fix coronas for "realtime darks"

fix gl_flashblend

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9424 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/r_shadow.c b/r_shadow.c
index b33d4c7c697b616e44dc1c0f33106b8d64a74b56..502654d667cef81879315587948ab768398dc8df 100644 (file)
--- a/r_shadow.c
+++ b/r_shadow.c
@@ -4347,6 +4347,7 @@ void R_ShadowVolumeLighting(qboolean visible)
        size_t lightindex;
        dlight_t *light;
        size_t range;
+       float f;
 
        if (r_shadow_shadowmapmaxsize != bound(1, r_shadow_shadowmapping_maxsize.integer, gl_max_size.integer / 4) ||
                (r_shadow_shadowmode != R_SHADOW_SHADOWMODE_STENCIL) != (r_shadow_shadowmapping.integer && r_glsl.integer && gl_support_fragment_shader && gl_support_ext_framebuffer_object) || 
@@ -4381,8 +4382,19 @@ void R_ShadowVolumeLighting(qboolean visible)
                }
        }
        if (r_refdef.scene.rtdlight)
+       {
                for (lnum = 0;lnum < r_refdef.scene.numlights;lnum++)
                        R_DrawRTLight(r_refdef.scene.lights[lnum], visible);
+       }
+       else if(gl_flashblend.integer)
+       {
+               for (lnum = 0;lnum < r_refdef.scene.numlights;lnum++)
+               {
+                       rtlight_t *rtlight = r_refdef.scene.lights[lnum];
+                       f = (rtlight->style >= 0 ? r_refdef.scene.lightstylevalue[rtlight->style] : 1) * r_shadow_lightintensityscale.value;
+                       VectorScale(rtlight->color, f, rtlight->currentcolor);
+               }
+       }
 
        R_Shadow_RenderMode_End();
 }
@@ -4573,7 +4585,17 @@ void R_DrawCorona(rtlight_t *rtlight, float cscale, float scale)
        }
        VectorScale(rtlight->currentcolor, cscale, color);
        if (VectorLength(color) > (1.0f / 256.0f))
+       {
+               qboolean negated = (color[0] + color[1] + color[2] < 0) && gl_support_ext_blend_subtract;
+               if(negated)
+               {
+                       VectorNegate(color, color);
+                       qglBlendEquationEXT(GL_FUNC_REVERSE_SUBTRACT_EXT);
+               }
                R_DrawSprite(GL_ONE, GL_ONE, r_shadow_lightcorona, NULL, true, false, rtlight->shadoworigin, r_refdef.view.right, r_refdef.view.up, scale, -scale, -scale, scale, color[0], color[1], color[2], 1);
+               if(negated)
+                       qglBlendEquationEXT(GL_FUNC_ADD_EXT);
+       }
 }
 
 void R_DrawCoronas(void)