Add cast_shadow to lightArray data

This was done to undo the hardcoded nature of "receiveShadows", which
doesn't play nice when you have multiple lights of the same type and
one or several have cast_shadow set to false.

By simply "passing" the cast_shadow parameter within the lightArray it
was possible to detect lights that don't cast shadows before actually
wasting gpu cycles to render shadows with garbage data.

Support for deferred desktop and mobile, and forward was added.

Shaders/deferred_light/deferred_light.frag.glsl

@@ -94,7 +94,7 @@ uniform vec3 eye;
 uniform vec3 eyeLook;
 
 #ifdef _Clusters
-uniform vec4 lightsArray[maxLights * 2];
+uniform vec4 lightsArray[maxLights * 3];
 	#ifdef _Spot
 	uniform vec4 lightsArraySpot[maxLights];
 	#endif
@@ -456,18 +456,19 @@ void main() {
 			n,
 			v,
 			dotNV,
-			lightsArray[li * 2].xyz, // lp
-			lightsArray[li * 2 + 1].xyz, // lightCol
+			lightsArray[li * 3].xyz, // lp
+			lightsArray[li * 3 + 1].xyz, // lightCol
 			albedo,
 			roughness,
 			occspec.y,
 			f0
 			#ifdef _ShadowMap
-				, li, lightsArray[li * 2].w, true // bias
+				// light index, shadow bias, cast_shadows
+				, li, lightsArray[li * 3 + 2].x, lightsArray[li * 3 + 2].z != 0.0
 			#endif
 			#ifdef _Spot
-			, lightsArray[li * 2 + 1].w != 0.0
-			, lightsArray[li * 2 + 1].w // cutoff
+			, lightsArray[li * 3 + 2].y != 0.0
+			, lightsArray[li * 3 + 2].y // cutoff
 			, lightsArraySpot[li].w // cutoff - exponent
 			, lightsArraySpot[li].xyz // spotDir
 			#endif

Shaders/deferred_light_mobile/deferred_light.frag.glsl

@@ -34,7 +34,7 @@ uniform vec3 eye;
 uniform vec3 eyeLook;
 
 #ifdef _Clusters
-uniform vec4 lightsArray[maxLights * 2];
+uniform vec4 lightsArray[maxLights * 3];
 	#ifdef _Spot
 	uniform vec4 lightsArraySpot[maxLights];
 	#endif
@@ -255,18 +255,19 @@ void main() {
 			n,
 			v,
 			dotNV,
-			lightsArray[li * 2].xyz, // lp
-			lightsArray[li * 2 + 1].xyz, // lightCol
+			lightsArray[li * 3].xyz, // lp
+			lightsArray[li * 3 + 1].xyz, // lightCol
 			albedo,
 			roughness,
 			occspec.y,
 			f0
 			#ifdef _ShadowMap
-				, li, lightsArray[li * 2].w, true // bias
+				// light index, shadow bias, cast_shadows
+				, li, lightsArray[li * 3 + 2].x, lightsArray[li * 3 + 2].z != 0.0
 			#endif
 			#ifdef _Spot
-			, lightsArray[li * 2 + 1].w != 0.0
-			, lightsArray[li * 2 + 1].w // cutoff
+			, lightsArray[li * 3 + 2].y != 0.0
+			, lightsArray[li * 3 + 2].y // cutoff
 			, lightsArraySpot[li].w // cutoff - exponent
 			, lightsArraySpot[li].xyz // spotDir
 			#endif

Shaders/volumetric_light/volumetric_light.frag.glsl

@@ -12,7 +12,7 @@ uniform sampler2D gbufferD;
 uniform sampler2D snoise;
 
 #ifdef _Clusters
-uniform vec4 lightsArray[maxLights * 2];
+uniform vec4 lightsArray[maxLights * 3];
 	#ifdef _Spot
 	uniform vec4 lightsArraySpot[maxLights];
 	#endif

blender/arm/material/make_cluster.py

@@ -9,7 +9,7 @@ def write(vert, frag):
     frag.add_include_front('std/clusters.glsl')
     frag.add_uniform('vec2 cameraProj', link='_cameraPlaneProj')
     frag.add_uniform('vec2 cameraPlane', link='_cameraPlane')
-    frag.add_uniform('vec4 lightsArray[maxLights * 2]', link='_lightsArray')
+    frag.add_uniform('vec4 lightsArray[maxLights * 3]', link='_lightsArray')
     frag.add_uniform('sampler2D clustersData', link='_clustersData')
     if is_shadows:
         frag.add_uniform('bool receiveShadow')
@@ -56,19 +56,19 @@ def write(vert, frag):
     frag.write('    n,')
     frag.write('    vVec,')
     frag.write('    dotNV,')
-    frag.write('    lightsArray[li * 2].xyz,') # lp
-    frag.write('    lightsArray[li * 2 + 1].xyz,') # lightCol
+    frag.write('    lightsArray[li * 3].xyz,') # lp
+    frag.write('    lightsArray[li * 3 + 1].xyz,') # lightCol
     frag.write('    albedo,')
     frag.write('    roughness,')
     frag.write('    specular,')
     frag.write('    f0')
     if is_shadows:
-        frag.write('    , li, lightsArray[li * 2].w, receiveShadow') # bias
+        frag.write('\t, li, lightsArray[li * 3 + 2].x, lightsArray[li * 3 + 2].z != 0.0') # bias
     if '_Spot' in wrd.world_defs:
-        frag.write('    , lightsArray[li * 2 + 1].w != 0.0')
-        frag.write('    , lightsArray[li * 2 + 1].w') # cutoff
-        frag.write('    , lightsArraySpot[li].w') # cutoff - exponent
-        frag.write('    , lightsArraySpot[li].xyz') # spotDir
+        frag.write('\t, lightsArray[li * 3 + 2].y != 0.0')
+        frag.write('\t, lightsArray[li * 3 + 2].y') # cutoff
+        frag.write('\t, lightsArraySpot[li].w') # cutoff - exponent
+        frag.write('\t, lightsArraySpot[li].xyz') # spotDir
     if '_VoxelShadow' in wrd.world_defs and '_VoxelAOvar' in wrd.world_defs:
         frag.write('  , voxels, voxpos')
     frag.write(');')