void Draw (void) // Draw The Scene
{
glClearColor(0.0f, 0.0f, 0.0f, 0.5); // Set The Clear Color To Black
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glLoadIdentity(); // Reset The View
RenderToTexture(); // Render To A Texture
ProcessHelix(); // Draw Our Helix
DrawBlur(25,0.02f); // Draw The Blur Effect
glFlush (); // Flush The GL Rendering Pipeline
}
void drawGLScene(void) /* Draw The Scene */
{
glClearColor(0.0f, 0.0f, 0.0f, 0.5); /* Set The Clear Color To Black */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* Clear Screen And Depth Buffer */
glLoadIdentity(); /* Reset The View */
RenderToTexture(); /* Render To A Texture */
ProcessHelix(); /* Draw Our Helix */
DrawBlur(25,0.02f); /* Draw The Blur Effect */
glFlush(); /* Flush The GL Rendering Pipeline */
}
void NEHE36::RenderToTexture(){
glViewport(0,0,128,128);
ProcessHelix();
glBindTexture(GL_TEXTURE_2D,BlurTexture);
// Copy Our ViewPort To The Blur Texture (From 0,0 To 128,128... No Border)
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 0, 0, 128, 128, 0);
glClearColor(0.0f, 0.0f, 0.5f, 0.5);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0 , 0,640 ,480);
}
void RenderToTexture() // Renders To A Texture
{
glViewport(0,0,128,128); // Set Our Viewport (Match Texture Size)
ProcessHelix(); // Render The Helix
glBindTexture(GL_TEXTURE_2D,BlurTexture); // Bind To The Blur Texture
// Copy Our ViewPort To The Blur Texture (From 0,0 To 128,128... No Border)
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 0, 0, 128, 128, 0);
glClearColor(0.0f, 0.0f, 0.5f, 0.5); // Set The Clear Color To Medium Blue
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And Depth Buffer
glViewport(0 , 0,wwidth ,wheight); // Set Viewport (0,0 to 640x480)
}
void RenderToTexture() /* Renders To A Texture */
{
unsigned int width,height;
glViewport(0,0,128,128); /* Set Our Viewport (Match Texture Size) */
ProcessHelix(); /* Render The Helix */
glBindTexture(GL_TEXTURE_2D,BlurTexture); /* Bind To The Blur Texture */
/* Copy Our ViewPort To The Blur Texture (From 0,0 To 128,128... No Border) */
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 0, 0, 128, 128, 0);
glClearColor(0.0f, 0.0f, 0.5f, 0.5); /* Set The Clear Color To Medium Blue */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* Clear The Screen And Depth Buffer */
getScreenSize(&width,&height); /* Get actual window size */
glViewport(0 , 0,width,height); /* Set Viewport (0,0 to widthxheight) */
}
GLvoid NEHE36::DrawGLScene(){
glClearColor(0.0f, 0.0f, 0.0f, 0.5);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
RenderToTexture();
ProcessHelix();
DrawBlur(25,0.02f);
//draw FPS text
GLint matrixMode;
GLboolean lightingOn;
lightingOn= glIsEnabled(GL_LIGHTING);
if (lightingOn) glDisable(GL_LIGHTING);
glGetIntegerv(GL_MATRIX_MODE, &matrixMode);
glDisable(GL_TEXTURE_2D);
glDisable(GL_DEPTH_TEST);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glPushAttrib(GL_COLOR_BUFFER_BIT);
glTranslatef(0.0f,0.0f,-1.0f);
glColor3f(0.8f,0.8f,0.8f);
computeFPS();
Utils::drawText(-0.98f,-0.98f, GLUT_BITMAP_HELVETICA_12, FPSstr);
glPopAttrib();
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(matrixMode);
if (lightingOn) glEnable(GL_LIGHTING);
glEnable(GL_TEXTURE_2D);
glEnable(GL_DEPTH_TEST);
glutSwapBuffers();
angle += 0.5f;
}
extern "C" void Draw (void) // Draw The Scene
{
static double ticks;
static double lastticks;
glEnable(GL_DEPTH_TEST); // Enable Depth Testing
GLfloat global_ambient[4]={0.2f, 0.2f, 0.2f, 1.0f}; // Set Ambient Lighting To Fairly Dark Light (No Color)
GLfloat light0pos[4]= {0.0f, 5.0f, 10.0f, 1.0f}; // Set The Light Position
GLfloat light0ambient[4]= {0.2f, 0.2f, 0.2f, 1.0f}; // More Ambient Light
GLfloat light0diffuse[4]= {0.3f, 0.3f, 0.3f, 1.0f}; // Set The Diffuse Light A Bit Brighter
GLfloat light0specular[4]={0.8f, 0.8f, 0.8f, 1.0f}; // Fairly Bright Specular Lighting
GLfloat lmodel_ambient[]= {0.2f,0.2f,0.2f,1.0f}; // And More Ambient Light
glLightModelfv(GL_LIGHT_MODEL_AMBIENT,lmodel_ambient); // Set The Ambient Light Model
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, global_ambient); // Set The Global Ambient Light Model
glLightfv(GL_LIGHT0, GL_POSITION, light0pos); // Set The Lights Position
glLightfv(GL_LIGHT0, GL_AMBIENT, light0ambient); // Set The Ambient Light
glLightfv(GL_LIGHT0, GL_DIFFUSE, light0diffuse); // Set The Diffuse Light
glLightfv(GL_LIGHT0, GL_SPECULAR, light0specular); // Set Up Specular Lighting
glEnable(GL_LIGHTING); // Enable Lighting
glEnable(GL_LIGHT0); // Enable Light0
glShadeModel(GL_SMOOTH); // Select Smooth Shading
glMateriali(GL_FRONT, GL_SHININESS, 128);
glClearColor(0.0f, 0.0f, 0.0f, 0.5); // Set The Clear Color To Black
ticks=SDL_GetTicks();
if(Update (ticks - lastticks))
return;
lastticks = ticks;
glClearColor(0.0f, 0.0f, 0.0f, 0.5); // Set The Clear Color To Black
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glLoadIdentity(); // Reset The View
RenderToTexture(); // Render To A Texture
ProcessHelix(); // Draw Our Helix
DrawBlur(25,0.02f); // Draw The Blur Effect
}
