fix alpha screenshots

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11976 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/cl_screen.c b/cl_screen.c
index bf562e0cd576b25f43464ccefca403855646a779..d64a5f620ab614774873df13f91f4e8865df2e2d 100644 (file)
--- a/cl_screen.c
+++ b/cl_screen.c
@@ -53,7 +53,7 @@ cvar_t scr_screenshot_jpeg_quality = {CVAR_SAVE, "scr_screenshot_jpeg_quality","
 cvar_t scr_screenshot_png = {CVAR_SAVE, "scr_screenshot_png","0", "save png instead of targa"};
 cvar_t scr_screenshot_gammaboost = {CVAR_SAVE, "scr_screenshot_gammaboost","1", "gamma correction on saved screenshots and videos, 1.0 saves unmodified images"};
 cvar_t scr_screenshot_hwgamma = {CVAR_SAVE, "scr_screenshot_hwgamma","1", "apply the video gamma ramp to saved screenshots and videos"};
-cvar_t scr_screenshot_alpha = {CVAR_SAVE, "scr_screenshot_alpha","0", "try to write an alpha channel to screenshots (debugging feature)"};
+cvar_t scr_screenshot_alpha = {0, "scr_screenshot_alpha","0", "try to write an alpha channel to screenshots (debugging feature)"};
 cvar_t scr_screenshot_timestamp = {CVAR_SAVE, "scr_screenshot_timestamp", "1", "use a timestamp based number of the type YYYYMMDDHHMMSSsss instead of sequential numbering"};
 // scr_screenshot_name is defined in fs.c
 cvar_t cl_capturevideo = {0, "cl_capturevideo", "0", "enables saving of video to a .avi file using uncompressed I420 colorspace and PCM audio, note that scr_screenshot_gammaboost affects the brightness of the output)"};
@@ -2071,8 +2071,12 @@ static void SCR_DrawTouchscreenOverlay(void)
 void R_ClearScreen(qboolean fogcolor)
 {
        float clearcolor[4];
-       // clear to opaque black (if we're being composited it might otherwise render as transparent)
-       Vector4Set(clearcolor, 0.0f, 0.0f, 0.0f, 1.0f);
+       if (scr_screenshot_alpha.integer)
+               // clear to transparency (so png screenshots can contain alpha channel, useful for building model pictures)
+               Vector4Set(clearcolor, 0.0f, 0.0f, 0.0f, 0.0f);
+       else
+               // clear to opaque black (if we're being composited it might otherwise render as transparent)
+               Vector4Set(clearcolor, 0.0f, 0.0f, 0.0f, 1.0f);
        if (fogcolor && r_fog_clear.integer)
        {
                R_UpdateFog();