added support for VF_PERSPECTIVE = false in frustum culling

[xonotic/darkplaces.git] / gl_rmain.c

diff --git a/gl_rmain.c b/gl_rmain.c
index f1dd2be5cbdd7ca3a2e85059653f692fea80e833..65c5b946c94f9a3b57178b169fe4f777c5ca7e8f 100644 (file)
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -1927,17 +1927,31 @@ static void R_View_SetFrustum(void)
 
 
 
-       slopex = 1.0 / r_view.frustum_x;
-       slopey = 1.0 / r_view.frustum_y;
-       VectorMA(r_view.forward, -slopex, r_view.left, r_view.frustum[0].normal);
-       VectorMA(r_view.forward,  slopex, r_view.left, r_view.frustum[1].normal);
-       VectorMA(r_view.forward, -slopey, r_view.up  , r_view.frustum[2].normal);
-       VectorMA(r_view.forward,  slopey, r_view.up  , r_view.frustum[3].normal);
-       VectorCopy(r_view.forward, r_view.frustum[4].normal);
-       VectorNormalize(r_view.frustum[0].normal);
-       VectorNormalize(r_view.frustum[1].normal);
-       VectorNormalize(r_view.frustum[2].normal);
-       VectorNormalize(r_view.frustum[3].normal);
+       if (r_view.useperspective)
+       {
+               slopex = 1.0 / r_view.frustum_x;
+               slopey = 1.0 / r_view.frustum_y;
+               VectorMA(r_view.forward, -slopex, r_view.left, r_view.frustum[0].normal);
+               VectorMA(r_view.forward,  slopex, r_view.left, r_view.frustum[1].normal);
+               VectorMA(r_view.forward, -slopey, r_view.up  , r_view.frustum[2].normal);
+               VectorMA(r_view.forward,  slopey, r_view.up  , r_view.frustum[3].normal);
+               VectorCopy(r_view.forward, r_view.frustum[4].normal);
+
+               // calculate frustum corners, which are used to calculate deformed frustum planes for shadow caster culling
+               VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward, -1024 * slopex, r_view.left, -1024 * slopey, r_view.up, r_view.frustumcorner[0]);
+               VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward,  1024 * slopex, r_view.left, -1024 * slopey, r_view.up, r_view.frustumcorner[1]);
+               VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward, -1024 * slopex, r_view.left,  1024 * slopey, r_view.up, r_view.frustumcorner[2]);
+               VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward,  1024 * slopex, r_view.left,  1024 * slopey, r_view.up, r_view.frustumcorner[3]);
+       }
+       else
+       {
+               VectorScale(r_view.left, -r_view.x - r_view.width, r_view.frustum[0].normal);
+               VectorScale(r_view.left,  r_view.x               , r_view.frustum[1].normal);
+               VectorScale(r_view.up, -r_view.y - r_view.height , r_view.frustum[2].normal);
+               VectorScale(r_view.up,  r_view.y                 , r_view.frustum[3].normal);
+               VectorCopy(r_view.forward, r_view.frustum[4].normal);
+       }
+
        r_view.frustum[0].dist = DotProduct (r_view.origin, r_view.frustum[0].normal);
        r_view.frustum[1].dist = DotProduct (r_view.origin, r_view.frustum[1].normal);
        r_view.frustum[2].dist = DotProduct (r_view.origin, r_view.frustum[2].normal);
@@ -1949,12 +1963,6 @@ static void R_View_SetFrustum(void)
        PlaneClassify(&r_view.frustum[3]);
        PlaneClassify(&r_view.frustum[4]);
 
-       // calculate frustum corners, which are used to calculate deformed frustum planes for shadow caster culling
-       VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward, -1024 * slopex, r_view.left, -1024 * slopey, r_view.up, r_view.frustumcorner[0]);
-       VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward,  1024 * slopex, r_view.left, -1024 * slopey, r_view.up, r_view.frustumcorner[1]);
-       VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward, -1024 * slopex, r_view.left,  1024 * slopey, r_view.up, r_view.frustumcorner[2]);
-       VectorMAMAMAM(1, r_view.origin, 1024, r_view.forward,  1024 * slopex, r_view.left,  1024 * slopey, r_view.up, r_view.frustumcorner[3]);
-
        // LordHavoc: note to all quake engine coders, Quake had a special case
        // for 90 degrees which assumed a square view (wrong), so I removed it,
        // Quake2 has it disabled as well.