Tile material: Add 'TILE_MATERIAL_OPAQUE', use for drawtype 'NDT_NORMAL'

Prevents normal drawtype nodes having transparency.
Avoids clients cheating by using 'x-ray' texture packs with transparent textures.

3 files changed, 35 insertions, 27 deletions

diff --git a/src/client/tile.h b/src/client/tile.h
index b4d615427..fb1c87371 100644
--- a/src/client/tile.h
+++ b/src/client/tile.h
@@ -156,7 +156,8 @@ enum MaterialType{
 	TILE_MATERIAL_LIQUID_TRANSPARENT,
 	TILE_MATERIAL_LIQUID_OPAQUE,
 	TILE_MATERIAL_WAVING_LEAVES,
-	TILE_MATERIAL_WAVING_PLANTS
+	TILE_MATERIAL_WAVING_PLANTS,
+	TILE_MATERIAL_OPAQUE
 };
 
 // Material flags
@@ -216,6 +217,10 @@ struct TileLayer
 	void applyMaterialOptions(video::SMaterial &material) const
 	{
 		switch (material_type) {
+		case TILE_MATERIAL_OPAQUE:
+		case TILE_MATERIAL_LIQUID_OPAQUE:
+			material.MaterialType = video::EMT_SOLID;
+			break;
 		case TILE_MATERIAL_BASIC:
 		case TILE_MATERIAL_WAVING_LEAVES:
 		case TILE_MATERIAL_WAVING_PLANTS:
@@ -225,9 +230,6 @@ struct TileLayer
 		case TILE_MATERIAL_LIQUID_TRANSPARENT:
 			material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 			break;
-		case TILE_MATERIAL_LIQUID_OPAQUE:
-			material.MaterialType = video::EMT_SOLID;
-			break;
 		}
 		material.BackfaceCulling = (material_flags & MATERIAL_FLAG_BACKFACE_CULLING)
 			? true : false;
diff --git a/src/nodedef.cpp b/src/nodedef.cpp
index 110393d63..6ccbc1557 100644
--- a/src/nodedef.cpp
+++ b/src/nodedef.cpp
@@ -690,6 +690,8 @@ void ContentFeatures::updateTextures(ITextureSource *tsrc, IShaderSource *shdsrc
 	switch (drawtype) {
 	default:
 	case NDT_NORMAL:
+		material_type = (alpha == 255) ?
+			TILE_MATERIAL_OPAQUE : TILE_MATERIAL_ALPHA;
 		solidness = 2;
 		break;
 	case NDT_AIRLIKE:
@@ -786,6 +788,16 @@ void ContentFeatures::updateTextures(ITextureSource *tsrc, IShaderSource *shdsrc
 		tile_shader[j] = shdsrc->getShader("nodes_shader",
 			material_type, drawtype);
 	}
+	u8 overlay_material = material_type;
+	if (overlay_material == TILE_MATERIAL_OPAQUE)
+		overlay_material = TILE_MATERIAL_BASIC;
+	else if (overlay_material == TILE_MATERIAL_LIQUID_OPAQUE)
+		overlay_material = TILE_MATERIAL_LIQUID_TRANSPARENT;
+	u32 overlay_shader[6];
+	for (u16 j = 0; j < 6; j++) {
+		overlay_shader[j] = shdsrc->getShader("nodes_shader",
+			overlay_material, drawtype);
+	}
 
 	// Tiles (fill in f->tiles[])
 	for (u16 j = 0; j < 6; j++) {
@@ -794,8 +806,8 @@ void ContentFeatures::updateTextures(ITextureSource *tsrc, IShaderSource *shdsrc
 			tdef[j].backface_culling, material_type);
 		if (tdef_overlay[j].name != "")
 			fillTileAttribs(tsrc, &tiles[j].layers[1], &tdef_overlay[j],
-				tile_shader[j], tsettings.use_normal_texture,
-				tdef[j].backface_culling, material_type);
+				overlay_shader[j], tsettings.use_normal_texture,
+				tdef[j].backface_culling, overlay_material);
 	}
 
 	// Special tiles (fill in f->special_tiles[])
diff --git a/src/shader.cpp b/src/shader.cpp
index 6e89d75ad..4f482fddb 100644
--- a/src/shader.cpp
+++ b/src/shader.cpp
@@ -531,26 +531,19 @@ ShaderInfo generate_shader(const std::string &name, u8 material_type, u8 drawtyp
 	shaderinfo.drawtype = drawtype;
 	shaderinfo.material = video::EMT_SOLID;
 	switch (material_type) {
-		case TILE_MATERIAL_BASIC:
-			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
-			break;
-		case TILE_MATERIAL_ALPHA:
-			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
-			break;
-		case TILE_MATERIAL_LIQUID_TRANSPARENT:
-			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
-			break;
-		case TILE_MATERIAL_LIQUID_OPAQUE:
-			shaderinfo.base_material = video::EMT_SOLID;
-			break;
-		case TILE_MATERIAL_WAVING_LEAVES:
-			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
-			break;
-		case TILE_MATERIAL_WAVING_PLANTS:
-			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
-			break;
-		default:
-			break;
+	case TILE_MATERIAL_OPAQUE:
+	case TILE_MATERIAL_LIQUID_OPAQUE:
+		shaderinfo.base_material = video::EMT_SOLID;
+		break;
+	case TILE_MATERIAL_ALPHA:
+	case TILE_MATERIAL_LIQUID_TRANSPARENT:
+		shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+		break;
+	case TILE_MATERIAL_BASIC:
+	case TILE_MATERIAL_WAVING_LEAVES:
+	case TILE_MATERIAL_WAVING_PLANTS:
+		shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
+		break;
 	}
 
 	bool enable_shaders = g_settings->getBool("enable_shaders");
@@ -642,7 +635,8 @@ ShaderInfo generate_shader(const std::string &name, u8 material_type, u8 drawtyp
 		"TILE_MATERIAL_LIQUID_TRANSPARENT",
 		"TILE_MATERIAL_LIQUID_OPAQUE",
 		"TILE_MATERIAL_WAVING_LEAVES",
-		"TILE_MATERIAL_WAVING_PLANTS"
+		"TILE_MATERIAL_WAVING_PLANTS",
+		"TILE_MATERIAL_OPAQUE"
 	};
 
 	for (int i = 0; i < 6; i++){