// Render the actual scene
void terrain::render()
{
// Enable depth testing
glEnable(GL_DEPTH_TEST);
// Enable automatic normalization of normals
glEnable(GL_NORMALIZE);
// Clear the screen
glClearColor(1,1,1,0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Nothing to do if we are not properly initialized
if (!initialized)
return;
// Setup perspective and modelview matrix
setup_projection();
// Setup light
setup_light();
// Render the solid terrain with lighting and texture mapping
if (show_solid)
render_solid_terrain();
// Render the outline of the terrain
if (show_wireframe)
render_wireframe_terrain();
// Eventually render level lines
if (show_levels)
render_level_lines();
}
void example_3d_primitives::render()
{
glEnable(GL_DEPTH_TEST);
// Clear the screen
glClearColor(1,1,1,0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Setup a perspective projection and lighting
setup_projection();
setup_light();
glScaled(0.4, 0.4, 0.4);
// Move 5 units to the left, save the current transformation
// and show a rotated tetrahedron
glTranslated(-5, 0, 0);
glPushMatrix();
glRotated(angle, 0, 1, 0);
glColor3d(1, 1, 0);
render_tetrahedron();
glPopMatrix();
// Move 3 units to the right, save the current transformation
// and show a rotated cylinder
glTranslated(3, 0, 0);
glPushMatrix();
glRotated(angle, 1, 0, 0);
glColor3d(0, 1, 0);
render_cylinder();
glPopMatrix();
// Move 3 units to the right, save the current transformation
// and show a rotated cube
glTranslated(3, 0, 0);
glPushMatrix();
glRotated(angle, 0, 1, 1);
glColor3d(1, 0, 0);
render_cube();
glPopMatrix();
// Move 3 units to the right, save the current transformation
// and show a rotated sphere
glTranslated(3, 0, 0);
glPushMatrix();
glRotated(angle, 0, 1, 0);
glColor3d(0, 0, 1);
render_sphere();
glPopMatrix();
}
void myinit()
{
glClearColor(0.0, 0.0, 0.0, 1.0); /*set the background color BLACK */
/*Clear the Depth & Color Buffers */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
/*---Create a light source----*/
glEnable(GL_LIGHTING);
setup_light();
glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, global_ambient);
glEnable(GL_NORMALIZE); /*Enable mornalization */
/*---Create quadratic objects---*/
if (sphere == NULL) {
sphere = gluNewQuadric();
gluQuadricDrawStyle(sphere, GLU_FILL);
gluQuadricNormals(sphere, GLU_SMOOTH);
}
if (cylind == NULL) {
cylind = gluNewQuadric();
gluQuadricDrawStyle(cylind, GLU_FILL);
gluQuadricNormals(cylind, GLU_SMOOTH);
}
if (disk == NULL) {
disk = gluNewQuadric();
gluQuadricDrawStyle(disk, GLU_FILL);
gluQuadricNormals(disk, GLU_SMOOTH);
}
/*-----Create Texture -----*/
make_check();
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glGenTextures(4, textName);
glBindTexture(GL_TEXTURE_2D, textName[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TSIZE, TSIZE, 0, GL_RGBA,
GL_UNSIGNED_BYTE, checkboard);
/*-----Create another texture ----*/
Create_Texture_Star();
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glBindTexture(GL_TEXTURE_2D, textName[1]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TSIZE, TSIZE, 0, GL_RGBA,
GL_UNSIGNED_BYTE, star);
brick_pattern();
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glBindTexture(GL_TEXTURE_2D, textName[2]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TSIZE, TSIZE, 0, GL_RGBA,
GL_UNSIGNED_BYTE, brick);
Create_Texture_Waterwave();
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glBindTexture(GL_TEXTURE_2D, textName[3]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TSIZE, TSIZE, 0, GL_RGBA,
GL_UNSIGNED_BYTE, waterwave);
/*----Set up fog conditions ---*/
glEnable(GL_FOG); /*enable fog fade */
setup_fog();
/*---- Compute cos(5.0) and sin(5.0) ----*/
cv = cos(5.0*PI / 180.0);
sv = sin(5.0*PI / 180.0);
/*---- Copy eye position ---*/
eye[0] = Eye[0];
eye[1] = Eye[1];
eye[2] = Eye[2];
}
void idle_func()
{
ds += 0.001;
if (ds>1.0) ds = ds - 1.0;
if (turn_fog == 1) {
fog_color[0] += 0.001;
fog_color[1] += 0.001;
fog_color[2] += 0.001;
if (lit4_diffuse[0] > 0.7)
fog_color[0] *= -1.0;
else if (lit4_diffuse[0] < 0.1)
fog_color[0] *= -1.0;
if (lit4_diffuse[1] > 0.7)
fog_color[1] *= -1.0;
else if (lit4_diffuse[1] < 0.1)
fog_color[1] *= -1.0;
if (lit4_diffuse[2] > 0.7)
fog_color[2] *= -1.0;
else if (lit4_diffuse[2] < 0.1)
fog_color[2] *= -1.0;
}
else {
fog_color[0] = 0.15;
fog_color[1] = 0.20;
fog_color[2] = 0.20;
}
bld_ang += 5.0;
lit4_diffuse[0] += lit_color4[0];
lit4_diffuse[1] += lit_color4[1];
lit4_diffuse[2] += lit_color4[2];
lit5_diffuse[0] += lit_color5[0];
lit5_diffuse[1] += lit_color5[1];
lit5_diffuse[2] += lit_color5[2];
if (bld_ang>360.0) {
bld_ang -= 360.0;
}
if (lit4_diffuse[0]>1.0)
lit_color4[0] *= -1.0;
else if (lit4_diffuse[0]<0.1)
lit_color4[0] *= -1.0;
if (lit4_diffuse[1]>1.0)
lit_color4[1] *= -1.0;
else if (lit4_diffuse[1]<0.1)
lit_color4[1] *= -1.0;
if (lit4_diffuse[2]>1.0)
lit_color4[2] *= -1.0;
else if (lit4_diffuse[2]<0.1)
lit_color4[2] *= -1.0;
if (lit5_diffuse[0]>1.0)
lit_color5[0] *= -1.0;
else if (lit5_diffuse[0]<0.1)
lit_color5[0] *= -1.0;
if (lit5_diffuse[1]>1.0)
lit_color5[1] *= -1.0;
else if (lit5_diffuse[1]<0.1)
lit_color5[1] *= -1.0;
if (lit5_diffuse[2]>1.0)
lit_color5[2] *= -1.0;
else if (lit5_diffuse[2]<0.1)
lit_color5[2] *= -1.0;
setup_light();
setup_fog();
display(); /* show the scene again */
}
