optimized the Mod_Q3BSP_LightPoint pitch/yaw math by using the

mod_md3_sin table rather than a lot of angle math to feed to cos/sin

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7288 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/model_brush.c b/model_brush.c
index f3b4dbaa25cd221d639e3d7a7519a4e58f65fe6d..ae1e1b97ebfa838c6e0cf542187ce011f49c09e2 100644 (file)
--- a/model_brush.c
+++ b/model_brush.c
@@ -5625,12 +5625,12 @@ static void Mod_Q3BSP_LightPoint(model_t *model, const vec3_t p, vec3_t ambientc
                                s = a + (k * model->brushq3.num_lightgrid_isize[1] + j) * model->brushq3.num_lightgrid_isize[0] + i;
                                VectorMA(ambientcolor, blend * (1.0f / 128.0f), s->ambientrgb, ambientcolor);
                                VectorMA(diffusecolor, blend * (1.0f / 128.0f), s->diffusergb, diffusecolor);
-                               pitch = s->diffusepitch * M_PI / 128;
-                               yaw = s->diffuseyaw * M_PI / 128;
-                               sinpitch = sin(pitch);
-                               diffusenormal[0] += blend * (cos(yaw) * sinpitch);
-                               diffusenormal[1] += blend * (sin(yaw) * sinpitch);
-                               diffusenormal[2] += blend * (cos(pitch));
+                               // this uses the mod_md3_sin table because the values are
+                               // already in the 0-255 range, the 64+ bias fetches a cosine
+                               // instead of a sine value
+                               diffusenormal[0] += blend * (mod_md3_sin[64 + s->diffuseyaw] * mod_md3_sin[s->diffusepitch]);
+                               diffusenormal[1] += blend * (mod_md3_sin[     s->diffuseyaw] * mod_md3_sin[s->diffusepitch]);
+                               diffusenormal[2] += blend * (mod_md3_sin[64 + s->diffusepitch]);
                                //Con_Printf("blend %f: ambient %i %i %i, diffuse %i %i %i, diffusepitch %i diffuseyaw %i (%f %f, normal %f %f %f)\n", blend, s->ambientrgb[0], s->ambientrgb[1], s->ambientrgb[2], s->diffusergb[0], s->diffusergb[1], s->diffusergb[2], s->diffusepitch, s->diffuseyaw, pitch, yaw, (cos(yaw) * cospitch), (sin(yaw) * cospitch), (-sin(pitch)));
                        }
                }