add "r_fog_clear" cvar which allows to disable framebuffer clearing to fog color...

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10942 d7cf8633-e32d-0410-b094-e92efae38249
::stable-branch::merge=3e7f49875fab5f42941120f4bec55ec3e22a3bfa

diff --git a/cl_screen.c b/cl_screen.c
index 2a9f42818824056f39265ca1e062a1632779d3f9..2abb2903a985437603ca34aaf1b510cf73add423 100644 (file)
--- a/cl_screen.c
+++ b/cl_screen.c
@@ -86,6 +86,7 @@ cvar_t vid_touchscreen_overlayalpha = {0, "vid_touchscreen_overlayalpha", "0.25"
 
 extern cvar_t v_glslgamma;
 extern cvar_t sbar_info_pos;
+extern cvar_t r_fog_clear;
 #define WANT_SCREENSHOT_HWGAMMA (scr_screenshot_hwgamma.integer && vid_usinghwgamma)
 
 int jpeg_supported = false;
@@ -1612,7 +1613,8 @@ void R_ClearScreen(qboolean fogcolor)
        if (fogcolor)
        {
                R_UpdateFogColor();
-               VectorCopy(r_refdef.fogcolor, clearcolor);
+               if (r_fog_clear.integer)
+                       VectorCopy(r_refdef.fogcolor, clearcolor);
        }
        // clear depth is 1.0
        // LordHavoc: we use a stencil centered around 128 instead of 0,

diff --git a/gl_rmain.c b/gl_rmain.c
index 19ad74b42186d90d2cbbc6dc24d34adc118bb318..c6d4f33174d7ca2d4ee4ee0a77305e2dba8d5a83 100644 (file)
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -115,6 +115,7 @@ cvar_t r_polygonoffset_submodel_offset = {0, "r_polygonoffset_submodel_offset",
 cvar_t r_polygonoffset_decals_factor = {0, "r_polygonoffset_decals_factor", "0", "biases depth values of decals to prevent z-fighting artifacts"};
 cvar_t r_polygonoffset_decals_offset = {0, "r_polygonoffset_decals_offset", "-14", "biases depth values of decals to prevent z-fighting artifacts"};
 cvar_t r_fog_exp2 = {0, "r_fog_exp2", "0", "uses GL_EXP2 fog (as in Nehahra) rather than realistic GL_EXP fog"};
+cvar_t r_fog_clear = {0, "r_fog_clear", "1", "clears renderbuffer with fog color before render starts"};
 cvar_t r_drawfog = {CVAR_SAVE, "r_drawfog", "1", "allows one to disable fog rendering"};
 cvar_t r_transparentdepthmasking = {CVAR_SAVE, "r_transparentdepthmasking", "0", "enables depth writes on transparent meshes whose materially is normally opaque, this prevents seeing the inside of a transparent mesh"};
 
@@ -4069,6 +4070,7 @@ void GL_Main_Init(void)
        Cvar_RegisterVariable(&r_polygonoffset_decals_factor);
        Cvar_RegisterVariable(&r_polygonoffset_decals_offset);
        Cvar_RegisterVariable(&r_fog_exp2);
+       Cvar_RegisterVariable(&r_fog_clear);
        Cvar_RegisterVariable(&r_drawfog);
        Cvar_RegisterVariable(&r_transparentdepthmasking);
        Cvar_RegisterVariable(&r_texture_dds_load);