added gl_lockarrays_minimumvertices cvar for testing

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6842 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/gl_backend.c b/gl_backend.c
index 3fcd972b59a496581e85141891dbd677813e593c..6bee7dc636abd03fb2d0504d9bbddb1d585f3d86 100644 (file)
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -13,6 +13,7 @@ cvar_t r_waterwarp = {CVAR_SAVE, "r_waterwarp", "1", "warp view while underwater
 cvar_t gl_polyblend = {CVAR_SAVE, "gl_polyblend", "1", "tints view while underwater, hurt, etc"};
 cvar_t gl_dither = {CVAR_SAVE, "gl_dither", "1", "enables OpenGL dithering (16bit looks bad with this off)"};
 cvar_t gl_lockarrays = {0, "gl_lockarrays", "1", "enables use of glLockArraysEXT, may cause glitches with some broken drivers"};
+cvar_t gl_lockarrays_minimumvertices = {0, "gl_lockarrays_minimumvertices", "1", "minimum number of vertices required for use of glLockArraysEXT, setting this too low may reduce performance"};
 
 int gl_maxdrawrangeelementsvertices;
 int gl_maxdrawrangeelementsindices;
@@ -227,6 +228,7 @@ void gl_backend_init(void)
        Cvar_RegisterVariable(&gl_polyblend);
        Cvar_RegisterVariable(&gl_dither);
        Cvar_RegisterVariable(&gl_lockarrays);
+       Cvar_RegisterVariable(&gl_lockarrays_minimumvertices);
        Cvar_RegisterVariable(&gl_paranoid);
        Cvar_RegisterVariable(&gl_printcheckerror);
 #ifdef NORENDER
@@ -659,6 +661,11 @@ void GL_Color(float cr, float cg, float cb, float ca)
 
 void GL_LockArrays(int first, int count)
 {
+       if (count < gl_lockarrays_minimumvertices.integer)
+       {
+               first = 0;
+               count = 0;
+       }
        if (gl_state.lockrange_count != count || gl_state.lockrange_first != first)
        {
                if (gl_state.lockrange_count)