added R_CalcBeamVerts function, calculates vertex array for beam polygon

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2385 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/gl_rmain.c b/gl_rmain.c
index 0b21178968aac487bc607e33519b039d29a1e428..56b902adf9516a08db2d4928e485a8f72fb14425 100644 (file)
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -823,3 +823,33 @@ void R_DrawNoModel(entity_render_t *ent)
        //      R_DrawNoModelCallback(ent, 0);
 }
 
+void R_CalcBeamVerts (float *vert, vec3_t org1, vec3_t org2, float width)
+{
+       vec3_t right1, right2, diff, normal;
+
+       VectorSubtract (org2, org1, normal);
+       VectorNormalizeFast (normal);
+
+       // calculate 'right' vector for start
+       VectorSubtract (r_origin, org1, diff);
+       VectorNormalizeFast (diff);
+       CrossProduct (normal, diff, right1);
+
+       // calculate 'right' vector for end
+       VectorSubtract (r_origin, org2, diff);
+       VectorNormalizeFast (diff);
+       CrossProduct (normal, diff, right2);
+
+       vert[ 0] = org1[0] + width * right1[0];
+       vert[ 1] = org1[1] + width * right1[1];
+       vert[ 2] = org1[2] + width * right1[2];
+       vert[ 4] = org1[0] - width * right1[0];
+       vert[ 5] = org1[1] - width * right1[1];
+       vert[ 6] = org1[2] - width * right1[2];
+       vert[ 8] = org2[0] - width * right2[0];
+       vert[ 9] = org2[1] - width * right2[1];
+       vert[10] = org2[2] - width * right2[2];
+       vert[12] = org2[0] + width * right2[0];
+       vert[13] = org2[1] + width * right2[1];
+       vert[14] = org2[2] + width * right2[2];
+}

diff --git a/render.h b/render.h
index 720a45644fab30d59cad9c72029140170279b503..76400a72f2b94a30c5cc3b998deaa674722d582a 100644 (file)
--- a/render.h
+++ b/render.h
@@ -172,5 +172,7 @@ void R_Stain (vec3_t origin, float radius, int cr1, int cg1, int cb1, int ca1, i
 
 void R_DrawCrosshair(void);
 
+void R_CalcBeamVerts (float *vert, vec3_t org1, vec3_t org2, float width);
+
 #endif