first time each frame
if (player_index == 0){
Render::BeginFrame();
Render::ClearFrame();
}
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
// Set the viewport (split the screen)
glViewport(window_corner_x[player_index],
window_corner_y[player_index],
window_size_x[player_index],
window_size_y[player_index]);
// Set up OpenGL matrices.
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float w = 2 * s.MinZ * tanf(ViewAngle/2);
float h = w * AspectRatio;
OGLFrustum(w, h, s.MinZ, s.MaxZ);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
OGLViewMatrix(ViewerDir, ViewerUp, ViewerLoc);
// Update the terrain.
TerrainMesh::Update(s);
// Set up fog parameters.
if (Config::GetBoolValue("Fog")) {
glEnable(GL_FOG);
glFogi(GL_FOG_MODE, GL_LINEAR /* GL_EXP */);
glFogf(GL_FOG_START, 0);
glFogf(GL_FOG_END, Weather::GetFadeDistance()); // For GL_LINEAR mode.
// glFogf(GL_FOG_DENSITY, 4.852 / Weather::GetFadeDistance()); // For GL_EXP mode; meaningless for GL_LINEAR mode.
glHint(GL_FOG_HINT, GL_NICEST);
glFogfv(GL_FOG_COLOR, Weather::GetFadeColor());
}
// Determine far clipping plane, and decide whether or not to do two passes.
float MaxZ = fmin(Z_MAX, Weather::GetFadeDistance());
bool TwoPass = true; // Should set to false if we have a 24- or 32-bit z-buffer...
if (MaxZ < TWO_PASS_CUTOFF) TwoPass = false;
if (TwoPass && Config::GetBoolValue("ZSinglePass")) TwoPass = false; // Manual override, force single pass.
float MidZ = MaxZ;
if (TwoPass) {
//
// Draw the distant part of the world.
//
// Pick a z value to separate the near and far passes, in order to optimize z-buffer usage.
MidZ = sqrtf(Z_MIN * Z_MAX);
s.MaxZ = MaxZ;
s.MinZ = MidZ * 0.9f;
s.OneOverMaxZMinusMinZ = 1.0f / (s.MaxZ - s.MinZ);
// Near.
s.ClipPlane[0].Normal = ZAxis;
s.ClipPlane[0].D = s.MinZ;
// Far.
s.ClipPlane[5].Normal = -ZAxis;
s.ClipPlane[5].D = -s.MaxZ;
// Set up OpenGL matrices.
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
w = 2 * s.MinZ * tanf(ViewAngle/2);
h = w * AspectRatio;
OGLFrustum(w, h, s.MinZ, s.MaxZ);
glMatrixMode(GL_MODELVIEW);
// glLoadIdentity();
// OGLViewMatrix(Viewer->GetDirection(), Viewer->GetUp(), Viewer->GetLocation());
// Bjorn : moved this for sky to work when having two players
// Draw a backdrop.
glDisable(GL_FOG);
Weather::RenderBackdrop(s);
TerrainMesh::Render(s);
Model::Render(s);
}
//
// Draw closer part of terrain.
//
Render::ClearZBuffer();
s.MaxZ = MidZ;
s.MinZ = Z_MIN;
s.OneOverMaxZMinusMinZ = 1.0f / (s.MaxZ - s.MinZ);
// Near.
s.ClipPlane[0].Normal = ZAxis;
s.ClipPlane[0].D = s.MinZ;
// Far.
s.ClipPlane[5].Normal = -ZAxis;
s.ClipPlane[5].D = -s.MaxZ;
// Set up OpenGL matrices.
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
w = 2 * s.MinZ * tanf(ViewAngle/2);
h = w * AspectRatio;
OGLFrustum(w, h, s.MinZ, s.MaxZ);
glMatrixMode(GL_MODELVIEW);
// glLoadIdentity();
// OGLViewMatrix(Viewer->GetDirection(), Viewer->GetUp(), Viewer->GetLocation());
TerrainMesh::Render(s);
// Draw the objects.
Model::Render(s);
//
// Overlay effects.
//
// Turn off the fog for overlay stuff.
glDisable(GL_FOG);
if (Config::GetBoolValue("BoarderShadow")) {
// Draw boarder shadow.
Boarder::RenderShadow(s);
}
// Draw a trail in the snow.
// Trail::Render(s);
// Draw ballistic particles.
Particle::Render(s);
// Draw weather overlays (falling snow, etc).
if (player_index == 0)
Weather::RenderOverlay(s, true);
else
Weather::RenderOverlay(s, false);
// End of 3D drawing.
Render::EndFrame();
// Draw any UI stuff.
UI::Render(s, player_index);
// Music captions.
Music::Render(s);
// Console.
Console::Render(s);
// Remember the frame time, for computing frame rate stats.
FrameTimeQueue[NextFTSample].Timestamp = CurrentTicks;
FrameTimeQueue[NextFTSample].FrameTime = DeltaTicks;
NextFTSample += 1;
if (NextFTSample >= FT_SAMPLES) NextFTSample = 0;
// Show the frame rate.
if (Config::GetBoolValue("ShowFrameRate")) {
// Compute min, max, average frame times over the past one second.
int min = 1000, max = 1, sum = 0, SampleCount = 0;
int i;
for (i = 0; i < FT_SAMPLES; i++) {
FrameTimeSample& s = FrameTimeQueue[i];
if (CurrentTicks - s.Timestamp < 1000) {
// Sample is within the last second.
if (s.FrameTime < min) min = s.FrameTime;
if (s.FrameTime > max) max = s.FrameTime;
sum += s.FrameTime;
SampleCount++;
}
}
// Compute corresponding frame rates.
float MinFR, MaxFR, AvgFR;
MinFR = 1000.0f / max;
MaxFR = 1000.0f / min;
if (SampleCount) {
AvgFR = (SampleCount * 1000.0f) / sum;
}
// Show the stats.
char buf[80];
strcpy(buf, "fps: ");
Text::FormatNumber(buf + strlen(buf), 1000.0f / DeltaTicks, 2, 1); // last
strcat(buf, "/");
Text::FormatNumber(buf + strlen(buf), MinFR, 2, 1); // min
strcat(buf, "/");
Text::FormatNumber(buf + strlen(buf), MaxFR, 2, 1); // max
strcat(buf, "/");
Text::FormatNumber(buf + strlen(buf), AvgFR, 2, 1); // avg
Text::DrawString(5, 12, Text::FIXEDSYS, Text::ALIGN_LEFT, buf);
// Show a scrolling bar graph of frame rate.
GUIBegin();//xxxx
for (i = 0; i < FT_SAMPLES; i++) {
FrameTimeSample& s = FrameTimeQueue[(NextFTSample + i) % FT_SAMPLES];
float height = 0;
if (s.FrameTime) height = (1000.0f / s.FrameTime) / 240.0f;
glColor3f(1, 0.25f, 0.25f);
glBegin(GL_QUADS);
glVertex2f((i-320)/320.0f, 180/240.0f + 0);
glVertex2f((i-320+1)/320.0f, 180/240.0f + 0);
glVertex2f((i-320+1)/320.0f, 180/240.0f + height);
glVertex2f((i-320)/320.0f, 180/240.0f + height);
glEnd();
}
GUIEnd();//xxxx
}
// Show some other miscellaneous info, if desired.
if (Config::GetBoolValue("ShowRenderStats")) {
char buf[1000];
sprintf(buf, "Model:\n texels: %dK\n tris: %d\n"
"Terrain:\n tris: %d\n active nodes: %d\n total nodes: %d\n nudge: %g\n"
" cache:\n texels: %dK\n active nodes = %d\n nodes built = %d\n thrash ct = %d"
,
Model::GetTexelCount() / 1024,
Model::GetRenderedTriangleCount(),
TerrainMesh::GetRenderedTriangleCount(),
TerrainMesh::GetNodesActiveCount(),
TerrainMesh::GetNodesTotalCount(),
TerrainMesh::GetDetailNudge(),
Surface::GetTexelCount() / 1024,
Surface::GetActiveNodeCount(),
Surface::GetNodesBuilt(),
Surface::GetThrashCount()
);
Text::DrawMultiLineString(5, 24, Text::FIXEDSYS, Text::ALIGN_LEFT, 640, buf);
}
// Show viewer location.
if (Config::GetBoolValue("ShowViewerLocation") && Viewer) {
char buf[80];
Text::FontID f = Text::FIXEDSYS;
vec3 v = ViewerLoc;
int y = 400;
int dy = Text::GetFontHeight(f);
Text::FormatNumber(buf, v.X() + 32768, 4, 1);
Text::DrawString(20, y, f, Text::ALIGN_LEFT, buf, 0xFF000000);
y += dy;
Text::FormatNumber(buf, v.Y(), 4, 1);
Text::DrawString(20, y, f, Text::ALIGN_LEFT, buf, 0xFF000000);
y += dy;
Text::FormatNumber(buf, v.Z() + 32768, 4, 1);
Text::DrawString(20, y, f, Text::ALIGN_LEFT, buf, 0xFF000000);
y += dy;
}
// // Log user speed xxxxxx
// {
// char buf[80];
// float speed = 0;
// MDynamic* d = Game::GetUser();
// if (d) speed = d->GetVelocity().magnitude();
// Text::FormatNumber(buf, speed * 2.2369, 3, 1);
// Text::DrawString(40, 400, Text::DEFAULT, Text::ALIGN_LEFT, buf);
// }
// // xxxxxxxx
Overlay::Render();
if (Config::GetValue("RecordMoviePath")) SaveMovieFrame();
const char* fn = Config::GetValue("SaveFramePPM");
if (fn) {
Render::WriteScreenshotFilePPM(fn);
Config::SetValue("SaveFramePPM", NULL);
}
} // end of two player display
Render::ShowFrame();
//xxxxxxx
Config::SetBoolValue("F4Pressed", false);
}