fixed crashes when a DL affects a transparent surface with r_lightmap 1

changelog.txt

@@ -29,6 +29,8 @@ chg: with r_backend GL3, depth fade with MSAA now requires GLSL 4.00 at a minimu
 
 chg: with r_backend GL3, alpha to coverage now requires GLSL 4.00 at a minimum
 
+fix: with r_lightmap 1 and r_dynamiclight 1, lighting transparent surfaces could crash
+
 fix: r_vertexLight 1 no longer applies to non-lightmapped surfaces
 
 fix: delayed shader loads could lead to incorrect rendering and crashes (mostly with dynamic lights)

code/renderer/tr_shader.cpp

@@ -2339,7 +2339,6 @@ static shader_t* FinishShader()
 			stages[0].mtStages = 0;
 			shader.lightingStages[ST_DIFFUSE] = 0; // for working dynamic lights
 			shader.lightingStages[ST_LIGHTMAP] = 0;
-			shader.numStages = 1;
 		}
 	} else if ( r_lightmap->integer ) {
 		// now we deal with r_lightmap on a non-opaque shader
@@ -2367,6 +2366,9 @@ static shader_t* FinishShader()
 				for ( int i = 2; i < shader.numStages; ++i ) {
 					stages[i].active = qfalse;
 				}
+
+				shader.lightingStages[ST_DIFFUSE] = 0; // for working dynamic lights
+				shader.lightingStages[ST_LIGHTMAP] = 0;
 			}
 		}
 	}

code/renderer/tr_world.cpp

@@ -345,7 +345,7 @@ static void R_AddLitSurface( msurface_t* surf, const dlight_t* light )
 		return; // already in the lit list (or already culled) for this light
 
 	const int stageIndex = surf->shader->lightingStages[ST_DIFFUSE];
-	if ( stageIndex < 0 )
+	if ( stageIndex < 0 || stageIndex >= surf->shader->numStages )
 		return;
 
 	const shaderStage_t* const stage = surf->shader->stages[stageIndex];