/* display() draws a triangle at an angle.
*/
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f (1.0f, 0.75f, 0.0f);
glBegin (GL_TRIANGLES);
glFogCoordfEXT (f1);
glVertex3f (2.0f, -2.0f, 0.0f);
glFogCoordfEXT (f2);
glVertex3f (-2.0f, 0.0f, -5.0f);
glFogCoordfEXT (f3);
glVertex3f (0.0f, 2.0f, -10.0f);
glEnd();
glutSwapBuffers();
}
void GLWidget::VolumeFog()
{
glLoadIdentity();
setRotate();
glEnable(GL_FOG);
glBegin(GL_QUADS); //后墙
glFogCoordfEXT(0.0f); glVertex3f(-2.5f,-2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f( 2.5f,-2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f( 2.5f, 2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f(-2.5f, 2.5f,-6.0f);
glEnd();
glBegin(GL_QUADS); // 地面
glFogCoordfEXT(0.0f); glVertex3f(-2.5f,-2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f( 2.5f,-2.5f,-6.0f);
glFogCoordfEXT(1.0f); glVertex3f( 2.5f,-2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f(-2.5f,-2.5f, 6.0f);
glEnd();
glBegin(GL_QUADS); // 天花板
glFogCoordfEXT(0.0f); glVertex3f(-2.5f, 2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f( 2.5f, 2.5f,-6.0f);
glFogCoordfEXT(1.0f); glVertex3f( 2.5f, 2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f(-2.5f, 2.5f, 6.0f);
glEnd();
glBegin(GL_QUADS); // 右墙
glFogCoordfEXT(1.0f); glVertex3f( 2.5f,-2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f( 2.5f, 2.5f, 6.0f);
glFogCoordfEXT(0.0f); glVertex3f( 2.5f, 2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f( 2.5f,-2.5f,-6.0f);
glEnd();
glBegin(GL_QUADS); // 左墙
glFogCoordfEXT(1.0f); glVertex3f(-2.5f,-2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f(-2.5f, 2.5f, 6.0f);
glFogCoordfEXT(0.0f); glVertex3f(-2.5f, 2.5f,-6.0f);
glFogCoordfEXT(0.0f); glVertex3f(-2.5f,-2.5f,-6.0f);
glEnd();
glBegin(GL_QUADS); //前墙
glFogCoordfEXT(1.0f); glVertex3f(-2.5f,-2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f( 2.5f,-2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f( 2.5f, 2.5f, 6.0f);
glFogCoordfEXT(1.0f); glVertex3f(-2.5f, 2.5f, 6.0f);
glEnd();
glDisable(GL_FOG);
}
static void
glFogCoordf_ext (GLfloat f)
{
if (fogCoord)
glFogCoordfEXT(f);
}
int GLDriver::drawFog(GeometryList* l)
{
int count = 0;
for(int j = 0; j < l->faceCount; ++j)
{
int i = l->faces[j];
//qmap->pMapShader[qmap->pFace[i].texture].pShader;
//if(qmap->pFace[i].effect != NULL)
//if(shader->getSurfaceParam() & Fog)
{
if(qmap->pFace[i].effect != NULL)
{
Q3Shader* shader = qmap->pFace[i].effect->shader;
if(!(shader->getSurfaceParam() & Fog))
continue;
float x1, x2, y1, y2, z1, z2;
Q3Brush* brush = qmap->pFace[i].effect->brush;
if(brush == NULL)
continue;
for(int m = brush->brushSideIndex; m < brush->brushSideIndex + brush->numBrushSides; ++m)
{
Q3BrushSide* brushSide = &qmap->pBrushSide[m];
Q3Plane* plane = &qmap->pPlane[brushSide->planeIndex];
for(int n = brush->brushSideIndex; n < brush->brushSideIndex + brush->numBrushSides; ++n)
{
Q3BrushSide* otherBrushSide = &qmap->pBrushSide[n];
if(otherBrushSide != brushSide)
{
Q3Plane* otherPlane = &qmap->pPlane[otherBrushSide->planeIndex];
if(otherPlane->normal.isOpposite(plane->normal))
{
if(plane->normal.x > 0)
{
x1 = plane->distance;
x2 = otherPlane->distance;
}
else if(plane->normal.x < 0)
{
x2 = plane->distance;
x1 = otherPlane->distance;
}
else if(plane->normal.y > 0)
{
y1 = plane->distance;
y2 = otherPlane->distance;
}
else if(plane->normal.y < 0)
{
y2 = plane->distance;
y1 = otherPlane->distance;
}
else if(plane->normal.z > 0)
{
z1 = plane->distance;
z2 = otherPlane->distance;
}
else if(plane->normal.z < 0)
{
z2 = plane->distance;
z1 = otherPlane->distance;
}
}
}
}
}
glDisable(GL_BLEND);
glEnable(GL_ALPHA_TEST);
glDepthFunc (GL_LEQUAL); // The Type Of Depth Testing
glEnable (GL_DEPTH_TEST); // Enable Depth Testing
glShadeModel (GL_SMOOTH); // Select Smooth Shading
glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
float fogColor[4] = {shader->fogParms.r, shader->fogParms.g, shader->fogParms.b, 0.5};
glEnable(GL_FOG); // Enable Fog
glFogi(GL_FOG_MODE, GL_LINEAR); // Fog Fade Is Linear
glFogfv(GL_FOG_COLOR, fogColor); // Set The Fog Color
glFogf(GL_FOG_START, 0.2f); // Set The Fog Start (Least Dense)
glFogf(GL_FOG_END, 1.0f); // Set The Fog End (Most Dense)
glHint(GL_FOG_HINT, GL_NICEST); // Per-Pixel Fog Calculation
glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT); // Set Fog Based On Vertice Coordinates
// Now build a list of points
std::vector<Vec3> points;
points.push_back(Vec3(x1, y1, z1));
points.push_back(Vec3(x2, y1, z1));
points.push_back(Vec3(x2, y2, z1));
points.push_back(Vec3(x1, y2, z1));
points.push_back(Vec3(x1, y2, z2));
points.push_back(Vec3(x2, y2, z2));
points.push_back(Vec3(x2, y1, z2));
points.push_back(Vec3(x1, y1, z2));
glDisable(GL_TEXTURE_2D);
/*glPointSize(20);
glBegin(GL_POINTS);
for(int q = 0; q < points.size(); ++q)
glVertex3f(points[q].x, points[q].y, points[q].z);
glEnd();
continue;*/
glBegin(GL_QUADS); // Back Wall
glFogCoordfEXT( 1.0f); glVertex3f(x1,y1,z1);
glFogCoordfEXT( 1.3f); glVertex3f(x2,y1,z1);
glFogCoordfEXT( 0.2f); glVertex3f( x2, y2,z1);
glFogCoordfEXT( 0.3f); glVertex3f(x1, y2,z1);
glEnd();
glBegin(GL_QUADS); // Floor
glFogCoordfEXT( 1.0f); glVertex3f(x1,y1,z1);
glFogCoordfEXT( 1.0f); glVertex3f( x2,y1,z1);
glFogCoordfEXT( 1.2f); glVertex3f( x2,y1, z2);
glFogCoordfEXT( 1.2f); glVertex3f(x1,y1, z2);
glEnd();
glBegin(GL_QUADS); // Roof
glFogCoordfEXT( 1.0f); glVertex3f(x1, y2,z1);
glFogCoordfEXT( 1.4f); glVertex3f( x2, y2,z1);
glFogCoordfEXT( 1.0f); glVertex3f( x2, y2, z2);
glFogCoordfEXT( 1.2f); glVertex3f(x1, y2, z2);
glEnd();
glBegin(GL_QUADS); // Right Wall
glFogCoordfEXT( 0.2f); glVertex3f( x2,y1, z2);
glFogCoordfEXT( 1.0f); glVertex3f( x2, y2, z2);
glFogCoordfEXT( 1.8f); glVertex3f( x2, y2,z1);
glFogCoordfEXT( 1.6f); glVertex3f( x2,y1,z1);
glEnd();
glBegin(GL_QUADS); // Left Wall
glFogCoordfEXT( 1.0f); glVertex3f(x1,y1, z2);
glFogCoordfEXT( 1.0f); glVertex3f(x1, y2, z2);
glFogCoordfEXT( 1.4f); glVertex3f(x1, y2,z1);
glFogCoordfEXT( .3f); glVertex3f(x1,y1,z1);
glEnd();
}
}
}
glDisable(GL_FOG);
return 0;
}
