glTF: Fix export crash with a ShaderMaterial (fixes #70159)

1 files changed, 161 insertions, 155 deletions

diff --git a/modules/gltf/gltf_document.cpp b/modules/gltf/gltf_document.cpp
index f4db576b0c..d858f76b28 100644
--- a/modules/gltf/gltf_document.cpp
+++ b/modules/gltf/gltf_document.cpp
@@ -3384,177 +3384,179 @@ Error GLTFDocument::_serialize_materials(Ref<GLTFState> p_state) {
 		if (!material->get_name().is_empty()) {
 			d["name"] = _gen_unique_name(p_state, material->get_name());
 		}
+
 		Ref<BaseMaterial3D> base_material = material;
-		if (base_material.is_valid()) {
-			Dictionary mr;
-			{
-				Array arr;
-				const Color c = base_material->get_albedo().srgb_to_linear();
-				arr.push_back(c.r);
-				arr.push_back(c.g);
-				arr.push_back(c.b);
-				arr.push_back(c.a);
-				mr["baseColorFactor"] = arr;
+		if (base_material.is_null()) {
+			materials.push_back(d);
+			continue;
+		}
+
+		Dictionary mr;
+		{
+			Array arr;
+			const Color c = base_material->get_albedo().srgb_to_linear();
+			arr.push_back(c.r);
+			arr.push_back(c.g);
+			arr.push_back(c.b);
+			arr.push_back(c.a);
+			mr["baseColorFactor"] = arr;
+		}
+		{
+			Dictionary bct;
+			Ref<Texture2D> albedo_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_ALBEDO);
+			GLTFTextureIndex gltf_texture_index = -1;
+
+			if (albedo_texture.is_valid() && albedo_texture->get_image().is_valid()) {
+				albedo_texture->set_name(material->get_name() + "_albedo");
+				gltf_texture_index = _set_texture(p_state, albedo_texture, base_material->get_texture_filter(), base_material->get_flag(BaseMaterial3D::FLAG_USE_TEXTURE_REPEAT));
 			}
-			{
-				Dictionary bct;
-				if (base_material.is_valid()) {
-					Ref<Texture2D> albedo_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_ALBEDO);
-					GLTFTextureIndex gltf_texture_index = -1;
-
-					if (albedo_texture.is_valid() && albedo_texture->get_image().is_valid()) {
-						albedo_texture->set_name(material->get_name() + "_albedo");
-						gltf_texture_index = _set_texture(p_state, albedo_texture, base_material->get_texture_filter(), base_material->get_flag(BaseMaterial3D::FLAG_USE_TEXTURE_REPEAT));
-					}
-					if (gltf_texture_index != -1) {
-						bct["index"] = gltf_texture_index;
-						Dictionary extensions = _serialize_texture_transform_uv1(material);
-						if (!extensions.is_empty()) {
-							bct["extensions"] = extensions;
-							p_state->use_khr_texture_transform = true;
-						}
-						mr["baseColorTexture"] = bct;
-					}
+			if (gltf_texture_index != -1) {
+				bct["index"] = gltf_texture_index;
+				Dictionary extensions = _serialize_texture_transform_uv1(material);
+				if (!extensions.is_empty()) {
+					bct["extensions"] = extensions;
+					p_state->use_khr_texture_transform = true;
+				}
+				mr["baseColorTexture"] = bct;
+			}
+		}
+
+		mr["metallicFactor"] = base_material->get_metallic();
+		mr["roughnessFactor"] = base_material->get_roughness();
+		bool has_roughness = base_material->get_texture(BaseMaterial3D::TEXTURE_ROUGHNESS).is_valid() && base_material->get_texture(BaseMaterial3D::TEXTURE_ROUGHNESS)->get_image().is_valid();
+		bool has_ao = base_material->get_feature(BaseMaterial3D::FEATURE_AMBIENT_OCCLUSION) && base_material->get_texture(BaseMaterial3D::TEXTURE_AMBIENT_OCCLUSION).is_valid();
+		bool has_metalness = base_material->get_texture(BaseMaterial3D::TEXTURE_METALLIC).is_valid() && base_material->get_texture(BaseMaterial3D::TEXTURE_METALLIC)->get_image().is_valid();
+		if (has_ao || has_roughness || has_metalness) {
+			Dictionary mrt;
+			Ref<Texture2D> roughness_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_ROUGHNESS);
+			BaseMaterial3D::TextureChannel roughness_channel = base_material->get_roughness_texture_channel();
+			Ref<Texture2D> metallic_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_METALLIC);
+			BaseMaterial3D::TextureChannel metalness_channel = base_material->get_metallic_texture_channel();
+			Ref<Texture2D> ao_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_AMBIENT_OCCLUSION);
+			BaseMaterial3D::TextureChannel ao_channel = base_material->get_ao_texture_channel();
+			Ref<ImageTexture> orm_texture;
+			orm_texture.instantiate();
+			Ref<Image> orm_image;
+			orm_image.instantiate();
+			int32_t height = 0;
+			int32_t width = 0;
+			Ref<Image> ao_image;
+			if (has_ao) {
+				height = ao_texture->get_height();
+				width = ao_texture->get_width();
+				ao_image = ao_texture->get_image();
+				Ref<ImageTexture> img_tex = ao_image;
+				if (img_tex.is_valid()) {
+					ao_image = img_tex->get_image();
+				}
+				if (ao_image->is_compressed()) {
+					ao_image->decompress();
+				}
+			}
+			Ref<Image> roughness_image;
+			if (has_roughness) {
+				height = roughness_texture->get_height();
+				width = roughness_texture->get_width();
+				roughness_image = roughness_texture->get_image();
+				Ref<ImageTexture> img_tex = roughness_image;
+				if (img_tex.is_valid()) {
+					roughness_image = img_tex->get_image();
+				}
+				if (roughness_image->is_compressed()) {
+					roughness_image->decompress();
 				}
 			}
-			if (base_material.is_valid()) {
-				mr["metallicFactor"] = base_material->get_metallic();
-				mr["roughnessFactor"] = base_material->get_roughness();
-				bool has_roughness = base_material->get_texture(BaseMaterial3D::TEXTURE_ROUGHNESS).is_valid() && base_material->get_texture(BaseMaterial3D::TEXTURE_ROUGHNESS)->get_image().is_valid();
-				bool has_ao = base_material->get_feature(BaseMaterial3D::FEATURE_AMBIENT_OCCLUSION) && base_material->get_texture(BaseMaterial3D::TEXTURE_AMBIENT_OCCLUSION).is_valid();
-				bool has_metalness = base_material->get_texture(BaseMaterial3D::TEXTURE_METALLIC).is_valid() && base_material->get_texture(BaseMaterial3D::TEXTURE_METALLIC)->get_image().is_valid();
-				if (has_ao || has_roughness || has_metalness) {
-					Dictionary mrt;
-					Ref<Texture2D> roughness_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_ROUGHNESS);
-					BaseMaterial3D::TextureChannel roughness_channel = base_material->get_roughness_texture_channel();
-					Ref<Texture2D> metallic_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_METALLIC);
-					BaseMaterial3D::TextureChannel metalness_channel = base_material->get_metallic_texture_channel();
-					Ref<Texture2D> ao_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_AMBIENT_OCCLUSION);
-					BaseMaterial3D::TextureChannel ao_channel = base_material->get_ao_texture_channel();
-					Ref<ImageTexture> orm_texture;
-					orm_texture.instantiate();
-					Ref<Image> orm_image;
-					orm_image.instantiate();
-					int32_t height = 0;
-					int32_t width = 0;
-					Ref<Image> ao_image;
+			Ref<Image> metallness_image;
+			if (has_metalness) {
+				height = metallic_texture->get_height();
+				width = metallic_texture->get_width();
+				metallness_image = metallic_texture->get_image();
+				Ref<ImageTexture> img_tex = metallness_image;
+				if (img_tex.is_valid()) {
+					metallness_image = img_tex->get_image();
+				}
+				if (metallness_image->is_compressed()) {
+					metallness_image->decompress();
+				}
+			}
+			Ref<Texture2D> albedo_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_ALBEDO);
+			if (albedo_texture.is_valid() && albedo_texture->get_image().is_valid()) {
+				height = albedo_texture->get_height();
+				width = albedo_texture->get_width();
+			}
+			orm_image->initialize_data(width, height, false, Image::FORMAT_RGBA8);
+			if (ao_image.is_valid() && ao_image->get_size() != Vector2(width, height)) {
+				ao_image->resize(width, height, Image::INTERPOLATE_LANCZOS);
+			}
+			if (roughness_image.is_valid() && roughness_image->get_size() != Vector2(width, height)) {
+				roughness_image->resize(width, height, Image::INTERPOLATE_LANCZOS);
+			}
+			if (metallness_image.is_valid() && metallness_image->get_size() != Vector2(width, height)) {
+				metallness_image->resize(width, height, Image::INTERPOLATE_LANCZOS);
+			}
+			for (int32_t h = 0; h < height; h++) {
+				for (int32_t w = 0; w < width; w++) {
+					Color c = Color(1.0f, 1.0f, 1.0f);
 					if (has_ao) {
-						height = ao_texture->get_height();
-						width = ao_texture->get_width();
-						ao_image = ao_texture->get_image();
-						Ref<ImageTexture> img_tex = ao_image;
-						if (img_tex.is_valid()) {
-							ao_image = img_tex->get_image();
-						}
-						if (ao_image->is_compressed()) {
-							ao_image->decompress();
+						if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_RED == ao_channel) {
+							c.r = ao_image->get_pixel(w, h).r;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_GREEN == ao_channel) {
+							c.r = ao_image->get_pixel(w, h).g;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_BLUE == ao_channel) {
+							c.r = ao_image->get_pixel(w, h).b;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_ALPHA == ao_channel) {
+							c.r = ao_image->get_pixel(w, h).a;
 						}
 					}
-					Ref<Image> roughness_image;
 					if (has_roughness) {
-						height = roughness_texture->get_height();
-						width = roughness_texture->get_width();
-						roughness_image = roughness_texture->get_image();
-						Ref<ImageTexture> img_tex = roughness_image;
-						if (img_tex.is_valid()) {
-							roughness_image = img_tex->get_image();
-						}
-						if (roughness_image->is_compressed()) {
-							roughness_image->decompress();
+						if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_RED == roughness_channel) {
+							c.g = roughness_image->get_pixel(w, h).r;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_GREEN == roughness_channel) {
+							c.g = roughness_image->get_pixel(w, h).g;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_BLUE == roughness_channel) {
+							c.g = roughness_image->get_pixel(w, h).b;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_ALPHA == roughness_channel) {
+							c.g = roughness_image->get_pixel(w, h).a;
 						}
 					}
-					Ref<Image> metallness_image;
 					if (has_metalness) {
-						height = metallic_texture->get_height();
-						width = metallic_texture->get_width();
-						metallness_image = metallic_texture->get_image();
-						Ref<ImageTexture> img_tex = metallness_image;
-						if (img_tex.is_valid()) {
-							metallness_image = img_tex->get_image();
-						}
-						if (metallness_image->is_compressed()) {
-							metallness_image->decompress();
-						}
-					}
-					Ref<Texture2D> albedo_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_ALBEDO);
-					if (albedo_texture.is_valid() && albedo_texture->get_image().is_valid()) {
-						height = albedo_texture->get_height();
-						width = albedo_texture->get_width();
-					}
-					orm_image->initialize_data(width, height, false, Image::FORMAT_RGBA8);
-					if (ao_image.is_valid() && ao_image->get_size() != Vector2(width, height)) {
-						ao_image->resize(width, height, Image::INTERPOLATE_LANCZOS);
-					}
-					if (roughness_image.is_valid() && roughness_image->get_size() != Vector2(width, height)) {
-						roughness_image->resize(width, height, Image::INTERPOLATE_LANCZOS);
-					}
-					if (metallness_image.is_valid() && metallness_image->get_size() != Vector2(width, height)) {
-						metallness_image->resize(width, height, Image::INTERPOLATE_LANCZOS);
-					}
-					for (int32_t h = 0; h < height; h++) {
-						for (int32_t w = 0; w < width; w++) {
-							Color c = Color(1.0f, 1.0f, 1.0f);
-							if (has_ao) {
-								if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_RED == ao_channel) {
-									c.r = ao_image->get_pixel(w, h).r;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_GREEN == ao_channel) {
-									c.r = ao_image->get_pixel(w, h).g;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_BLUE == ao_channel) {
-									c.r = ao_image->get_pixel(w, h).b;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_ALPHA == ao_channel) {
-									c.r = ao_image->get_pixel(w, h).a;
-								}
-							}
-							if (has_roughness) {
-								if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_RED == roughness_channel) {
-									c.g = roughness_image->get_pixel(w, h).r;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_GREEN == roughness_channel) {
-									c.g = roughness_image->get_pixel(w, h).g;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_BLUE == roughness_channel) {
-									c.g = roughness_image->get_pixel(w, h).b;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_ALPHA == roughness_channel) {
-									c.g = roughness_image->get_pixel(w, h).a;
-								}
-							}
-							if (has_metalness) {
-								if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_RED == metalness_channel) {
-									c.b = metallness_image->get_pixel(w, h).r;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_GREEN == metalness_channel) {
-									c.b = metallness_image->get_pixel(w, h).g;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_BLUE == metalness_channel) {
-									c.b = metallness_image->get_pixel(w, h).b;
-								} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_ALPHA == metalness_channel) {
-									c.b = metallness_image->get_pixel(w, h).a;
-								}
-							}
-							orm_image->set_pixel(w, h, c);
-						}
-					}
-					orm_image->generate_mipmaps();
-					orm_texture->set_image(orm_image);
-					GLTFTextureIndex orm_texture_index = -1;
-					if (has_ao || has_roughness || has_metalness) {
-						orm_texture->set_name(material->get_name() + "_orm");
-						orm_texture_index = _set_texture(p_state, orm_texture, base_material->get_texture_filter(), base_material->get_flag(BaseMaterial3D::FLAG_USE_TEXTURE_REPEAT));
-					}
-					if (has_ao) {
-						Dictionary occt;
-						occt["index"] = orm_texture_index;
-						d["occlusionTexture"] = occt;
-					}
-					if (has_roughness || has_metalness) {
-						mrt["index"] = orm_texture_index;
-						Dictionary extensions = _serialize_texture_transform_uv1(material);
-						if (!extensions.is_empty()) {
-							mrt["extensions"] = extensions;
-							p_state->use_khr_texture_transform = true;
+						if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_RED == metalness_channel) {
+							c.b = metallness_image->get_pixel(w, h).r;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_GREEN == metalness_channel) {
+							c.b = metallness_image->get_pixel(w, h).g;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_BLUE == metalness_channel) {
+							c.b = metallness_image->get_pixel(w, h).b;
+						} else if (BaseMaterial3D::TextureChannel::TEXTURE_CHANNEL_ALPHA == metalness_channel) {
+							c.b = metallness_image->get_pixel(w, h).a;
 						}
-						mr["metallicRoughnessTexture"] = mrt;
 					}
+					orm_image->set_pixel(w, h, c);
 				}
 			}
-			d["pbrMetallicRoughness"] = mr;
+			orm_image->generate_mipmaps();
+			orm_texture->set_image(orm_image);
+			GLTFTextureIndex orm_texture_index = -1;
+			if (has_ao || has_roughness || has_metalness) {
+				orm_texture->set_name(material->get_name() + "_orm");
+				orm_texture_index = _set_texture(p_state, orm_texture, base_material->get_texture_filter(), base_material->get_flag(BaseMaterial3D::FLAG_USE_TEXTURE_REPEAT));
+			}
+			if (has_ao) {
+				Dictionary occt;
+				occt["index"] = orm_texture_index;
+				d["occlusionTexture"] = occt;
+			}
+			if (has_roughness || has_metalness) {
+				mrt["index"] = orm_texture_index;
+				Dictionary extensions = _serialize_texture_transform_uv1(material);
+				if (!extensions.is_empty()) {
+					mrt["extensions"] = extensions;
+					p_state->use_khr_texture_transform = true;
+				}
+				mr["metallicRoughnessTexture"] = mrt;
+			}
 		}
+
+		d["pbrMetallicRoughness"] = mr;
 		if (base_material->get_feature(BaseMaterial3D::FEATURE_NORMAL_MAPPING)) {
 			Dictionary nt;
 			Ref<ImageTexture> tex;
@@ -3607,6 +3609,7 @@ Error GLTFDocument::_serialize_materials(Ref<GLTFState> p_state) {
 			arr.push_back(c.b);
 			d["emissiveFactor"] = arr;
 		}
+
 		if (base_material->get_feature(BaseMaterial3D::FEATURE_EMISSION)) {
 			Dictionary et;
 			Ref<Texture2D> emission_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_EMISSION);
@@ -3621,16 +3624,19 @@ Error GLTFDocument::_serialize_materials(Ref<GLTFState> p_state) {
 				d["emissiveTexture"] = et;
 			}
 		}
+
 		const bool ds = base_material->get_cull_mode() == BaseMaterial3D::CULL_DISABLED;
 		if (ds) {
 			d["doubleSided"] = ds;
 		}
+
 		if (base_material->get_transparency() == BaseMaterial3D::TRANSPARENCY_ALPHA_SCISSOR) {
 			d["alphaMode"] = "MASK";
 			d["alphaCutoff"] = base_material->get_alpha_scissor_threshold();
 		} else if (base_material->get_transparency() != BaseMaterial3D::TRANSPARENCY_DISABLED) {
 			d["alphaMode"] = "BLEND";
 		}
+
 		materials.push_back(d);
 	}
 	if (!materials.size()) {