Quake Standards Group

Tutorial *46*

Ok , this one is easy, I’ve found it although I’ve got only a couple months experience with C and OpenGL. (I’m programming for a couple of years but in Delphi)

Ok , here we go:

Step 1 : open the ref_gl.dll source. Go to gl_rmain.c find the place where all the cvar’s are declared and add.



cvar_t *gl_wire; //SEB

Step 2: find the function R_Register still in gl_rmain.c and add somewhere in there



gl_wire = ri.Cvar_Get ("gl_wire", "0", 0); //SEB

Step 3 : find the function R_Renderview and seek for the lines



R_MarkLeaves (); // done here so we know if we're in water



R_DrawWorld ();



R_DrawEntitiesOnList ();

Replace them with



R_MarkLeaves (); // done here so we know if we're in water



if (gl_wire->value) qglPolygonMode (GL_FRONT_AND_BACK, GL_LINE); //SEB



R_DrawWorld ();



if (gl_wire->value) qglPolygonMode (GL_FRONT_AND_BACK, GL_FILL); //SEB



R_DrawEntitiesOnList ();

or if you want to display models wired to :



R_MarkLeaves (); // done here so we know if we're in water



if (gl_wire->value) qglPolygonMode (GL_FRONT_AND_BACK, GL_LINE); //SEB



R_DrawWorld ();



R_DrawEntitiesOnList ();



if (gl_wire->value) qglPolygonMode (GL_FRONT_AND_BACK, GL_FILL); //SEB

Step 4: If you try to run quake with your dll now it will look very weird if you turn on the wireframe mode. This is because the screen isn’t cleared , so to do this , add the next function above R_RenderFrame



void Draw_BlackScreen (void)//SEB

{

GLSTATE_DISABLE_ALPHATEST

GLSTATE_ENABLE_BLEND

qglDisable (GL_TEXTURE_2D);

qglColor4f (0, 0, 0, 1); // here you can set the color 0,0,0 is just black , white looks nice too.



VA_SetElem2(vert_array[0],0,0);

VA_SetElem2(vert_array[1],vid.width, 0);

VA_SetElem2(vert_array[2],vid.width, vid.height);

VA_SetElem2(vert_array[3],0, vid.height);

qglDrawArrays (GL_QUADS, 0, 4);



qglColor4f (1,1,1,1);

qglEnable (GL_TEXTURE_2D);

GLSTATE_DISABLE_BLEND

GLSTATE_ENABLE_ALPHATEST

}

Step 5 : look at the function R_RenderFrame and replace :



R_RenderView( fd );

R_SetLightLevel ();

R_SetGL2D ();

With



if (gl_wire->value) Draw_BlackScreen ();//SEB

R_RenderView( fd );

R_SetLightLevel ();

R_SetGL2D ();

Well this should be it , in your console type gl_wire 1 to turn on the wired mode.You could add some fancy stuff like a cvar for turning the model to wireframe without the world , or the world alone , or to set the background color. It shouldn’t be too difficult. I use it to test my own level , too see exactly which polygons are drawn and which aren’t. It’s also a good wallhack but I didn’t made this to spoil multiplayer games, so don’t use it if you go play on-line.