Show transparent back faces

git-svn-id: svn://cook.msm.cam.ac.uk:745/thrust3d/thrust3d@101 84d2e878-0bd5-11dd-ad15-13eda11d74c5

1 files changed, 4 insertions, 3 deletions

diff --git a/data/shaders/lighting.frag b/data/shaders/lighting.frag
index 4616feb..ef7ce18 100644
--- a/data/shaders/lighting.frag
+++ b/data/shaders/lighting.frag
@@ -20,6 +20,7 @@ uniform sampler2D texture;
 uniform bool fill_light_enabled;
 uniform bool texture_enabled;
 uniform bool texture_emits;
+uniform float alpha;
 
 varying vec3 col_ambi_diff;
 varying vec3 col_emit;
@@ -70,12 +71,12 @@ void main() {
 			gl_FragColor = vec4(min(emit.r + ambi.r + diff.r + spec.r + tex.r, 1.0),
 					    min(emit.g + ambi.g + diff.g + spec.g + tex.g, 1.0),
 					    min(emit.b + ambi.b + diff.b + spec.b + tex.b, 1.0),
-					    1.0);
+					    alpha);
 		} else {
 			gl_FragColor = vec4(tex.r * min(emit.r + ambi.r + diff.r + spec.r, 1.0),
 					    tex.g * min(emit.g + ambi.g + diff.g + spec.g, 1.0),
 					    tex.b * min(emit.b + ambi.b + diff.b + spec.b, 1.0),
-					    1.0);
+					    alpha);
 		}
 	
 	} else {
@@ -83,7 +84,7 @@ void main() {
 		gl_FragColor = vec4(min(emit.r + ambi.r + diff.r + spec.r, 1.0),
 				    min(emit.g + ambi.g + diff.g + spec.g, 1.0),
 				    min(emit.b + ambi.b + diff.b + spec.b, 1.0),
-				    1.0);
+				    alpha);
 
 	}