//Render a frame
void RenderFrame(double currentTime, double timePassed)
{
//Clear buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity(); //reset modelview matrix
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glTranslatef(0.0f, 0.0f,-5.0f);
glRotatef((float)currentTime/10, 0.0f, 1.0f, 0.0f);
//Create a simple rotating tetrahedron
glBegin(GL_TRIANGLE_FAN);
{
glColor3f( 1.0f, 0.0f, 0.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glColor3f( 0.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 1.0f);
glColor3f( 0.0f, 0.0f, 1.0f);
glVertex3f( 1.0f,-1.0f,-1.0f);
glColor3f( 0.0f, 1.0f, 0.0f);
glVertex3f( -1.0f,-1.0f,-1.0f);
glColor3f( 0.0f, 0.0f, 1.0f);
glVertex3f( -1.0f,-1.0f, 1.0f);
glColor3f( 0.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 1.0f);
}
glEnd();
fpsCounter.Update();
//Print text
font.StartTextMode();
glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
font.Print(0, 28, "FPS: %.2f", fpsCounter.GetFps());
font.EndTextMode();
WINDOW::Instance()->SwapBuffers();
//Save a screenshot
if(WINDOW::Instance()->IsKeyPressed(VK_F1))
{
WINDOW::Instance()->SaveScreenshot();
WINDOW::Instance()->SetKeyReleased(VK_F1);
}
//Check for an openGL error
WINDOW::Instance()->CheckGLError();
//quit if necessary
if(WINDOW::Instance()->IsKeyPressed(VK_ESCAPE))
PostQuitMessage(0);
}
//Render a frame
void RenderFrame(double currentTime, double timePassed)
{
//Clear buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity(); //reset modelview matrix
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
gluLookAt( 0.0f, 1.8f, 1.8f,
0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0);
//Enable texture
glBindTexture(GL_TEXTURE_2D, floorTexture);
glEnable(GL_TEXTURE_2D);
//Set up vertex arrays
glVertexPointer(3, GL_FLOAT, sizeof(SIMPLE_VERTEX), &vertices[0].position);
glEnableClientState(GL_VERTEX_ARRAY);
glNormalPointer(GL_FLOAT, sizeof(SIMPLE_VERTEX), &vertices[0].normal);
glEnableClientState(GL_NORMAL_ARRAY);
glTexCoordPointer(2, GL_FLOAT, sizeof(SIMPLE_VERTEX), &vertices[0].texCoords);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
//Use Fixed Function Pipeline
if(useFixedFunction)
{
//Set parameters for GL lighting
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, white*0.1f); //global ambient
glMaterialfv(GL_FRONT, GL_AMBIENT, white);
glMaterialfv(GL_FRONT, GL_DIFFUSE, white);
glEnable(GL_LIGHTING);
//8 passes, dealing with 8 lights at a time, except final pass where we do 4
for(int i=0; i<8; ++i)
{
int numLightsThisPass=8;
if(i==7)
numLightsThisPass=4;
//Set up lights
for(int j=0; j<numLightsThisPass; ++j)
{
glLightfv(GL_LIGHT0+j, GL_POSITION, VECTOR4D(lights[i*8+j].position));
glLightfv(GL_LIGHT0+j, GL_DIFFUSE, lights[i*8+j].color);
glEnable(GL_LIGHT0+j);
}
//If this is the final pass, disable lights 4-7
if(i==7)
for(int j=4; j<7; ++j)
glDisable(GL_LIGHT0+j);
//Enable additive blend for all passes except the first
if(i!=0)
{
glBlendFunc(GL_ONE, GL_ONE);
glEnable(GL_BLEND);
//if this is not the first pass, no ambient
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, black);
}
//Draw grid as triangle strips
for(int j=0; j<gridDensity-1; ++j)
glDrawElements( GL_TRIANGLE_STRIP, gridDensity*2,
GL_UNSIGNED_INT, &indices[j*gridDensity*2]);
}
//Disable lights
for(int j=0; j<7; ++j)
glDisable(GL_LIGHT0+j);
glDisable(GL_LIGHTING);
glDisable(GL_BLEND);
}
//Use vp1
if(useVP1)
{
//Bind program
glBindProgramNV(GL_VERTEX_PROGRAM_NV, vp1);
glEnable(GL_VERTEX_PROGRAM_NV);
//3 passes, dealing with 20 lights at a time
for(int i=0; i<3; ++i)
{
//Send ambient brightness as c[4]
//Only send this for the first pass
if(i==0)
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, white*0.1f);
else
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, black);
//Update program parameters 5&6 for light0, 7&8 for light1, etc
for(int j=0; j<20; ++j)
{
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+5,
VECTOR4D(lights[i*20+j].position));
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+6,
lights[i*20+j].color);
}
//Enable additive blend for passes except the first
if(i>0)
{
glBlendFunc(GL_ONE, GL_ONE);
glEnable(GL_BLEND);
}
//Draw grid as triangle strips
for(int j=0; j<gridDensity-1; ++j)
glDrawElements( GL_TRIANGLE_STRIP, gridDensity*2,
GL_UNSIGNED_INT, &indices[j*gridDensity*2]);
}
glDisable(GL_VERTEX_PROGRAM_NV);
glDisable(GL_BLEND);
}
//Use vp2
if(useVP2)
{
//Bind program
glBindProgramNV(GL_VERTEX_PROGRAM_NV, vp2);
glEnable(GL_VERTEX_PROGRAM_NV);
//Send ambient brightness as c[4]
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 4, white*0.1f);
//Update program parameters 5&6 for light0, 7&8 for light1, etc
for(int j=0; j<60; ++j)
{
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+5,
VECTOR4D(lights[j].position));
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 2*j+6,
lights[j].color);
}
//Send loop parameters to c[125]
glProgramParameter4fNV(GL_VERTEX_PROGRAM_NV, 125, 60.0, //number of lights
5.0, //base offset of light data
-1.0,
2.0);//num parameters between lights
//Draw grid as triangle strips
for(int j=0; j<gridDensity-1; ++j)
glDrawElements( GL_TRIANGLE_STRIP, gridDensity*2,
GL_UNSIGNED_INT, &indices[j*gridDensity*2]);
glDisable(GL_VERTEX_PROGRAM_NV);
}
//reset states
glDisable(GL_TEXTURE_2D);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
fpsCounter.Update();
//Print text
font.StartTextMode();
glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
font.Print(0, 28, "FPS: %.2f", fpsCounter.GetFps());
glColor4f(1.0f, 0.0f, 0.0f, 0.0f);
if(useVP1)
font.Print(0, 48, "Using NV_vertex_program");
if(useVP2)
font.Print(0, 48, "Using NV_vertex_program2");
if(useFixedFunction)
font.Print(0, 48, "Using Fixed Function Pipeline");
font.EndTextMode();
WINDOW::Instance()->SwapBuffers();
//Save a screenshot
if(WINDOW::Instance()->IsKeyPressed(VK_F1))
{
WINDOW::Instance()->SaveScreenshot();
WINDOW::Instance()->SetKeyReleased(VK_F1);
}
//Check for an openGL error
WINDOW::Instance()->CheckGLError();
//quit if necessary
if(WINDOW::Instance()->IsKeyPressed(VK_ESCAPE))
PostQuitMessage(0);
}
